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Digital Camera Patent Abstract
A digital camera includes an image capturing unit, an image capturing
control unit, and an image processing unit. The image capturing
control unit controls the image capturing unit so as to obtain a
still image. The image processing unit creates freeze video data
used for reproducing the still image for a predetermined period
of time.
Digital Camera Patent Claims
1. A digital camera comprising: an image capturing unit which captures
an image of a photographic subject; an image capturing control unit
which controls said image capturing unit to obtain a still image;
and an image processing unit which creates freeze video data used
for reproducing said still image for a predetermined period of time.
2. The digital camera according to claim 1, wherein said image
processing unit creates, in a data format compliant with a predetermined
video file specification, said freeze video data for reproducing
said still image for the predetermined period of time.
3. The digital camera according to claim 1, further comprising:
a sound collecting unit which collects a sound to create sound data;
and a sound processing unit which acquires, from said sound collecting
unit, sound data during a period of time including a point of time
when said still image is captured, and then adds said sound data
to said freeze video data so that said sound data is reproducible
in synchronization with said freeze video data.
4. The digital camera according to claim 1, wherein: said image
capturing control unit controls said image capturing unit to create
video data before said still image is captured: and said image processing
unit creates a video file in which said video data and said freeze
video data are connected in a reproduction order.
5. The digital camera according to claim 1, wherein: said image
capturing control unit controls said image capturing unit to create
video data after said still image is captured; and said image processing
unit creates a video file in which said video data and said freeze
video data are connected in a reproduction order.
6. The digital camera according to claim 4, further comprising:
a sound effect processing unit which adds predetermined sound effect
data to said video file such that said predetermined sound effect
data is reproducible in synchronization with a time when freeze
video data reproduction and video data reproduction are switched.
7. The digital camera according to claim 4, further comprising:
an effective image processing unit which adds to said video file
a predetermined effective image to be inserted when freeze video
data reproduction and video data reproduction are switched, the
predetermined effective image being to effectively show that the
switching between the freeze video data reproduction and the video
data reproduction is done.
8. The digital camera according to claim 4, wherein: said image
capturing control unit creates said video data by reading pixels
with a low resolution from said image capturing unit; and said image
capturing control unit converts a resolution of said still image
obtained through a high resolution reading from said image capturing
unit, so as to create said freeze video data whose number of pixels
matches with that of said video data.
9. The digital camera according to claim 4, wherein said image
capturing control unit increases, by a pixel interpolation, the
number of pixels of said video data which is read with a low resolution
from said image capturing unit; and said image capturing control
unit converts a resolution of said still image obtained through
high resolution reading from said image capturing unit, so as to
create said freeze video data whose number of pixels matches with
that of said video data.
10. The digital camera according to claim 1, further comprising:
a position determination unit which determines in which shooting
position, vertical or horizontal, an image is shot and a rotational
conversion unit which rotationally converts said still image according
to the shooting position, wherein said image processing unit stores
the rotationally converted still image in a video frame, thereby
creating freeze video data used for reproducing the rotationally
converted still image for a predetermined period of time.
11. The digital camera according to claim 10, wherein when rotationally
converting said still image, said rotational conversion unit converts
the resolution of said still image such that the number of pixels
of said still image on a long side of a frame is smaller than that
on a short side thereof.
12. The digital camera according to claim 10, wherein when rotationally
converting said still image, said rotational conversion unit adds
a predetermined image for aspect adjustment outside a frame of the
rotationally converted still image so as to maintain an aspect ratio
before the rotational conversion.
13. The digital camera according to claim 1, wherein said image
processing unit connects a plurality of pieces of freeze video data
to create a video file usable for an automatic slide reproduction.
14. The digital camera according to claim 13, wherein said image
processing unit creates, from said still image, an image to be displayed
for one of options to reproduce, and stores the created image in
said video file for a chapter menu.
15. The digital camera according to claim 13, wherein said image
processing unit creates, from a still image with a shooting date
different from that of an immediately preceding still image, an
image to be displayed for one of options to reproduce, and stores
the created image in said video file for a chapter menu.
16. The digital camera according to claim 13, wherein when said
plurality of pieces of freeze video data to connect have different
shooting dates, said image processing unit inserts a shooting date
to a portion at which the dates of the free video data change at
reproduction.
17. The digital camera according to claim 13, wherein said image
processing unit stores, in said video file, identification information
specifying the still image file from which the image to be displayed
is created.
18. A digital camera capable of shooting a video and a still image,
comprising: a first control unit which starts buffering a video
upon an input of a first start signal, and releases the video being
buffered without storing it upon a cancellation of said first start
signal; and a second control unit which shoots and stores a still
image upon an input of a second start signal, and stores video being
buffered in synchronization with said second start signal.
19. The digital camera according to claim 18, further comprising
a release operating member which has a two-step switch of a half
press and a full press, outputs said first start signal in response
to the half press and cancels said first start signal in response
to a release of the half press, and outputs said second start signal
in response to the full press, wherein: said first control unit
starts buffering a video in response to the half press and releases
the video being buffered without storing it in response to a release
of the half press; and said second control unit shoots and stores
a still image in response to the full press and stores the video
being buffered in synchronization with the full press.
20. The digital camera according to claim 18, further comprising
a framing determination unit which outputs said first start signal
when detecting that a framing of the digital camera is in a stable
state and cancels said first start signal when detecting that the
framing thereof is in an unstable state, wherein said first control
unit starts buffering a video in response to a detection that the
framing is in a stable state, and releases the video being buffered
without storing it in response to a detection that the framing is
in an unstable state.
21. The digital camera according to claim 18, further comprising
a self-timer unit which outputs said first start signal in response
to a start of a self-timer, cancels said first start signal in response
to a cancellation of said self-timer, and outputs said second start
signal in response to a time elapse of said self-timer, wherein:
said first control unit starts buffering a video in response to
a start of said self-timer and releases the video being buffered
without storing it in response to a cancellation of said self-timer;
and said second control unit shoots and stores a still image in
response to the time elapse of said self-timer and stores the video
being buffered in synchronization with the time elapse.
22. The digital camera according to claim 18, further comprising
a period determination unit which determines a transition period
of time according to a threshold value, and does not store said
video when the transition period of time is less than the threshold
value, the transition period of time being a time from an input
of said first start signal to an input of said second start signal.
23. The digital camera according to claim 18, further comprising
a brightness determination unit which evaluates brightness of said
video and does not store said video when evaluating the brightness
of said video to be dark.
24. The digital camera according to claim 23, wherein the brightness
determination unit stores not said video but a sound portion thereof
when evaluating the brightness of said video to be dark.
25. The digital camera according to claim 18, further comprising
a freeze video creating unit which creates freeze video used for
reproducing a still image for a predetermined period of time, wherein
said second control unit stores a video file in which said video
and said freeze video are connected in reproduction order.
26. The digital camera according to claim 18, further comprising
a shooting preparation unit which performs a shooting preparation
of an automatic exposure control and/or an automatic focusing control,
wherein said first control unit performs the shooting preparation
in response to an input of said and starts buffering said video
after the shooting preparation.
Digital Camera Patent Description
CROSS REFERENCE TO RELATED APPLICATION
[0001] This application is based upon and claims the benefit of
priority from Japanese Patent Application Nos. 2004-351267, 2004-351268,
2004-351269, and 2004-351270, all filed on Dec. 3, 2004, the entire
contents of which are incorporated herein by reference.
BACKGROUND OF THE INVENTION
[0002] 1. Field of the Invention
[0003] The present invention relates to a digital camera having
video file creating function.
[0004] 2. Description of the Related Art
[0005] With a widespread use of a digital camera in recent years,
a still image file is easily creatable. Such a still image file
can be reproduced and displayed on a computer by using a viewer
program. Also, video-software-dedicated reproduction devices such
as a DVD player have recently come into wide use at home, so that
the a large number of people can enjoy video software easily on
a television at home.
[0006] However, such video reproduction devices specialize in a
video software reproduction, and many of them do not have a function
of reproducing a still image file. For this reason, it has been
difficult to easily reproduce a still image file created in the
digital camera and view the still image on the home television.
[0007] Japanese Unexamined Patent Application Publication No. 2002-300445
discloses a digital camera in which a video shooting operation and
a still image shooting operation can be easily switched over. That
is, the digital camera disclosed therein starts shooting the video
upon half press to a release button. The digital camera stops shooting
the video in response to a release from the half press of the release
button and then stores a video file in a recording medium. On the
other hand, upon a change from the half pressing to a full pressing,
the digital camera stops shooting the video and simultaneously starts
shooting the still image. At this time, in the digital camera, both
of a video file and a still image file are created and stored in
the recording medium. A link file between both the files is also
stored in the recording medium. The digital camera disclosed in
the document analyzes data of the link file by using a dedicated
reproduction device, and reproduce related video and still image
files sequentially. However, a general-purpose reproduction device
does not have a function of analyzing the data of the link file
disclosed in the document. Therefore, the still image files created
by the digital camera disclosed in the document cannot be reproduced
by the widespread household video reproduction device.
[0008] Further, the digital camera disclosed in Japanese Unexamined
Patent Application Publication No. 2002-300445 has operational problems.
In general, before starting shooting the still image, a user often
presses the release button halfway several times repeatedly for
composition adjustment or focus adjustment. Upon every half press
operation, the video file is stored in the digital camera. In other
words, many unwanted video files for the user may be stored therein.
In addition, if the release button is fully pressed at once, a momentary
half press state may occur, which may cause generation and storage
of very short, useless video files. Further, the user tends to pan
a camera for the composition adjustment while halfway pressing the
release button. During the panning, the screen moves largely, so
that the screen blurs a lot. This may cause storage of undesirable
video files.
[0009] Furthermore, there is a known technique for reproducing
a video file shot in a vertical position disclosed in Japanese Unexamined
Patent Application Publication No. 2004-248171. According to this
document, at the video reproduction, the video is rotated to the
vertical position for display. As described therein, a conventional
digital camera records the video which is shot in the vertical position
without rotating the image.
SUMMARY OF 7HE INVENTION
[0010] Hereinafter, the invention will be described.
[0011] (1) A digital camera according to an aspect of the invention
includes an image capturing unit, an image capturing control unit,
and an image processing unit. The image capturing unit captures
an image of a photographic subject. The image capturing control
unit controls the image capturing unit to obtain a still image.
The image processing unit creates freeze video data used for reproducing
the still image for a predetermined period of time.
[0012] (2) According to the invention, preferably, the image processing
unit creates the freeze video data used for reproducing the still
image for the predetermined period of time, in a data format compliant
with a predetermined video file specification.
[0013] (3) According to the invention, preferably, the digital
camera further includes a sound collecting unit and a sound processing
unit. The sound collecting unit collects a sound to create sound
data. The sound processing unit acquires, from the sound collecting
unit, sound data during a period of time including a point of time
when the still image is captured, and then adds the sound data to
the freeze video data so that the sound data is reproducible in
synchronization with the freeze video data.
[0014] (4) Furthermore, preferably, the image capturing control
unit controls the image capturing unit to create video data before
the still image is captured. The image processing unit creates a
video file in which the video data and the freeze video data are
connected in reproduction order.
[0015] (5) Furthermore, according to the invention, preferably,
the image capturing control unit controls the image capturing unit
to create video data after the still image is captured. The image
processing unit creates a video file in which the video data and
the freeze video data are connected in reproduction order.
[0016] (6) Furthermore, according to the invention, preferably,
the digital camera further includes a sound effect processing unit.
The sound effect processing unit adds predetermined sound effect
data to the video file such that the predetermined sound effect
data is reproducible in synchronization with a time when freeze
video data reproduction and video data reproduction are switched.
[0017] (7) Preferably, the digital camera further includes an effective
image processing unit. The effective image processing unit adds
to the video file a predetermined effective image to be inserted
when the freeze video data reproduction and the video data reproduction
are switched. The predetermined effective image effectively shows
that the switching between the free video data reproduction and
the video data reproduction is done.
[0018] (8) Furthermore, preferably, the image capturing control
unit creates the video data by reading pixels with a low resolution
from the image capturing unit. Also, the image capturing control
unit converts a resolution of the still image obtained through a
high resolution reading from the image capturing unit, so as to
create the freeze video data whose number of pixels match with that
of the video data.
[0019] (9) Furthermore, preferably, the image capturing control
unit increases, by a pixel interpolation, the number of pixels of
the video data which is read with a low resolution from the image
capturing unit. In addition, the image capturing control unit converts
a resolution of the still image obtained through a high resolution
reading from the image capturing unit, so as to create the freeze
video data whose number of pixels matches with that of the video
data.
[0020] (10) Furthermore, preferably, the digital camera further
includes a position determination unit and a rotational conversion
unit. The position determination unit determines in which shooting
position, vertical or horizontal, an image is shot. The rotational
conversion unit rotationally converts the still image according
to the shooting position. The image processing unit stores the rotationally
converted still image in a video frame, thereby creating freeze
video data used for reproducing the rotationally converted still
image for a predetermined period of time.
[0021] (11) Furthermore, preferably, when rotationally converting
the still image, the rotational conversion unit converts the resolution
of the still image such that the number of pixels of the still image
on a long side of a frame is smaller than that of the still image
on a short side thereof.
[0022] (12) Furthermore, preferably, when rotationally converting
the still image, the rotational conversion unit adds a predetermined
image for aspect adjustment outside a frame of the rotationally
converted still image so as to maintain an aspect ratio before the
rotational conversion.
[0023] (13) Furthermore, preferably, the image processing unit
connects a plurality of pieces of freeze video data to create a
video file which is usable for an automatic slide reproduction.
[0024] (14) Furthermore, preferably, the image processing unit
creates from a still image an image to be displayed for one of options
to reproduce, and stores the created image in the video file for
a chapter menu.
[0025] (15) Furthermore, preferably, the image processing unit
creates, from a still image with a different shooting date from
that of an immediately preceding still image, an image to be displayed
for one of options to reproduce, and stores the created image in
the video file for a chapter menu.
[0026] (16) Furthermore, preferably, when the plurality of pieces
of freeze video data to connect have different shooting dates, the
image processing unit inserts a shooting date to a portion at which
the dates of the freeze video data change at reproduction.
[0027] (17) Furthermore, preferably, the image processing unit
stores in the video file identification information specifying a
still image file from which the image to be displayed is created.
[0028] (18) A second digital camera according to another aspect
of the invention is capable of shooting both a video and a still
image and includes a first control unit and a second control unit.
The first control unit starts buffering a video upon an input of
a first start signal, and releases the video being buffered without
storing it upon the cancellation of the first start signal. The
second control unit shoots and stores a still image upon an input
of a second start signal, and stores the video being buffered in
synchronization with the second start signal.
[0029] (19) Further, preferably, the second digital camera further
includes a release operating member. The release operating member
has two-step switch of a half press and a full press. In addition,
the release operating member outputs the first start signal in response
to the half press and cancels the first start signal in response
to a release of the half press. Moreover, the release operating
member outputs the second start signal in response to the full press.
The first control unit starts buffering a video in response to the
half press and releases the video being buffered without storing
it in response to a release of the half press. The second control
unit shoots and stores a still image in response to the full press
and stores the video being buffered in synchronization with the
full press.
[0030] (20) Furthermore, preferably, the second digital camera
further includes a framing determination unit. The framing determination
unit outputs the first start signal when detecting that a framing
of the digital camera-is in a stable state. In addition, the framing
determination unit cancels the first start signal when detecting
that the framing thereof is in an unstable state. On the other hand,
the first control unit starts buffering a video in response to a
detection that the framing is in the stable state and releases the
video being buffered without storing it when detecting that the
framing is in the unstable state.
[0031] (21) Furthermore, preferably, the second digital camera
further includes a self-timer unit. The self-timer unit outputs
the first start signal in response to a start of a self-timer and
cancels the first start signal in response to a cancellation of
the self-timer. In addition, the self-timer unit outputs the second
start signal in response to the time elapse of the self-timer. On
the other hand, the first control unit starts buffering a video
in response to a start of the self-timer and releases the video
being buffered without storing it in response to a cancellation
of the self-timer. The second control unit shoots and stores a still
image in response to the time elapse of the self-timer and stores
the video being buffered in synchronization with the time elapse.
[0032] (22) Furthermore, preferably, the second digital camera
further includes a period determination unit. The period determination
unit determines a transition period of time according to a threshold
value and does not store the video when the transition period of
time is less than the threshold value. The transition period of
time is a time from when the first start signal is input to when
the second start signal is input.
[0033] (23) Furthermore, preferably, the second digital camera
further includes a brightness determination unit. The brightness
determination unit evaluates the brightness of the video and does
not store the video when evaluating the brightness of the video
to be dark.
[0034] (24) Furthermore, preferably, the brightness determination
unit stores not the video but a sound portion of the video when
evaluating the brightness of the video to be dark.
[0035] (25) Furthermore, preferably, the second digital camera
further includes a freeze video creating unit. The freeze video
creating unit creates freeze video used for reproducing the still
image for a predetermined period of time. The second control unit
stores a video file in which the video and the freeze video are
connected in reproduction order.
[0036] (26) Furthermore, preferably, the second digital camera
further includes a shooting preparation unit. The shooting preparation
unit performs a shooting preparation of an automatic exposure control
and/or an automatic focusing control. The first control unit performs
the shooting preparation in response to an input of the first start
signal and starts buffering the video after the shooting preparation.
BRIEF DESCRIPTION OF THE DRAWINGS
[0037] The nature, principle, and utility of the invention will
become more apparent from the following detailed description when
read in conjunction with the accompanying drawings in which like
parts are designated by identical reference numbers, in which:
[0038] FIG. 1 is a block diagram illustrating the configuration
of a first embodiment of the invention;
[0039] FIG. 2 is a flowchart explaining operations according to
the first embodiment;
[0040] FIG. 3A is a view explaining a folder in which a file is
stored;
[0041] FIG. 3B is a view explaining a folder in which a file is
stored;
[0042] FIG. 4A is a view illustrating a rotational conversion for
a VGA still image according to a shooting position;
[0043] FIG. 4B is a view illustrating a rotational conversion for
a VGA still image according to a shooting position;
[0044] FIG. 5 is a view illustrating a file structure in which
video files are connected to one another;
[0045] FIG. 6 is a flowchart explaining operations according to
a second embodiment;
[0046] FIG. 7 is a flowchart explaining operations according to
a third embodiment;
[0047] FIG. 8 is a flowchart explaining operations according to
a fourth embodiment;
[0048] FIG. 9 is a flowchart explaining operations according to
a fifth embodiment;
[0049] FIG. 10 is a flowchart explaining operations according to
a sixth embodiment;
[0050] FIG. 11 is a flowchart explaining operations according to
a seventh embodiment;
[0051] FIG. 12 is a flowchart explaining operations according to
an eighth embodiment;
[0052] FIG. 13 is a flowchart explaining operations according to
a ninth embodiment;
[0053] FIG. 14 is a flowchart explaining operations according to
a tenth embodiment;
[0054] FIG. 15A is a view illustrating a display screen; and
[0055] FIG. 15B is a view illustrating a display screen.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0056] Hereinafter, preferred embodiments of the invention will
be described in detail with reference to the accompanying drawings.
First Embodiment
Configuration of a First Embodiment
[0057] FIG. 1 is a block diagram illustrating the configuration
of a first embodiment of the invention.
[0058] In FIG. 1, a digital camera 11 is mounted with a lens 12.
A light receiving surface of an image sensor 13 is disposed within
an image space of the lens 12. An image capturing operation of the
image sensor 13 is controlled by an output pulse of a timing generator
22b.
[0059] Image data outputted from the image sensor 13 is temporarily
stored in a buffer memory 17 through an A/D conversion unit 15 and
a signal processing unit 16.
[0060] The buffer memory 17 is connected to a bus 18. The bus 18
is connected to an image processing unit 19, a card interface 20,
a microprocessor 22, a compression/decompression unit 23, an image
display unit 24, a red eye reduction light emitting unit 30, a flash
emitting unit 31, and a sound processing unit 32.
[0061] The card interface 20 performs data reading and writing
operations with respect to a detachable memory card 21.
[0062] Further, the microprocessor 22 is input with signals from
a switch group 22a, a release button 22c, and a positioning sensor
22d. The switch group 22a includes a menu button, a mode operation
button, a multi-selector button, a command dial, and the like.
[0063] Furthermore, the image display unit 24 displays an image
on a monitor screen 25 provided on a rear surface of the digital
camera 11.
[0064] In addition, the sound processing unit 32 is connected to
a microphone 33.
Operations in the First Embodiment
[0065] The first embodiment has the following operational features.
[0066] (1) A video is buffered by pressing the release button 22c
halfway.
[0067] (2) A buffered video is deleted by releasing a half pressing
operation.
[0068] (3) A video buffering operation is completed by pressing
the release button 22c fully.
[0069] (4) A freeze video data is created from a still image.
[0070] (5) An image rotation processing on freeze video data is
done according to the camera orientation.
[0071] (6) A merging processing on video data and freeze video
data is performed.
[0072] FIG. 2 is a flowchart explaining the operations described
above. Hereinafter, the operations will be described in the order
of reference step numbers.
[0073] First, when the main power source of the digital camera
11 is turned on, the microprocessor 22 performs a predetermined
initial setting to proceed to step S1.
[0074] In step S1, the microprocessor 22 opens a memory region
within the buffer memory 17. By this operation, videos that were
stored in the buffer memory 17 in the past are deleted.
[0075] In step S2, the digital camera 11 displays captured images
(video) on the monitor screen 25 in almost real time. In this case,
in order to realize a smooth video display, the number of lines
to be read out in the image sensor 13 is reduced, and thus VGA images
having a high frame rate (for example, 30 frames/sec.) are continuously
read out (a so-called draft mode).
[0076] The microprocessor 22 performs an exposure setting in the
draft mode on the basis of a result of a side light processing (for
example, signal levels of VGA images).
[0077] In step S3, the microprocessor 22 performs a focus control
(for example, an AF (automatic focusing) for high contrast using
VGA images) for the draft mode. Here, the microprocessor 22 performs
a high-speed focusing control at a low precision in order to keep
up with a composition change by a user.
[0078] In step S4, the microprocessor 22 sequentially drives the
image sensor 1 3 through the timing generator 22b in the draft mode,
thereby sequentially capturing VGA images.
[0079] In step S5, the VGA images that have been read out as described
above are displayed on the monitor screen 25 by the image display
unit 24.
[0080] In step S6, the microprocessor 22 monitors a half pressing
operation on the release button 22c in addition to the monitor display.
[0081] Here, if the half pressing operation is not detected, the
microprocessor 22 returns to step S2.
[0082] On the other hand, if the half pressing operation (input
of a first start signal) is detected, the microprocessor 22 proceeds
to step S7.
[0083] In step S7, corresponding to the proceeding to the half
press period, the microprocessor 22 performs highly precise focusing
control for shooting a still image so as to prepare for a still
image shooting (pressing a release button fully).
[0084] In step S8, the microprocessor 22 determines an exposure
value (iris value, charge storage time, sensitivity) for the still
image shooting on the basis of the result of a side light processing
(for example, signal levels of VGA images).
[0085] Further, the microprocessor 22 performs an exposure setting
for a video shooting position such that the same exposure as in
the still image shooting is obtained. That is, the microprocessor
22 decides the iris value such that the same exposure result as
in the still image shooting is obtained in a condition in which
a charge storage time for the video shooting position is 1/30 second.
At this time, when the exposure is not sufficient even with an open
iris, the insufficient exposure is supplemented by increasing the
sensitivity (gain of an A/D converter 15).
[0086] Meanwhile, in a case in which the exposure is excessive
even with the minimum iris aperture, for example, the charge storage
time is set to be reduced to 1/100 second.
[0087] In step S9, the microprocessor 22 sequentially drives the
image sensor 13 through the timing generator 22b in the draft mode
so as to keep capturing VGA images.
[0088] In step S10, after the microprocessor 22 has completed an
AF (automatic focusing) process (step S7) and an AE (automatic exposure)
process (Step S8), the microprocessor 22 starts a video buffering
(storing the VGA images on the buffer memory 1 7 as video frames)
with respect to the VGA images.
[0089] Further, when the upper limit time (for example, three seconds)
of the video shooting is exceeded, the microprocessor 22 sequentially
deletes the video frames from the oldest one. By this operation,
up-to-date video frames which do not exceed the upper limit time
are maintained in the buffer memory 17.
[0090] In step S11, the image display unit 24 sequentially displays
the VGA images on the monitor screen 25.
[0091] In step S12, upon a release of a half pressing operation
on the release button 22c during the video buffering period, the
microprocessor 22 returns to step S1. In step S1, the video data
buffered in the buffer memory 17 is deleted without being stored
therein. After the buffered video data is deleted, the microprocessor
22 resumes an operation subsequent to step S2 before the half pressing
operation.
[0092] On the other hand, if the half pressing operation on the
release button 22c is continued, the microprocessor 22 proceeds
to step S13.
[0093] In step S13, the microprocessor 22 determines whether or
not the release button 22c is fully pressed.
[0094] If the full pressing operation (input of a second start
signal) is detected, the microprocessor 22 proceeds to step S14.
[0095] Meanwhile, if the full pressing operation is not detected,
the microprocessor 22 returns to step S9.
[0096] In step S14, the microprocessor 22 performs an exposure
operation on the still image by using the exposure value for the
still image shooting. As such, by setting the exposure conditions
on the video shooting (step S9) and the still image shooting (step
S14), it is possible to almost match the brightness of the still
image with the brightness of the video.
[0097] Subsequently, the microprocessor 22 sequentially drives
the image sensor 13 through the timing generator 22b in an overall
pixel reading mode and reads out high-resolution still images. The
still images are digitized by the A/D converter 15 and are subjected
to a defect pixel correction process or a gray scale correction
process by the signal processing unit 16.
[0098] Then, the still images are temporarily stored in the buffer
memory 17 to be subjected to an image processing such as color interpolation,
color calibration, noise removal, and outline emphasis by the image
processing unit 19. The compression/decompression unit 23 compresses
the still images which have been subjected to the image processing.
[0099] In addition, the image processing unit 19 may perform a
signal processing for red eye reduction with respect to a region
where the red eye effect is detected. Moreover, the image processing
unit 19 may analyze gray scales of the still images and then perform
a gray scale correction process so as to make a low exposed image
region bright.
[0100] As such, in particular, a still image in which pixel deterioration
can be easily recognized has a high resolution by performing various
image processes for only the still images. In addition, the entire
processing time can be reduced by omitting an image processing for
videos.
[0101] In step S15, a still image folder that stores the still
images is provided in the memory card 21, as shown in FIG. 3B, and
the card interface 20 stores an image-compressed still image file
in one of the hierarchies of the still image folder.
[0102] In step S16, the image processing unit 19 converts the resolution
of the still image stored in the buffer memory 17 into a VGA size.
[0103] In step S17, the microprocessor 22 detects the camera orientation
during a still image shooting from an output of the positioning
sensor 22d.
[0104] Here, when the still image is shot in a vertical position,
the microprocessor 22 adopts the still image whose resolution has
been converted into the VGA size, as shown in FIG. 4A.
[0105] On the other hand, as shown in FIG. 4B, when the still image
is shot in a horizontal position, the image processing unit 19 rotates
image data having a VGA size of `640 pixels in a row by 480 pixels
in a column`. At this time, a resolution conversion is also performed
such that a long side after the rotational conversion has the number
of pixels below that of a short side before the rotational conversion,
thereby obtaining image data having `360 pixels in a row by 480
pixels in a column`. Further, the image processing unit 19 adds
a predetermined image (image representing a space or the like) outside
a frame range of an image, which has been subjected to the rotational
conversion process, so as to maintain the aspect ratio before the
rotational conversion process, thereby obtaining an image having
`640 pixels in a row by 480 pixels in a column`.
[0106] In step S18, the microprocessor 22 creates freeze video
data, which is reproduced as video frames for three seconds, by
using the VGA still images which have been subjected to the process
in step S17.
[0107] For example, in the case of freeze video data following
a Motion JPEG format, compressed data of the VGA still images is
copied to be sequentially stored in a plurality of video frames.
In addition, in the case of freeze video data following an MPEG
format, compressed data of the VGA still images is copied to be
stored in a plurality of I pictures, and information, which indicates
that an estimation difference between frames is zero, is stored
in an intermediate P or B picture.
[0108] In step S19, the microprocessor 22 stores the VGA still
images as information on header of the video data in the buffer
memory 17. This information is used as header information such as
a thumbnail; when the image data in the buffer is encoded so as
to have a predetermined video file format such as an MPEG, or the
information is used as a so-called capture menu for video reproduction.
[0109] Further, for a video reproduction device (or, reproduction
program), there is software showing an image of a first frame of
the video as a thumbnail image. Accordingly, a VGA still image may
be stored as the first frame of a video. In this case, even though
the VGA still image is reproduced for a moment (for example, 1/30
second) at the video reproduction, it does not affects a video watching
much.
[0110] Through these processes, when video data is to be used later
or is reproduced in a digital camera, there is an advantage in that
desired data can be easily searched. In addition, as compared with
a case in which still images and videos are separately stored, it
is advantageous that correlation information on both types of data
items is not necessary.
[0111] In step S20, the microprocessor 22 performs an editing process
such that the freeze video data created in step S18 is connected
to a last frame of the video data in the buffer memory 17.
[0112] In step S21, the compression/decompression unit 23 performs
encoding processes, such as motion JPEG, MPEG2, MPEG4, H264, or
the like, for the edited video data in the buffer memory 17, thereby
creating a video file. As shown in FIG. 3A, a video file folder
is provided in the memory card 21. The card interface 20 stores
an encoded video file in one of the hierarchies of the folder.
[0113] Further, as shown in FIG. 5, the microprocessor 22 may create
a video file in the memory card 21, the video file including a series
of edited video data items. The video file is created by sequentially
connecting the video files, which were stored in the memory card
21in the past, to up-to-date video files with date display inserted
between some of them.
[0114] In step S22, after the recording process has been completed,
the microprocessor 22 proceeds to step S1 so as to prepare for the
next shooting process. In addition, when the main power source of
the digital camera 11 is turned off, the microprocessor 22 waits
the recording process to be completed so as to terminate the operation.
Effects, etc. of the First Embodiment
[0115] As describe above, in the-first embodiment, the freeze video
data which reproduces still images for a predetermined period of
time is created. The freeze video data can be reproduced in the
same manner as a typical video, even though a video-dedicated reproduction
device is used.
[0116] Further, in the first embodiment, the video file is created
by connecting the freeze video data to the video data before the
full press operation on a release button. By reproducing the video
file, it is possible to continuously reproduce the still images
(freeze video) and the video data before a release button is fully
pressed at once. As a result, it is not necessary to individually
search a video file portion and a still image portion so as to reproduce
them, thereby realizing a convenient digital camera. In addition,
since the video and the still images are unified as one video file,
a filing work within the memory card 21 becomes easy.
[0117] Further, since the video buffering operation is released
by releasing the half pressing operation, unnecessary video data
is simply discarded and it is possible to easily perform a video
recording process a number of times.
[0118] Furthermore, in the first embodiment, the video buffering
operation starts after AE and AF operations for the still image
shooting have been completed. Accordingly, the brightness of the
video data and the brightness of the freeze video data can be approximately
equal to each other. As a result, when the video file is reproduced,
the video can be naturally displayed without a visually recognizable
brightness change at a time when the video changes to the still
image or the still image changes to the video.
[0119] Furthermore, in the first embodiment, the resolution of
the freeze video data is converted corresponding to the screen size
(the number of vertical and horizontal pixels) of the video data
in the draft mode. By performing the resolution conversion, the
display resolution at a portion switching between the video data
and freeze video data does not change. As a result, a smooth reproduction
switch from the video to the freeze video is realized.
[0120] Furthermore, in the first embodiment, the VGA still images
are rotationally converted corresponding to the shooting position
and then the rotationally converted VGA still images are copied
to be stored in video frames. In this case, since the VGA still
images is rotationally converted only once during a recording operation,
there is an advantage in that processing cost is reduced as compared
with a case in which a reproduction device performs the rotational
conversion for the video frames one by one.
[0121] Furthermore, in the first embodiment, in the rotational
conversion, the VGA size is adjusted. Accordingly, in the reproduction
device, when the display conversion for the horizontal position/vertical
position is performed, a smooth reproduction switching operation
from the video to the freeze video can be performed without any
special aspect conversion process or without converting display
resolution.
[0122] Furthermore, as shown in FIG. 5, a series of video files
may be created as one file in the digital camera 11. With the video
file, the video data and freeze video data can be sequentially switched
to be reproduced in a general-purpose video reproduction device.
For this reason, specified reproduction conditions are not required,
so that it is possible to create a better general-purpose video
file suitable for being transferred to an acquaintance or the like.
[0123] In addition, in the series of video files shown in FIG.
5, it is possible to display the capture menu in which VGA still
images are arranged as a selection item by using the general-purpose
reproduction device. By operating the capture menu, it is possible
to directly access a desired image.
[0124] Next, another embodiment will be described.
Second Embodiment
[0125] The configuration of a second embodiment is the same as
that of the first embodiment (FIG. 1), and thus explanation thereof
will be omitted.
[0126] The second embodiment is characterized in that a sound or
an effective image to show that the switching between video and
still image displays is done (hereinafter, effective switching image)
is added in addition to video data and freeze video data.
[0127] FIG. 6 is a flowchart explaining operations in the second
embodiment. Hereinafter, the operations will be described in the
order of reference step numbers shown in FIG. 6.
[0128] In steps S120 to S131, the same processes as in steps S1
to S11 in the first embodiment are performed.
[0129] In step S132, the sound processing unit 32 acquires sound
data (hereinafter, referred to as first sound data) from the microphone
33 and stores it in the buffer memory 17, simultaneously with the
video buffering, and then sets it as a synchronized reproduced sound
of the video data.
[0130] In steps S133 and S134, the same processes as in steps S12
and S13 in the first embodiment are performed.
[0131] In step S135, the sound processing unit 32 acquires sound
data (hereinafter, referred to as `second sound data`) from the
microphone 33 for three seconds from a period of time when the release
button 22c is fully pressed, and stores it in the buffer memory
17.
[0132] In steps S136 to S141, the same processes as in steps S14
to S19 in the first embodiment are performed.
[0133] In step S142, the microprocessor 22 connects a predetermined
effective switching image and freeze video data to a last frame
of video data in the buffer memory 17.
[0134] In step S143, the microprocessor 22 adds predetermined sound
effect data and the second sound data as synchronized reproduced
sounds for the effective switching image and the freeze video data,
respectively.
[0135] In steps S144 and S145, the same processes as in steps S21
and S22 in the first embodiment are performed.
Effects, etc. of the Second Embodiment
[0136] As described above, in the second embodiment, it is possible
to obtain the same effects as in the first embodiment.
[0137] Further, in the second embodiment, the second sound data
during a period of time including a period of time when still images
are captured is added to the freeze video data as a synchronized
reproduced sound. As a result, when the freeze video data is reproduced,
a sound at a time of capturing the data can be reproduced, so that
it is possible to make the freeze video data even more realistic.
[0138] Furthermore, in the second embodiment, special effects (sound
effect data and effective switching image) are added at a portion
switching between the video and the freeze video (still images).
For example, in the digital camera 11, it is preferable to selectively
add the following special effects.
[0139] (1) A sound that imitates a shutter sound
[0140] (2) An effective switching image that imitates a switching
operation of a shutter
[0141] (3) A combustion sound or an explosion sound of a bulb in
a case of a flash shooting for a still image
[0142] (4) An effective switching image that imitates smoke of
the bulb in a case of a flash shot for a still image
[0143] Further, when the synchronized reproduced sound of the freeze
video data does not exist or is short, preferably, the freeze video
data is reproduced in synchronization with the sound effect data
in a state in which the sound effect data is set to be slightly
long, thereby reinforcing impression on the freeze video data.
[0144] With the special effects, it is possible to effectively
perform a switching operation from a dynamic image to a static image
at a portion switching between the video data and the freeze video
data.
[0145] Further, at the first and last parts of the sound data,
the sound data is preferably subjected to a fade in or fade out
process so that the sound does not start or stop unexpectedly.
[0146] Furthermore, the second sound data may be shortened to about
one second from a full pressing operation without being matched
with the reproduction time of the freeze video. In this case, there
is no possibility that noise will be recorded, like in a case in
which a camera is put into a bag right after the shooting.
[0147] Next, still another embodiment will be described.
Third Embodiment
[0148] The configuration of a third embodiment is the same as that
of the first embodiment (FIG. 1), and thus explanation thereof will
be omitted.
[0149] The third embodiment is characterized in that a video file
in which freeze video data and video data are connected in this
order is created.
[0150] FIG. 7 is a flowchart explaining operations in the third
embodiment. Hereinafter, the operations will be described in the
order of reference step numbers shown in FIG. 7.
[0151] In step S301, the same process as in step SI in the first
embodiment is performed.
[0152] In step S302, before shooting a still image, the sound processing
unit 32 acquires sound data (hereinafter, referred to as `second
sound data`) from the microphone 33 and stores it in the buffer
memory 17. The sound processing unit 32 sequentially discards past
sound data exceeding three seconds among the second sound data items.
[0153] In steps S303 to S310, the same processes as in steps S2
to S9 in the first embodiment are performed.
[0154] In steps S311, the same process as in step S11 in the first
embodiment is performed.
[0155] In step S312, upon a release of the half press to the release
button 22c after such a half pressing operation, the microprocessor
22 returns to step S302.
[0156] On the other hand, if the half pressing operation on the
release button 22c is continued, the microprocessor 22 proceeds
to step S313.
[0157] In step S313, the microprocessor 22 determines whether or
not the release button 22c is fully pressed.
[0158] If the full pressing operation is detected, the microprocessor
22 proceeds to step S314.
[0159] Meanwhile, if the full pressing operation is not detected,
the microprocessor 22 returns to step S310.
[0160] In steps S314, the same process as in step S14 in the first
embodiment is performed.
[0161] In step S315, the microprocessor 22 stops storing the second
sound data.
[0162] In step S316, the microprocessor 22 sequentially drives
the image sensor 13 through the timing generator 22b in the draft
mode to thereby store VGA-sized video data corresponding to three
seconds in the buffer memory 17. The sound processing unit 32 acquires
sound data (hereinafter, referred to as `first sound data`) from
the microphone 33 for the three seconds during which the video is
shot and stores it in the buffer memory 17 as a synchronized reproduced
sound.
[0163] In steps S317 to S320, the same processes as in steps S15
and S18 in the first embodiment are performed.
[0164] In step S321, the microprocessor 22 performs an editing
process such that a predetermined effective switching image and
the video data created in step S316 are connected to a last frame
of the freeze video data in the buffer memory 17.
[0165] In step S322, the microprocessor 22 adds the second sound
data and predetermined sound effect data as synchronized reproduced
sounds for the freeze video data and the effective switching image,
respectively.
[0166] In steps S323 and S324, the same processes as in steps S21
and S22 in the first embodiment are performed.
Effects, etc. of the Third Embodiment
[0167] As described above, in the third embodiment, it is possible
to obtain the same effects as in the first embodiment.
[0168] Further, in the third embodiment, special effects (sound
effect data and effective switching image) are added at a portion
switching between the video and the freeze video (still images).
For example, in the digital camera 11, it is preferable to selectively
add the following special effects.
[0169] (1) A sound that gives a starting sound such as `start!`
[0170] (2) An effective switching image that imitates a switching
operation of a clapperboard in making a film
[0171] (3) A combustion sound or an explosion sound of a bulb in
a case of a flash shooting for a still image
[0172] (4) An effective switching image that imitates smoke of
the bulb in a case of a flash shooting for a still image
[0173] By using the special effects, it is possible to effectively
perform a switching operation from the static image to the dynamic
mode.
[0174] Next, still another embodiment will be described.
Fourth Embodiment
[0175] The configuration of a fourth embodiment is the same as
that of the first embodiment (FIG. 1), and thus explanation thereof
will be omitted.
[0176] The fourth embodiment is characterized in that a video file
for automatic slide view is created by connecting a plurality of
freeze video data items.
[0177] FIG. 8 is a flowchart explaining operations in the fourth
embodiment. Hereinafter, the operations will be described in the
order of reference step numbers shown in FIG. 8.
[0178] In steps S401 to S409, the same processes as in steps S1
to S9 in the first embodiment are performed.
[0179] In steps S410 to S417, the same processes as in steps S11
to S18 in the first embodiment are performed.
[0180] In step S418, the microprocessor 22 adds identification
information for specifying an original still image file to the freeze
video data.
[0181] In step S419, the microprocessor 22 compares a shooting
date of a previously shot still image file with a shooting date
of an up-to-date still image file.
[0182] If the shooting dates of the files are different from each
other, the microprocessor 22 determines that there is a change of
a shooting date to proceed to step S420.
[0183] On the other hand, if the shooting dates of the files are
equal to each other, the microprocessor 22 proceeds to step S421.
[0184] In step S420, the microprocessor 22 creates an image including
date information displayed thereon and adds it as a first frame
of the freeze video data.
[0185] In step S421, the microprocessor 22 performs an editing
process such that the up-to-date freeze video data is connected
to the video file (in which the past freeze video data items are
connected to one another) for automatic slide view stored in the
memory card 21.
[0186] In step S422, the microprocessor 22 adds the VGA still image
created in step S416 as a capture menu of the video file for the
automatic slide view.
[0187] In step S423, after the recording process has been completed,
the microprocessor 22 proceeds to step S401 so as to prepare for
the next shooting process. In addition, when the main power source
of the digital camera 11 is turned off, the microprocessor 22 waits
the recording process to be completed so as to terminate the operation.
Effects, etc. of the Fourth Embodiment
[0188] As described above, in the fourth embodiment, the video
file in which the freeze video data items are connected to one another
is created. By reproducing the video file in a reproduction device
in the same manner as the typical video, it is possible to reliably
and easily perform the automatic slide reproduction.
[0189] Further, in the fourth embodiment, the VGA still image is
added as a capture menu of the video file for the automatic slide
view. Thereby, a user can select a desired VGA still image by using
a chapter menu function of the reproduction device. As a result,
it is possible to start the automatic slide reproduction from the
desired freeze video data.
[0190] Furthermore, in the fourth embodiment, only a VGA still
image with a different date from that of an immediately preceding
still image may be added as the capture menu. In this case, it is
possible to start the automatic slide reproduction from an image
corresponding to a desired shooting date by using the chapter menu
function of the reproduction device.
[0191] Furthermore, in the fourth embodiment, a date is added to
a portion at which the shooting dates of the video files change.
As a result, it is possible to see where the shooting date changes
by the date display during the automatic slide reproduction.
[0192] Furthermore, in the fourth embodiment, the identification
information for specifying a still image file from which the freeze
video data is created is stored for each of the freeze video data
items in the video file. Therefore, by using a function of a reproduction
device, it is possible to easily realize a function of, for example,
switching to high-resolution display of the still image file according
to the identification information during the automatic slide reproduction.
[0193] Next, still another embodiment will be described.
Fifth Embodiment
[0194] The configuration of a fifth embodiment is the same as that
of the first embodiment (FIG. 1), and thus explanation thereof will
be omitted.
[0195] The fifth embodiment is characterized in that a video buffering
operation is performed when framing of the digital camera 11 is
determined to be stable.
[0196] FIG. 9 is a flowchart explaining operations in the fifth
embodiment. Hereinafter, the operations will be described in the
order of reference step numbers shown in FIG. 9.
[0197] In steps S31 to S35, the same processes as in steps S1 to
SS in the first embodiment are performed.
[0198] In step S36, the microprocessor 22 obtains pixel differences
between frames of the VGA image and then obtains a total sum with
respect to the absolute values of the pixel differences.
[0199] If the total sum is less than a threshold value, the microprocessor
22 determines that the framing is stable (input of a first start
signal), proceeding to step S37.
[0200] On the other hand, if the total sum is more than the threshold
value, the microprocessor 22 determines that the framing is unstable,
returning to step S32.
[0201] In addition, for the determination of the framing stability,
a VGA image may be divided into, for example, 255 blocks, so as
to obtain the average brightness for each block, and then the framing
stability may be determined from the variation of the average brightness
between frames. Alternatively, when a face of a photographic subject
is detected by a known face recognition technique, the framing stability
may be determined from a movement of the face of the photographic
subject and a size change thereof.
[0202] In steps S37 to S41, the same processes as in steps S7 to
S11 in the first embodiment are performed.
[0203] In step S42, the microprocessor 22 determines whether or
not the release button 22c has been fully pressed.
[0204] If the full pressing operation is detected, the microprocessor
22 proceeds to step S44.
[0205] Meanwhile, if the full pressing operation is not detected,
the microprocessor 22 returns to step S43 so as to continue the
video buffering operation.
[0206] In step 543, the microprocessor 22 continues to determine
the framing stability even when the video buffering operation is
performed.
[0207] As a result, when the framing is determined to be stable,
the microprocessor 22 returns to step S39 so as to continue the
video buffering operation.
[0208] On the other hand, if the framing is determined to be unstable
(cancellation of the first start signal), the microprocessor 22
returns to step S31. In this case, the video data buffered in the
buffer memory 17 is deleted without being stored therein. After
the buffered video data is deleted, the microprocessor 22 resumes
an operation subsequent to step S32.
[0209] In steps 544 to S52, the same processes as in steps S14
to S22 in the first embodiment are performed.
Effects, etc. of the Fifth Embodiment
[0210] As describe above, in the fifth embodiment, the video buffering
operation starts when the framing is determined to be stable, and
when the framing is determined to be unstable, the buffered video
is deleted without being stored therein. By using such a function,
even though a user is poor at the half pressing operation on the
release button 22c, it is possible to easily start and cancel the
video buffering operation.
[0211] Further, in the fifth embodiment, the video buffering operation
may be performed only in a condition that the release button is
halfway pressed and the framing is stable.
[0212] Furthermore, in the fifth embodiment, even though the movement
of the photographic subject causes the video capturing operation
to start, however, with a digital camera (for example, a mobile
camera phone) added with an illumination function, the video capturing
operation may start in conjunction with an ON operation of the illumination
function.
[0213] Next, still another embodiment will be described.
Sixth Embodiment
[0214] The configuration of a sixth embodiment is the same as that
of the first embodiment (FIG. 1), and thus explanation thereof will
be omitted.
[0215] The sixth embodiment is characterized in that the video
buffering operation is performed by using a self-timer.
[0216] FIG. 10 is a flowchart explaining operations in the sixth
embodiment. Hereinafter, the operations will be described in the
order of reference step numbers shown in FIG. 10.
[0217] In steps S61 to S65, the same processes as in steps S1 to
S5 in the first embodiment are performed.
[0218] In step S66, when the release button 22c is pressed under
a state in which the switch group 22a is set in a self-timer mode,
the microprocessor 22 determines that the self-timer has started
to work.
[0219] As such, when it is detected (input of the first start signal)
that the self-timer has started to work, the microprocessor 22 proceeds
to step S67.
[0220] On the other hand, if it is not detected that the self-timer
does not work, the microprocessor 22 returns to step S62.
[0221] In steps S67 to S71, the same processes as in steps S7 to
S11 in the first embodiment are performed.
[0222] In step S72, when the switch group 22a is set in a mode
other than the self-timer mode, the microprocessor 22 determines
that the self-timer does not work.
[0223] On the other hand, if the self-timer does not work (cancellation
of the first start signal), the microprocessor 22 returns to step
S61. In this case, the video data buffered in the buffer memory
17 is deleted without being stored therein. After the buffered video
data is deleted, the microprocessor 22 resumes an operation subsequent
to step S62.
[0224] Meanwhile, when the self-timer keeps working, the microprocessor
22 proceeds to step S73.
[0225] In step S73, the microprocessor 22 determines whether or
not the setting time of the self-timer has elapsed.
[0226] If the setting time of the self-timer has elapsed (input
of the second start signal), the microprocessor 22 proceeds to step
S74.
[0227] On the other hand, if the setting time of the self-timer
has not elapsed, the microprocessor 22 proceeds to step S69 so as
to keep buffering during the self-timer period.
[0228] In steps S74 to S82, the same processes as in steps S14
to S22 in the fourth embodiment are performed.
Effects, etc. of the Sixth Embodiment
[0229] As describe above, in the sixth embodiment, the video buffering
operation is performed 10 while the self-timer works. In this case,
immediately before a still image shooting by the self-timer, it
is possible to record various scenes happening in front of a digital
camera as a video. Further, since the buffered video is deleted
at the same time with the cancellation of the self-timer, it is
preventable of accumulation of unnecessary videos in the memory
card 21.
[0230] Next, still another embodiment will be described.
Seventh Embodiment
[0231] The configuration of a seventh embodiment is the same as
that of the first embodiment (FIG. 1), and thus explanation thereof
will be omitted.
[0232] The seventh embodiment is characterized in that a video
recording operation is controlled depending on the brightness of
a photographic subject.
[0233] FIG. 11 is a flowchart explaining operations in the seventh
embodiment. Hereinafter, the operations will be described in the
order of reference step numbers shown in FIG. 11.
[0234] In steps S91 to S98, the same processes as in steps SI to
S8 in the first embodiment are performed.
[0235] In step S99, the microprocessor 22 determines whether or
not the brightness of a VGA image (that is, the brightness of a
photographic subject) is higher than a first threshold value. The
first threshold value is for determining whether or not the brightness
of the photographic subject is suitable for a video shooting.
[0236] If the brightness of the photographic subject is higher
than the first threshold value, the microprocessor 22 determines
that the brightness of the photographic subject is suitable for
the video shooting, proceeding to step S101.
[0237] On the other hand, if the brightness of the photographic
subject is lower than the first threshold value, the microprocessor
22 determines that the brightness of the photographic subject is
not suitable for the video shooting, proceeding to step S100.
[0238] In step S100, the microprocessor 22 stores only sound data
acquired from the sound processing unit 32 in the buffer memory
17. Then, the microprocessor 22 proceeds to step S103.
[0239] In step 5101, the microprocessor 22 sequentially drives
the image sensor 13 through the timing generator 22b in the draft
mode to thereby keep shooting VGA images.
[0240] In step S102, the microprocessor 22 sequentially stores
the VGA images and the sound data in the buffer memory 17.
[0241] In step S103, the image display unit 24 sequentially displays
the VGA images on the monitor screen 25.
[0242] In step S104, if a half pressing operation on the release
button 22c is released during the video buffering operation, the
microprocessor 22 returns to step S91. Thereby, the buffered video
is deleted without being stored by returning to the step S91. After
the buffered video is deleted, the microprocessor 22 resumes an
operation subsequent to step S92.
[0243] On the other hand, if the half pressing operation on the
release button 22c is continued, the microprocessor 22 proceeds
to step S105.
[0244] In step S105, the microprocessor 22 determines whether or
not the release button 22c has been fully pressed.
[0245] If the full pressing operation is detected, the microprocessor
22 proceeds to step S106.
[0246] On the other hand, if the full pressing operation is not
detected, the microprocessor 22 returns to step S99.
[0247] In step S106, if there is no buffered video in the buffer
memory 17, the microprocessor 22 proceeds to pre-emission for reducing
a red eye effect in step S107. Meanwhile, if the buffered video
is in the buffering memory 17, it proceeds to step S108 without
the pre-emission for reducing the red eye effect. In general, it
takes about one second for the pre-emission for reducing the red
eye effect. As a result, with the pre-emission, the time interval
between the video portion and the still image portion (freeze video
data) is apart, accordingly, an image will be discontinuous at a
connecting point therebetween. For this reason, the pre-emission
is omitted so as to prevent the image at the connection point from
being discontinuous.
[0248] In step S107, the microprocessor 22 controls the flash emitting
unit 31so as to pre-emit for reducing the red eye effect.
[0249] In step S108, the microprocessor 22 determines whether or
not the brightness of a photographic subject is higher than a second
threshold value. The second threshold value is for determining whether
or not the flash emission is necessary for the still image shooting.
[0250] If the brightness of the photographic subject is higher
than the second threshold value, the microprocessor 22 determines
that the flash emission operation is not necessary, proceeding to
step S101.
[0251] On the other hand, if the brightness of the photographic
subject is lower than the second threshold value, the microprocessor
22 determines that the flash emission operation is necessary, proceeding
to step S109.
[0252] In step S109, the microprocessor 22 controls the flash emitting
unit 31 so as to perform the flash emission operation in synchronization
with the still image shooting operation.
[0253] In steps S110 to S114, the same processes as in steps S14
to S18 in the first embodiment are performed.
[0254] In step S115, the microprocessor 22 determines whether or
not a half pressing time for the release button 22c is shorter than
a third threshold value. The third threshold value is a threshold
value that determines whether or not the release button 22c has
been fully pressed at a stroke, or whether or not the half pressing
operation has been a momentarily invalid operation.
[0255] Here, if the half pressing time is shorter than the third
threshold value, the microprocessor 22 determines that the momentary
video data is not valid, proceeding to step S116.
[0256] On the other hand, if the half pressing time is longer than
the third threshold value, the microprocessor 22 determines that
the video data is valid, proceeding to step S117.
[0257] Further, according to the minimum reproduction time of a
minimum unit GOP (group of pictures) of video data in the video
format, it is preferable to set about 0.5 seconds as the third threshold
value.
[0258] In step S116, the microprocessor 22 deletes invalid video
buffered in the buffer memory 17 and stores the freeze video data
in the memory card 21. Then, the microprocessor 22 proceeds to step
S120.
[0259] In steps S117 to S120, the same processes as in steps S19
to S22 in the first embodiment are performed.
Effects, etc. of the Seventh Embodiment
[0260] As describe above, in the seventh embodiment, if it is determined
that the video buffering period is short, the video data is not
stored. As a result, it is possible to easily and reasonably avoid
a problem that one burst press to the release button 22c causes
an accumulation of a momentary, unwanted video in a recording medium.
[0261] Further, in the seventh embodiment, even when the brightness
of the photographic subject is dark, the video data is not stored.
As a result, it is possible to easily and reasonably avoid a problem
that a dark, undesirable video is accumulated in a recording medium.
[0262] Furthermore, the freeze video data is created from a bright
still image with flash illumination. Conventionally, when video
data is reproduced as freeze video, a video frame as is dark pauses
and displays, so that the image has lots of noise and accordingly
cannot be easily viewed. However, in the seventh embodiment, since
a bright freeze video with flash illumination is displayed, it is
possible to realize bright and clear still image display.
[0263] Furthermore, by switching the reproduction display from
the dark video data to the bright freeze video data with the flash
illumination, it is possible to perform realistic reproduction display
with the flash emission.
[0264] Furthermore, in the seventh embodiment, when the brightness
of the photographic subject is dark, only sound data is stored instead
of the video data. As a result, even in a dark condition which is
not suitable for the video shooting, it is possible to record images
realistically by means of the sound.
[0265] Next, still another embodiment will be described.
Eighth Embodiment
[0266] The configuration of an eighth embodiment is the same as
that of the first embodiment (FIG. 1), and thus explanation thereof
will be omitted.
[0267] The eighth embodiment is characterized in that typical video
data is set at a relatively high compression rate by giving priority
to the data size, and freeze video data is set at a compression
rate lower than that of the video data by giving priority to the
picture quality.
[0268] FIG. 12 is a flowchart explaining operations in the eighth
embodiment. Hereinafter, the operations will be described in the
order of reference step numbers shown in FIG. 12.
[0269] In steps S151 to S170, the same processes as in steps S1
to S20 in the first embodiment are performed.
[0270] In step S171, the compression/decompression unit 23 encodes
video data stored during a half press. For example, when the video
data is compressed to an MPEG2 video file, the compression/decompression
unit 23 performs the encoding operation by compressing an I picture
serving as a basic image at a first compression rate (high pressure).
Since there is movement between the frames with regard to the video
data, the deterioration of visual picture quality is reduced even
when the compression rate is set high. In addition, the compressed
amount of the video data is reduced.
[0271] Step S172, subsequently, the decompression unit 23 performs
the encoding operation for the freeze video data. For example, in
the case where the video data is compressed to an MPEG2 video file,
the I picture serving as a basic image is compressed at a second
compression rate (low compression rate). As a result, for the freeze
video data, deterioration of visual picture quality is reduced.
Further, in the case of the freeze video data, since it is possible
to reduce the information amount for a B or P picture representing
image variation between frames even though the compressed amount
of the I picture is large, the compressed amount of the freeze video
data is not greatly increased.
[0272] In step S173, the microprocessor 22 stores compressed data
encoded by the compression/decompression unit 23 in the memory card
21.
[0273] In step S174, the same process as in step S22 in the first
embodiment is performed.
Effects, etc. of the Eighth Embodiment
[0274] As describe above, in the eighth embodiment, the same effects
as in the first embodiment can be obtained.
[0275] Further, in the eighth embodiment, when the video data and
the freeze video data are compressed, the compression rate switches
according to features of both types of the data items.
[0276] Thereby, the picture quality is not visually recognizable,
and it is possible to record an image in which an overall compressed
amount is suppressed to be small.
[0277] Next, still another embodiment will be described.
Ninth Embodiment
[0278] The configuration of a ninth embodiment is the same as that
of the first embodiment (FIG. 1), and thus explanation thereof will
be omitted.
[0279] The ninth embodiment is characterized in that the resolution
of video data switches.
[0280] FIG. 13 is a flowchart explaining operations in the ninth
embodiment. Hereinafter, the operations will be described in the
order of reference step numbers shown in FIG. 13.
[0281] In steps S181 to S189, the same processes as in steps S1
to S9 in the first embodiment are performed.
[0282] In step S190, the image processing unit 19 enlarges a VGA
image (video frame) by using a pixel interpolation, and thus the
resolution of the VGA image is converted into a resolution of `960
pixels in a row by 720 pixels in a column`. After the resolution
has been converted, the image has a size suitable for screen display
of `1280 pixels in a row by 720 pixels in a column` which is a simple
high-vision format.
[0283] In steps S191 to S196, the same processes as in steps S10
to S15 in the first embodiment are performed.
[0284] In step S197, the image processing unit 19 performs a process
of reducing the resolution on the basis of still images in the buffer
memory 17, thereby creating a still image (hereinafter, referred
to as a simple high-vision still image) having a resolution of `960
pixels in a row by 720 pixels in a column` which is the same as
that of the video data.
[0285] In step S198, when it is detected that the simple high-vision
still image has been shot in the horizontal position on the basis
of a detection result on the camera orientation, the image processing
unit 19 performs rotational conversion, resolution conversion, and
space adding processes for the simple high-vision still image.
[0286] In step S199, the microprocessor 22 creates freeze video
data, which is reproduced as video frames for three seconds, by
using the high-vision still image which has been subjected to the
process in step S198.
[0287] In step S200, the microprocessor 22 stores the simple high-vision
still image as information on the header of the video data in the
buffer memory 17.
[0288] In steps S201 to S205, the same processes as in steps S170
to S1 74 in the eighth embodiment are performed.
Effects, etc. of the Ninth Embodiment
[0289] As describe above, in the ninth embodiment, the same effects
as in the first embodiment can be obtained.
[0290] Further, in the ninth embodiment, each resolution of the
video data and the freeze video data is converted into a resolution
of `960 pixels in a row by 720 pixels in a column`, and thus it
is possible to realize both video and still image displays suitable
for enjoying images in a high-definition television or the like
following the high-vision format.
[0291] Next, still another embodiment will be described.
Tenth Embodiment
[0292] The configuration of a tenth embodiment is the same as that
of the first embodiment (FIG. 1), and thus explanation thereof will
be omitted.
[0293] The tenth embodiment is characterized in that an image immediately
before a full press is acquired from video data as so to create
freeze video data.
[0294] FIG. 14 is a flowchart explaining operations in the tenth
embodiment. Hereinafter, the operations will be described in the
order of reference step numbers shown in FIG. 14.
[0295] In steps S211 to S225, the same processes as in steps S1
to S15 in the first embodiment are performed.
[0296] In step S226, the microprocessor 22 reads out a VGA image
immediately before a full press from a video buffered in the buffer
memory 17.
[0297] In step S227, the microprocessor 22 rotationally converts
the VGA image immediately before the full press, according to the
camera orientation acquired from the positioning sensor 22d.
[0298] In step S228, the microprocessor 22 creates freeze video
data, which is reproduced as video frames for three seconds, by
using the VGA image which has been subjected to the process in step
S227.
[0299] In step S229, the microprocessor 22 stores the VGA image
immediately before the full pressing operation as information for
the header of the video data in the buffer memory 17.
[0300] In steps S230 to S232, the same processes as in steps S20
to S22 in the first embodiment are performed.
Effects, etc. of the Tenth Embodiment
[0301] As describe above, in the tenth embodiment, the same effects
as in the first embodiment can be obtained.
[0302] Further, in the tenth embodiment, the freeze video data
is created from the video data immediately before the full pressing
operation. Accordingly, since it is not necessary to reduce the
size of a high-resolution still image so as to create the freeze
video data, there is an advantage in that processing load is low.
[0303] Next, a reproduction operation on the video file (in which
the video data and freeze video data are connected to one another)
created in the embodiments described above will be described.
[Example of a Reproduction Screen]
[0304] FIG. 15 is a view illustrating a display screen (including
a half-tone image on a display).
[0305] The display screen is created in the image display unit
24 of the digital camera 11 and displayed on an external monitor
connected to the digital camera 11. Alternatively, an external computer
or a video reproduction device may fetch a file group created in
the digital camera 11 through a communication medium or a recording
medium to generate and display the display screen shown in FIG.
15.
[0306] Hereinafter, the display screen and an operation on the
display screen will be described.
[0307] The display screen shown in FIG. 15A displays a reproduction
screen 100, a thumbnail 101, operation icons 102 and 104, and a
shooting date 106.
[0308] The reproduction screen 100 displays a main reproduced image,
and displays a still image included in a header of the video file
in a default condition.
[0309] In this state, if a user clicks on the reproduction screen
100 or a reproduction icon 105 or presses a reproduction button
of the digital camera 11, a video recorded during a half press or
the like is reproduced on the reproduction screen 100. Then, freeze
video is displayed on the reproduction screen 100.
[0310] If the user does not operate at all, new video files are
sequentially reproduced in the order of a file name or a shooting
date.
[0311] On the other hand, if the user clicks on the reverse icon
102 or the scroll-up icon 104 or operates a reproduction control
button (not shown) of the digital camera 11 while the reproduction
screen 100 is focused and selected, still images displayed on the
reproduction screen 100 are switched in the order of shooting dates.
[0312] The thumbnail 101 displays a thumbnail of a still image
of a video file. Under a state in which the thumbnail 101 is focus-selected,
if the reverse icon 102 or the scroll-up icon 104 is operated, it
is possible to scroll a row of thumbnails 101 left and right. In
this state, by clicking on the thumbnail 101 to select it, a still
image selected by the clicking is displayed on the reproduction
screen 100.
[0313] On the other hand, FIG. 15B is a view illustrating a book
type display screen. The book type display screen displays a date
206, a reproduction screen 200, page advancing icons 202 and 204,
and a reproduction icon 205 on left and right pages.
[0314] By clicking on the page advancing icons 202 and 204, first
a page advancing animation and next the following new pages are
displayed. On the new pages, new still images are displayed in the
order of shooting dates thereof.
[0315] In this state, when the reproduction icon 205 is clicked,
a video is reproduced on the left page first, and then after completion
of the reproduction on the left page, a video is reproduced on the
right page.
[0316] Further, at video reproduction on an external monitor connected
with the digital camera 11, the video file may be reproduced by
pressing the reproduction button of the digital camera 11 once and
the still image may be reproduced by pressing the reproduction button
of the digital camera 11 twice (double click).
Supplement to the Embodiments
[0317] Further, in the seventh embodiment, when the time of buffering
the video data is shorter than the third threshold value, the video
data is not recorded, thereby making it possible to avoid storing
short, useless video data (refer to steps S115 and S116 in FIG.
7). This function is not limited to only the seventh embodiment,
but it is preferable to be also applied to the first to third embodiments
and the fifth to tenth embodiments.
[0318] Furthermore, in the seventh embodiment, when the video data
being buffered has a value darker than the first threshold value,
the video data is not recorded, but only the sound data during the
period of time is recorded (refer to steps S99 and S100 in FIG.
7). This function is also not limited to only the seventh embodiment,
but it is preferable to be also applied to the first to third embodiments
and the fifth to tenth embodiments.
[0319] Furthermore, in the ninth embodiment, the video read out
in the draft mode (low resolution reading mode) is enlarged to a
simple high-vision pixel size to be thus interpolated, and the still
image read out in an overall pixel reading mode is reduced to the
simple high-vision pixel size. This function is also not limited
to only the ninth embodiment, but it is preferable to be also applied
to the first to third embodiments and the fifth to tenth embodiments.
[0320] In addition, in the first to tenth embodiments described
above, preferably, the following operations are performed.
[0321] (1) Strobe flash is illuminated onto only a still image.
[0322] (2) Sensitivity changes between a video and a still image.
A charge storage time changes between a video and a still image.
[0323] (3) Illumination to reduce a red eye effect is not performed
during a video shooting.
[0324] (4) Noise removing operation is performed for only a still
image.
[0325] (5) When the recording resolution of a still image is lower
than a VGA, a video is not created.
Principles of the Embodiments
[0326] Principles of the embodiments will be described so that
the embodiments can be easily applied to a different embodiment.
[0327] (1) In the embodiments, still images are created by controlling
an image capturing unit, and a video file (freeze video data) in
which the still images are reproduced during a predetermined period
of time is created. The freeze video data can be reproduced in the
same manner as a typical video by means of a video-dedicated reproduction
device. Therefore, even with the video-dedicated reproduction device,
it is possible to reliably and easily reproduce still images.
[0328] (2) Further, preferably, the freeze video data is to be
in a data format in compliance with predetermined video file specifications.
In this case, it is possible to reliably and easily reproduce the
still images by using a general-purpose video reproduction device
based on the video file specifications.
[0329] (3) Furthermore, in the embodiments, preferably, the sound
data during the still image shooting is added to the video data
for reproducing the freeze video data in synchronization with sound.
By using the freeze video data, both the still image and the sound
during the still image shooting can be reproduced at the same time,
which makes it possible to enjoy even more realistic still images.
[0330] (4) Furthermore, a typical video shooting may be done at
a timing preceding to still image shooting so as to create video
data. At this time, preferably, the preceding video data and the
subsequently captured freeze video data are connected to one another
to be edited in the order so that they can be organized as one file.
[0331] For the video file in which the preceding video data and
the subsequently captured freeze video data are connected, correlation
reproduction between the video and the still image can be implemented
without a need of a link file disclosed in Japanese Unexamined Patent
Application Publication No. 2002-300445.
[0332] (5) Furthermore, the typical video shooting may be done
at a timing subsequent to the still image shooting so as to create
the video data. At this time, preferably, the preceding still image
data and the subsequently captured freeze video data are connected
to one another to be edited in the order so that they can be organized
as one file.
[0333] For the video file, the correlation reproduction between
the video and the still image can be implemented without a need
of the link file disclosed in Japanese Unexamined Patent Application
Publication No. 2002-300445.
[0334] (6) Furthermore, in the embodiments, preferably, the sound
effect data is added to a portion at which the freeze video data
reproduction and the video data reproduction are switched. Thereby,
it is possible to create a video file added with image enhancer,
making visually noticeable the switching from/to a still image to/from
a video during the video reproduction.
[0335] (7) Furthermore, in the embodiments, preferably, an effective
switching image is inserted into a portion where the switching between
the freeze video data and the video data reproduction is done. Thereby,
it is possible to create a video file added with the image enhancer,
such as a clear switching from the static image to the dynamic image
or from the dynamic image to the static image while the video is
reproduced.
[0336] (8) However, if the resolutions of the typical video data
and the freeze video data are different from each other, a switch
of the display resolutions frequently occurs while both the data
is reproduced. As a result, a smooth switch from the video to the
freeze video or from the freeze video to the video is obstructed.
[0337] Accordingly, in the embodiments, preferably, the low resolution
reading operation is performed by the image capturing unit so as
to create the video data, and the still image obtained by performing
high resolution reading operation is resolution-converted so as
to create the freeze video data. Thereby, the display resolutions
of both types of the data items become close to each other, so that
it is possible to avoid the switch of the display resolutions or
to make it visually unrecognizable.
[0338] (9) Furthermore, it is preferable to increase, by a pixel
interpolation, the number of pixels of the video data which has
been read with the low resolution as well as to convert a resolution
of the still image which has been read with the high resolution.
Through this processing, the display resolutions of both the video
data and still image approach to each other, and the change in the
display resolutions is avoidable or visually unrecognizable.
[0339] (10) In the embodiments, the still image is rotationally
converted according to the shooting position in the digital camera.
The digital camera stores the rotationally converted still images
in a video frame, thereby creating the freeze video data.
[0340] For example, in the case of a Motion JPEG format, the rotationally
converted still images are copied and sequentially stored in a plurality
of video frames. In addition, when the estimated difference between
frames is used as in the MPEG format, the rotationally converted
still images are copied and stored in a plurality of I pictures,
and information indicating that the estimated difference between
frames is zero is stored in an intermediated P or B picture.
[0341] In such video specifications, it only has to rotationally
convert the still image only once.
[0342] Therefore, even with the rotational conversion in the digital
camera, an increase of a processing cost falls within a negligible
range.
[0343] Furthermore, the freeze video data can be reproduced in
the same manner as a typical video by using a video reproduction
device. In particular, the freeze video data captured in the vertical
position can also be reproduced in the vertical position without
performing any special operation in the video reproduction device.
[0344] (11) Further, in the embodiments, preferably, the still
image is rotationally converted, such that the number of pixels
of a still image in a direction of a long side of a frame is smaller
than the number of pixels of the still image in a direction of a
short side thereof.
[0345] In this case, the screen size (the number of vertical and
horizontal pixels) after the rotational conversion is not larger
than the screen size before the rotational conversion. Therefore,
a still image in vertical position can be displayed in a screen
adjusted to the horizontal-position screen size without expanding
a vertical-position image, without performing any special operation
in the video reproduction device.
[0346] (12) Furthermore, in the embodiments, preferably, a predetermined
size-adjusting image is added outside a frame of the rotationally
converted still image, thereby maintaining a horizontal-position
screen aspect ratio.
[0347] In this case, the video reproduction device can reproduce
the vertical-position image as the horizontal-position image without
performing any special aspect conversion process.
[0348] (13) Furthermore, in the embodiments, the freeze video data
for reproducing still images during a predetermined period of time
is created and a plurality of freeze video data items are connected,
thereby creating a video file.
[0349] By creating the special video file, it is possible to reliably
and easily perform the automatic slide reproduction even with a
video-dedicated reproduction device.
[0350] (14) Furthermore, in the embodiments, it is preferable to
create an image to be displayed as one of options to reproduce and
store it in a video file as a chapter menu.
[0351] Thereby, in the reproduction device, by using a function
of the chapter menu, the still images can be displayed as the option.
As a result, a user selects a desired still image so as to start
the automatic slide reproduction from the still image.
[0352] (15) Furthermore, in the embodiments, it is preferable to
create an image to be displayed as one of the options to reproduce
from a still image with a different date from that of an immediately
preceding still image, and store it in the video file as a chapter
menu.
[0353] Thereby, in the reproduction device, by using the function
of the chapter menu, the still image with a different date from
that of an immediately preceding still image can be displayed as
one of the options. As a result, a user selects a desired still
image so as to start the automatic slide reproduction from the still
image of a desired shooting date.
[0354] (16) Furthermore, in the embodiments, preferably, shooting
date information is inserted in a portion where freeze video data
items whose shooting dates are different are connected to one another.
In this case, during the automatic slide reproduction, it is possible
to see where the shooting date changes by the information display.
[0355] (17) Furthermore, in the embodiments, preferably, identification
information for specifying the still image file is stored in the
video file. In this case, during the automatic slide reproduction,
it is possible to distinguish the still image file according to
the identification information.
[0356] (18) Furthermore, in the embodiments, the digital camera
starts buffering the video when the first start signal is input.
In this state, if the second start signal that instructs the still
image shooting is input, the video being buffered is stored.
[0357] In addition, if the first start signal is cancelled without
the second start signal inputted, the digital camera does not store
the video being buffered but releases it.
[0358] As such, in the operation mode, unnecessary video data can
be easily discarded by releasing the first start signal. As a result,
with a precise and reasonable shoot operation, it is possible to
avoid a disadvantage in that unnecessary videos are stored in a
recording medium.
[0359] (19) Furthermore, in the embodiments, preferably, the first
start signal is output upon a press to a release button halfway,
the first start signal is cancelled upon the release of the half
press, and the second start signal is output upon a full press to
the release button.
[0360] In this case, the video being buffered can be released by
releasing the half press operation. Thereby, with a precise and
reasonable shoot operation, it is possible to avoid storing unnecessary
videos in a recording medium every time the half pressing operation
is repeated.
[0361] (20) Furthermore, in the embodiments, the first start signal
may be output if the framing is detected to be stable, and the first
start signal may be cancelled if the framing is detected to be unstable.
[0362] In general, a user decides the picture composition before
a still image is shot (that is, before the second signal is input)
so as to make the framing stable. Since the video shooting starts
in this state, it is possible to reliably video-shoot the shape
of a photographic subject immediately before the still image is
shot.
[0363] By using such a function, even though the user is poor at
the half pressing operation on the release button, it is possible
to definitely start the video buffering operation only by making
the framing of a camera stable. In addition, the determination on
the framing may be made by detecting oscillation of the camera or
a lens or by detecting the movement of a monitor screen or the like.
[0364] (21) Further, the video buffering operation may start when
a self-timer starts to work. In this case, it is possible to store,
as videos, various scenes happening in front of a digital camera
while the self-timer works.
[0365] (22) Furthermore, preferably, if it is determined that a
transition period of time from the first start signal to the second
start signal is shorter than a threshold value, the video is not
stored. In this case, when the still image is shot in a hurry (for
example, when the release button is fully pressed at once), the
recorded video can be removed. As a result, with a precise and reasonable
shooting operation, it is possible to avoid a problem that momentary,
useless videos are accumulated in a recording medium.
[0366] (23) On the other hand, it is preferable to stop shooting
a video or stop storing the video when the video to shoot is determined
to be dark. This can eliminate storage of a dark video such as one
shot in a dark place without the flash. As a result, with a precise
and reasonable shooting operation, it is possible to avoid a problem
that dark, useless videos are accumulated in the recording medium.
[0367] (24) Further, when it is determined that the video is dark,
a sound portion of the video may be stored. In this case, it is
more preferable to store the sound only when the sound level is
higher than a predetermined level.
[0368] Thereby, even in a condition which is not suitable for the
video shooting, it is possible to realistically record the place
with the sound.
[0369] (25) Furthermore, the freeze video in which still images
are reproduced for a predetermined period of time may be created.
In this case, it is possible to make the video and the still image
as one file by connecting the video and the freeze video in a reproduction
order. In this case, by reproducing the video file reversely, it
is possible to enjoy the video portion and the still image portion
in the order. In addition, since the video and the freeze video
are arranged as one file, a file arrangement in a recording medium
becomes easy.
[0370] (26) Further, it is preferable that upon an input of the
first start signal a shooting preparation is performed, and thereafter
the video buffering operation starts. According to the operation
sequence, it is possible to perform the video shooting at a good
photographic subject image for which the shooting preparation has
been completed.
[0371] The invention is not limited to the above embodiments and
various modifications may be made without departing from the spirit
and scope of the invention. Any improvement may be made in part
or all of the components. |