JP2002320189A - Digital camera, method for reproducing dynamic image and method for recording dynamic image - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reproduce and display in real time by regulating the frame rate, without placing a large load on the circuit of a control system. SOLUTION: A digital camera comprises a flash memory 28 for recording dynamic image data having a plurality of static image data continuous over a time; a display unit 25 for displaying the dynamic image data recorded in the memory 28; and a CPU 21 for counting a time required from the reading of the static image data of one frame for constituting the dynamic image data which are recorded in the memory 28, until displaying of the data on the unit 25. Then the CPU conducts calculating the number of thinnings between the frames, when the dynamic image data recorded in the memory 2 are displayed on the unit 25 by the obtained time and the frame rate of the dynamic image data recorded in the memory 28, thinning between the frame of the dynamic image data recorded in the memory 28 based on the calculated number of thinning between the frames, and displaying the data on the unit 25, in real time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a digital camera for recording / reproducing a moving image on a recording medium such as a memory card, a moving image reproducing method, and a moving image recording method.

[0002]

2. Description of the Related Art Recently, not only a digital video camera but also a digital still camera records a moving image data file composed of a plurality of still images continuous in time series on a memory card such as a flash memory. There are many things that can play back video data files recorded on cards.

In this type of digital still camera,
The moving image data file handles a plurality of temporally continuous still images as one data file, and does not handle a common video signal according to a predetermined television system such as NTSC.

Accordingly, the number of pixels, frame rate, etc. of one still image constituting a moving image are usually different depending on the type of digital still camera, and a memory card storing moving image data files between the own model and another model. Even if the camera itself is compatible, especially if the other model has higher performance, read the video data file shot by the other model from the memory card and Cannot be reproduced and displayed in real time.

[0005] JP-A-7-193786, JP-A-1
And JP-A-11-327513.
Each of these publications describes a technique for thinning out frames of an image to be displayed when reproduction and display processing of a moving image cannot be performed in synchronization with real time as in shooting.

[0006]

The techniques described in the above publications correspond to all the still images constituting a moving image and reduce the time required for the reproduction display processing and the real time for each frame. A comparison process for comparing the synchronized playback time is executed to determine whether or not to perform frame thinning and, if so, how many frames to thin.

Therefore, when reproducing such a moving image, the CPU which controls the operation of each circuit must continuously execute the above-described processing regarding the frame thinning from beginning to end. Was.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to adjust a frame rate without imposing a large burden on a control system circuit and to reproduce and display a moving image in real time. To provide a digital camera, a moving image reproducing method, and a moving image recording method capable of performing the following.

[0009]

According to the first aspect of the present invention,
A recording medium recording moving image data composed of a plurality of temporally continuous still image data, a display unit for displaying moving image data recorded on the recording medium, and moving image data recorded on the recording medium Using a part of the still image data among the plurality of still image data constituting the still image data to time the time required to display the still image data on the display unit; and Determining still image data to be displayed on the display unit among a plurality of still image data constituting the moving image data recorded on the recording medium based on the frame rate of the moving image data recorded on the recording medium; Display control means for displaying the moving image data in real time on the display unit using data.

With such a configuration, the frame thinning number required to display the entire moving image data in real time is obtained from the time required to reproduce one frame of still image data. Moving image data can be reproduced and displayed in real time while minimizing the load on the circuit.

According to a second aspect of the present invention, in the first aspect of the present invention, the timing means performs timing using one frame of still image data located at the beginning of the moving image data. I do.

With such a configuration, in addition to the operation of the first aspect of the present invention, the display processing of the leading still image data is completed at the time when the time measurement is completed. It is possible to shift to the processing from the still image data to be constituted.

According to a third aspect of the present invention, in the first aspect of the present invention, the time measuring means includes a part of a plurality of frames in a plurality of still picture data constituting the moving picture data recorded on the recording medium. The time required for display on each of the display units is measured using the still image data, and an average value of the measured results is obtained as a time corresponding to one frame.

With this configuration, in addition to the operation of the first aspect of the present invention, the frame decimation factor required for displaying the entire moving image data in real time can be obtained more accurately, and the moving image data can be obtained. Reproduction and display can be reliably performed in real time.

According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the time required for displaying the still image data on the display unit is the time required for displaying the still image data from the recording medium. It includes at least one of a time required for reading and a time required for decompressing the still image data.

According to such a configuration, claims 1 to 3 are provided.
In addition to the effect of the invention described in any one of the above, the frame decimation factor required for displaying the moving image data in real time can be more accurately obtained, and the moving image data can be reliably reproduced and displayed in real time.

According to a fifth aspect of the present invention, there is provided an image capturing means, a recording medium for recording moving image data composed of a plurality of temporally continuous still image data obtained by the image capturing means, and the image capturing means. Timer means for counting the time required from when the still image data is photographed using a part of the plurality of still image data constituting the moving image data to when the still image data is recorded on the recording medium; and And recording control means for recording moving image data of a frame rate based on the time obtained in the above recording medium on the recording medium.

With this configuration, the drive interval of the image pickup means required to record the moving image data in real time is obtained from the time required to record the still image data for one frame. The load on the system circuit can be minimized, and moving image data can be recorded in real time without unnecessary driving of the imaging unit.

According to a sixth aspect of the present invention, there is provided a moving image reproducing method for reading moving image data composed of a plurality of temporally continuous still image data from a recording medium and displaying the moving image data on a display unit. A time counting step of counting the time required until the still image data is displayed on the display unit using a part of the still image data among the plurality of still image data constituting the moving image data recorded in the moving image data; Still image data to be displayed on the display unit among a plurality of still image data constituting the moving image data recorded on the recording medium based on the time obtained in and the frame rate of the moving image data recorded on the recording medium. And displaying the moving image data in real time on the display unit using the still image data.

According to this method, the frame thinning number required to display the entire moving image data in real time is obtained from the time required to reproduce the still image data for one frame. Moving image data can be reproduced and displayed in real time while minimizing the load on the circuit.

According to a seventh aspect of the present invention, there is provided a moving picture of a digital camera comprising an image pickup means and a recording medium for recording moving picture data composed of a plurality of temporally continuous still picture data obtained by the image pickup means. A recording method, comprising: photographing still image data using a part of still image data among a plurality of still image data constituting moving image data obtained by the imaging unit, and recording the still image data on the recording medium. A time measuring step for measuring a required time; and a recording control step of recording moving image data having a frame rate based on the time obtained in the time measuring step on the recording medium.

According to this method, the drive interval of the image pickup means required to record the moving image data in real time is obtained from the time required to record one frame of still image data. The load on the system circuit can be minimized, and moving image data can be recorded in real time without unnecessary driving of the imaging unit.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) A first embodiment in which the present invention is applied to a digital camera will be described below with reference to the drawings.

FIG. 1 shows the circuit configuration, and reference numeral 10 denotes a digital camera. The digital camera 10 can set a recording mode and a reproduction mode. In the recording mode state, the digital camera 10 has a CC disposed behind the lens 11.
D12 is scanned and driven by a timing generator (TG) 13 and a vertical driver 14, and outputs a photoelectric conversion output for one screen at regular intervals.

The photoelectric conversion output is appropriately adjusted in gain for each of the RGB primary color components in the state of an analog value signal, then sampled and held by a sample and hold (S / H) circuit 15, and is subjected to an A / D converter 16. Are converted into digital data, and color processing including pixel interpolation is performed by the color processing circuit 17 to generate a luminance signal Y and color difference signals Cb and Cr of digital values, and the DMA (Dir)
ect MemoryAccess) controller 18
Is output to

The DMA controller 18 outputs a luminance signal Y and color difference signals Cb and C output from the color process circuit 17.
r is DMA-transferred to the DMA area of the DRAM 20 via the DRAM interface (I / F) 19.

The CPU 21 controls the operation of the entire digital camera 10. After the DMA transfer of the luminance and color difference signals to the DMA area of the DRAM 20 is completed, the CPU 21 transmits the luminance and color difference signals to the DRAM 20 via the DRAM interface 19. The data is read from the DMA area and written to the VRAM 23 via the VRAM controller 22.

A digital video encoder (hereinafter abbreviated as "video encoder") 24 periodically reads out the luminance and chrominance signals from the VRAM 23 via the VRAM controller 22, and generates a video signal based on these data. Output to the display unit 25.

The display unit 25 is composed of, for example, a color liquid crystal display panel with a backlight and a driving circuit thereof.
It is located on the back side of the camera body,
VF (Electronic View Find)
r: an electronic view finder) that performs display based on a video signal from the video encoder 24 to display a through image based on image information fetched from the VRAM controller 22 at that time. Become.

In the state where the image at that time is displayed on the display unit 25 in real time as a monitor image, the key input unit 26 is operated at the timing when it is desired to record and save.
By operating the shutter key among the keys constituting the
Generate a trigger signal.

If still image shooting is set, the CPU
Reference numeral 21 denotes the CCD 12 at that time in response to the trigger signal.
DRA of luminance and color difference signals for one screen captured from
Immediately after the end of the DMA transfer to the DMA area of M20, C
The path from the CD 12 to the DRAM 20 is stopped, and the state transits to the state of recording and saving.

In the state of recording and storing the still image data,
The CPU 21 converts the luminance and chrominance signals for one frame written in the DRAM 20 via the DRAM interface 19 into a unit called a basic block of 8 × 8 pixels for each of Y, Cb, and Cr components. The data is read out and written into the JPEG circuit 27.
DCT (Adaptive Discrete Cos)
data compression is performed by processing such as ine transform (adaptive discrete cosine transform) and Huffman coding which is an entropy coding method.

The CPU 21 uses the JPEG circuit 27 as a data file with the code data obtained by the data compression.
And writes the data in a flash memory 28 which is a non-volatile memory which is detachably mounted as a storage medium of the digital camera 10.

When moving image shooting is set, C
The PU 21 responds to the trigger signal by the operation of the shutter key and transmits the luminance and color difference signals for one frame written in the DRAM 20 to the DRAM interface 19 without stopping the path from the CCD 12 to the DRAM 20.
, And read out in a unit called a basic block of 8 pixels by 8 pixels for each component of Y, Cb, and Cr, and writes it to the JPEG circuit 27. The JPEG circuit 27 adopts the ADCT and entropy coding method. Data is compressed by processing such as Huffman coding.

The CPU 21 reads the code data obtained by the data compression from the JPEG circuit 27 and
The data is temporarily stored in the storage area of the DRAM 20 via the interface 19.

After the image is picked up by the CCD 12, the DR
A series of processing up to the storage in the storage area of the AM 20 is processing for a still image of one frame constituting a moving image. When this processing is completed, the CPU 21 still operates the shutter key continuously. , And waits for the image of the next frame to be transferred from the CCD 12.

As described above, while the shutter key is operated, the same processing is continued for each frame, and the shutter key is released (or the DRAM 20 is full).
At this point, the CPU 21 transfers the still image data for a plurality of frames stored in the storage area of the DRAM 20 into the moving image data of a predetermined format to the flash memory 28, And record the information.

At the time of writing the moving image data into the flash memory 28, the CPU 21 also creates image data in which the number of constituent pixels of the first still image data among the plurality of still image data forming the moving image file is significantly thinned out. This is stored in the flash memory 28 in association with the original moving image data as a preview image.

In the above embodiment, the JPE
DRA code data compressed by the G circuit 27
M20 is sequentially stored in the storage area, but a still image in the state of uncompressed luminance and color difference signals is stored in the DRAM 2.
0, and when it is determined that the shutter key is released (or the DRAM 20 is full), a plurality of still image data stored in the storage area of the DRAM 20 are sequentially stored in the JPEG circuit. The data may be compressed using the flash memory 27 and written into the flash memory 28.

In some moving image data formats, only a fixed frame rate can be set in one moving image data file. Therefore, when the shutter key is operated, the time required for a series of processing for each frame is calculated in advance, and while the processing of the still image data is being performed for each frame, the image data obtained by the CCD 12 Sample hold circuit 15, A / D converter 16
By restricting the driving of the CCD 12 so as not to be transferred to the color process circuit 17 via the, the moving image data can be reproduced at a constant frame interval.

At this time, the time interval for requesting the transfer of image data from the CCD 12 to the color process circuit 17 is as follows.
It cannot be changed until the recording of the moving image data in the flash memory 28 is completed.

The key input section 26 has a recording (REC) mode and a reproduction (PL) mode in addition to the shutter key.
AY) Recording / replay mode switching key for switching between modes, mode key for selecting various shooting modes, and instructing up, down, left, and right directions for image selection and designation of a point of importance adjustment in a white balance screen. It is composed of a cursor key and an “Enter” key for deciding the content of selection, and a signal accompanying the key operation is directly sent to the CPU 21.

In the reproduction mode, the flash memory 28
When reproducing the still image data recorded in the
1 stops the path from the CCD 12 to the DRAM 20 and operates the CPU 2 in response to an operation of an image selection key or the like of the key input unit 26.
1 reads out one specific frame of code data from the flash memory 28 and writes it into the JPEG circuit 27,
The VRAM controller 2 is provided for each basic block of 8 × 8 pixels obtained by performing the expansion processing in the G circuit 27.
2, the luminance and color difference signals for one frame are developed and stored in the VRAM 23.

On the other hand, the video encoder 24
A video signal is generated based on the luminance and color difference signals for one frame which are developed and stored in the RAM 23 and displayed on the display unit 25.

Next, the operation of the above embodiment will be described.

FIGS. 2 and 3 mainly show the contents of processing by the CPU 21 when reading and reproducing moving picture data recorded in the flash memory 28 in another reproduction mode in the reproduction mode.

In this figure, when the shutter key is operated in a state where desired moving image data is temporarily selected, the reproduction and display of the moving image data is started. At the beginning of the processing, the operation waits until the shutter key is operated. (Step A01).

When it is determined that the shutter key has been operated, first, each parameter value of the moving image data file, specifically, "all reproduction time" and "frame rate" are read (step A02).

Next, "start frame number" and "end frame number" are set as frames for reproducing a moving image (step A03).

Thus, the reproduction time is calculated by the following expression: reproduction time = (end frame number−start frame number + 1) ×
This is performed at the frame rate (step A04).

Then, an initial value "1" is set to a frame number pointer (hereinafter referred to as "frame pointer") i (step A05), and the counting of the basic timer of the CPU 21 is started (step A06). The i-th frame of the moving image data according to the pointer i,
Here, the first still image data of the first frame is read from the flash memory 28 (step A07), and JP
The EG circuit 27 performs a decompression process reverse to that at the time of recording and decodes the decoded data (step A08).
The luminance and chrominance signals for one frame are expanded and stored in the VRAM 23 via the controller 22, and the corresponding video signals are generated by the video encoder 24, and the display unit 25
Is displayed (step A09).

When the first one frame of the still image is displayed in this way, the time counting by the basic timer is stopped (step A10), and 1
The time t required from the reading of the still image data of the frame from the flash memory 28 to the display thereof is 1 constituting this moving image data calculated from the frame rate.
It is determined whether or not it is longer than the display time interval ft of the still image for the frame (step A11).

This is for determining whether or not the moving image data recorded in the flash memory 28 can be reproduced in real time at the set frame rate.

If it is determined in step A11 that the time t is shorter than the time ft, the recorded moving image data can be displayed in real time at the same frame rate. A numerical value "1" indicating that frame thinning is not performed is input and set (step A12).

In step A11, time t is equal to time ft.
If it is determined that the moving image data recorded in the flash memory 28 cannot be reproduced in real time according to the set frame rate,
Since the moving image data is recorded by another digital camera, a minimum natural number n that satisfies “t ≦ n × ft” is calculated (step A1).
3).

Thus, the above-mentioned step A12 or A1
Using the value n obtained in step 3, the playback timer that cyclically measures the display time per frame during the playback of the moving image has the time “n”.
.Times.ft "(step A14), immediately start it (step A15), and stop while waiting for an interrupt from the timer after the time" nxft "set by the timer has elapsed. The display of the image is continued (step A16).

When it is determined in step A16 that an interruption from the reproduction timer has occurred, the frame pointer i is updated to "+ n" (step A17).
It is confirmed whether there is a corresponding frame by checking whether the value of the frame pointer i updated and set does not exceed the end frame number (step A18).

Thereafter, the still image data of the i-th frame of the moving image data is read from the flash memory 28 in accordance with the value i of the frame pointer (step A19), and JP
The EG circuit 27 performs an expansion process and decodes the data (step A20). The obtained still image data is expanded and stored for one frame in the VRAM 23, and displayed on the display unit 25 (step A21). Back,
It waits for the time “n × ft” to elapse and for the timer to interrupt.

By repeating the processing of steps A16 to A21 in this way, the moving image display with the frame pointer updated and set n by n is continued.

FIG. 4 exemplifies the reproduction and display state of such moving image data. Numerals surrounded by parallelograms shown in FIG. 4A indicate individual moving image data recorded in the flash memory 28. It represents the frame number of the still image data.

In this case, the display time interval per frame at the original frame rate recorded in the flash memory 28 is ft, and as shown in FIG. Flash memory 28
, And decoded by the JPEG circuit 27,
Assuming that the time required until the data is stored in the storage unit 23 and displayed on the display unit 25 is t, here, "t>ft" is clearly.

Therefore, here, “3” is calculated as the minimum natural number n that satisfies “t ≦ n × ft”, and while the first frame is displayed for the period of “3 × ft”, The still image data of the fourth (= 1 + 3) frame is read from the flash memory 28, decoded by the JPEG circuit 27, and then processed for display. This time, the still image data of the fourth frame is processed for a period of “3 × ft”. While displaying only the image data, the still image data of the seventh (= 4 + 3) th frame is read out from the flash memory 28, decoded by the JPEG circuit 27, and processed for display. By executing, the reproduction and display can be performed in the same real time as the moving image data recorded in the flash memory 28.

In this case, since n = 3, the frame thinning number is 2 (= n-1), and two frames out of three frames are thinned and are not used for reproduction display.

When the value of the frame pointer i updated and set in step A18 exceeds the end frame number and it is determined that there is no corresponding frame, the real-time reproduction display of the moving image data in the reproduction mode is performed. This processing ends.

As described above, the frame decimation factor required to display the entire moving image data in real time is obtained from the time required to reproduce one frame of still image data, so that the load on the control system circuit is increased. Can be reproduced and displayed in real time while minimizing.

In addition, the measurement of the time required for the reproduction is
Since it is obtained from the still image data of one frame located at the head of the moving image data, the display processing of the head still image data is completed at the time when the time measurement is completed. From the still image data.

In the above embodiment, the frame decimation factor required to display the entire moving image data in real time is obtained from the time required to reproduce only one frame of still image data constituting the moving image data. However, the time required for the reproduction of still image data for a plurality of frames constituting a part of the moving image data, for example, for a few frames, is measured together, and the average value is obtained as the time corresponding to one frame. You may.

In this way, although the load on the CPU 21 and the like is slightly increased as compared with the case where only one frame is obtained, the frame decimation number necessary for displaying the entire moving image data in real time can be obtained more accurately. Thus, it is considered that moving image data can be reliably reproduced and displayed in real time.

In the above-described embodiment, a case has been described in which moving image data recorded in another digital camera and recorded in the flash memory 28 is read out and reproduced. The present invention can be applied to a case where data is reproduced using the same digital camera.

In the above-described embodiment, as a moving image shooting method, still image data is sequentially stored in the DRAM 20 during moving image shooting, and a plurality of still image data stored in the DRAM 20 is read out after the moving image shooting ends. Because the method of writing data to the flash memory 28 is adopted, the photographing time interval becomes shorter than the reproduction time interval, and real-time reproduction cannot be performed unless frame thinning is performed. It is.

Further, in the above embodiment, based on the time “n × ft” obtained by multiplying the original display time interval ft corresponding to one frame of the still image data constituting the moving image data by an integer,
Although it has been described that a moving image is displayed while performing frame thinning with the frame thinning number set to one value “n−1”, as shown in FIG. 5, the moving image is read from the flash memory 28, decoded by the JPEG circuit 27, VRAM23
Each time t elapses, a frame of still image data which is considered to be closest in time is selected from before and after, based on a time t required to be expanded and stored in the display unit 25 and displayed, It may be processed as the next still image data to be displayed.

In this way, the number of frames to be thinned out is not constant, and the load on the CPU 21 and other parts is slightly increased, but more still image data frames corresponding to the time t are selected and displayed in real time. Can be.

(Second Embodiment) Hereinafter, a second embodiment in which the present invention is applied to a digital camera will be described with reference to the drawings.

The circuit configuration is basically the same as that shown in FIG. 1, and the same parts are denoted by the same reference numerals and their illustration and description are omitted.

Next, the operation of the above embodiment will be described.

FIG. 6 is a flowchart mainly showing the operation of the CPU when the moving image shooting is selected in the recording mode and recorded in the flash memory 28.
21 shows the processing contents.

Here, during the shooting of a moving image, after the pressing operation of the shutter key is started and the pressing operation is continued, still image data is successively taken into the storage area of the DRAM 20 and the shutter key operation is released. At this point, the photographing is stopped, and a plurality of still image data taken into the storage area of the DRAM 20 are recorded in the flash memory 28 as one moving image data.

FIG. 6 is a flowchart mainly showing the operation of the CPU when selecting the moving image shooting in the recording mode and recording the moving image in the flash memory 28.
21 shows the contents of the processing by moving the moving image data by operating the shutter key of the key input unit 26 with the moving image recording selected at the beginning. It waits for the key to be operated (step B01).

When it is determined that the shutter key has been operated, first, the timer of the basic timer of the CPU 21 is started (step B02), and the CCD 12 is driven to acquire still image data (step B03).
After storing this in the DMA transfer area of the DRAM 20, 1
When the still image data for the frame is obtained, it is compressed by the JPEG circuit 27 as needed (step B).
04), the obtained code data is converted from the JPEG circuit 27 into the DR
The data is temporarily stored in the storage area of the AM 20, and
At the same time, the obtained code data is written into the flash memory 28 (step B05).

When the writing of the first one-frame still image to the flash memory 28 is completed, the time counting by the basic timer is stopped (step B06), and the one-frame still image data is actually photographed by the CCD 12. , A time t required from when the moving image is stored in the flash memory 28 is obtained as a clock value, and this is set as a recording timer for cyclically measuring the recording time per frame when recording a moving image, and is immediately activated (step B07).

Thereafter, after confirming that the shutter key is still being pressed (step B08), C
The still image data is obtained by driving the CD 12 (step B09). This is stored in the DMA transfer area of the DRAM 20, and when one frame of the still image data is obtained, the still image data is compressed by the JPEG circuit 27 as needed. Then, the obtained code data is temporarily stored in the storage area of the DRAM 20 from the JPEG circuit 27, and is also displayed on the display unit 25 (step B11).

Here, it is confirmed that the time t has elapsed while waiting for an interruption from the recording timer (step B).
12) Then, the process from step B08 is repeated again, and the still image data is continuously photographed at intervals of the time t while the shutter key is pressed.

When it is determined in step B08 that the shutter key has not been pressed and the shooting of the moving image has been stopped, a plurality of temporally consecutive still images stored in the storage area of the DRAM 20 are determined. The data is collected as one moving image data, and various parameters and the like are attached and recorded in the flash memory 28 (step B13). Thereafter, the process returns to the step B01 again to prepare for the next moving image photographing.

In this case, the parameter values attached to the moving image data include “all playback time” and “frame rate”. In addition to the parameter values, the number of constituent pixels from the still image data located at the beginning is greatly increased. The thinned image data is created, attached to the original moving image data as a preview image, and stored in the flash memory 28.

As described above, the drive interval of the image pickup means necessary for reproducing the moving image data in real time is obtained from the time required for recording one frame of still image data. The load to be applied is minimized, and the processing such as frame thinning described in the first embodiment is performed at the time of reproducing a moving image without unnecessary driving of the imaging unit or unnecessary increase of the recording capacity of the recording unit. The moving image data can be reproduced in real time without any processing.

In general, with the same type of digital camera,
In the playback mode, one frame of still image data is read out from the recording medium, decompressed, and compared with the time width required to reproduce and display on the display unit, one frame of the still image data is captured in the recording mode. The time width required for data compression and recording on a recording medium is larger.

Therefore, when the moving image data recorded in the flash memory 28 as described above is to be reproduced and displayed by the digital camera 10 that has recorded the image data or by another digital camera of the same model, By executing the processing described in the second embodiment, the variable n representing the frame thinning rate becomes 1, and it is possible to display in real time without performing any frame thinning.

In the case of the second embodiment, "t
<ft ”, it is possible to display in real time by executing a reproduction process in which the processes of steps A06, A10, A11, and A13 in FIG. 2 are omitted, that is, a normal reproduction process. In addition, the burden on the control system circuit can be reduced as compared with the first embodiment.

Further, in the second embodiment, the time required for recording one frame of still image data is set as the photographing time interval. However, the predetermined frame rate described in the first embodiment is used. D
After storing a plurality of still image data in the RAM 20, the frame thinning rate is determined based on the time required for recording one frame of still image data, and the DR is determined based on the frame thinning rate.
Still image data may be read from the AM 20 while thinning out the frames, and recorded in the flash memory 28.

Further, in the second embodiment, it has been described that the moving image data is photographed while the shutter key of the key input section 26 is continuously pressed, but such a release means is used. Instead, as in a general video camera, the shutter key may be pressed for a short time at each of the start and end of moving image shooting.

In this case, in step B08 of FIG. 6, after confirming that the shutter key has not been operated, the process proceeds to step B09 and the subsequent steps. When it is determined that the shutter key has been pressed, the process proceeds to step B13. Then, the process of recording moving image data in the flash memory 28 is executed.

In addition, the present invention is not limited to the above-described embodiment, and can be variously modified and implemented without departing from the gist thereof.

Further, the above embodiments include inventions at various stages, and various inventions can be extracted by appropriately combining a plurality of disclosed constituent features. For example, even if some components are deleted from all the components shown in the embodiments, at least one of the problems described in the column of the problem to be solved by the invention can be solved and the effects described in the column of the effect of the invention can be solved. In a case where at least one of the effects described above is obtained, a configuration in which this component is deleted can be extracted as an invention.

[0094]

According to the first aspect of the present invention, a frame thinning number necessary for displaying the entire moving image data in real time is obtained from the time required for reproducing one frame of still image data. The moving image data can be reproduced and displayed in real time while minimizing the load on the control system circuit.

According to the second aspect of the present invention, in addition to the effect of the first aspect of the present invention, since the display processing of the head still image data is completed at the time when the time measurement is completed, the moving image can be promptly obtained. It is possible to shift to processing from the subsequent still image data constituting the data.

According to the third aspect of the present invention, in addition to the effect of the first aspect of the present invention, it is possible to more accurately obtain the frame decimation number necessary for displaying the entire moving image data in real time, Data can be reliably reproduced and displayed in real time.

According to the fourth aspect of the present invention, in addition to the effect of the first aspect of the present invention, a frame thinning number required for displaying the moving image data in real time can be obtained more accurately. Thus, the moving image data can be reliably reproduced and displayed in real time.

According to the fifth aspect of the present invention, the drive interval of the imaging means necessary for recording the moving image data in real time is obtained from the time required for recording one frame of still image data. In addition, the load on the control system circuit can be minimized, and moving image data can be recorded in real time without unnecessary driving of the imaging unit.

According to the sixth aspect of the present invention, the frame thinning number required to display the entire moving image data in real time is obtained from the time required to reproduce one frame of still image data. Moving image data can be reproduced and displayed in real time while minimizing the load on the system circuit.

According to the seventh aspect of the present invention, the drive interval of the imaging means necessary for recording the moving image data in real time is obtained from the time required for recording the still image data for one frame. In addition, the load on the control system circuit can be minimized, and moving image data can be recorded in real time without unnecessary driving of the imaging unit.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a circuit configuration of a digital camera according to a first embodiment of the present invention.

FIG. 2 is an exemplary flowchart showing processing content when reproducing moving image data according to the embodiment;

FIG. 3 is an exemplary flowchart showing processing content when reproducing moving image data according to the embodiment;

FIG. 4 is an exemplary view showing an example of a state of frame thinning during reproduction of moving image data according to the embodiment;

FIG. 5 is a view exemplifying another frame thinning-out state at the time of reproducing moving image data according to the embodiment;

FIG. 6 is a flowchart showing processing content when recording moving image data according to the second embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Digital camera 11 ... Lens 12 ... CCD 13 ... Timing generator (TG) 14 ... Vertical driver 15 ... Sample hold circuit (S / H) 16 ... A / D converter 17 ... Color process circuit 18 ... DMA controller 19 ... DRAM interface (I / F) 20 DRAM 21 CPU 22 VRAM controller 23 VRAM 24 (digital) video encoder 25 Display unit 26 Key input unit 27 JPEG circuit 28 Flash memory

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) H04N 5/907 H04N 101: 00 5/92 5/91 J // H04N 101: 00 5/92 HF term (reference) 2H054 AA01 BB11 2H104 AA12 AA16 5C022 AC21 AC42 AC54 AC69 5C052 AA17 DD10 GA01 GA03 GC05 GD03 GD08 GE06 GE08 5C053 FA07 FA27 GA11 GB36 KA01 KA24 KA25 LA01 LA06

Claims (7)

[Claims] 1. A recording medium for recording moving image data composed of a plurality of temporally continuous still image data, a display unit for displaying moving image data recorded on the recording medium, A timer means for measuring a time required for displaying the still image data on the display unit by using a part of the still image data among the plurality of still image data constituting the recorded moving image data; and Based on the obtained time and the frame rate of the moving image data recorded on the recording medium, the still image data to be displayed on the display unit among a plurality of still image data constituting the moving image data recorded on the recording medium is determined. A display control means for displaying the moving image data on the display unit in real time using the still image data. 2. The digital camera according to claim 1, wherein said timing means performs timing using one frame of still image data located at the beginning of said moving image data. 3. The method according to claim 1, wherein the timing means uses a part of a plurality of frames of still image data of the plurality of still image data constituting the moving image data recorded on the recording medium to display the still image data on each of the display units. 2. The digital camera according to claim 1, wherein a time required for the digital camera is measured, and an average value of the measured results is obtained as a time corresponding to one frame. 4. A time required for displaying the still image data on the display unit is a time required for reading the still image data from the recording medium and a time required for expanding the still image data. The digital camera according to claim 1, wherein the digital camera includes at least one. 5. An image pickup means, a recording medium for recording moving image data composed of a plurality of temporally continuous still image data obtained by the image pickup means, and a plurality of moving image data obtained by the image pickup means A time measuring means for measuring a time required from when the still image data is photographed using a part of the still image data to when the still image data is recorded on the recording medium, based on the time obtained by the time measuring means. And a recording control means for recording moving image data at a frame rate on the recording medium. 6. A moving image reproducing method for reading moving image data composed of a plurality of temporally continuous still image data from a recording medium and displaying the moving image data on a display unit, wherein the moving image data recorded on the recording medium is provided. A time counting step of counting a time required for displaying the still image data on the display unit using a part of still image data among a plurality of still image data constituting Determining still image data to be displayed on the display unit among a plurality of still image data constituting the moving image data recorded on the recording medium based on the frame rate of the moving image data recorded on the recording medium; Displaying the moving image data on the display unit in real time using data. 7. A moving image recording method for a digital camera, comprising: an imaging unit; and a recording medium for recording moving image data composed of a plurality of temporally continuous still image data obtained by the imaging unit. A timer for measuring a time required from when the still image data is photographed using a part of the plurality of still image data constituting the moving image data obtained by the imaging means to when the still image data is recorded on the recording medium. And a recording control step of recording, on the recording medium, moving image data having a frame rate based on the time obtained in the time counting step.