WO2004025957A1 - 動画像記録装置 - Google Patents
動画像記録装置 Download PDFInfo
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- WO2004025957A1 WO2004025957A1 PCT/JP2003/011280 JP0311280W WO2004025957A1 WO 2004025957 A1 WO2004025957 A1 WO 2004025957A1 JP 0311280 W JP0311280 W JP 0311280W WO 2004025957 A1 WO2004025957 A1 WO 2004025957A1
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- data
- jpeg
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/79—Processing of colour television signals in connection with recording
- H04N9/7921—Processing of colour television signals in connection with recording for more than one processing mode
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/60—Control of cameras or camera modules
- H04N23/69—Control of means for changing angle of the field of view, e.g. optical zoom objectives or electronic zooming
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/79—Processing of colour television signals in connection with recording
- H04N9/80—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback
- H04N9/808—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback involving pulse code modulation of the composite colour video-signal
- H04N9/8081—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback involving pulse code modulation of the composite colour video-signal involving data reduction
- H04N2009/8084—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback involving pulse code modulation of the composite colour video-signal involving data reduction using transform coding
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
- H04N5/765—Interface circuits between an apparatus for recording and another apparatus
- H04N5/77—Interface circuits between an apparatus for recording and another apparatus between a recording apparatus and a television camera
- H04N5/772—Interface circuits between an apparatus for recording and another apparatus between a recording apparatus and a television camera the recording apparatus and the television camera being placed in the same enclosure
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
- H04N5/78—Television signal recording using magnetic recording
- H04N5/781—Television signal recording using magnetic recording on disks or drums
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/79—Processing of colour television signals in connection with recording
- H04N9/80—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback
- H04N9/804—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback involving pulse code modulation of the colour picture signal components
- H04N9/8042—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback involving pulse code modulation of the colour picture signal components involving data reduction
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/79—Processing of colour television signals in connection with recording
- H04N9/80—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback
- H04N9/804—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback involving pulse code modulation of the colour picture signal components
- H04N9/8042—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback involving pulse code modulation of the colour picture signal components involving data reduction
- H04N9/8047—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback involving pulse code modulation of the colour picture signal components involving data reduction using transform coding
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/79—Processing of colour television signals in connection with recording
- H04N9/80—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback
- H04N9/804—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback involving pulse code modulation of the colour picture signal components
- H04N9/806—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback involving pulse code modulation of the colour picture signal components with processing of the sound signal
- H04N9/8063—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback involving pulse code modulation of the colour picture signal components with processing of the sound signal using time division multiplex of the PCM audio and PCM video signals
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/79—Processing of colour television signals in connection with recording
- H04N9/80—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback
- H04N9/82—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback the individual colour picture signal components being recorded simultaneously only
- H04N9/8205—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback the individual colour picture signal components being recorded simultaneously only involving the multiplexing of an additional signal and the colour video signal
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/79—Processing of colour television signals in connection with recording
- H04N9/80—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback
- H04N9/82—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback the individual colour picture signal components being recorded simultaneously only
- H04N9/8205—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback the individual colour picture signal components being recorded simultaneously only involving the multiplexing of an additional signal and the colour video signal
- H04N9/8227—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback the individual colour picture signal components being recorded simultaneously only involving the multiplexing of an additional signal and the colour video signal the additional signal being at least another television signal
Definitions
- the present invention relates to a moving image recording apparatus, and more particularly to a moving image recording apparatus which is applied to, for example, a video camera and records a moving image signal in a compressed state on a recording medium.
- a moving image recording apparatus which is applied to, for example, a video camera and records a moving image signal in a compressed state on a recording medium.
- a main object of the present invention is to provide a moving image recording device capable of controlling the continuous recordable time of a moving image.
- a moving image recording apparatus is a moving image recording apparatus that includes a processor equipped with a multitasking OS and records a moving image signal on a recording medium in a compressed state, and a plurality of tasks executed by the processor include:
- the first task includes a first task involved in the compression processing of the moving image signal and a second task involved in the recording processing of the compressed moving image signal.
- the first task periodically determines the recording processing speed of the compressed moving image signal.
- a change process of changing the compression ratio of the moving image signal based on the determination result of the determination process.
- the moving image signal is recorded in a compressed state on a recording medium under the control of a processor equipped with a multitasking OS.
- the tasks performed by the processor are: Includes a first task involved in video signal compression processing and a second task involved in compressed video signal recording processing. Further, the first task includes a determination process of periodically determining the recording processing speed of the compressed moving image signal, and a change process of changing the compression ratio of the moving image signal based on the determination result of the determination process.
- each of multiple tasks is executed only in time division. Then, the recording processing speed of the compressed moving image signal fluctuates due to the load fluctuation of each task. Therefore, the recording processing speed is periodically determined, and the compression ratio of the moving image signal is changed according to the result of the determination. This makes it possible to control the continuous recordable time of a moving image.
- the second task includes a transfer process of transferring the compressed moving image signal to the recording medium by a predetermined amount.
- the second task is interrupted after the specified amount of transfer is completed.
- the plurality of tasks further include a third task involved in adjusting the capturing condition.
- this adjustment process causes a change in the recording processing speed.
- the capturing means includes photographing means for photographing the subject, and the capturing condition includes photographing conditions of the photographing means.
- the shooting conditions need to be adjusted depends on external factors such as the brightness and color of the object.
- the third task starts at an arbitrary timing, and the recording processing speed fluctuates accordingly.
- the determination processing preferably determines the recording processing speed based on the size of the unrecorded compressed moving image signal stored in the memory.
- a moving picture recording apparatus comprises: a fetching means for fetching a moving picture signal; a compressing means for compressing a moving picture signal every predetermined number of screens to generate a compressed moving picture signal; Recording means for recording on a recording medium; discrimination means for periodically discriminating the processing speed of the recording means; and changing means for changing the compression ratio of the compression means based on the discrimination result by the discrimination means.
- the moving image signal captured by the capturing means is compressed by the compression means for each predetermined number of screens.
- the compressed moving image signal is recorded on a recording medium by a recording unit.
- the processing speed of the recording means is periodically determined by the determination means, and the change means changes the compression ratio of the compression means based on the determination result of the determination means. This makes it possible to control the continuous recordable time of a moving image.
- a bus connected to the memory is used for transferring the moving image signal and the compressed moving image signal.
- the zoom unit performs an electronic zoom process on the moving image signal in a mode selected by the selection unit.
- the zoom means extracts a part of the moving image signal using the memory, and performs the enlargement zoom on the extracted moving image signal. Therefore, when the enlargement zoom is selected, the bus is used to transfer the moving image signal, and the occupancy of the bus for transferring the compressed moving image signal, that is, the processing speed of the recording unit is reduced.
- the determination processing preferably determines the recording processing speed based on the size of the unrecorded compressed moving image signal stored in the memory.
- FIG. 1 is a block diagram showing one embodiment of the present invention
- FIG. 2 is an illustrative view showing one example of a mapping state of SDRAM
- FIG. 3 is an illustrative view showing another example of the mating state of the SDRAM;
- FIG. 4 is an illustrative view showing an example of the configuration of the instruction list;
- FIG. 5 is an illustrative view showing one example of a configuration of an access information table
- FIG. 6 is an illustrative view showing one example of a configuration of a recording medium
- FIG. 7 is an illustrative view showing one example of a configuration of a free space table
- FIG. 8 is an illustrative view showing a structure of a completed movie file
- FIG. 9 (A) is an illustrative view showing a part of the index information creating process
- FIG. 9 (B) is an illustrative view showing another part of the index information creating process
- FIG. 9 (C) is Illustrated illustrations showing another part of the index information creation process
- FIG. 10 (A) is an illustrative view showing a part of an access information table creating process
- FIG. 10 (B) is an illustrative view showing another part of an access information table creating process
- FIG. 10 (C) is an illustrative view showing another portion of the access information table creation processing
- FIG. 11A is an illustrative view showing one portion of a process of creating index information.
- FIG. 11 (B) is an illustrative view showing another part of the index information creating process;
- FIG. 11 (C) is an illustrative view showing another part of the index information creating process;
- FIG. 12 (A) is an illustrative view showing a part of an access information table creating process
- FIG. 12 (B) is an illustrative view showing another part of an access information table creating process
- Figure 12 (C) is an illustrative view showing another part of the process of creating the access information table
- Figure 13 is a flowchart showing a part of the operation of CPU when performing the imaging processing task
- FIG. 14 is a flowchart showing another part of the operation of the CPU when performing the imaging processing task
- Figure 15 is a flow diagram showing another part of the operation of CPU when performing the imaging processing task
- Figure 16 is a flowchart showing yet another part of the operation of the CPU when performing the imaging processing task
- Figure 17 is a flowchart showing another part of the operation of the CPU when performing the imaging processing task
- Figure 18 is a flow chart showing another part of the operation of CPU when performing the imaging processing task
- Fig. 19 is a flowchart showing yet another part of the operation of the CPU when performing the imaging processing task
- Figure 20 is a flowchart showing a part of the operation of the CPU when performing the BG processing task. Yes;
- FIG. 21 is a flowchart showing another part of the operation of the CPU when performing the BG processing task.
- a digital video camera 10 of this embodiment includes an image sensor 12.
- An aperture unit and an optical lens are arranged in front of the image sensor 12, and an optical image of a subject is irradiated on the image sensor 12 via these members.
- the CPU 52 is a multitasking CPU equipped with a multitasking OS such as ITRON.
- a shooting processing task a shooting condition control task
- a BG (Back Ground) processing task are executed in parallel. Be executed. Specifically, each task is executed in a time-sharing manner in response to a vertical synchronization signal, which will be described later, according to a preset priority.
- the operator can select a desired shooting mode from a plurality of shooting modes by operating the menu key 60. Either the resolution and frame rate of the captured image, or the audio system, bit rate, or sampling rate of the captured audio differs in each shooting mode.
- a desired photographing mode is selected, a corresponding information signal is supplied from the system controller 56 to the CPU 52.
- the CPU 52 stores the shooting mode information (resolution, frame rate, sound system, bit rate, sampling rate) indicating the selected shooting mode and the file name of the movie file to be created in the register r gst.
- the CPU 52 also instructs the timing generator (TG) 14 to perform shooting at the resolution and frame rate indicated by the shooting mode information.
- the TG 14 generates a timing signal according to a desired photographing mode (resolution, frame rate) based on a vertical synchronizing signal and a horizontal synchronizing signal output from the signal generator (SG) 16, and rasterizes the image sensor 12. Drive by scan method.
- Image sensor 12 From this, a raw image signal (charge) having a desired resolution is output at a desired frame rate, and the output raw image signal passes through a CDSZAGC circuit 18 and an AZD converter 20 to output raw image data as a digital signal. Is input to the signal processing circuit 22.
- the signal processing circuit 22 When the set zoom magnification is “1.0”, the signal processing circuit 22 performs a series of signal processing such as white balance adjustment, color separation, and YUV conversion on the raw image data input from the A / D converter 20. To generate 1.0 times YUV data.
- the set zoom magnification is less than "1.0”
- the raw image data input from the AZD converter 20 is first subjected to the reduced zoom by the zoom circuit 22a, and after the reduced zoom, the above-described series of signals is output. Processing is executed.
- the YUV data generated by such processing is stored in the SDRAM 26 via the bus B1 and the memory control circuit 26.
- the zoom circuit 22 a first converts the raw image data input from the AZD conversion device 20 to the bus B. Write once to SDRAM26 through 1 and memory control circuit 24. Subsequently, the zoom circuit 22a reads out the raw image data of a part of the area necessary for the enlargement zoom processing through the bus B1 and the memory control circuit 24, and enlarges the raw image data of the read part of the area. Apply zoom. The enlarged raw image data is converted to YUV data by the above-described series of signal processing. As a result, YUV data having a magnification larger than "1.0" is generated. The generated YUV data is stored in the SDRAM 26 via the bus B1 and the memory control circuit 26.
- the video encoder 28 reads the YUV data from the SDRAM 26 through the bus B1 and the memory control circuit 24, and encodes the read YUV data into a composite image signal.
- the encoded composite image signal is displayed on the monitor 3
- the real-time moving image (through image) of the subject is monitored.
- the CPU 52 controls shooting conditions such as an aperture amount, an exposure time, a white balance adjustment gain, and an electronic zoom magnification. Specifically, adjust the aperture or exposure time according to the brightness of the subject, and adjust the white balance according to the color of the subject. The gain is corrected, and the electronic zoom magnification is adjusted according to a change in a state signal indicating the operation state of the zoom key 64. As a result, changes in the brightness and hue of the through image are prevented, and the zoom magnification of the through image changes in response to the operation of the zoom key 64.
- the recording medium 50 is a detachable recording medium that can be accessed by the IZF 46 when the recording medium 50 is inserted into the slot 48.
- the recording medium 50 is provided with a CPU 50a, a buffer memory 50b, and a hard disk 50c.
- the hard disk 50c has a FAT area 501c, a root directory area 502c, and a data area 503c as shown in FIG. You.
- the data writing to the data overnight area 503c is performed by a predetermined amount via the buffer memory 50b.
- the CPU 52 When recording a moving image, the CPU 52 starts a BG processing task. At this time, an instruction list 52a as shown in FIG. 4 is created so that processing can be smoothly performed between the imaging processing task and the BG processing task.
- the CPU 52 In order to create a header, processing to capture thumbnail images and create header information is performed in the next one frame period.
- the signal processing circuit 22 is instructed to perform a thinning process, and the JPEG codec 32 is instructed to perform a compression process.
- the signal processing circuit 22 performs a thinning process in addition to the above-described YUV conversion, and writes the generated thumbnail YUV data to the SDRAM 26 through the bus B1 and the memory control circuit 24.
- the JPEG codec 32 reads the thumbnail YUV data from the SDRAM 26 through the bus B1 and the memory control circuit 24, and performs JPEG compression on the read thumbnail YUV data.
- the JPEG codec 32 then writes the JPEG raw data Rth of the thumbnail image generated by the JPEG compression to the SDRAM 26 through the bus B1 and the memory control circuit 24.
- the CPU 46 also creates a JPEG header Hth of the thumbnail image by itself and writes the created JPEG header Hth to the SD RAM 26 through the bus B1 and the memory control circuit 24.
- the CPU 46 further creates the header information H inf including the above-described shooting mode information by itself, and writes the created header information H Inf to the SDRAM 26 through the bus B 1 and the memory control circuit 24.
- the JPEG raw data Rth, the JPEG header Hth and the header information Hinf are mapped to the SDRAM 26 as shown in FIG.
- the CPU 52 When the creation of the movie file header is completed, the CPU 52 performs an image capturing process and an audio capturing process each time a vertical synchronization signal is generated.
- the JPEG header created by itself is written to the SDRAM 26 through the bus B1 and the memory control circuit 24, and a compression instruction is given to the JPEG codec 32.
- JPEG codec 32 when given a compression instruction
- the YUV data of the current frame is read from the S-DRAM 26 through the bus B1 and the memory control circuit 24, and the read YUV data is compressed to a target size.
- the JPEG codec 32 writes the JPEG raw data to the SDRAM 26 through the bus B1 and the memory control circuit 24.
- the target size at the time of JPEG compression is changed according to the recording status on the recording medium 50.
- the processing may break down due to a bottleneck, so the recording status of the recording medium 50 is periodically detected, and the target size at the time of JPEG compression is changed according to the detection result. Is done.
- This target size change processing will be described in detail later.
- a processing instruction is given to the signal processing circuit 38.
- the signal processing circuit 38 writes the audio data corresponding to one frame stored in the SRAM 38a to the SDRAM 26 through the path B1 and the memory control circuit 38a.
- the JPEG header, JPEG raw data and audio data of each frame are mapped to the SDRAM 26 as shown in FIG.
- the JPEG header and JPEG raw data are assigned serial numbers 0, 1, 2,... Every frame, while the audio data are assigned serial numbers 0, 1, 2 every 3 frames. ,... Are attached.
- one frame of JPEG data is formed by the JPEG header and the JPEG raw data having the same number, and the beginning and end of the JPEG data of each frame are, as shown in FIG.
- the powers SO I (Start Of Image) and E ⁇ I (End Of Image) are assigned.
- the CPU 52 also creates the access information of the JPEG raw data, the access information of the JPEG header, and the index information of the JPEG data every time one frame period elapses, and every three frame periods elapses. Create audio data access information and audio data index information.
- the access information of the JPEG raw data consists of the data size of each frame and the start address in the SDRAM 26, and the access information of the JPEG header also contains the data size of each frame and the start address in the SDRAM 26.
- Consists of The index information of the JPEG data is composed of the data size of each frame and the distance from the head of the movie file when written to the recording medium 50.
- the access information of the audio data is composed of a data size equivalent to 3 frames and a start address in the SDRAM 26, and the index information of the audio data is equivalent to a data size equivalent to 3 frames and written to the recording medium 50. It consists of a g separation from the beginning of the movie file.
- the access information is created in the access information table 52b shown in FIG. 5, and the index information is created in the SDRAM 26 in the manner shown in FIG.
- the SDRAM address and data size of the JPEG raw data for three frames the SDRAM address and data size of the JPEG header for three frames, and the SDRAM for audio data equivalent to three frames Address and data size are associated with each other.
- the position information and size information of the audio data corresponding to three frames and the position information and size information of the JPEG data for three frames are alternately mapped to the SDRAM 26.
- sampling frequency of the audio signal may deviate between the actual processing by hardware and the calculation by software.
- thinning-out interpolation is performed on the index information and access information of the JPEG data in order to compensate for this deviation. This decimation / interpolation processing will be described later in detail.
- the CPU 52 sets “write file” in the instruction list 52a based on the access information described above so as to write audio data equivalent to three frames and JPEG data of three frames to the recording medium 50.
- This “file writing” by the BG process three frames of audio data and three frames of JPEG data are read out from the SDRAM 26 and recorded via the bus B 1 and the IZF circuit 46.
- Given in medium 50 In a data area 503c of the recording medium 50, an audio chunk composed of audio data equivalent to three frames and an image chunk composed of three frames of JPEG data are recorded. As shown in FIG. 8, audio chunks and image chunks are alternately mapped on the movie file.
- the CPU 52 The voice capture is stopped, and "file write” is set in the instruction list 52a so that the index information created in the SD RAM 26 is recorded on the recording medium 50 as shown in FIG.
- the index information is read out from the SDRAM 26 and given to the recording medium 50 via the bus B 1 and the IZF circuit 46.
- the index chunk shown in Fig. 8 is formed at the end of the movie file.
- the position and size of the audio data on the file are managed every time corresponding to three frames, and the position and size of the JPEG data on the file are managed for each frame.
- the CPU 52 calculates the total size value of the movie file created this time, and sets “write file” in the instruction list 52a to write the calculated total size value to the movie file header. I do.
- the file size is added to the header information Hi ⁇ ⁇ ⁇ of the Mopie file header by executing this file writing by the BG processing task, thereby creating a movie file satisfying the QuickTime standard ⁇ Complete.
- the CPU 52 sets "file close” and "BG processing end” in the instruction list 52a.
- "file close” is executed by the BG process
- the size information written in the root directory area 502c and the FAT information written in the FAT area 501c are updated.
- the file name of the movie file created this time is detected from the directory entry, and the size information assigned to the detected file name is updated from "0" to the total size value.
- the FAT information is updated so that a link is formed in the write area (cluster) of the movie file created this time.
- the BG processing is ended by "BG processing end".
- the playback mode is selected by the mode switching switch 62 and the desired copy file is selected by the menu key 60
- a corresponding status signal is given to the system controller 56.
- the CPU 52 detects the selected movie file from the recording medium 50, and reproduces the audio data and JPEG data in the detected movie file. At this time, the playback order is based on the index information in the movie file. follow the information.
- the audio data and JPEG data will be recorded as audio data 0, JPEG data 0 to 2, audio data 1, and jp EG data.
- the read audio data and JPEG data are first stored in the SDRAM 26 by the memory control circuit 24.
- the CPU 52 gives a decompression command to the JPEG codec 32 in the order according to the index information of the JPEG data, and gives a processing command to the signal processing circuit 40 in the order according to the index information of the audio data.
- the JPEG codec 32 reads the JPEG raw data forming the JPEG data of the desired frame from the SDRAM 26 through the bus B1 and the memory control circuit 24, and decompresses the JPEG raw data into the read JPEG raw data. Is applied.
- the YUV data generated by the JPEG decompression is stored in the SDRAM 26 through the bus B1 and the memory control circuit 24, and is then supplied to the video encoder 28 through the bus B1 and the memory control circuit 24. As a result, the corresponding reproduced image is displayed on the monitor 30.
- the signal processing circuit 40 reads audio data corresponding to the desired three frames from the SDRAM 26 through the bus B1 and the memory control circuit 24, and stores the read audio data in the SRAM 40a.
- the audio data stored in the SRAM 40a is then converted into an analog audio signal by the D / A converter 42, and the converted audio signal is output from the speaker 44.
- the reproduced moving image is displayed on the monitor 30, and an audio signal synchronized with the reproduced moving image is output from the speaker 44.
- the CPU 52 executes the photographing processing task shown in FIGS. 13 to 19 and the BG processing task shown in FIGS. 20 to 21 in accordance with the control program stored in the ROM 54.
- step S1 a shooting mode determination process is performed. Specifically, a menu indicating a plurality of shooting modes is displayed on the monitor 30, and a desired shooting mode is determined in response to the operation of the menu key 52. When the shooting mode is determined, the process proceeds to step S3, and shooting mode information indicating the determined shooting mode is created. Setting The constant information is, for example, "resolution: VGA”, “frame rate: 30 fps”, “sound system: monaural”, “bit rate: 8 bits”, and "sampling rate: 8040 Hz”.
- step S5 the file name of the movie file created by the current shooting processing is determined. The file name is, for example, "VCLP 0003. MOV”. The created shooting mode information and file name are registered in the register rgst.
- step S7 various variables are initialized. Specifically, each of the variables f rmc nt, flsz, BG-RemData, re-i f 1 sz, t-i sz and au d-sz is set to "0", and the variable trgt-sz is set to the maximum value MAX. And then set the variable aud s z_fps to the theoretical value LG.
- the variables i and frmcnt are both variables indicating the frame number.
- the variable i continues to be incremented in response to the vertical sync signal, and the variable f rmcnt is cyclically updated between "0" and "3" in response to the vertical sync signal.
- the numerical values "0" to "3” taken by the variable ⁇ rmc n t those that actually have no meaning are "0" to "2".
- one image chunk is formed by three frames of JPEG data.
- the variable f rmcn t is used to specify the order of the J PEG data of interest in the image chunk.
- the variable f 1 s z is a variable indicating the total size value of the JPEG raw data generated by JPEG compression.
- the variable BG—RemD ata is a variable that indicates the size of the JPEG raw data that has been set in the instruction list 52a shown in FIG. 4 but has not yet been recorded on the recording medium 50. It is.
- the variable p re — ⁇ 1 s z is a variable indicating the total size value of the JPEG raw data already recorded on the recording medium 50.
- variable trg t — s z is a variable indicating the target size value when compressing the YUV data of each frame
- variable t — s z is a variable used for calculating the target size value
- the variable aud-sz is a variable that indicates the total size value (bytes) of the captured audio data
- the variable aud sz-fps is a variable that indicates the size of the audio data equivalent to one frame.
- step S9 a processing instruction is given to each of the TG 14, the signal processing circuit 22, and the video encoder 28 in order to display a through image.
- a through image of the object is displayed.
- FILE—STRT is set as a command for “Start BG processing”, and a command, FILE—CREATE as a parameter 1 and 2 for “Create file”, and a drive number (for the drive that drives the recording medium 44). Number) and file path are set.
- commands and parameters 1 Is set as FILE-SET-ALLOC and drive number
- "File Open” is set as FILE-OPEN, drive number and file path as command, parameters 1 and 2.
- the file path set in the "file creation” includes the size information and the file name determined in step S25, and the size information and the file name are written in the directory entry. However, since the movie file is incomplete, the size information indicates "0".
- step S21 When the vertical synchronization signal is output from the SG 16 after the processing in step S19 is completed, YES is determined in step S21, and the value of the variable i is determined in step S23. If the variable i is equal to or greater than "1", the process proceeds to step S31. If the variable i is "0", the process proceeds to steps S31 through S25 to S29. In step S25, a thumbnail image capturing process is performed. Specifically, the JPEG header Hth created by itself is written into the SDRAM 26, and the signal processing circuit 22 and the JPEG codec 32 are each instructed to perform a thinning process and a compression process.
- the signal processing circuit 22 performs the thinning process of the YUV data over one frame period, and writes the thumbnail YUV data thus generated to the SDRAM 26 through the bus B1 and the memory control circuit 24.
- the JPEG codec 32 reads out the thumbnail YUV data from the SD RAM 26 through the bus B1 and the memory control circuit 24, performs JPEG compression processing on the read thumbnail YUV data, and outputs the JPEG raw data Rth. Then, the JPEG raw data R th is written to the SDRAM 26 through the bus B1 and the memory control circuit 24.
- the JPEG header Hth and the JPEG raw data Rth are mapped to the SDRAM M26 as shown in FIG.
- header information H inf including the above-mentioned shooting mode information (resolution, frame rate, sound system, bit rate, sampling rate) is created, and the header information H inf is transmitted to the path B1 and the memory control circuit.
- the header information H inf is mapped onto the J PEG header H th as shown in FIG.
- “file writing” is performed in step S 29 by listing numbers “4” and “5” in the instruction list 52 a shown in FIG. Field.
- Table 1 in “File Write”, FILE-WRITE, handle number (obtained by file open processing), SDRAM address, data size and data size are used as parameters, parameters 1, 2, 3 and 4.
- the type is set. The two “file write” settings are made because the header information H i ⁇ ⁇ and J? £ & header 11 s are continuous on the SDRAM 26, but the J PEG raw data R th Is stored at a remote location.
- the start address of the header information Hi is set as the SDRAM address
- the total size of the header information Hinf and the JPEG header Hth is set as the data size
- the data type is set as the data type.
- “Multi-file header” is set.
- the start address of the JPEG raw data Rth is set as the SDRAM address
- the size of the JPEG raw data Rth is set as the data size
- the data type is set. Is set as "movie file header”.
- the header information Hinf, the JPEG header Hth, and the JPEG raw data Rth are consecutive in this order.
- JPEG data TH is formed by the JPEG header Hth and the JPEG raw data Rth.
- a compression processing instruction is given to the JPEG codec 32.
- the compression processing instruction includes a target size value according to the variable trgt-sz.
- the JPEG codec 32 reads one frame of YUV data from the SDRAM 26 through the path B 1 and the memory control circuit 24, compresses the read YUV data, and executes JPEG raw data of a size close to the target size. An overnight is created, and the generated JPEG raw data is written to the SDRAM 26 through the path B 1 and the memory control circuit 24. JPEG raw data is mapped to SDRAM 26 as shown in Fig. 2.
- J PEG data of the frame is formed by the J PEG header and J PEG raw data obtained in the same frame, and markers SO I and E ⁇ ⁇ ⁇ I are provided at the beginning and end of the J PEG data.
- a processing instruction is given to the signal processing circuit 38 in order to perform a process of capturing audio data corresponding to one frame.
- the signal processing circuit 38 writes the audio data of one frame given from the AZD converter 36 and held in the SRAM 38 a to the SDRAM 26 through the bus B 1 and the memory control circuit 24.
- the audio data is mapped to the SDRAM 26 as shown in FIG.
- the signal processing circuit 38 also returns the size value of the audio data written in the SDRAM 26, that is, the fetched size value, to the CPU 52. Therefore, in step S35, the calculation according to Equation 1 is performed, and the returned captured size value is integrated into the variable a ud—sz.
- step S37 it is determined in step S37 whether or not the JPEG compression has been completed.
- the JPEG codec 32 returns the size value of the generated JPEG raw data, that is, the compressed size value, and a compression completion signal to the CPU 46. Therefore, in step S37, it is determined as YES when the compression completion signal is returned.
- step S39 the operation of Expression 2 is performed to add the returned compressed size value to the variable f1sz.
- step S41 the JPEG header created by itself is written to the SDRAM 26 through the path B1 and the memory control circuit 24, and in the following step S43, the index information of the JPEG data of the current frame is transferred to the bus B1 and the memory control circuit. Write to SDRAM 26 through circuit 24.
- the JPEG header is mapped to the SDRAM 26 as shown in FIG. 2, and the index information is mapped to the SDRAM 26 as shown in FIG.
- step S43 the position information and size information of one frame of JPEG data are created as index information. Also, in the movie file, J for 3 frames One image chunk is formed by PEG decoding. For this reason, in step S43, the number of the current frame in three consecutive frames is specified from the variable f rmcnt, thereby determining the position of the index information to be created in the SDR AM 26. I do.
- step S45 JPEG raw data of the current frame and access information of the JPEG header are created in the access information table 52b shown in FIG. That is, the start address information and the size information of the JPEG raw data of the current frame existing in the SDRAM 26 are created as access information of the JPEG raw data of the current frame, and the start address of the JPEG header of the current frame existing in the SDRAM 26 is generated. Information and size information are created as access information for the JPEG header of the current frame. Then, each created access information is assigned to the variable i set in the access information table 52b.
- step S45 Upon completion of the process in the step S45, the variable i is compared with a frame rate value FPS of the current shooting mode in a step S47. If the frame rate in the current shooting mode is 30 fps, the frame rate value FPS is "30" and the variable i is compared with "30". If i is FPS, the process directly proceeds to step S83, but if i ⁇ FPS, the process proceeds to steps S81 through S49-81. In step S49, it is determined whether the variable f 1 is less than “111” 11 1; power “2”, and if YES, it is determined in step S51 whether the condition of Expression 3 is satisfied. If nt is equal to or greater than "2”, it is determined in step S59 whether the condition of Expression 4 is satisfied.
- aud sz-fps * (i + 1))-aud-sz> aud sz-fs aud-sz is the total size value of the audio data actually captured, and aud sz-fps * (i + 1) Is the product of the number of frames from the start of capture and the theoretical value LG.
- the difference between the two values is compared to the theoretical value LG. As long as the difference value is less than or equal to the theoretical value LG, The process proceeds to step S63 as it is, but if the difference value exceeds the theoretical value LG, the process proceeds to step S63 via steps S53 to S57 or via step S61.
- the error between the two is 3Hz. Then, the size of the audio data corresponding to one second is shifted by 3 bytes. Since the theoretical value LG is 268 bytes, the condition of Expression 3 is satisfied about once every 90 seconds, and steps S53 to S57 are processed. If the actual sampling rate is 8034 Hz and the sampling rate calculated by software is 8040 Hz, the error between the two is 6 Hz. At this time, the condition of Expression 4 is satisfied about once every 45 seconds, and the process of step S61 is executed.
- step S53 each of the variables i and f rmcn t is incremented.
- step S55 the same image index information as the previous time, that is, the same index information as the index information created in the previous step S43 is created in the SD RAM 26.
- step S57 the same access information as the previous time, that is, the previous step S43 is created. Create the same access information as in step 45 in the access information table 52b.
- step S63 Upon completion of the process in the step S57, the process proceeds to a step S63.
- step S61 each of the variables i and frmcnt is decremented, and then the process proceeds to step S63.
- the condition shown in Expression 3 is satisfied.
- the index information of the same JPEG data is set in the SDRAM 26 as shown in FIG. 9B, and the JPEG raw data forming the same JPEG data is set.
- Evening and JPEG header access information is set in the access information table 52b as shown in FIG. 10 (B).
- the index information of the JPEG data P is set in the SDRAM 26.
- the variable frcmnt is incremented, and the index information created in the immediately preceding step S43 is re-enabled, so that the index information of the JPEG data P is interpolated as shown in FIG. 9 (B). Is done.
- the index information of the JPEG data P + 1 is set as shown in FIG. 9 (C).
- the variable i is incremented and the access information created in the previous step S45 is re-validated
- the access to the JPEG raw data P and the JPEG header P is performed as shown in Fig. 10 (B).
- step S61 a part of the index information is overwritten by the subsequent index information as shown in FIG. 11 (B), and the access information is deleted as shown in FIG. 12 (B). Part is overwritten by subsequent access information.
- the index information of the JPEG data P and the index information of the JPEG data P + 1 are set in the SDRAM 26.
- the variable frcmnt is decremented, the index information of the JPEG data P + 1 is changed to the JPEG data P + 2 as shown in FIG. Is overwritten by the index information.
- the index information of the JPEG data P + 1 is thinned out.
- the index information of the JPEG data P + 3 is set as shown in FIG. 11 (C).
- the access information of the JPEG raw data P and the JPEG header P and the access information of the JPEG raw data P + 1 and the JPEG header P + 1 are set in the access information table 52b. ing.
- the variable i is decremented, the access information of the J PEG raw data P + 1 and the J PEG header P + 1 is obtained as shown in FIG. Is overwritten by the access information of J PEG raw data P + 2 and J PEG header P + 2.
- the access information of the JPEG data P + 1 is thinned out.
- the access information of the J PEG raw data P + 3 and the J PEG header P + 3 is set as shown in Fig. 12 (C). Is done.
- variable i is incremented in step S53, and the determination of NO is continued in the next and subsequent steps S51. Since the variable i is decremented in step S61, the determination of NO is succeeded in the next step NO in step S59.
- the process proceeds to step S83 as it is, but if the remainder is "0", the process proceeds to steps S65 to S81 and proceeds to step S83. Since the excessive force S becomes "0" only once in 30 frames, the processing in steps S65 to S81 is executed once in 30 frames.
- step S65 the variable f 1 sz and pre_f 1 sz are subjected to an operation according to equation 5, and in step S67, the difference value ⁇ ⁇ 1 sz obtained by equation 5 and the variable BG—RemData and the frame rate value FPS are calculated. The operation according to Equation 6 is performed.
- t_s z ( ⁇ f 1 s z— BG— R emD a t a) / ⁇ P S
- the variable f 1 sz is the total size value of the JPEG raw data obtained by the JPEG compression
- the variable pre_f 1 sz is the JPEG raw data already recorded on the recording medium 50. Is the total size value.
- the variable pre_f 1 sz is updated only once every 30 frames, and the operation according to Equation 5 is also updated only once every 30 frames. Indicates the total size of the JPEG raw data generated in 30 frames.
- the variable BG—RemData is a J PEG for which the “write file” instruction has been set in the instruction list 52a but has not yet been recorded on the recording medium 50. Raw data! This is the size of one tall size.
- This variable BG—RemData decreases as the time required for "file write” processing decreases, and increases as the time required for "file write” processing increases.
- the subtraction value obtained by subtracting such a variable BG—RemData from the difference value ⁇ f1sz reflects the current processing speed of “file writing”, and this subtraction value is divided by the frame rate value FPS.
- the division value is the compressed size value that allows the variation of the variable BG-RemData under the current processing speed to fall within the specified range. Such a compressed size value is calculated as a variable t-sz.
- the factors that cause the processing speed of "file writing" to vary include the processing speed of the CPU 50a / the characteristics of the recording medium 50 such as the capacity of the buffer memory 50b, as well as the occupancy of the bus B1 and the BG processing task.
- the processing status of the task may be considered.
- the raw image data is temporarily stored in the SDRAM 26 and then input to the signal processing circuit 22. You. At this time, the raw image data is provided to the SDRAM 26 via the bus B1 and returned to the signal processing circuit 22 via the bus B1.
- the occupation rate of the bus B1 increases due to the raw image data transfer processing, thereby decreasing the processing speed of "file writing".
- the shooting condition control task is activated and the aperture, exposure time, white balance adjustment gain, etc. are adjusted. Since each task cannot be executed at the same time, when the imaging condition control task is activated, the BG processing task is interrupted, which slows down the "file write" processing speed.
- variable t-sz is updated periodically in consideration of the fluctuation in the processing speed of the "file writing".
- the target size value and thus the J PEG compression ratio are updated as described later.
- step S69 the calculated variable t__s z is compared with the variable trgt—sz. If t—s z ⁇ trg t_s z, the variable t—sz is compared with the minimum value M IN in step S71. If t—sz ⁇ MIN, the process proceeds directly to step S79, but if t—sz and MIN, the variable t—sz is set to the minimum value MI in step S73. After updating to N, proceed to step S79. On the other hand, if it is determined in step S69 that t ⁇ sz ⁇ trg t_sz, the variable t ⁇ sz is compared with the maximum value MAX in step S75.
- step S79 If t-sz ⁇ MAX, the process directly proceeds to step S79. If t_sz> MAX, the variable t-sz is updated to the maximum value MAX in step S77, and then the process proceeds to step S79. In a step S79, a variable t—sz is set as a variable trg t_s z.
- Equation 6 the variable t—sz decreases when the variable BG—RemDa ta is large, and conversely, the variable t__sz increases when the variable BG—RemData is small. Therefore, “t ⁇ sz ⁇ trgt ⁇ sz” means that the amount of unrecorded JPEG data is large, that is, the processing speed of “file write” is slow. Further, “t_s z ⁇ tr r t — s z” means that the amount of unrecorded J PEG data is small, that is, the recording characteristics of the recording medium 50 are excellent.
- variable t—sz when the variable t—sz is less than the variable trgt—sz, the variable t—sz is set as the variable trg t_sz to enable a smaller target size value (higher JPEG compression ratio) in the next second.
- target size value higher JPEG compression ratio
- variable t—sz is greater than or equal to the variable trgt—sz
- the variable t—sz is changed to the variable trgt—sz to enable a larger target size value (lower JPEG compression ratio) in the next second.
- the size of the JPEG data generated in the next one second is larger than that of the JPEG data generated in the current one second, and the image quality deterioration due to the compression process is reduced.
- step S81 the variable: f 1 s z and BG—RemD a ta are subjected to the operation of Expression 7 to update the variable p re — f 1 s z.
- Equation 7 the total size value of the unrecorded JPEG raw data is subtracted from the previously generated JPEG raw data size. This operation Is also executed every 30 frames, so the variable pre_f 1 sz is updated once every 30 frames. In the next operation, that is, in the operation of Equation 5 after 30 frames, the updated variable P ree — f 1 sz is subtracted from the latest variable f 1 sz. In step S83, the variable ⁇ rmcnt is incremented, and in the following step S85, the value of the incremented variable frmcnt is determined.
- step S87 the index information of the audio data is written into the SDRAM 26.
- the movie file shown in Fig. 7 one audio chunk is formed by audio data corresponding to three frames.
- the position and size of audio data in a file are managed at intervals corresponding to three frames. For this reason, in step S85, position information and size information of the audio data corresponding to the latest three frames are created, and the created index information is written to the SDRAM 26 as shown in FIG.
- the access information of the audio data is written to the access information table 52b. That is, the head address information and the size information of the audio data corresponding to three frames existing in the SDRAM 26 are created as access information, and the created access information is written in the access information table 52b. At this time, the access information is associated with the access information of the JPEG data of the three frames of interest.
- step S91 three frames of JPEG raw data set in the access information table 52b, three frames of JPEG header access information, and three frames of audio data access information are stored. Referring to FIG. 4, "write file" is set in the instruction list 52a shown in FIG. As shown in FIG.
- step S91 audio data corresponding to three frames is continuous on the SDRAM 26, but JPEG raw data and a JPEG header of three frames are discretely distributed on the SDRAM 26. For this reason, in step S91, a total of seven "file writing" are set in the instruction list 52a.
- the SDRAM address is the start key of the audio data equivalent to the three frames of interest.
- the data size indicates the size of the audio data corresponding to the three frames of interest, and the data type indicates the audio chunk.
- the start address and data size are equal to the SDRAM address and data size forming the access information created in step S87.
- the SDRAM address indicates the start address of the JPEG header of the three frames of interest
- the data size is the size of the JPEG header of the three frames of interest. Indicates the size
- the data type indicates the JPEG header.
- the start address and the data size are equal to the SDRAM address and the data size forming the access information of the JPEG header of the latest three frames created in step S45 or S57.
- the SDRAM address indicates the start address of the JPEG raw data of the three frames of interest
- the data size is the size of the JPEG raw data of the three frames of interest. Indicates the size
- the data type indicates JPEG raw data.
- the start address and data size are equal to the SDRAM address and data size forming the latest three frames of JPEG raw data—evening access information created in step S45 or S57.
- step S93 the calculation of equation 8 is performed to add the size value of the three-frame JPEG raw data set in the instruction list 52a in step S91 to the variable BG—RemDat a.
- step S95 the frame number i is incremented.
- step S97 it is determined whether or not the shirt button 58 has been operated. Steps S21 to S95 are repeated as long as the shirt button 58 is not pressed.
- the PEG header, JPEG raw data, and audio data are mapped to the SDRAM 26 as shown in FIG.
- step S99 determines the value of the variable f rmc n t.
- the process proceeds to step S103, but if the variable f rmcnt force is "1" or "2”, "file writing" is instructed in step S101 in the list 52. After setting to a, go to step S103.
- variable rmcnt When the variable rmcnt is "1", the last audio chunk and image chunk are formed by one frame of audio data and JPEG data, and a total of three "file writing" are set in the instruction list 52a.
- Variable f rmcn t When the variable rmcnt is "1", the last audio chunk and image chunk are formed by one frame of audio data and JPEG data, and a total of three "file writing" are set in the instruction list 52a.
- the instruction list 52a contains a total of five
- step S103 "write file” is set in the instruction list 52a in order to write the index information shown in FIG. 3 into the movie file.
- the SDRAM address and data size set here indicate the start address and total size of the index information shown in FIG. 3, and the data type indicates the movie file header.
- step S105 the total size of the movie file is calculated based on the size information included in the index information, and the calculated total size data is written to the SDRAM 26.
- steps S107 to S111 "write file”, "close file” and “end BG processing” are set in the instruction list 52a.
- the SDRAM address and data size set in “Write file” indicate the head address and data size of the total size data, and the data type indicates the movie file header.
- "File close” is FILE— CLOSE Is set as a command
- FILE-END is a command in "End BG processing”.
- the total size value is added to the size information of the movie file header.
- the size information of the directory entry (the size information written based on the process of step S15) is updated from “0” to the total size value,
- the FAT information in the FAT area 501c is updated so that a link is formed in the writing area of the movie file created this time.
- the BG processing ends with "BG processing end”.
- step S121 the read destination list number L is set to "0", and in subsequent step S123, it is determined whether the command read from the list number L is FILE-STRT. If YES here, the list number L is incremented in step S125, and the contents of the command read from the incremented list number L are stored in steps S127, S131, S135, S139, and S147. Each is determined. If the read command is FILE-CREATE, YES is determined in step S127, and file creation processing is performed in step S129.
- the recording medium 50 is specified by the drive number set in parameter 1 and the file name and size 0 are indicated in the directory entry of the recording medium 50 based on the file path set in parameter 2. Write the size information. Upon completion of the process, the process returns to step S125.
- step S131 If the read command is FILE-SET-ALLOC, YES is determined in step S131, and table creation processing is performed in step S133.
- the recording medium 50 is specified by the drive number set in the parameter “1”, and the empty area cassette 52c shown in FIG. 7 is created by referring to the FAT information.
- the process Upon completion of the process, the process returns to the step S125.
- the read command is FILE-OPEN, the flow advances from step S135 to step S137 to perform a file open process. That is, the recording medium 50 is specified by the drive number set in the parameter 1, the file is specified based on the file path set in the parameter 2, and an eight-digit number assigned to this file is created. The created handle number is used for the photographing process.
- the process Upon completion of the process, the process returns to the step S125.
- step S141 If the read command is FILE-WRITE, the process proceeds from step S139 to step S141 to perform a file write process.
- the movie file to be written is specified by the handle number set in parameter 1 and the read start address and read are set according to the SDRAM address and data size set in parameters 2 and 3. Specify the size. Then, based on the read start address and the read size, the data is read from the SDRAM 26 in units of a code, and the read data is provided to the CPU 50a of the recording medium 50 together with the write destination movie file information.
- a BUSY signal is returned from the CPU 50a to the CPU 52 when the buffer memory 50b becomes full. You.
- the process in step S141 is interrupted in response to the BUSY signal.
- a READY signal is returned from the CPU 50a to the CPU 52.
- the process in step S141 is restarted in response to the READY signal.
- step S143 the type of parameter set for parameter 4 is determined. If the data type is not "JPEG raw data”, the process directly returns to step S125, but if the data type is "JPEG raw data", the calculation according to equation 9 is performed in step S145. Then, the process returns to step S125. [Formula 9]
- BG—RemDat a BG_RemDat a—J PEG raw data size value According to Equation 9, the data size set in parameter 3 is subtracted from the variable BG—RemDat a. As a result, the variable BG—RemDat a indicates the size of the JPEG raw data set in the instruction list 52 a but not yet recorded on the recording medium 50.
- step S147 If the read command is FILE-CLOSE, the process proceeds from step S147 to step S149 to perform a file closing process. Specifically, the size information assigned to the file name of the open file is updated by the total size value held in the SDRAM 26, and the FAT area 501c is updated by the FAT information held in the SDRAM 26. Update FAT information for. Upon completion of the process, the process returns to the step S125.
- step S147 If the read command is FILE-END, it is determined in step S147 that the command is N ⁇ , and the process returns to step S121.
- the BG process shifts to a standby state.
- the YUV data of a plurality of frames forming a moving image is recorded in a compressed state on the recording medium 50 under the control of the CPU 52 equipped with a multitasking OS.
- the plurality of tasks executed by the CPU 52 include an imaging processing task involved in compression processing of YUV data of a plurality of frames and a BG processing task involved in recording processing of JPEG data of a plurality of frames.
- the shooting processing task is a discrimination processing that periodically determines the recording processing speed of JPEG data.
- each of the tasks is executed only in a time-sharing manner. Then, the recording processing speed of JPEG data fluctuates depending on the load fluctuation of each task.
- the zoom circuit 22a writes the raw image data once to the SDRA M26 through the bus B1 and the memory control circuit 24 when the enlargement zoom is selected by the zoom key 64, and partially writes the raw image data to the bus B1 and the bus B1.
- the data is read through the memory control circuit 24, and the read raw image data is subjected to an enlarged zoom. For this reason, even when the magnified zoom is selected, it is recorded due to the reduced occupancy of bus B1.
- the recording processing speed decreases. Therefore, in this embodiment, the recording processing speed is periodically determined, and the compression ratio of the YUV data is changed according to the determination result. This makes it possible to control the continuous recordable time of a moving image.
- the image compression is performed by the JPEG method.
- the MPEG method may be adopted instead of the JPEG method, and the target size value may be updated in GOP units.
- the target size value is updated every 30 frames.
- the target size value is changed to 32 frames, 64 frames, and 128 frames.
- the target size may be updated for each number of frames corresponding to a power.
- the number of frames of the JPEG data is adjusted when performing the recording process.
- the number of frames may be adjusted during the reproduction process.
- both the access information and the index information are thinned / interpolated.
- the playback order of JPEG data is controlled based on only the index information, only the index information is used.
- a thinning-out Z-interpolation may be applied to the data. As a result, it is possible to prevent the JPEG data from being lost due to the access information thinning process.
- the FAT method is adopted as the recording method of the moving image signal, but a UDF (Universal Disk Format) method may be adopted instead.
- UDF Universal Disk Format
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Abstract
Description
Claims
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US10/526,900 US7609301B2 (en) | 2002-09-10 | 2003-09-03 | Motion image recording device with compression ratio control |
AU2003261918A AU2003261918A1 (en) | 2002-09-10 | 2003-09-03 | Moving image recording device |
EP03795289A EP1549063A4 (en) | 2002-09-10 | 2003-09-03 | DEVICE FOR RECORDING IMAGES IN MOTION |
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JP2002263769A JP4179831B2 (ja) | 2002-09-10 | 2002-09-10 | 動画像記録装置 |
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PL364275A1 (en) * | 2003-12-30 | 2005-07-11 | Advanced Digital Broadcast Ltd. | Method and system for recording and tracing markers in a data flow |
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JP4720387B2 (ja) * | 2005-09-07 | 2011-07-13 | ソニー株式会社 | 撮像装置、画像処理装置、および方法、並びにコンピュータ・プログラム |
US8098295B2 (en) * | 2006-03-06 | 2012-01-17 | Given Imaging Ltd. | In-vivo imaging system device and method with image stream construction using a raw images |
US9138656B2 (en) * | 2006-06-14 | 2015-09-22 | D-Box Technologies Inc. | Control of a plurality of motion platforms in synchrony with a sequence of images |
CN101335166B (zh) * | 2007-06-27 | 2010-06-30 | 中国科学院电子学研究所 | 一种阴极用三元合金膜及制备覆膜浸渍扩散阴极的方法 |
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- 2003-09-03 AU AU2003261918A patent/AU2003261918A1/en not_active Abandoned
- 2003-09-03 EP EP03795289A patent/EP1549063A4/en not_active Withdrawn
- 2003-09-03 CN CNB038209225A patent/CN100403791C/zh not_active Expired - Fee Related
- 2003-09-03 US US10/526,900 patent/US7609301B2/en not_active Expired - Fee Related
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Also Published As
Publication number | Publication date |
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JP4179831B2 (ja) | 2008-11-12 |
KR100675468B1 (ko) | 2007-01-29 |
US20060153539A1 (en) | 2006-07-13 |
CN1679328A (zh) | 2005-10-05 |
AU2003261918A1 (en) | 2004-04-30 |
JP2004104472A (ja) | 2004-04-02 |
EP1549063A1 (en) | 2005-06-29 |
KR20050040942A (ko) | 2005-05-03 |
EP1549063A4 (en) | 2010-09-01 |
US7609301B2 (en) | 2009-10-27 |
CN100403791C (zh) | 2008-07-16 |
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