JP3590677B2 - Digital image data recording apparatus and method and digital image data reproducing apparatus and method - Google Patents

Description

[0001]
【Technical field】
According to the present invention, an original image represented by given image data is divided into a plurality of areas, a predetermined number of the plurality of areas are extracted to form a group, and the image data of the group is converted to a predetermined data. The present invention relates to an apparatus and a method for compressing data to be recorded in a recording medium and recording the compressed image data, and an apparatus and a method for reproducing compressed image data thus recorded on a recording medium.
[0002]
BACKGROUND OF THE INVENTION
Since the amount of image data is enormous, a digital video tape recorder (DVTR) that records the image data on a video tape performs data compression of the image data. This data compression processing is performed, for example, as follows (shuffling).
[0003]
First, an image for one screen is divided into DCT (Discrete Cosine Transform) blocks of 8 × 8 pixels. One macro block is composed of four luminance blocks and two chrominance blocks RY and BY among the DCT blocks. When the macro blocks are formed for all the images of one screen, five macro blocks are extracted so as not to be biased only from a part of the image. Data compression is performed so that the data amount of the image data of the five macro blocks becomes a predetermined data amount. Macro block extraction and data compression processing are performed on all images for one screen.
[0004]
If the image portion of the five macro blocks has high definition, the amount of image data after data compression becomes large, so that high-frequency component image data is truncated. For this reason, DCT noise appears during recording and reproduction of a high-definition image, and the image may be broken. .
[0005]
DISCLOSURE OF THE INVENTION
SUMMARY OF THE INVENTION It is an object of the present invention to perform data compression in accordance with a conventional image data compression technique and to enable reproduction of a high-definition image without failure.
[0006]
In the digital image data recording method according to the first invention, the original still image represented by the original still image data is divided into a plurality of n or more areas (macro blocks), and the original still image divided into a plurality of areas is provided. , And one group image data is formed from the image data of the n areas, and the images of the other areas excluding at least one of the n areas belonging to the group are extracted. The high-frequency component of the data is removed, and the group image data including the image data of the area from which the high-frequency component has been removed is subjected to data compression so as to have a predetermined data amount. While changing the area to be extracted, the group image data forming process, the high frequency component removing process, and the data compressing process are repeated. The repetitive control process is performed, and the obtained compressed image data of one image is recorded in a recording area of one or more images on a recording medium, and the same (n-1) original still images as the original still images are recorded. For each of the images, the area division processing, the group image data formation processing, the high-frequency component removal processing, and the data compression processing are performed while making the combination of the areas forming the groups the same and changing the area from which the high-frequency components are removed. By performing the above-described iterative control processing, compressed image data for (n-1) images is obtained, and the compressed image data for these (n-1) images is converted to the (n-1) images or more for the recording medium. It is characterized by recording in a recording area.
[0007]
Preferably, the compressed image data of n frames recorded on the recording medium is read, the read compressed image data is expanded, and the image data of n frames expanded by the image data expansion process is read. Image data representing the image of the area where the high-frequency component remains is extracted, and the image data representing the still image is constructed and output from the image data obtained by the high-frequency component image data extraction processing.
[0008]
The first invention also provides an apparatus for implementing the above method. That is, the image dividing means for dividing the original still image represented by the original still image data into a plurality of n or more areas (macro blocks). a group image data forming means for extracting n areas and forming one group image data by the image data of the n areas; a group image forming means for removing at least one area among the n areas belonging to the group; High-frequency component removing means for removing the high-frequency component of the image data of the area, and the group image data including the image data of the area from which the high-frequency component has been removed by the high-frequency component removing means is set to a predetermined data amount. Data compression means for compressing the data in all areas of the original still image Meanwhile, iterative control means for performing iterative control processing for repeating the group image data forming processing, the high-frequency component removing processing and the data compression processing, and a compressed image for one image obtained under the control of the iterative control means First recording control means for recording data in a recording area of at least one image on a recording medium, and an area for forming the group for each of the same (n-1) original still images as the original still images By performing the area division processing, the group image data formation processing, the high frequency component removal processing, the data compression processing, and the iterative control processing while making the combination of the same and changing the area from which the high frequency component is removed, ( (n-1) compressed image data for the image is obtained, and the compressed image data for the (n-1) image is stored in the (n- ), Characterized in that it comprises a second recording control means for recording the image content or more recording areas.
[0009]
Preferably, reading means for reading compressed image data of n frames recorded on the recording medium, image data expanding means for expanding data of the compressed image data read by the reading means, and data expanded by the image data expanding means. The high-frequency component image data extracting means for extracting image data representing the image of the area where the high-frequency component remains from the n frames of image data, and the image data output from the high-frequency component image data extracting means, The image processing device further includes image forming means for forming and outputting image data representing an image.
[0010]
According to the present invention, a group consisting of predetermined n areas is formed. The same group as this group is generated from n frames of still images in a number corresponding to the n areas constituting the group. Of the n groups, high-frequency components are removed from the image data such that different groups have different combinations of areas where high-frequency component image data is left and areas where high-frequency component image data is removed. In a predetermined area, high-frequency components of image data remain, and in other areas, image data of a group from which high-frequency components of image data have been removed is compressed so that the data amount becomes a predetermined data amount. Is recorded on a recording medium.
[0011]
When the compressed image data is recorded on the recording medium in this manner, the compressed image data is read from the recording medium at the time of reproduction, the data is decompressed, and the high-frequency component image data representing the area image is extracted while the high-frequency component remains. Is done. Image data representing an original image is formed from the extracted high-frequency component image data. The image data representing the original image is supplied to the printer, so that the original image is printed.
[0012]
Since all the image data representing the original image is composed of high-frequency component image data, a high-definition original image can be reproduced.
[0013]
At the time of compressing the image data, the high frequency component of the image data is left only in a predetermined area among the areas constituting the group, and the high frequency component of the image data is removed in other areas. For this reason, the image data amount of the group is relatively small. Even if the data amount of the image data of the group is compressed so that the data amount becomes a predetermined data amount, it is possible to prevent the image data of the high frequency component from being truncated. Since the image data representing the original image is constituted from the image data in which all the high-frequency components remain, a high-definition original image can be reproduced.
[0014]
In the above-described recording apparatus or recording method, high-frequency component removal processing is performed in the process of dividing an image and performing data compression processing. Division and data compression processing may be performed.
[0015]
In this case, the digital image data recording method and apparatus are configured as follows.
[0016]
The second invention is an image dividing means for dividing an original image represented by given image data into n or more areas, extracting n areas from the plurality of areas of the original image, Group image data forming means for forming one group image data from the image data of the area, data compressing means for compressing the group image data so as to have a predetermined data amount, all areas of the original image The repetition control means for repeatedly performing the group image data formation processing in the group image data formation means and the data compression processing in the data compression means while changing the area to be extracted, and the image data for one image obtained by the repetition control means. Recording control for recording compressed image data in a recording area of one or more images on a recording medium In a digital image data recording apparatus having a stage, n frames of still image data representing the same still image are provided, and the group image is formed by image data of an area at the same position from each of the n frames of still images. When n pieces of data are configured, in the group image data obtained from the still images of different frames, a high-frequency component-containing area for removing high-frequency components and a high-frequency component removal area for removing high-frequency components among the n areas belonging to the group. The positions of the areas on the still image are respectively calculated so that the combinations with are different from each other. By the area position calculation processing, n corresponding to the high-frequency component removal areas respectively at the positions calculated on the still images for n frames are calculated. The high-frequency components of the still image data for frames are removed, and the image data from which the high-frequency components have been removed is removed. The image data for n frames partially including the data is provided to the image dividing means for the image division, and the image dividing processing and the data compression processing in the data compressing means are performed. The image dividing means, the data compression means, the repetition control means and the recording control means are controlled so that the recording control means records the compressed image data in at least n frames of compressed image data recording areas.
[0017]
The second invention also provides an apparatus for implementing the above method. That is, an image dividing unit that divides an original image represented by given image data into a plurality of n or more areas, extracts n areas from the plurality of areas of the original image, and extracts images of the n areas. Group image data forming means for forming one group image data by data, data compressing means for compressing the group image data so as to have a predetermined data amount, and extracting all areas of the original image. Iterative control means for repeatedly performing the group image data forming processing in the group image data forming means and the data compression processing in the data compression means while changing the area, and the compressed image data for one image obtained by the repetition control means. Recording control means for recording in a recording area of one or more images on a recording medium In the digital image data recording apparatus provided, still image data representing the same still image is provided for n frames, and the group image data is divided by the image data of the area at the same position from each of the n still images. In the case of n-pieces, in the group image data obtained from the still images of different frames, a high-frequency component-containing area in which the high-frequency component remains among the n areas belonging to the group and a high-frequency component removal area in which the high-frequency component is removed are included. Area position calculating means for respectively calculating the position of the area on the still image so that the combination is different. Corresponding to the high-frequency component removal areas at the positions calculated on the still image for n frames by the area position calculating means. High-frequency component removing means for removing high-frequency components of the still image data for n frames The image data for n frames including a part of the image data from which the high-frequency component has been removed by the high-frequency component removing means is given to the image dividing means for the image division, and the image compression processing and the data compression in the data compression means The image dividing means, the data compression means, the repetition control means and the image processing means perform a process so that the obtained compressed image data for n frames or more is recorded in the compressed image data recording area for n frames by the recording control means. Means for controlling the recording control means.
[0018]
Also in the second invention, a reproduction function may be provided similarly to the first invention.
[0019]
Also in the second invention, a high-definition still image can be reproduced.
[0020]
By removing the high-frequency components by collecting the areas where the high-frequency components are left, a partial image area is formed when the image is divided into n pieces. It is preferable to remove the image data of the high frequency component so as to form different image regions.
[0021]
Thus, when the reproduction of the original image is shifted to the reproduction of the moving image, the reproduction can be naturally shifted to the reproduction of the moving image.
[0022]
The high-frequency component removal processing is performed such that the high-frequency component image data of the group image data is left in different areas of the n groups formed of n images, so that the image data of the high-frequency component remains in different areas. The color data may be removed.
[0023]
As a result, the reproduced image changes from a color image to a black and white image.
[0024]
Further, fine image data representing the same still image and having a data amount m times as large as the data amount of the unit image data is given. The above fine image data is divided into m pieces so that each represents one frame of image. Performing unit image data division processing for dividing the image data into unit image data, and performing the area division processing to divide a divided image represented by the unit image data divided by the image data division processing into a plurality of areas. In the recording control process, the compressed image data for the m × n unit image data output from the data compression unit may be recorded in at least m × n unit image data recording areas of the recording medium.
[0025]
According to the current standard of the DVTR, image data of about 350,000 pixels of 720 pixels in the horizontal direction and 480 pixels in the vertical direction is recorded in the unit recording area of the video tape as unit image data. On the other hand, in order to obtain a high-definition image, it is sufficient to generate image data having a large data amount. However, since the standard of the DVTR is fixed, it is not possible to record a large amount of image data on a video tape.
[0026]
In the above, a fine image having a data amount n times the data amount of the unit image data is provided. This fine image data is divided so as to have a data amount of unit image data. The divided image data is subjected to image division, area image data extraction processing, high-frequency component removal processing, and data compression processing, and the compressed image data is recorded in n unit image areas.
[0027]
Image data representing a high-definition image can be recorded according to the current standard. Also in this case, since the image data representing the original image can be formed from the image data in which all the high frequency components remain, an extremely fine image can be reproduced.
[0028]
In the above description, the playback function may be added to the image data recording device, or the playback device may be configured independently.
[0029]
That is, in the reproduction method, the original still image represented by the original still image data is divided into n or more areas, and n areas are extracted from the original still image divided into a plurality of areas. One group image data is formed by the image data of the n areas, and the high frequency components of the image data of the other areas excluding at least one of the n areas belonging to the group are removed, and the high frequency components are removed. The group image data including the image data of the area from which the image data has been removed is compressed so as to have a predetermined data amount. For all areas of the original still image, the group image data is changed while changing the area to be extracted. An iterative control process for repeating the data forming process, the high frequency component removing process, and the data compressing process is performed. The obtained compressed image data of one image is recorded in a recording area of one or more images of the recording medium, and the above-mentioned group is formed for each of the same (n-1) original still images as the original still images. By performing the area division processing, the group image data formation processing, the high frequency component removal processing, the data compression processing, and the iterative control processing while making the combination of areas to be performed the same and changing the area from which high frequency components are removed. , (N-1) images are obtained, and the compressed image data corresponding to the (n-1) images is recorded in a recording area of the recording medium equal to or more than the (n-1) images. The compressed image data for n frames is read from the medium, the read compressed image data is decompressed, and the image data for n frames decompressed by the image data decompression process is read. Extracting image data representing an image of an area where a high-frequency component remains, and constructing and outputting image data representing the still image from the image data obtained by the high-frequency component image data extraction processing. And
[0030]
The playback device may be configured alone. That is, the original still image represented by the original still image data is divided into a plurality of n or more areas, and n areas are extracted from the original still image divided into the plurality of areas, and the n areas are extracted. Group image data is formed by the image data of the above, the high frequency components of the image data of the other areas except at least one of the n areas belonging to the group are removed, and the high frequency components are removed. The group image data including the area image data is compressed so as to have a predetermined data amount, and the group image data forming process is performed for all areas of the original still image while changing the area to be extracted. An iterative control process for repeating the high-frequency component removal process and the data compression process is performed. Compressed image data for one image is recorded in one or more recording areas of the recording medium, and for each of the same (n-1) original still images as the original still image, a combination of areas forming the group By performing the area division processing, the group image data formation processing, the high frequency component removal processing, the data compression processing, and the iterative control processing while changing the area from which the high frequency component is removed. 1) Compressed image data for an image is obtained, and the compressed image data for the (n-1) images is recorded on a recording medium in a recording area equal to or more than the (n-1) image. Reading means for reading compressed image data of a minute, data expanding means for expanding data of the compressed image data read by the reading means, and data by the image data expanding means. Image data extracting means for extracting image data representing an image of an area in which a high-frequency component remains from image data for frames; image data representing the still image from image data output from the high-frequency component image data extracting means; And an image composing means for composing and outputting.
[0031]
[Explanation of the embodiment]
Before describing the configuration and operation of the digital video tape recorder, an existing standard industry standard relating to a recording method on a magnetic tape by the digital video tape recorder will be described.
[0032]
The recording format of the magnetic tape is shown in FIGS. 14 (A) and (B). FIG. 14A shows the tracks Tr of the magnetic tape 8, and a large number of tracks Tr are formed at a fixed angle in the oblique direction with respect to the longitudinal direction of the magnetic tape 8. Digital image data for one frame is recorded using ten consecutive tracks among these many tracks Tr.
[0033]
FIG. 14B shows the track format. One track Tr includes a subcode recording area, a video recording area, an auxiliary recording area, an audio recording area, and a track information recording area. Information such as a time code and an absolute track number for high-speed search is recorded in the subcode recording area. Digital image data representing a subject image is recorded in the video recording area. Data representing a sound is recorded in the audio recording area. In the track information recording area, information serving as a reference of the track Tr for the magnetic head to trace the center of the track Tr is recorded. The auxiliary recording area is provided at intervals, and additional information is recorded in the auxiliary recording area. The illustration of the gaps provided between the respective regions is omitted.
[0034]
The CCD used for the image pickup unit of the digital video tape recorder is generally (conventional) a horizontal CCD transfer clock frequency of 13.5 MHz, and has about 350,000 pixels of 720 pixels in the horizontal direction and 480 pixels in the vertical direction. Is used. One frame of digital image data obtained using such a CCD is recorded on ten tracks of the magnetic tape 8. This is an existing standard.
[0035]
FIG. 1 is a block diagram showing the electrical configuration of a digital video tape recorder.
[0036]
The digital video tape recorder shown in FIG. 1 is capable of recording digital image data on the magnetic tape 8 and reproducing digital image data recorded on the magnetic tape 8. Further, the digital video tape recorder shown in FIG. 1 can record and reproduce a still image in addition to recording and reproducing a moving image.
[0037]
In the digital video tape recorder shown in FIG. 1, an image of a subject is imaged using an existing standard CCD of approximately 350,000 pixels of 720 pixels in the horizontal direction and 480 pixels in the vertical direction. In addition to being able to record data on the magnetic tape 8, in both the horizontal and vertical directions, the number of pixels in the horizontal direction is twice as large as that of the CCD of the existing standard. The subject can be imaged using the CCD and image data representing a high-definition subject image can be recorded on the magnetic tape 8.
[0038]
First, a case where a moving image of a subject is recorded using a CCD having about 350,000 pixels of 720 pixels in the horizontal direction and 480 pixels in the vertical direction will be described.
[0039]
The digital video tape recorder includes a setting switch 61 for setting a moving image recording mode and a setting switch 62 for setting a still image recording mode. A signal representing the settings of setting switches 61 and 62 is applied to still image switching controller 60.
[0040]
When the setting switch 61 is set, a moving image recording mode is set. In the moving image recording mode, the subject is photographed by the CCD 11 at a period of 1/30 second. A video signal representing a subject image is output from the CCD 11 and supplied to a signal processing circuit 13 included in a DSP (Digital Signal Processor) 12.
[0041]
The signal processing circuit 13 includes an analog / digital conversion circuit, a gamma correction circuit, a white balance adjustment circuit, etc., and performs digital conversion processing, gamma correction processing, and white balance of a video signal input to the signal processing circuit 13. Adjustment processing and the like are performed. The signal processing circuit 13 further includes an automatic exposure adjustment circuit, an automatic focusing circuit, an automatic iris adjustment circuit, and the like, and performs automatic exposure adjustment, automatic focusing processing, automatic iris adjustment, and the like based on an input video signal. Done.
[0042]
Image data output from the signal processing circuit 13 is provided to an image memory 16 controlled by a memory controller 14. The image memory 16 has a capacity to store image data of about 350,000 pixels of 720 pixels in the horizontal direction and 480 pixels in the vertical direction.
[0043]
When the moving image recording mode is set, the changeover switches 17 and 18 are connected to the terminal a. In the recording mode, the changeover switch 41 is connected to the terminal a.
[0044]
The image data read from the image memory 16 is supplied to the shuffling and deshuffling circuit 31 via the changeover switches 17 and 18. The image data read from the image memory 16 is supplied to a digital / analog conversion circuit 42 via a changeover switch 41. In the digital / analog conversion circuit 42, the digital image data is converted into an analog video signal. The video signal is provided to the monitor display device 43, and a subject image is displayed. Thus, the subject being photographed is confirmed.
[0045]
In a digital video tape recorder, one screen is divided into 8 × 8 pixel DCT (Discrete Cosine Transform) blocks, and four DCT blocks for luminance and color difference for RY and BY are used. One macro block is composed of two DCT blocks, one super block is composed of 27 macro blocks, and five macro blocks are extracted from different super blocks. The image data is compressed so that the data amount of the image data representing the five macro blocks (hereinafter, referred to as a group) becomes a predetermined data amount. A circuit that performs a DCT block configuration, a macro block configuration, a super block configuration and a group extraction process is a shuffling and deshuffling circuit 31. The detailed operation of the shuffling and deshuffling circuit 31 will be described later.
[0046]
Image data output from the shuffling and deshuffling circuit 31 is supplied to the image memory 32 in units of macro blocks. Image data for one image is stored in the image memory 32.
[0047]
The image data stored in the image memory 32 is read out in units of groups and supplied to the compression / decompression circuit 33. In the compression / expansion circuit 33, data compression is performed so that the data amount of the image data of the group becomes a predetermined data amount (fixed length compression). The compressed image data passes through an error correction code addition and error correction circuit 34, is given to an image memory 35, and is temporarily stored therein. The compressed image data is read from the image memory 35 and applied to an error correction code addition and error correction circuit 34, where an error correction code is added.
[0048]
The image data to which the error correction code has been added is supplied to the modulation / demodulation circuit 36 and modulated. The modulated image data is amplified by a recording / reproducing amplifying circuit 37 and applied to a magnetic head 38. The video recording area A of the magnetic tape 8 is controlled by the magnetic head 38. ₂ The modulated image data is recorded in the.
[0049]
Next, the operation of the shuffling and deshuffling circuit 31 will be described.
[0050]
FIG. 3 is a flowchart showing a shuffling processing procedure.
[0051]
Before generating a DCT block, luminance data Y and RY and BY color difference data are generated from the image data input to the shuffling and deshuffling circuit 31. For the RY and BY color difference data, the thinning process is performed so that the image data having a data amount of 720 pixels in the horizontal direction and 480 pixels in the vertical direction has a data amount of 180 pixels in the horizontal direction and 480 pixels in the vertical direction. Done. When the process of generating the luminance data Y and the color difference data of RY and BY and the process of thinning out the color difference data are performed, the process of generating a DCT block is performed (step 65).
[0052]
FIG. 4A shows a screen represented by one frame of Y data, and FIG. 4B shows a screen represented by one frame of RY data or BY data.
[0053]
When the number of horizontal scanning lines is 525 and the field frequency is 60 Hz, the number of pixels of the Y data is 720 pixels in the horizontal direction and 480 pixels in the vertical direction. Therefore, the Y data is divided into 90 DCT blocks in the horizontal direction and 60 DCT blocks in the vertical direction as shown in FIG. The number of pixels of the RY data and the BY data is 180 pixels in the horizontal direction and 480 pixels in the vertical direction. Therefore, the RY data and the BY data are divided into 22.5 DCT blocks in the horizontal direction as shown in FIG. In addition, the right end block is a small block of 4 pixels in the horizontal direction and 8 pixels in the vertical direction, so one DCT block is generated from two small blocks as shown in FIG.
[0054]
When the DCT block is generated, a macro block generation process is performed (step 66).
[0055]
As shown in FIG. 6A, the macro block includes four DCT blocks for luminance and two DCT blocks for RY and BY color differences at the same position on the screen as the four DCT blocks. Consists of blocks. However, at the right end of the screen, it is not possible to extract four DCT blocks for luminances that are continuous in the horizontal direction, and therefore, as shown in FIG. A macro block is generated from the DCT block for the color difference at a position corresponding to the position of the DCT block for.
[0056]
When the macro block is generated, a super block is generated (step 67).
[0057]
As shown in FIG. 7, one screen is divided into 10 in the vertical direction and 5 in the horizontal direction to generate a super block. One super block is composed of 27 macro blocks. Superblocks generated in columns of j = 0 and j = 2 in the horizontal direction are formed so that the upper right corner protrudes as shown in FIG. Superblocks generated in columns of j = 1 and j = 3 in the horizontal direction are formed so that the lower left corner protrudes as shown in FIG. 8B. The super blocks generated in the column of j = 4 in the horizontal direction are formed in a rectangular shape as shown in FIG. In FIG. 7, a superblock specified by a code j in the horizontal direction and a superblock specified by a code i in the vertical direction is indicated by S (j, i).
[0058]
When a super block is generated, a group is generated (step 68). The segment is generated by extracting five macro blocks from different super blocks from among the many super blocks shown in FIG.
[0059]
FIG. 9 shows a group.
[0060]
A group is composed of five macro blocks. The macro block is composed of four DCT blocks for luminance and two DCT blocks for RY and BY color differences.
[0061]
In FIG. 9, a macro block number CM is a number indicating from which part on the screen shown in FIG. 7 a macro block should be extracted to form a group. Since the group is formed of five macro blocks, a macro block is specified by five macro block numbers CM. Macro block numbers CM (a, 2, k), CM (b, 1, k), CM (c, 3, k), CM (d, 0, k) and CM (e, 4, k) are respectively Identify the five macro blocks that form the group.
[0062]
The first letters a to e of the macro block number CM are determined by the following equations, respectively, and define the position of the super block from which the macro block is to be extracted in the vertical direction.
[0063]
(Equation 1)
a = (i + 2) mod 10 1
[0064]
(Equation 2)
b = (i + 6) mod 10 2nd formula
[0065]
(Equation 3)
c = (i + 8) mod 10 3rd formula
[0066]
(Equation 4)
d = (i + 0) mod 10 Equation 4
[0067]
(Equation 5)
e = (i + 4) mod 10...
[0068]
Here, i corresponds to the number of super blocks in the vertical direction, and 0 to 9 correspond.
[0069]
The second digit number (0 to 4) of the macro block number CM defines the position of the super block from which the macro block is to be extracted in the horizontal direction. The third letter k of the macro block number CM defines a macro block in the super block, and corresponds to a number from 0 to 26. The position of the superblock from which the macroblock is extracted is specified by the first and second digits of the macroblock number CM, and the position of the macroblock to be extracted in the superblock specified by the third digit is specified. The position is specified.
[0070]
A DCT block number F (n ₁ , N ₂ , N ₃ , N ₄ ) Is attached. DCT block number F (n ₁ , N ₂ , N ₃ , N ₄ ) Are given the same numbers as the macro block number CM from the first digit to the third digit. DCT block number F (n ₁ , N ₂ , N ₃ , N ₄ The fourth digit in the parentheses) specifies a DCT block, and is assigned a numerical value from 0 to 5. When the fourth digit number is 0, 1, 2, 3, 4, and 5, the first DCT block DCT0, the second DCT block DCT1, the third DCT block DCT2, and the third DCT block DCT2 for the luminance. The fourth DCT block DCT3, the fifth DCT block DCT4 for the color difference of RY, and the sixth DCT block DCT5 for the color difference of BY are specified.
[0071]
In any case, the macro block forming the segment is specified according to the macro block number, and the DCT block forming the macro block is specified according to the DCT block number. For example, if i = 0, superblocks of S (2,2), S (6,1), S (8,3), S (0,0) and S (4,4) are specified.
[0072]
The image data of the DCT block has 8 bytes × 8 bytes before compression, and 14 bytes × 1 byte for luminance data and 10 bytes × 1 byte for color difference data after compression.
[0073]
Further, the group includes information STA representing the result of error correction (this information is added in the error correction processing at the time of reproduction) and information QNO representing the control amount of the quantization step used at the time of data compression in the compression / decompression circuit 33. Are also provided.
[0074]
The image data representing the group formed in this way is supplied to the compression / expansion circuit 33 via the image memory 32, and the data is compressed so that the data amount of the image data representing the group is determined in advance. This data compression processing is performed as follows.
[0075]
First, image data representing a group is data-compressed at a predetermined compression ratio. When data is compressed at a predetermined compression ratio, the image data amount of each DCT block differs depending on the density of the image in each DCT block. The data amount of each DCT block after compression is determined in advance, and data overflowing in each DCT block is temporarily stored in a predetermined area for each macro block. If there is an empty area in each DCT block, the overflowed data is stored in the empty area in the same macro block corresponding to each macro block. If it does not fit in the empty area in the same macro block, it is stored in a predetermined area, and is stored in the empty area of the DCT block somewhere in the group. If there is still an overflow, the overflowed data is discarded. Thereby, the data amount of the image data of the segment after compression is made constant.
[0076]
FIGS. 10 to 12 show a process of extracting five macro blocks from image data of one screen in which a superblock is generated to generate a group, and compressing and predetermining image data obtained from the generated group. 10 is a flowchart showing a processing procedure for truncating overflow data exceeding a given data amount.
[0077]
10 to 12, i is the number of the position of the superblock in the vertical direction (in this case, i = 0 to 9 as shown in FIG. 7), and k is the number (k of the macroblock in the superblock) = 0 to 26), m is the number of the macro block in the group (m = 0 to 4), and l is the number of the DCT block in the macro block (l = 0 to 5). A to e are numbers indicating the positions in the vertical direction of the superblock from which the macro block is to be extracted, and are specified by the first to fifth expressions.
[0078]
Referring to FIGS. 7 and 9 in addition to FIGS. 10 to 12, the position number i of the vertical superblock is reset (step 71), and a macro block is extracted according to the first to fifth equations. A number indicating the position of the super block in the vertical direction is calculated (step 72). Also, the number k indicating the position of the macro block in the super block, the number m of the macro block in the group, and the number 1 of the DCT block in the macro block are reset (steps 73, 74, 75). As a result, the macro block number CM shown in FIG. 9 is determined, and five macro blocks are extracted from one screen to generate a segment.
[0079]
The image data of the five macro blocks constituting the generated segment is compressed at a predetermined compression ratio for each DCT block. The compressed image data is temporarily stored in a predetermined area for each DCT block. The data amount of image data to be stored in a predetermined area for each block is determined. For overflowed data, a first area predetermined for each macro block of the five macro blocks constituting the group Is stored once (step 76). The processing in step 76 is performed for all image data of the six DCT blocks of the macro block (steps 77 and 78), and is performed for all groups (steps 79 and 80).
[0080]
Subsequently, the number m of the macro block in the group and the number 1 of the DCT block in the macro block are reset again (steps 81 and 82). In step 76, the overflow data once stored is read. The same macro block as the DCT block in which the overflow data has occurred is stored in an empty DCT block area. If an overflow also occurs in this storage processing, the data is temporarily stored as remaining data in a second predetermined area defined for each group (step 83). The processing in step 83 is performed for all image data of the six DCT blocks of the macro block (steps 84 and 85), and is performed for all groups (steps 86 and 87).
[0081]
Subsequently, the number m of the macro block in the group and the number 1 of the DCT block in the macro block are reset again (steps 88 and 89). In step 89, the remaining data once stored for each group is read. The remaining data is stored in an empty DCT block area in the group (step 90). The processing in step 90 is performed for all image data of the six DCT blocks of the macro block (steps 91 and 92), and is performed for all groups (steps 93 and 94).
[0082]
If the remaining data does not fit in the empty area of the DCT block, the remaining data is truncated (step 95).
[0083]
The storage processing of the compressed image data as described above forms another group and is performed for all of one screen (steps 96 to 99).
[0084]
Referring to FIG. 1 again, the case where the still image recording mode is set by the still image mode setting switch 62 will be described.
[0085]
In the still image recording mode, in the DVTR in this embodiment, image data representing the same subject image is recorded on the magnetic tape 8 over five frames. FIGS. 13A to 13E show five frames of images representing the same subject image. In the DVTR according to the present embodiment, groups generated respectively in five frames of images representing the same subject image are composed of macro blocks at the same position. Of the five macro blocks constituting the group, only one macro block has the high frequency component of the image data in the macro block remaining, and the remaining four macro blocks have the high frequency components of the image data in the macro block. High frequency components are removed. The macroblock in which the high-frequency component remains is subjected to high-frequency component removal processing so as to be a different macroblock in a different image group. In FIGS. 13A to 13E, macro blocks in which high-frequency components remain are indicated by hatching, and macro blocks from which high-frequency components have been removed are indicated by blank frames. The high-frequency component of the image data of one macro block remains, and the image data of the group from which the high-frequency component of the image data has been removed is compressed for the remaining four macro blocks so that the data amount is constant. Is done. Since only the high-frequency component image data of one macro block remains, the image data of the group is not truncated in the data compression process.
[0086]
When the image data is recorded on the magnetic tape 8 over five frames in this way, at the time of reproduction, only the image data of the macro block in which the high-frequency component remains remains, and a high-definition still image is restored. .
[0087]
When a still image recording mode is set and a shutter release button (not shown) is pressed, a subject is imaged at the timing of the press, and image data representing the subject image is stored in the image memory 16. When the image recording mode is set, the changeover switches 17 and 18 are connected to the terminals b by the still image changeover controller 60. The image data stored in the image memory 16 is read out and given to the specific macro block processing circuit 20 in the segment.
[0088]
As shown in FIGS. 13A to 13E, the specific intra-group specific macro block processing circuit 20 determines the high frequency component of the image data of one specific macro block among the five macro blocks forming the group. This is a circuit for removing the high frequency components of the image data of the remaining four macro blocks. FIG. 2 shows a detailed diagram of the intra-group specific macro / block processing circuit 20, which will be described later. The output image data of the specific intra-group macro / block processing circuit 20 is supplied to the shuffling and deshuffling circuit 31 via the changeover switch 18.
[0089]
The processing after the shuffling and deshuffling circuit 31 is the same as in the moving image recording mode even in the still image recording mode. Image data output from the intra-group specific macro / block processing circuit 20 passes through an image memory 32 where DCT block generation processing, macro block generation processing, super block generation processing, and group generation processing are performed in a shuffling and deshuffling circuit 31. To the compression / decompression circuit 33. In the compression / expansion circuit 33, data compression is performed so that the data amount of the image data of the group becomes constant. In the intra-group specific macro block processing circuit 20, since the high frequency components of the image data of four of the five macro blocks constituting the group have been removed, the truncation of the image data at the time of data compression processing has been eliminated. Is prevented.
[0090]
With reference to FIG. 2, the in-group specific macro block processing circuit 20 will be described.
[0091]
The intra-group specific macro block processing circuit 20 detects image data of a macro block from which high frequency components are to be removed among the macro blocks forming the group, and removes the high frequency components of the detected image data.
[0092]
The intra-segment specific macro / block processing circuit 20 includes a high frequency removal macro / block phase calculation circuit 26. The high frequency elimination macro / block phase calculation circuit 26 is supplied with a still image recording mode setting signal from the still image switching controller 60, and is supplied with the pixel clock signal CK, the horizontal synchronization signal H, and the vertical synchronization signal V from the signal processing circuit 13. ing. The macro block data change phase calculation circuit 26 operates when a still image recording mode setting signal is given from the still image switching controller 60. As shown in FIGS. 13A to 13E, the high-frequency removing macro / block phase calculating circuit 26 calculates five images of the same subject based on the input clock signal CK, horizontal synchronizing signal H and vertical synchronizing signal V. When a group is composed of the same macro block, the high frequency components of the image data of the different macro blocks remain in the groups of different frames, and the high frequency components of the image data of the other macro blocks are removed. The position of the image data from which the high frequency component is removed in the frame image is calculated. A phase signal indicating the position of the image data from which the high-frequency component is removed in the frame image is supplied to the changeover switches 24 and 25 as a changeover control signal, and an error correction code is added as auxiliary area data recorded on the auxiliary area of the magnetic tape 8. And an error correction circuit 34.
[0093]
The high frequency removal macro block phase calculation circuit 26 also outputs the same image identification data indicating that the image data represents the same subject image. The same image identification data is also supplied to the error correction code addition and error correction circuit 34 as auxiliary area data.
[0094]
The changeover switches 24 and 25 are connected to the b-terminal side when the image data for removing the high-frequency component is input to the intra-group specific macro-block processing circuit 20 based on the phase signal supplied from the high-frequency removal macro / block phase calculation circuit 26. When the image data to be connected and leaving the high frequency component is input to the specific macro / block processing circuit 20 in the group, the terminal a is connected.
[0095]
The image data input to the intra-group specific macro / block processing circuit 20 is supplied to a Y / C separation circuit 21 and separated into luminance data Y and RY and BY color difference data C. The luminance data Y is supplied to the high-frequency signal removal circuit 22 and the terminal a of the changeover switch 24. The color difference data C is provided to the high-frequency signal removal circuit 23 and the terminal a of the changeover switch 25. The high-frequency signal removing circuits 22 and 23 are circuits for removing high-frequency components of the input luminance data and color difference data C. Luminance data Y and chrominance data C output from high-frequency signal removal circuits 22 and 23 are applied to terminals b of changeover switches 24 and 25, respectively. Therefore, the luminance data Y from which the high-frequency component has not been removed is supplied to the terminal a of the switch 24, and the luminance data Y from which the high-frequency component has been removed is supplied to the terminal b of the switch 24. The color difference data C from which the high-frequency component has not been removed is supplied to the terminal a of the changeover switch 25, and the color difference data from which the high-frequency component has been removed is supplied to the terminal b of the changeover switch 25.
[0096]
The changeover switches 24 and 25 are connected to the b terminal side when image data from which high frequency components are to be removed is input to the intra-group specific macro / block processing circuit 20 based on the phase signal supplied from the high frequency component removing macro / block phase calculating circuit 26. When the image data from which the high-frequency component is to be removed is input to the specific macro-block processing circuit 20 within the group, the luminance data Y and the chrominance data C from which the high-frequency component has been removed are switched in the high band signal removal circuits 22 and 23. Output data of the switches 24 and 25.
[0097]
The luminance data Y and the color difference data C that have passed through the changeover switches 24 and 25 are given to a Y / C synthesis circuit 27 and synthesized. The combined image data output from the Y / C combining circuit 27 becomes the output image data of the in-group specific macro / block processing circuit 20 and is supplied to the shuffling and deshuffling circuit 31 via the changeover switch 18.
[0098]
The phase signal and the same image identification data output from the high frequency removal macro / block phase calculation circuit 26 are applied to an error correction code addition and error correction circuit 34. In the error correction code addition and error correction circuit 34, a phase signal and the same image identification data are added to the image data. The image data to which the phase signal and the same image identification data are added is given to the magnetic tape 8, the image data is recorded in the video recording area of the magnetic tape 8, and the phase signal and the same image identification data are stored in the auxiliary area of the magnetic tape 8. Be recorded.
[0099]
The DVTR shown in FIG. 1 can reproduce in addition to recording image data.
[0100]
When the reproduction mode is set, the switch 41 is connected to the terminal b.
[0101]
The image data recorded in the video recording area of the magnetic tape 8 and the auxiliary area data recorded in the auxiliary area are read by the magnetic head 38. Data read by the magnetic head 38 is amplified by the recording / reproducing amplifying circuit 37 and supplied to the modulation / demodulation circuit 36. The data amplified by the recording / reproducing amplifying circuit 37 is also supplied to a waveform equalizing circuit 45. A control signal for waveform equalization is generated in the waveform equalization circuit 45 and supplied to the modulation / demodulation circuit 36. The modulation / demodulation circuit 36 performs demodulation processing of image data and waveform equalization processing.
[0102]
The image data output from the modulation / demodulation circuit 36 passes through an error correction code addition and error correction circuit 34, is applied to an image memory 35, and is temporarily stored. The image data stored in the image memory 35 is sequentially read, and error correction processing is performed in the error correction code addition and error correction circuit 34 based on the error correction code. The error-corrected image data is applied to a compression / expansion circuit 33 where the data is expanded, applied to an image memory 32 and temporarily stored.
[0103]
The image data is read out from the image memory 32 and given to the shuffling and deshuffling circuit 31, and the image data is returned to the original position on the screen. Output image data from the shuffling and deshuffling circuit 31 is supplied to a digital / analog conversion circuit 42 via a changeover switch 41 and is converted into an analog video signal. This analog video signal is provided to the monitor display device 43 and is displayed visually.
[0104]
Image data output from the shuffling and deshuffling circuit 31 is provided to the image memory 16. The auxiliary area recording data is extracted by the error correction code addition and error correction circuit 34 and supplied to the intra-group macro / block detection circuit 50. The intra-group macro / block detecting circuit 50 includes a still image recording mode detecting circuit 51 and a high frequency-containing macro / block detecting circuit 52.
[0105]
Whether the image data output from the shuffling and deshuffling circuit 31 is recorded in the still image recording mode based on the auxiliary area data input in the still image recording mode detection circuit 51 (for example, based on the same image identification data) Is detected. If the data is recorded in the moving image recording mode, the process of recording the image data output from the shuffling and deshuffling circuit 31 in the image memory 16 is not performed. If the image is recorded in the still image recording mode, the position on the screen of the macro block constituted by the image data in which the high frequency component remains in the high frequency containing macro block detection circuit 52 is determined based on the auxiliary area data. Is detected. The high-frequency-containing macro block detection signal output from the high-frequency-containing macro block detection circuit 52 is supplied to the memory controller 14. In the memory controller 14, only image data having a high frequency component is stored in the image memory 16 based on the detection signal output from the high frequency content macro block detection circuit 52. The image memory 16 stores only image data having a high-frequency component among the image data for five consecutive frames. Since the number of macroblocks of image data having a high-frequency component is one out of five, image data representing an image of one frame from image data of five frames is stored in the image memory 16. All the image data stored in the image memory 16 have high frequency components, and the image represented by this image data has high definition.
[0106]
The image data stored in the image memory 16 is provided to the printer device 55 via the printer interface 15, and a high-definition image is printed.
[0107]
FIGS. 15 to 21 show examples of an image (recorded / reproduced image) represented by image data recorded on the magnetic tape 8 and an image (composite image) obtained by compositing during reproduction in the DVTR shown in FIG. I have.
[0108]
FIG. 15 shows a recording / reproducing image represented by image data (a region represented by image data containing high-frequency components in a recording / reproducing image) when image data representing a still image of the same subject is recorded on the magnetic tape 8 over five frames. Is a solid line, and a portion of the region represented by the image data from which the high-frequency component has been removed is indicated by a chain line) and a composite image.
[0109]
In the example shown in FIG. 15, still images are continuously recorded in the moving image recording mode from the first frame to the 150th frame. From the 151st frame to the 155th frame, when the image is recorded in the still image recording mode and the image is divided into five in the horizontal direction, the leftmost region of the 151st frame has high definition (represented by high-frequency component image data). In the 152nd frame, the second region from the left has high definition, in the 153rd frame, the center region has high definition, in the 154th frame, the second region from the right has high definition, and the 155th frame has the highest definition. The high-frequency component removal processing of the image data is performed so that the right area has high definition. As shown in FIG. 15, in order to move the region of the high-definition image from the left to the right from the 151st frame to the 155th frame, it is necessary to remove the high frequency component of the image data representing the image of the 151st frame. In this case, the high-frequency component of the image data of the macroblock extracted from the superblock in the leftmost column of the image shown in FIG. 7 is left, and the high-frequency components of the image data of the other four macroblocks are removed. . Similarly, when removing the high-frequency component of the image data representing the images of the 152nd, 153rd, 154th and 155th frames, the second and third images from the left side of the image shown in FIG. The high-frequency components of the macroblock image data extracted from the superblocks of the fourth, fourth, and fifth columns are left, and the high-frequency components of the other four macroblock image data are removed. good.
[0110]
By recording the image data on the magnetic tape 8 in this manner, the first frame to the 150th frame or a still image is displayed on the display screen of the monitor display device 43 as shown in the upper part of FIG. From the 151st frame to the 155th frame, a still image, part of which is a high definition image, is displayed on the display screen of the monitor display device 43. Further, as described above, high-definition still images are printed from the printer device 55 by extracting image data having high-frequency components from image data recorded over five frames and generating a composite image.
[0111]
FIG. 16 shows a recorded / reproduced image and a composite image according to another example.
[0112]
The recording / reproducing image shown in FIG. 15 is divided into five parts in the horizontal direction and one of the five divided areas is a high-definition area, whereas the recording / reproducing image shown in FIG. One of the five divided areas is a high definition area. Synthesizing the image of the high-definition area to form one high-definition image is the same as that shown in FIG. In order to generate the recorded / reproduced image shown in FIG. 16, among the super blocks divided in the vertical direction in the group generation processing shown in FIG. 7, the 151st, 152nd, 153rd, 154th and 154th claims 155 When the high-frequency component removal processing of the image data representing the image of the claim is performed, the first and second rows, the third and fourth rows, the fifth and sixth rows, and the seventh row shown in FIG. High-frequency component removal processing may be performed on macroblocks extracted from the superblocks on the eighth and ninth and tenth rows. Even in this case, the recorded and reproduced image shown in the upper part of FIG. 16 is displayed on the display screen of the monitor display device 43 by the reproduction of the moving image, and the high-resolution composite image is printed from the printer device 55 by the reproduction of the still image.
[0113]
FIG. 17 shows a recorded / reproduced image and a composite image according to still another example.
[0114]
15 and FIG. 16 record a still image for generating a composite image over five frames, whereas the example shown in FIG. 17 records a still image for generating a composite image over two frames. ing.
[0115]
In the example shown in FIG. 17, when the high-frequency component removal processing of the image data representing the image of the 151st frame is performed, the image data of the macro block extracted from the three rows of superblocks on the left side of the image shown in FIG. The high-frequency component may be left, and the high-frequency component of the image data of other macro blocks may be removed. When the high-frequency component removal processing of the image data representing the image of the 152nd frame is performed, the high-frequency components are left for the macroblock image data extracted from the two columns of superblocks on the right side of the image shown in FIG. The high frequency component of the image data of the macro block may be removed.
[0116]
Also in the example shown in FIG. 17, a high-definition composite image can be obtained by synthesizing the high-definition region of the image of the 151st frame and the high-definition region of the image of the 152nd frame.
[0117]
FIG. 18 shows a recorded / reproduced image and a composite image according to still another example.
[0118]
The example shown in FIG. 15 records a still image for generating a composite image over five frames, whereas the example shown in FIG. 18 records a still image for generating a composite image over 28 frames. I have.
[0119]
In FIG. 18, when a macro block is extracted from a portion of an image indicated by a dashed line in FIG. 18 to form a group, high-frequency component removal processing may be performed on image data of the macro block. In this case, even when a macro block is extracted from the same super block, there will be a case where high frequency component image data is extracted and a case where it is not extracted.
[0120]
When a composite image is generated, an image that can form a single fine image by combining high-definition area portions from the 151st frame to the 178th frame is selected, and a high-definition image is synthesized. Become. Of course, in the high-definition image area, image data representing an image of an unnecessary part in image synthesis will be truncated.
[0121]
FIG. 19 shows a recorded / reproduced image and a composite image according to still another example.
[0122]
In the example shown in FIG. 19, the images from the 151st frame to the 181st frame have less color difference data as the frame number increases, and the image of the 181st frame is a monochrome image represented only by the luminance data. In the example shown in FIG. 19, as the frame number increases from the 151st frame, the number of DCT blocks for removing the high frequency components of the RY and BY color difference data may be gradually increased. In this case, high-frequency component removal processing will be performed on color difference data even for DCT blocks that constitute the same macro block, but high-frequency component removal processing will not be performed on luminance data. However, high-frequency components are not removed from the color difference data of the DCT block that forms the macro block that is formed by the DCT block from which the color difference data has been removed, and the macro block that is formed by the DCT block from which the color difference data has not been removed is configured. High frequency components may be removed from the luminance data of the DCT block. As a result, a high-definition color image can be restored from the color difference data from which the high-frequency components have not been removed and the luminance data from the color difference data from which a plurality of components have not been removed and the image data representing the frame image.
[0123]
FIG. 20 shows a recorded / reproduced image and a composite image according to still another example.
[0124]
In the example shown in FIG. 20, the recorded / reproduced image is divided into a large number of regions both in the vertical and horizontal directions, and the high-frequency components of the color difference data are removed from the divided regions indicated by chain lines. Also in the example shown in FIG. 20, color difference data and luminance data from which high-frequency components have not been removed can be extracted, and one high-definition color image can be restored.
[0125]
FIGS. 21 and 22 show still another embodiment. FIG. 21 shows a recording / reproducing image and a composite image when a subject is photographed using a CCD of about 1.4 million pixels of 1440 pixels in the horizontal direction and 960 pixels in the vertical direction. An example is shown in FIG. 22, and an image of about 1.4 million pixels of 1440 pixels in the horizontal direction and 960 pixels in the vertical direction is divided into an image of about 350,000 pixels of 720 pixels in the horizontal direction and 480 pixels in the vertical direction having a data amount of 1/4. Shows how to do it.
[0126]
According to the recording standard of the DVTR, image data of about 350,000 pixels of 720 pixels in the horizontal direction and 480 pixels in the vertical direction is determined to be recorded in the video recording area of the magnetic tape 8 as data of one frame image. Image data of about 1.4 million pixels of 960 pixels in the pixel vertical direction cannot be recorded in the video recording area of the magnetic tape 8 as data of one frame image. For this reason, when an object is photographed using a CCD having about 1,400,000 pixels, ie, 1440 pixels in the horizontal direction and 960 pixels in the vertical direction, as shown in FIG. Image data having 720 pixels in the direction and 480 pixels in the vertical direction and having about 350,000 pixels is divided into four.
[0127]
Referring to FIG. 22, this four-divided image is a first divided image formed by extracting pixels in odd-numbered rows and odd-numbered columns as represented by circles, triangles, crosses, and squares, and an even-numbered image. A second divided image formed by extracting pixels in odd-numbered rows, a third divided image formed by extracting pixels in even-numbered rows, and pixels of odd-numbered columns are extracted. It is configured to be the fourth divided image that is configured. By recording these four divided images over four frames, recording can be performed in accordance with the DVTR standard.
[0128]
Referring to FIG. 21, when four divided images are obtained, the same two images are generated from each divided image as in the example shown in FIG. 20, and these two images are further divided into a large number of regions. The high-frequency component of the color difference data is removed from the area indicated by the chain line and recorded on the magnetic tape 8. In the example shown in FIG. 21, the divided image is recorded on the magnetic tape 8 over eight frames.
[0129]
At the time of reproduction, the image data in which the high-frequency component of the image divided into two is left is extracted, the four divided images are restored from the extracted image data, and the four divided images are further combined to obtain 1440 pixels in the horizontal direction. A high-definition image of 960 pixels in the vertical direction is restored.
[0130]
In the example shown in FIGS. 20 and 21, identification data indicating that the four divided images are divided from one high-definition image is recorded in the auxiliary area of the magnetic tape 8 as auxiliary area data. A high-definition image is restored from the 4-divided image based on the data.
[0131]
In the above-described embodiment, the image data from which the high-frequency component is removed is detected before being applied to the shuffling and deshuffling circuit 31, and the image data including a part of the image data from which the high-frequency component has been removed in advance is shuffled and deshuffled. However, the shuffling and deshuffling circuit 31 may perform high frequency component removal processing on image data that is shuffled and output. In that case, a high-frequency signal removal circuit is connected to the subsequent stage of the shuffling and deshuffling circuit 31, and when the image data for removing the high-frequency component is output, the image data to be given to the high-frequency signal removal circuit and to leave the high-frequency component is When output, a switch circuit that avoids the high-frequency signal removal circuit is provided, and data compression processing will be performed thereon.
[0132]
Further, in the above embodiment, the compressed image data of 5 frames is recorded in the recording area of 5 frames of the magnetic tape 8, but it may be recorded in the recording area of 5 frames or more.
[Brief description of the drawings]
FIG. 1 is a block diagram showing an electrical configuration of a digital video tape recorder.
FIG. 2 is a block diagram showing an electrical configuration of a specific macro / block processing circuit within a group;
FIG. 3 is a flowchart illustrating a shuffling processing procedure.
4A shows a screen represented by one frame of luminance data, and FIG. 4B shows a screen represented by one frame of color difference data.
FIG. 5 shows a block generation process at the right end of the screen.
FIGS. 6A and 6B show macro blocks.
FIG. 7 shows a process of extracting a macro block from a super block and generating a group.
FIGS. 8A, 8B and 8C show an example of a super block.
FIG. 9 shows an example of a group.
FIG. 10 is a part of a flowchart showing a process of extracting a macro block from a super block and generating a group, and a process of storing overflow data generated during data compression.
FIG. 11 is a part of a flowchart showing a process of extracting a macro block from a super block and generating a group, and a process of storing overflow data generated during data compression.
FIG. 12 is a part of a flowchart showing a process of extracting a macro block from a superblock and generating a group, and a process of storing overflow data generated during data compression.
FIGS. 13A to 13E show processing for generating a group of macro blocks at the same position from image data representing the same subject image.
14A shows a format of a magnetic tape, and FIG. 14B shows a track format.
FIG. 15 shows a recorded / reproduced image represented by image data recorded on a magnetic tape, and a composite image composed of a high-definition portion of the recorded / reproduced image.
FIG. 16 shows a recorded / reproduced image represented by image data recorded on a magnetic tape and a composite image composed of a high-definition portion of the recorded / reproduced image.
FIG. 17 shows a recorded / reproduced image represented by image data recorded on a magnetic tape, and a composite image composed of a high-definition portion of the recorded / reproduced image.
FIG. 18 shows a recorded / reproduced image represented by image data recorded on a magnetic tape, and a composite image composed of a high-definition portion of the recorded / reproduced image.
FIG. 19 shows a recorded / reproduced image represented by image data recorded on a magnetic tape, and a composite image composed of a high-definition portion of the recorded / reproduced image.
FIG. 20 shows a recorded / reproduced image represented by image data recorded on a magnetic tape, and a composite image composed of a high-definition portion of the recorded / reproduced image.
FIG. 21 shows a recorded / reproduced image represented by image data recorded by a CCD having a large number of pixels and recorded on a magnetic tape, and a composite image composed of a high-definition portion of the recorded / reproduced image.
FIG. 22 illustrates a state where an image having a large number of pixels is divided into four images.
[Explanation of symbols]
12 DSP
14 Memory controller
16, 32, 35 Image memory
20 Specific macro / block processing circuit in group
22,23 High frequency signal removal circuit
24, 25 selector switch
26 High frequency rejection macro block phase detection circuit
50 Macro block detection circuit in group
51 Still image recording mode detection circuit
52 High Frequency Containing Macro Block Detection Circuit

Claims (14)

Dividing the original still image represented by the original still image data into a plurality of areas larger than n;
From the original still image divided into a plurality of areas, n areas are extracted, and one group image data is formed by the image data of the n areas.
Removing high-frequency components of image data of other areas excluding at least one of the n areas belonging to the group;
The group image data including the image data of the area from which the high-frequency component has been removed is subjected to data compression so as to have a predetermined data amount,
For all areas of the original still image, the group image data forming process, the high frequency component removing process, and the data compression process are repeated while changing the area to be extracted.
The obtained compressed image data for one image is recorded in a recording area of one or more images on a recording medium, and
For each of the representing an original still image and the same image (n-1) pieces of quiescent image, the same combination of the area forming the group, and by changing the area of removing high frequency components, the area division processing , The group image data forming process, the high frequency component removing process, the data compression process, and the iterative control process, thereby obtaining (n-1) images of compressed image data. A digital image data recording method for recording compressed image data of a recording medium in a recording area of (n-1) images or more on a recording medium. Image dividing means for dividing an original image represented by given image data into a plurality of areas larger than n, extracting n areas from the plurality of areas of the original image, and using the image data of the n areas Group image data forming means for forming one group image data, data compressing means for compressing the group image data so as to have a predetermined data amount, and areas for extracting all areas of the original image. The repetition control means for repeatedly performing the group image data formation processing in the group image data formation means and the data compression processing in the data compression means while changing the compressed image data for one image obtained by the repetition control means. Recording control means for recording in a recording area of one image or more In the recording apparatus in a digital image data,
When n frames of still image data representing the same still image are provided, and n pieces of the group image data are composed of image data of an area located at the same position from each of the n frames of still images, a still image of a different frame is obtained. In the group image data obtained from the image, the high-frequency component-containing area for retaining the high-frequency component and the high-frequency component removal area for removing the high-frequency component among the n areas belonging to the group have different combinations on the still image. Calculate the position of each area,
By the area position calculation processing, the high frequency components of the still image data for n frames corresponding to the high frequency component removal areas corresponding to the positions calculated on the still images for n frames are removed,
The image data for n frames partially including the image data from which the high-frequency component has been removed is provided to the image dividing means for the image division, and the image dividing processing and the data compression processing in the data compressing means are performed to obtain the image data. The image dividing means, the data compression means, the repetition control means and the recording control means are controlled so that the compressed image data for n frames is recorded in the compressed image data recording area for n frames or more by the recording control means. Do,
Digital image data recording method. Reading compressed image data for n frames recorded on the recording medium, expanding the read compressed image data,
Image data representing an image of an area where a high-frequency component is left is extracted from image data of n frames that have been data expanded by the image data expansion process,
Constructing and outputting image data representing the still image from the image data obtained by the high-frequency component image data extraction processing;
The digital image data recording method according to claim 1. The high frequency component removal processing
By collecting the areas where the high-frequency components are left, a partial image area is formed when the image is divided into n pieces, and this partial image area forms a different image area in a different frame. The processing for removing the image data of the high frequency component is performed.
The digital image data recording method according to claim 1. The high frequency component removal processing
In a different one of the n groups composed of n images, high-frequency component color data is removed from the group image data so that high-frequency component image data is left in different areas. ,
The digital image data recording method according to claim 1. It represents the same still image and is provided with fine image data having a data amount m times the data amount of the unit image data,
Performing a unit image data division process of dividing the fine image data into m unit image data so that each represents one frame of image;
The above area division processing
The divided image represented by the unit image data divided by the image data dividing process is divided into a plurality of areas.
The above recording control processing
Compressed image data of m × n unit image data output from the data compression means is recorded in m × n or more unit image data recording areas of the recording medium.
The digital image data recording method according to claim 1. The original still image represented by the original still image data is divided into a plurality of areas larger than n, and n areas are extracted from the original still image divided into the plurality of areas, and the images of the n areas are extracted. One group image data is formed by the data, and the high frequency components of the image data of the other areas excluding at least one of the n areas belonging to the group are removed, and the high frequency component of the area from which the high frequency components have been removed is removed. The group image data including image data is compressed so as to have a predetermined data amount. For all areas of the original still image, the group image data forming process and the high frequency An iterative control process for repeating the component removal process and the data compression process is performed. Compressed image data is recorded in the recording area of more than one image of the recording medium, for each of the original still image and representing the same image (n-1) number of quiescent image, the combination of the area forming the group By performing the area division processing, the group image data formation processing, the high frequency component removal processing, the data compression processing, and the iterative control processing while maintaining the same and changing the area from which the high frequency component is removed, (n−1) ) The compressed image data for the image is obtained, and the compressed image data for these (n-1) images are recorded in the recording area of the recording medium in the recording area equal to or more than the (n-1) image. Read compressed image data of
Expands the read compressed image data,
Image data representing an image of an area where a high-frequency component is left is extracted from image data of n frames that have been data expanded by the image data expansion process,
Constructing and outputting image data representing the still image from the image data obtained by the high-frequency component image data extraction processing;
Digital image data reproduction method. Image dividing means for dividing the original still image represented by the original still image data into a plurality of areas larger than n;
A group image data forming unit that extracts n areas from the original still image divided into a plurality of areas and forms one group image data by the image data of the n areas;
High-frequency component removing means for removing high-frequency components of image data in areas other than at least one of the n areas belonging to the group;
Data compression means for compressing the group image data including the image data of the area from which the high-frequency component has been removed by the high-frequency component removal means so as to have a predetermined data amount;
Repetition control means for performing repetition control processing for repeating the group image data formation processing, the high frequency component removal processing, and the data compression processing while changing the extraction area for all areas of the original still image;
A first recording control means as well as the original still image and the same image, to be recorded in one image than in the recording area for one image recording medium the compressed image data obtained by the source of control of the repetition control means representing for each of the (n-1) number of quiescent image, the same combination of the area forming the group, and by changing the area of removing high frequency components, the area division processing, the group image data forming processing, By performing the high-frequency component removal processing, the data compression processing, and the iterative control processing, compressed image data for (n-1) images is obtained, and the compressed image data for these (n-1) images is stored in a recording medium. Second recording control means for recording in a recording area equal to or more than (n-1) images,
A digital image data recording device comprising: Image dividing means for dividing an original image represented by given image data into a plurality of areas larger than n, extracting n areas from the plurality of areas of the original image, and using the image data of the n areas Group image data forming means for forming one group image data, data compressing means for compressing the group image data so as to have a predetermined data amount, and areas for extracting all areas of the original image. The repetition control means for repeatedly performing the group image data formation processing in the group image data formation means and the data compression processing in the data compression means while changing the compressed image data for one image obtained by the repetition control means. Recording control means for recording in a recording area of one image or more In a digital image data recording apparatus, n frames of still image data representing the same still image are given, and the group image data is divided into n pieces by the image data of the area located at the same position from each of the n frames of still images. When configured, in group image data obtained from still images of different frames, a combination of a high-frequency component-containing area that leaves high-frequency components out of n areas belonging to the group and a high-frequency component removal area that removes high-frequency components is used. Area position calculating means for respectively calculating the position of the area on the still image so as to be different;
High-frequency component removing means for removing the high-frequency components of the still image data for n frames corresponding to the high-frequency component removing areas at the positions calculated on the n frames of still images by the area position calculating means,
The image data for n frames partially including the image data from which the high-frequency component has been removed by the high-frequency component removing means is provided to the image dividing means for the image division, and the image dividing processing and the data compression processing in the data compressing means are performed. And the above-mentioned image dividing means, the above-mentioned data compression means, the above-mentioned repetition control means and the above-mentioned means so that the obtained compressed image data of n frames is recorded in the compressed image data recording area of n frames or more by the above-mentioned recording control means. Means for controlling the recording control means,
A digital image data recording device comprising: Reading means for reading compressed image data for n frames recorded on the recording medium;
Image data decompression means for decompressing the compressed image data read by the reading means,
High-frequency component image data extracting means for extracting image data representing an image of an area where a high-frequency component remains from n frames of image data expanded by the image data expanding means; and high-frequency component image data extracting means. Image forming means for forming and outputting image data representing the still image from the output image data;
10. The digital image data recording device according to claim 8, further comprising: The high frequency component removing means is
By collecting the areas where the high-frequency components are left, a partial image area is formed when the image is divided into n pieces, and this partial image area forms a different image area in a different frame. The processing for removing the image data of the high frequency component is performed.
The digital image data recording device according to claim 8. The high frequency component removing means is
In a different one of the n groups composed of n images, high-frequency component color data is removed from the group image data so that high-frequency component image data is left in different areas. ,
The digital image data recording device according to claim 8. It represents the same still image and is provided with fine image data having a data amount m times the data amount of the unit image data,
A unit image data dividing means for dividing the fine image data into m unit image data so that each unit image represents one frame image;
The image dividing means is
The divided image represented by the unit image data divided by the unit image data dividing means is divided into a plurality of areas;
Recording compressed image data of m × n unit image data output from the data compression unit in m × n or more unit image data recording areas of the recording medium;
The digital image data recording device according to claim 8. The original still image represented by the original still image data is divided into a plurality of areas larger than n, and n areas are extracted from the original still image divided into the plurality of areas, and the images of the n areas are extracted. One group image data is formed by the data, and the high frequency components of the image data of the other areas excluding at least one of the n areas belonging to the group are removed, and the high frequency component of the area from which the high frequency components have been removed is removed. The group image data including image data is compressed so as to have a predetermined data amount. For all areas of the original still image, the group image data forming process and the high frequency An iterative control process for repeating the component removal process and the data compression process is performed. Compressed image data is recorded in the recording area of more than one image of the recording medium, for each of the original still image and representing the same image (n-1) number of quiescent image, the combination of the area forming the group By performing the area division processing, the group image data formation processing, the high frequency component removal processing, the data compression processing, and the iterative control processing while maintaining the same and changing the area from which the high frequency component is removed, (n−1) ) The compressed image data for the image is obtained, and the compressed image data for these (n-1) images are recorded in the recording area of the recording medium in the recording area equal to or more than the (n-1) image. Reading means for reading compressed image data of
Data decompression means for decompressing the compressed image data read by the reading means,
Image data extracting means for extracting image data representing an image of an area in which a high-frequency component remains from image data for n frames which has been data-expanded by the image data expanding means, and output from the high-frequency component image data extracting means. Image composing means for composing and outputting image data representing the still image from the image data obtained,
A digital image data reproducing apparatus comprising:

Images