JP2004328405A - Moving image recording and reproducing device, its still image compression recording method, and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress costs by reducing the large capacity of a DVC having a still image recording function since data for one screen of the DVC has very large capacity of about 5 Mbit. <P>SOLUTION: This moving image recording and reproducing device is functionally constituted of three blocks which are a camera block 10, a VTR block 20 and a DSC block 30. In the DSC block 30, a video I/F part 31 is a circuit for fetching a moving image signal to be outputted from the camera block 10 into a line buffer 32, the line buffer 32 is an image memory for eight lines to be used for JPEG compression processing, a JPEG Codec 33 is a circuit for performing the JPEG compression processing such as DCT, Huffman and also performs communication with other microcomputers. A memory card 34 is a card medium which records compressed still image data for eight lines. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a moving image recording / reproducing apparatus, a still image compression / recording method and a program thereof, and particularly to a still image compression / recording process of a moving image recording / reproducing apparatus such as DVC without using a large-capacity image data storage memory. The present invention relates to a moving image recording / reproducing device that realizes a compression function, a still image compression recording method, and a program.
[0002]
[Prior art]
2. Description of the Related Art In recent years, along with the development of the miniaturization technology of semiconductor devices, LSIs composed of the semiconductor devices have been increased in scale. For example, CCD (Charge Coupled Devices) as an imaging device having 6.31 million pixels has been put to practical use.
[0003]
The image data picked up by the CCD is sampled into three pieces of analog information of R, G, and B, and the brightness of each pixel is A / D converted, converted into 8-bit data, and recorded / reproduced as digital data. Is processed.
[0004]
In addition to recording / reproducing image information obtained by a CCD as a moving image, for example, a JPEG (Joint Photographic Experts Group) which is a compression method standard for recording / reproducing as a still image such as a digital camera uses data. Although it is possible to compress and record the amount from 1/5 to 1/50, the higher the compression ratio, the more the image quality deteriorates. Therefore, the optimum compression ratio is applied according to the application.
[0005]
Referring to FIG. 7, which shows a general configuration of a conventional DVC having a still image recording function of this type, a camera block 10, a VTR block 20, and a DSC block 40 are functionally composed of three blocks. Is a digital video transmission format, ITU-R BT. 601 and ITU-R BT. 656.
[0006]
The camera block 10 includes a CCD 11, a CAM signal processor 12 for inputting image data from the CCD 11, a camera image memory 13 and a CAM control microcomputer 14 that interface with the CAM signal processor 12, respectively.
[0007]
The DSC block 40 includes a DSC signal processor 41 for inputting an analog signal from the CAM signal processor 12 via the video bus 1_101, a DSC image memory 42, a DSC control microcomputer 43, and a memory card 44 for interfacing with the DSC signal processor 41, respectively. And
[0008]
The VTR block 20 includes a VTR signal processor 21 for inputting a moving image signal from the DSC signal processor 41 via the video bus 2_102, and a WORK memory 22, a VTR control microcomputer 23, an LCD 24, and a TAPE 25 each of which interfaces with the VTR signal processor 21. The CAM control microcomputer 14 is mutually interfaced with the DSC control microcomputer 43 of the camera block 10, the VTR control microcomputer 23 of the DSC block 40, and the serial communication bus line 50.
[0009]
In the camera block 10, the CCD 11 outputs an image input through a lens as an analog moving image signal, and the CAM signal processing circuit 12 performs signal processing such as A / D conversion, YC generation, and gamma correction on the output.
[0010]
The camera section image memory 13 is a video signal recording memory managed by the CAM signal processing circuit 12, and the CAM control microcomputer 14 controls the CAM signal processing circuit 12 and communicates with other microcomputers. The signal processing circuit 21 generates a signal for display on the LCD 24 and performs DV compression processing for recording the tape 25. The work memory 22 is a memory managed by the VTR signal processing circuit 21, a working memory for signal processing, and a small capacity. It has become.
[0011]
The LCD 24 is a liquid crystal panel for displaying images, and the TAPE 25 is a tape medium for recording DV-compressed moving image data. The CAM control microcomputer 23 controls the VTR signal processing circuit 21 and also communicates with other microcomputers.
[0012]
In the DSC block 40, the DSC signal processing circuit 41 performs still image generation such as pixel number conversion and JPEG compression processing. The DSC section image memory 42 is a video signal recording memory managed by the DSC signal processing circuit 41. Controls the DSC signal processing circuit 41 and also communicates with other microcomputers. The memory card 44 is a card medium for recording still image data.
[0013]
When recording a still image with the conventional configuration, first, the DSC signal processing circuit 41 takes in data of one screen from the moving image signal output from the video bus 1-101 of the camera block 10 into the image memory 42 of the DSC section.
[0014]
Further, the DSC signal processing circuit 41 performs JPEG compression processing while continuously outputting a moving image signal to the VTR block 20 via the video bus 2-102. This compression is repeated several times because the data amount after compression needs to approach a target value.
[0015]
The compression processing until the data amount is determined at this time is pre-compression. Then, the generated still image data is recorded on the memory card 44.
[0016]
In the above-described conventional method, it is necessary to store data for one screen in the DSC image memory 42 which can be freely accessed by the DSC signal processing circuit 41.
[0017]
As another conventional example, there is a control method of writing and reading image data to and from a line memory used in a signal processing system that performs image compression processing according to JPEG or the like (for example, see Patent Document 1).
[0018]
Further, as another conventional example, image data can be read from the other of the first and second buffer areas while writing image data to one of the first and second buffer areas of the ring buffer. Even if the storage capacity of the buffer is not large, writing and reading of image data can be performed quickly (for example, see Patent Document 2).
[0019]
[Patent Document 1]
JP-A-2001-285644 (paragraphs "0025" to "0027", "0040", FIG. 6)
[Patent Document 2]
JP-A-2002-254729 (paragraphs “0007”, “0021” to “0023”, FIG. 4).
[0020]
[Problems to be solved by the invention]
As described above, the conventional DVC having a still image recording function has an extremely large capacity of about 5 Mbits of data for one screen, so that there is a problem that the cost cannot be suppressed to cope with the large capacity.
[0021]
By performing JPEG compression processing on a moving image input from the video bus 1-101 in real time, it is not necessary to have an image memory in the DSC block 40. In this case, JPEG compression is performed by hardware, and the circuit scale is increased. This further increases the cost.
[0022]
On the other hand, in the example of Patent Document 1, there is no wait for writing and reading of image data to a line memory having a memory capacity of one bank, and real-time processing can be performed.
[0023]
Certainly, there is no wait for writing and reading of image data, but as in the present invention described below, two memories for data storage are prepared, and while the compression processing is performed on one memory data, the other is used. Is different from the one that stores data in the memory of.
[0024]
That is, among the uncompressed blocks, the line selection and the order of fetching the odd / even lines, which can be fetched at the fastest speed, can be accelerated by selecting the portion that can be fetched at the highest speed. The literature does not take such an approach.
[0025]
In the example of Patent Document 2, image data can be read from the other of the first and second buffer areas while image data is written to one of the first and second buffer areas of the ring buffer. This is not a method of increasing the processing speed by selecting a portion that can be captured at the highest speed as in the invention.
[0026]
SUMMARY OF THE INVENTION An object of the present invention has been made in view of the above-mentioned disadvantages of the related art, and there is no need to use a large-capacity memory for storing image data. The required memory capacity is eight lines (82 Kbits). It is an object of the present invention to provide a moving picture recording / reproducing apparatus and a still picture compression / recording method thereof which contribute to reduction of the number of pictures. Another object of the present invention is to provide a compression method in which there is no weight in writing and reading image data.
[0027]
[Means for Solving the Problems]
The moving image recording / reproducing apparatus of the present invention records moving image information externally input to moving image recording means via a bus line, and captures eight lines of image data as one block from the moving image information on the bus line, and As a means for suppressing the compression time of an entire screen when compressing a still image every time and recording it in the still image recording means, the order of taking in the blocks to be compressed is random, and the first block after compressing the image data of any one block A pre-compression unit is provided which uses image data of an arbitrary line that matches the signal capture instruction timing as head data of a next capture block.
[0028]
Another feature of the moving picture recording / reproducing apparatus of the present invention is that the moving picture information input from the outside is recorded on a moving picture recording means via a video bus line, and arbitrary image data is read from the moving picture information on the video bus line to obtain a still picture. As a means for suppressing the compression time of one entire screen when the data is compressed and recorded in the still image recording means, the image data of eight lines is taken into the line buffer means as one block, and the compression operation of the image data for one block is completed. The present invention has a pre-compression means for detecting the image data of the block from which the next capture can be started at the earliest time from the image data of the remaining blocks, capturing and compressing the image data.
[0029]
The pre-compression control means includes a video interface means for taking in the image data from the video bus, a line buffer means for temporarily storing the image data for eight lines, and a compression means for performing a compression process based on a still image compression standard. Means and a memory card for storing compressed image data for eight lines.
[0030]
Still another feature of the moving picture recording / reproducing apparatus of the present invention is that the moving picture information input from the outside is recorded in a moving picture recording means via a video bus line, and arbitrary image data is read from the moving picture information on the video bus line to capture When the image is compressed and recorded in the still image recording means, the interlaced moving image information for eight lines is converted into the first and second lines in response to the read instruction signals for the odd and even lines as compression means for suppressing the compression time of the entire screen. When sequentially taking in the buffer means, the compression processing is performed on the memory data of one line buffer means while the other line buffer means stores the interlaced moving picture information of the odd and even lines in a function of suppressing the waiting time for taking. The present invention has a pre-compression control means provided.
[0031]
Further, the pre-compression means having the function of suppressing the capture waiting time,
At the point in time when the compression operation of one block of image data has been performed on the memory data of one line buffer means, the odd or even line image data from which the next capture can be started earliest is transferred to the other line buffer means. Has the function of alternately repeating the operation of reading from and compressing the data.
[0032]
Still another feature of the moving picture recording / reproducing apparatus of the present invention is that the moving picture information inputted from the outside is recorded on a moving picture recording means via a video bus line, and arbitrary image data is read from the moving picture information on the video bus line to obtain a still picture. When compressing the image and recording it in the still image recording means, a block number is added to the block to be compressed and its data, and after all the compression processing is completed, the compressed data read out in the order of the block number is stored in a memory card. It has the function of recording to
[0033]
In the still image compression recording method of the present invention, an externally input moving image information is recorded in moving image recording means via a video bus line, and arbitrary image data is taken from the moving image information on the video bus line to compress a still image. At the time of recording in the still image recording means, the pre-compression means is used to capture eight lines of image data as one block into the line buffer means, and the earliest time is obtained when the compression operation of one block of image data is completed. The object of the present invention is to detect the image data of the block from which the next capture can be started from the image data of the remaining blocks, capture and compress the image data.
[0034]
Another feature of the still image compression recording method of the present invention is that an externally input moving image information is recorded in a moving image recording means via a video bus line, and arbitrary image data is read from the moving image information on the video bus line to obtain a still image. When the image is compressed and recorded in the still image recording means, the interlace moving image information for eight lines is converted into first and second line buffers in accordance with read instruction signals for odd and even lines using pre-compression control means. Means for storing the interlaced moving picture information of the odd and even lines in the other line buffer means while the compression processing is being performed on the memory data of the one line buffer means, thereby suppressing the waiting time for taking in the data. Features.
[0035]
Further, at the time when the compression operation of the image data for one block has been performed on the memory data of the one line buffer means, the image data of the odd or even line from which the next capture can be started earliest is replaced by the other. The operation of reading and compressing from the line buffer means is alternately repeated.
[0036]
Still another feature of the still image compression recording method of the present invention is that externally input moving image information is recorded in moving image recording means via a video bus line, and arbitrary image data is fetched from the moving image information on the video bus line. When a still image is compressed and recorded in the still image recording means, a block number is added to the compression target block and its data, and after all the compression processing is completed, the compressed data read out in the order of the block number is stored in a memory. Recording on a card.
[0037]
Still another feature of the still image compression recording method of the present invention is that externally input moving image information is recorded on moving image recording means via a video bus line, and arbitrary image data is fetched from the moving image information on the video bus line. When a still image is compressed and recorded in the still image recording means, a block number is added to the block to be compressed and its data, and the block number is temporarily stored in the memory means. And recording the compressed data read out in the order of the block numbers on a memory card.
[0038]
Still another feature of the still image compression recording method of the present invention is that externally input moving image information is recorded in moving image recording means via a video bus line, and arbitrary image data is read from the moving image information on the video bus line. In order to suppress the compression time of the entire screen when the captured still image is compressed and recorded on the still image recording means, the image data for eight lines is captured as one block in the line buffer means, and the image data for one block is compressed. The pre-compression processing step of detecting and capturing the image data of the block that can start the next capture as soon as possible after the operation is completed from the image data of the remaining blocks and compressing the data, and the block number in the compressed data And temporarily stores the compressed data in the memory means, and after the compression processing is completed, the compressed data read out from the memory means in the order of the block numbers. The and a processing step of the present compression and a process of recording into the memory card.
[0039]
Further, the processing steps performed by the pre-compression means include a video interface means for taking in the image data from the video bus, a line buffer means for temporarily storing the image data for eight lines, and a compression processing based on a still image compression standard. Processing means for inputting a signal for starting capture of a still image from a CPU of the moving image recording / reproducing apparatus, using a compression means for performing the compression and a memory card for storing compressed eight lines of image data;
Reading the image data on the video bus into the video interface means, and detecting the current number of lines;
A processing step of determining whether or not the data of the detected line has been subjected to compression processing;
A processing step of setting the processing target to the number of lines of the next block if the compression processing has been completed;
A processing step of determining whether or not the compression processing has been performed again;
If the compression processing has not been completed, a processing step of fetching data from the unfinished line into the line buffer means and performing compression processing by the compression means;
The block after the compression processing is set as processed, and the processing step of adding the data size after compression to the total size variable is repeated until all blocks to be compressed are completed.
[0040]
Further, in the main compression processing step, a video interface unit that takes in the image data from the video bus, a line buffer unit that temporarily stores the image data of eight lines, and performs a compression process based on a still image compression standard. A processing step of inputting a still image capture start signal from a CPU of the moving image recording / reproducing apparatus, using a compression unit and a memory card storing compressed eight lines of image data;
Reading the image data on the video bus into the video interface means, and detecting the current number of lines;
A processing step of determining whether or not the data of the detected line has been subjected to compression processing;
A processing step of setting the processing target to the number of lines of the next block if the compression processing has been completed;
A processing step of determining whether or not the compression processing has been performed again;
If the compression processing has not been completed, a processing step of fetching data from the unfinished line into the line buffer means and performing compression processing by the compression means;
A processing step of adding the block number as a header to the compressed block and its data,
A processing step of setting the block after compression processing as processed, and repeating the processing step of adding the data size after compression to the total size variable until all blocks to be compressed are completed;
After the compression processing is completed for all the blocks, a processing step is performed in which the data is read out at the time of recording in the memory card in the numerical order.
[0041]
BEST MODE FOR CARRYING OUT THE INVENTION
First, a first embodiment of the present invention will be described in detail with reference to the drawings.
[0042]
Referring to FIG. 1 showing a block diagram of the first embodiment of the present invention, a camera block 10, a VTR block 20, and a DSC block 30 are functionally composed of three blocks. As in the example, the digital video transmission format ITU-R BT. 601 and ITU-R BT. 656.
[0043]
The camera block 10 includes a CCD 11, a CAM signal processor 12 for inputting image data from the CCD 11, and a camera section image memory 13 and a CAM control microcomputer 14 that bidirectionally interface with the CAM signal processor 12.
[0044]
The DSC block 30 includes a video I / F 31 for inputting a digital signal from the CAM signal processing 12 via the video bus 100, a line buffer 32 for interfacing with the video I / F 31, a JPEG Codec 33 for interfacing with the line buffer, and a JPEG Codec 33. And a memory card 34 that interfaces with the memory card.
[0045]
The VTR block 20 includes a VTR signal processor 21 for inputting a moving image signal from the CAM signal processor 12 of the camera block 10 via the video bus 100, a work memory 22 and a VTR control microcomputer 23 for bidirectionally interfacing with the VTR signal processor 21. And a LCD 24 and a TAPE 25 for inputting signals from the VTR signal processing 21. The VTR control microcomputer 23 is bidirectionally connected to the CAM control microcomputer 14 of the camera block 10, the JPEG Codec 33 of the DSC block 30, and the serial communication bus line 50. Interfaced with
[0046]
In the camera block 10, the CCD 11 outputs an image input through a lens as an analog moving image signal, and the CAM signal processing circuit 12 performs signal processing such as A / D conversion, YC generation, and gamma correction on the output.
[0047]
The camera section image memory 13 is a video signal recording memory managed by the CAM signal processing circuit 12, and the CAM control microcomputer 14 controls the CAM signal processing circuit 12 and also communicates with other microcomputers.
[0048]
In the VTR block 20, the VTR signal processing circuit 21 performs a process of generating a display signal for the LCD 24 and a process of DV compression for recording on the TAPE 25, and a work memory 22 is a memory managed by the VTR signal processing circuit 21 and performs signal processing. Work memory and small capacity.
[0049]
The LCD 24 is a liquid crystal panel for displaying images, and the TAPE 25 is a tape medium for recording DV-compressed moving image data. The CAM control microcomputer 23 controls the VTR signal processing circuit 21 and also communicates with other microcomputers.
[0050]
In the DSC block 30, the video I / F unit 31 is a circuit that takes in a moving image signal output from the camera block 10 into a line buffer 32. The line buffer 32 is an image memory for 8 lines used for JPEG compression processing. The JPEG Codec 33 is a circuit that performs JPEG compression processing such as DCT and Huffman, and also performs communication with other microcomputers. The memory card 34 is a card medium for recording still image data.
[0051]
Referring to FIG. 1 and FIG. 2 showing a timing chart for explaining the operation of the first embodiment, the frame synchronization signal and the image data in FIG. 2 are elements of the video bus 100 in FIG. Symbols a to g in the data are used as block names when eight lines, which are processing units of JPEG compression processing, are considered as one block.
[0052]
The signal capture indicates data stored in the line buffer 32 via the video I / F unit 31. The compression process indicates the time required for the JPEG compression process in the JPEG Codec unit 33. Symbols a to g in the signal fetching and compression processing are the same as the block names of the image data described above.
[0053]
After the signal is captured, compression processing is performed, and when the processing is completed, data that can be captured at the earliest time is detected, and the data is sequentially captured and compressed to reduce the waiting time of the processing.
[0054]
In general, still image recording devices require precision in the data size after compression in order to display the remaining recordable number. However, as a property of JPEG compression, the data size after compression greatly varies depending on frequency components of input data, and it is difficult to specify this size in advance.
[0055]
Therefore, it is necessary to repeat compression several times to determine the compression ratio, and the compression process for determining the compression ratio is pre-compression. As described above, in the JEPG file, the compressed data is stored in the order of the screen operation. However, at the time of pre-compression, the data after compression is not necessary, and the data size after compression is necessary.
[0056]
Focusing on this, at the stage when the compression processing of a certain processing unit is completed at the time of pre-compression, the line transferred to the video bus is determined, and the processing is started from the line that can be captured at the fastest speed, so that the entire screen is Can be shortened.
[0057]
That is, to perform the fastest capture here means to buffer the image data for eight lines in order to perform the JPEG compression process. This is a buffering action. It means that the JPEG compression processing is the fastest. Although the contents are strictly different, the fetching process is a process necessary only for performing the JPEG compression process.
[0058]
Next, referring to FIG. 3 which shows a flowchart of the pre-compression processing, first, a signal for starting capture of a still image is input from the system microcomputer (processing step A-1). The data sent from the CAM signal processing circuit 12 to the video bus 100 is read into the video I / F 31, and the current number of lines is detected (processing step A-2). By detecting the current number of lines, the number of leading lines that can be JPEG compressed at the highest speed is determined (processing step A-3).
[0059]
That is, the input image data is sequentially input line by line from the first line to the last line. Since JPEG compression processing must be performed in units of 8 lines, if the next input line is 2 to 8 lines, the compression processing is executed from the ninth line. Is determined to be executed from the 17th line, and the number of top lines that can be processed at the highest speed is determined.
[0060]
It is determined whether or not the data of the line has been subjected to compression processing (processing step A-4). If the compression processing has been completed, the processing target is set to the number of lines of the next block (processing step A-5), and it is determined again whether the compression processing has been performed (processing step A-4).
[0061]
If the compression processing has not been completed, the data from the line is fetched into the line buffer 32 via the video I / F 31, and compression processing is performed by the JPEG codec unit 33 (processing step A-6).
[0062]
The block for which compression processing has been completed is set as processed, and the data size after compression is added to the total size variable (processing step A-7).
[0063]
That is, in the JPEG compression processing, the data size after compression is variable due to a trade-off with image quality. In products such as digital cameras, the absolute value of the data size tends to be more important than the image quality (in order to display the remaining recordable number). The compression process is performed seven times before the compression, and the total size of the compressed data obtained in each of the seven compression processes is determined by the final required file size of the JPEG file It becomes.
[0064]
The JPEG compression process cannot derive this size without actually completing the compression. Therefore, it is necessary to perform compression several times while changing parameters at the time of compression to derive a compression parameter suitable for a target file size. At this time (until parameter determination), the compression process is called pre-compression. Has defined.
[0065]
In the pre-compression step, the compressed image data itself is not required as described above, and only the data size is required. Therefore, a variable called a total size variable is defined and stored.
[0066]
Next, it is determined whether the compression processing of all the blocks has been completed (processing step A-8). If the compression processing of all the blocks has not been completed, the process returns to processing step A-2, and the compression processing has been completed. In this case, it is completed.
[0067]
Further description will be made with reference to FIG. 2 described above. First, after the capturing process and the compression process of the a block are performed, the block which can be captured at the next highest speed is the b block. Since the data flowing on the video bus is in the middle of the block d when the b block is fetched and the compression process is performed, the next fetch is performed on the block e.
[0068]
After the compression processing of the e block is completed, the block which can be captured next at the highest speed is the a block, but since the a block has already been compressed by the determination in the processing step A-4 in FIG. The target is b blocks. However, since the b block has already been compressed, the capture target is the c block. Since the c block is not compressed, it is captured.
[0069]
In general, JPEG compression processing is performed sequentially from the top of the screen in the order of a block, b block, c block, d block, e block, f block, and g block. In the present invention, such sequential execution is not performed. 2 shows that processing is performed efficiently in random order from the block that can be fetched next.
[0070]
It should be noted that the mutual relationship between the current number of lines and the number of top lines that can be processed at the highest speed is added. Image data from the first line to the last line is always flowing on the video bus. The current number of lines refers to the number of lines of data flowing on the video bus at the stage of performing the capture processing, and the fastest processing refers to a block in the case of a block of 8 lines. Points to the first line.
[0071]
As a prerequisite to which the present invention is applied, it is necessary for the video signal flowing on the video bus 100 to continuously output data of the same frame during the period of still image compression. In the still image recording device, an image to be captured on a display device such as a liquid crystal is displayed for several seconds after the shooting button is pressed.
[0072]
In addition, since a moving image recording apparatus such as a video camera has a pause function, it is possible to continuously flow the same frame of data to the video bus 100, and it is also possible for the user to record a still image during recording. It is natural that the information is displayed on a display device such as a liquid crystal in order to indicate that there is a certain effect, and there is no demerit due to the present method, and it can be said that the process is a normal process.
[0073]
According to the above-described first embodiment, the time required for the still image compression recording process in the related art is:
(Image data loading time) + (JPEG compression processing time) + (data writing time to memory card) (Equation 1)
And the required memory capacity is one screen (5 Mbit), but the time required for the still image compression and recording process in the present invention is as follows.
(Image data loading time) + (JPEG compression processing time) + (Data writing time to memory card) + (Image data loading overhead time)
... (Equation 2)
The required memory capacity is 8 lines (82 Kbit).
[0074]
According to the present invention, a significant memory reduction can be realized with only a slight increase in processing time as compared with the related art. (1 line: 640 dots x 16 bits)
Next, a second embodiment of the present invention will be described.
[0075]
In the present invention, data is taken in from the video bus 100, and data is usually transferred to the video bus in an interlaced format.
[0076]
However, since JPEG files are compressed in a non-interlaced format, it is necessary to rearrange the data when importing. Referring to FIG. 4 showing a timing chart of data rearrangement at the time of capturing, for example, when a memory for eight lines is used for still image compression processing, waiting times 20 and 21 occur in JPEG compression processing.
[0077]
As a method of apparently eliminating the waiting times 20 and 21, two memories for data storage are prepared, and data is stored in the other memory while compression processing is performed on one memory data. is there.
[0078]
Also in this case, the processing speed can be increased by selecting the line that can be fetched at the fastest speed and the fetching order of the odd / even lines in the uncompressed block by selecting the portion that can be fetched at the highest speed.
[0079]
Two buffer memories for storing data are prepared, each of which is a first line buffer and a second line buffer. Referring to FIG. 5, which shows a timing chart for explaining the operation for reducing the waiting time in the JPEG compression processing, first, image data is supplied in the order of odd-numbered lines and even-numbered lines in synchronization with the frame synchronization signal.
[0080]
The reading of each of the first line buffer and the second line buffer is performed based on a signal fetch instruction of the first line buffer when, for example, image data of an odd line is supplied in synchronization with the first frame synchronization signal. The first line buffer is caused to read image data of 1, 3, 5, and 7 lines, and the second line buffer is supplied with 9, 11, 13, and 15 lines of image data on the basis of a signal acquisition instruction of the second line buffer. Load image data.
[0081]
When the image data of the even line is given after the odd line, the first line buffer is caused to read the image data of 2, 8, 10, and 12 lines based on the second signal fetch instruction of the first line buffer. Then, the image data of 10, 12, 14, and 16 lines is read into the second line buffer based on the instruction to take in the second signal of the subsequent second line buffer.
[0082]
By the above-described reading operation, image data of eight lines 1, 2, 3, 4, 5, 6, 7, and 8 is stored in the first line buffer at this time, and 9 lines are stored in the second line buffer. , 10, 11, 12, 13, 14, 15, and 16 are stored.
[0083]
On the other hand, in the compression processing operation, after the above-described image data of the even-numbered line is captured based on the second capture instruction signal, the first line buffer is synchronized with the falling timing of the second capture instruction signal. , The compression process for eight lines 1 to 8 stored in the storage device is started. Simultaneously with the start of the compression processing, the above-described image data of 10, 12, 14, and 16 lines is taken into the second line buffer.
[0084]
At the same time when the compression of the image data stored in the first line buffer is completed, the compression processing for 8 to 9 to 16 lines stored in the second line buffer is started, and the next image data indicated after the start Based on the fetch instruction, as the image data at that timing (corresponding to the above-described fastest data), the data of four lines of 18, 20, 22, and 24 of the even lines of the second frame is input. The data is stored in the first line buffer.
[0085]
Subsequently, when the data of the odd-numbered line of the third frame is given, the image data of the four lines of 19, 21, 23, and 25 of the odd-numbered line is fetched based on the fetch instruction to the first line buffer. At this time, the data stored in the first line buffer is data for eight lines of 18 to 24.
[0086]
After the capture of the odd-numbered data of the third frame is completed, the compression processing for the previous 8 lines of 9 to 16 is completed, so that the image data of 8 to 18 lines stored in the first line buffer is immediately stored. Compress.
[0087]
With the above-described compression processing progressing, for example, when data of the odd-numbered line of the sixth frame is given, four odd-numbered lines 41, 43, 45, and 47 based on a fetch instruction to the second line buffer. Import image data. Subsequently, based on the given instruction to capture the image data of the even-numbered lines, the image data of four lines of 42, 44, 46 and 48 of the even-numbered lines is captured.
[0088]
At this time, the data stored in the second line buffer is data for eight lines 41 to 48.
[0089]
After the capture of the data of the even-numbered lines of the sixth frame is completed, the compression processing of the previous eight lines of 17 to 24 is completed, so the eight lines of 41 to 48 stored in the second line buffer are immediately processed. Compress image data. Since the above-described compression processing is repeatedly performed until a necessary frame, the compression processing is performed after the signal is fetched according to the first embodiment without any waiting time as shown in FIG. 4 according to the first embodiment. It detects data that can start capturing at the earliest time, sequentially captures and compresses the data, thereby reducing the processing waiting time.
[0090]
Next, a third embodiment of the present invention will be described.
[0091]
In digital cameras, compression (final compression) when finally recorded as a JPEG file requires that data processing be performed in the order of screen scanning (upper left to right, upper to lower). According to the method of the present invention, since the data compression processing is not performed in the screen scanning order, it is difficult to apply the present invention as it is.
[0092]
However, by having a sufficient memory capacity for the data size after JPEG compression instead of the image memory for one screen, the data is rearranged when writing to the memory card after all the compression processing is completed. The present invention can be applied.
[0093]
That is, referring to FIG. 6 which shows a flowchart for explaining the operation of the third embodiment, a signal for starting to capture a still image is input from the system microcomputer (processing step A-1). The data sent from the CAM signal processing circuit 12 to the video bus 100 is read into the video I / F 31, and the current number of lines is detected (processing step A-2). By detecting the current number of lines, the number of leading lines that can be JPEG compressed at the highest speed is determined (processing step A-3).
[0094]
It is determined whether or not the data of the line has been subjected to compression processing (processing step A-4). If the compression processing has been completed, the processing target is set to the number of lines of the next block (processing step A-5), and it is determined again whether the compression processing has been performed (processing step A-4).
[0095]
If the compression processing has not been completed, the data from the line is fetched into the line buffer 32 via the video I / F 31, and compression processing is performed by the JPEG codec unit 33 (processing step A-6).
[0096]
A block number is added as a header to the compressed block and its data (processing step B-1).
[0097]
Next, it is determined whether the compression processing of all the blocks has been completed (processing step A-8). If the compression processing of all the blocks has not been completed, the process returns to processing step A-2, and the compression processing has been completed. In this case, it is completed.
[0098]
After the compression processing is completed for all the blocks, the data is read out at the time of recording in the memory card in the order of the numbers (processing step B-2).
[0099]
In this case, since the required memory is about the size of the data size after compression, the influence on the cost can be suppressed, and the time required for the entire processing can be reduced. Further, since only the number of processing steps B-4 is increased with respect to the number of pre-compression processing steps in FIG. 3 described above, the processing flows of pre-compression and main compression can be performed by almost the same processing, so that the program size can be reduced. Is also possible.
[0100]
【The invention's effect】
As described above, in the moving image recording / reproducing apparatus, the still image compression / recording method and the program according to the present invention, the compressed data is stored in the JEPG file in the order of the screen operation, but the compressed data is necessary in the pre-compression. Focusing on the fact that the data size after compression is necessary, at the stage of pre-compression, when the compression processing of a certain processing unit is completed, the line transferred to the video bus is determined, and then the fastest capture is possible Performing processing from the line has the effect of reducing the time required to compress the entire screen.
[0101]
Conventionally, the required memory capacity is one screen (5 Mbits). However, the time required for the still image compression recording process in the present invention is (image data import time) + (JPEG compression processing time) + ( The time required for writing data to the memory card) + (overhead time for loading image data), and the required memory capacity is eight lines (82 Kbits), contributing to a reduction in memory capacity.
[0102]
Also, a block number is added as a header to the compressed block and its data, and after all blocks have been subjected to the compression processing, the data is read out at the time of recording on the memory card in the order of the number. Thus, since the required memory is about the size of the data size after compression, the influence on the cost can be suppressed, and the time required for the entire processing can be reduced.
[Brief description of the drawings]
FIG. 1 is a block diagram of a first embodiment of the present invention.
FIG. 2 is a timing chart for explaining the operation of the first embodiment of the present invention.
FIG. 3 is a flowchart of a pre-compression process.
FIG. 4 is a timing chart for rearranging data at the time of capturing.
FIG. 5 is a timing chart for explaining an operation for reducing a waiting time in JPEG compression processing.
FIG. 6 is a timing chart for explaining the operation of the third embodiment.
FIG. 7 is a diagram showing a general configuration of a conventional DVC having a still image recording function.
[Explanation of symbols]
10 Camera block
11 CCD
12 CAM signal processing
13 Camera image memory
14 CAM control microcomputer
20 VTR block
21 VTR signal processing
22 Work memory
23 VTR control microcomputer
24 LCD
25 TAPE
30 DSC block
31 Video I / F section
32 line buffers
33 JPEG Codec
34 Memory Card
50 Serial communication bus line
100, 1_100, 2_102 Video bus

Claims (17)

The externally input moving image information is recorded in moving image recording means via a bus line, and eight lines of image data are fetched as one block from the moving image information on the bus line, and a still image is compressed for each block. As a means for suppressing the compression time of the entire screen when recording in the recording means, the order of capturing the blocks to be compressed is not random, and any arbitrary timing that matches the first signal capturing instruction timing after image data compression for one arbitrary block is performed. A moving image recording / reproducing apparatus, comprising: a pre-compression unit that uses line image data as head data of a next fetch block. When the externally input moving image information is recorded in the moving image recording means via the video bus line, and arbitrary image data is taken in from the moving image information on the video bus line, the still image is compressed and recorded in the still image recording means. As a means for suppressing the compression time of the entire screen, eight lines of image data are fetched into the line buffer means as one block, and when the compression operation of one block of image data is completed, the next fetch of the block which can start the earliest is started. A moving image recording / reproducing apparatus comprising a pre-compression means for detecting image data from image data of the remaining blocks, taking in the image data, and compressing the image data. The pre-compression control unit includes a video interface unit that captures the image data from the video bus, a line buffer unit that temporarily stores the image data of eight lines, and a compression unit that performs a compression process based on a still image compression standard. 3. The moving image recording / reproducing apparatus according to claim 1, further comprising: a memory card for storing compressed eight lines of image data. When the externally input moving image information is recorded in the moving image recording means via the video bus line, and arbitrary image data is taken in from the moving image information on the video bus line, the still image is compressed and recorded in the still image recording means. As a means for suppressing the compression time of the entire screen, when sequentially taking the interlaced moving image information for eight lines into the first and second line buffer means in response to the read instruction signals for the odd and even lines, one line buffer means A moving picture characterized by having a pre-compression control means provided with a function of suppressing a fetch waiting time for storing the interlaced moving picture information of odd and even lines in the other line buffer means while performing a compression process on memory data. Recording and playback device. The pre-compression means having the function of suppressing the capture waiting time starts the next capture as soon as the operation of compressing one block of image data on the memory data of the one line buffer means is completed. 5. The moving picture recording / reproducing apparatus according to claim 4, further comprising a function of alternately repeating an operation of reading out possible odd or even line image data from the other line buffer means and compressing the read image data. When externally input moving image information is recorded in moving image recording means via a video bus line, and when any image data is taken in from the moving image information on the video bus line and the still image is compressed and recorded in the still image recording means, A moving image recording / reproduction function for adding a block number to the compression target block and its data and recording the compressed data read out in the order of the block number on a memory card after all the compression processing is completed. apparatus. When externally input moving image information is recorded in moving image recording means via a video bus line, and when any image data is taken in from the moving image information on the video bus line and the still image is compressed and recorded in the still image recording means, Using the pre-compression means, the eight lines of image data are fetched into the line buffer means as one block, and the image data of the block from which the next fetch can be started as soon as the compression operation of one block of image data is completed. A still image compression recording method for a moving image recording / reproducing apparatus, which detects, captures, and compresses from the image data of the remaining blocks. When externally input moving image information is recorded in moving image recording means via a video bus line, and when any image data is taken in from the moving image information on the video bus line and the still image is compressed and recorded in the still image recording means, When pre-compression control means is used to sequentially load eight lines of interlaced moving image information into the first and second line buffer means in response to odd and even line read instruction signals, the memory of one of the line buffer means is used. A still image compression / recording method for a moving image recording / reproducing apparatus, wherein the interlace moving image information of odd and even lines is stored in the other line buffer means while compressing data is being executed, thereby suppressing a waiting time for taking. At the time when the operation of compressing the image data for one block on the memory data of the one line buffer means is completed, the image data of the odd or even line from which the next capture can be started earliest is transferred to the other line buffer. 9. A still image compression and recording method for a moving image recording and reproducing apparatus according to claim 8, wherein the operation of reading and compressing from the means is alternately repeated. When externally input moving image information is recorded in moving image recording means via a video bus line, and when any image data is taken in from the moving image information on the video bus line and the still image is compressed and recorded in the still image recording means, A block of a moving picture recording / reproducing apparatus, wherein a block number is added to a block to be compressed and its data, and after the compression process is completed, the compressed data read out in the order of the block number is recorded on a memory card. Image compression recording method. When externally input moving image information is recorded in moving image recording means via a video bus line, and when any image data is taken in from the moving image information on the video bus line and the still image is compressed and recorded in the still image recording means, A block number is added to the block to be compressed and its data, and the block number is temporarily stored in a memory unit. After all the compression processing is completed, the compressed data read out from the memory unit in the order of the block number is recorded on a memory card. A still image compression recording method for a moving image recording / reproducing apparatus, characterized in that: When the externally input moving image information is recorded in the moving image recording means via the video bus line, and arbitrary image data is taken in from the moving image information on the video bus line, the still image is compressed and recorded in the still image recording means. In order to suppress the compression time of the entire screen, eight lines of image data are fetched into the line buffer means as one block, and the next fetch can be started as soon as the compression operation of one block of image data is completed. A pre-compression processing step of detecting and taking in the image data of the block from the image data of the remaining blocks, and compressing the data; adding a block number to the compressed data, temporarily storing the data in a memory means; Recording the compressed data read out from the memory means in the order of the block numbers on a memory card after the processing is completed. Still image compression method for recording video recording reproducing apparatus and a management process. The processing performed by the pre-compression means includes a video interface means for taking in the image data from the video bus, a line buffer means for temporarily storing the image data for eight lines, and a compression processing based on a still image compression standard. Using a compression unit and a memory card that stores compressed eight lines of image data,
A processing step of inputting a signal for starting capture of a still image from a CPU of the moving image recording / reproducing device;
Reading the image data on the video bus into the video interface means, and detecting the current number of lines;
A processing step of determining whether or not the data of the detected line has been subjected to compression processing;
A processing step of setting the processing target to the number of lines of the next block if the compression processing has been completed;
A processing step of determining whether or not the compression processing has been performed again;
If the compression processing has not been completed, a processing step of fetching data from the unfinished line into the line buffer means and performing compression processing by the compression means;
13. A step of setting a block after compression processing as processed, and repeating a processing step of adding a data size after compression to a total size variable until all blocks to be compressed are completed. The still image compression recording method of the moving image recording / reproducing apparatus described in the above. The main compression processing step includes a video interface unit that captures the image data from the video bus, a line buffer unit that temporarily stores the image data for eight lines, and a compression unit that performs a compression process based on a still image compression standard. And a processing step of inputting a still image capture start signal from a CPU of the moving image recording / reproducing apparatus using a memory card that stores compressed eight lines of image data;
Reading the image data on the video bus into the video interface means, and detecting the current number of lines;
A processing step of determining whether or not the data of the detected line has been subjected to compression processing;
A processing step of setting the processing target to the number of lines of the next block if the compression processing has been completed;
A processing step of determining whether or not the compression processing has been performed again;
If the compression processing has not been completed, a processing step of fetching data from the unfinished line into the line buffer means and performing compression processing by the compression means;
A processing step of adding the block number as a header to the compressed block and its data,
A processing step of setting the block after compression processing as processed, and repeating the processing step of adding the data size after compression to the total size variable until all blocks to be compressed are completed;
13. The still image compression / recording method for a moving image recording / reproducing apparatus according to claim 12, wherein after all the blocks have been subjected to the compression processing, a processing step is performed in which the order in which data is read out at the time of recording to the memory card is the numerical order. . When the externally input moving image information is recorded in the moving image recording means via the video bus line, and arbitrary image data is taken in from the moving image information on the video bus line, the still image is compressed and recorded in the still image recording means. In order to suppress the compression time of the entire screen, eight lines of image data are fetched into the line buffer means as one block, and the next fetch can be started as soon as the compression operation of one block of image data is completed. A pre-compression processing step of detecting and taking in the image data of the block from the image data of the remaining blocks, and compressing the data; adding a block number to the compressed data, temporarily storing the data in a memory means; Recording the compressed data read out from the memory means in the order of the block numbers on a memory card after the processing is completed. A management step, a program to be executed by the CPU of the video recording and reproducing apparatus. As the processing steps performed by the pre-compression means, a video interface means for taking in the image data from the video bus, a line buffer means for temporarily storing the image data for eight lines, and a compression processing based on a still image compression standard Using a compression unit and a memory card that stores compressed eight lines of image data,
A processing step of inputting a signal for starting capture of a still image from a CPU of the moving image recording / reproducing device;
A processing step of reading the moving image data on the video bus into the video interface means and detecting a current number of lines;
A processing step of determining whether or not the data of the detected line has been subjected to compression processing;
A processing step of setting the processing target to the number of lines of the next block if the compression processing has been completed;
A processing step of determining whether or not the compression processing has been performed again;
If the compression processing has not been completed, a processing step of fetching data from the unfinished line into the line buffer means and performing compression processing by the compression means;
A moving image recording / reproducing apparatus which sets a block after compression processing as processed, and repeats a processing step of adding a data size after compression to a total size variable until all blocks to be compressed are completed. The program according to claim 16, which is executed by a CPU. Video interface means for taking in the image data from the video bus, line buffer means for temporarily storing the image data for eight lines, and compression means for performing compression processing based on a still image compression standard as the main compression processing step And a memory card that stores compressed 8 lines of image data,
A processing step of inputting a signal for starting capture of a still image from a CPU of the moving image recording / reproducing device;
Reading the image data on the video bus into the video interface means, and detecting the current number of lines;
A processing step of determining whether or not the data of the detected line has been subjected to compression processing;
A processing step of setting the processing target to the number of lines of the next block if the compression processing has been completed;
A processing step of determining whether or not the compression processing has been performed again;
If the compression processing has not been completed, a processing step of fetching data from the unfinished line into the line buffer means and performing compression processing by the compression means;
A processing step of adding the block number as a header to the compressed block and its data,
A processing step of setting the block after compression processing as processed, and repeating the processing step of adding the data size after compression to the total size variable until all blocks to be compressed are completed;
17. The program according to claim 16, wherein, after the compression processing for all blocks is completed, a processing step of setting the order of reading data when recording to the memory card to the numerical order is executed by the CPU of the moving image recording / reproducing apparatus. .

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