JPH09307902A - Compression recorder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To generate a reproduced image with excellent quality without folding distortion or ringing by allowing each of a plurality of pixel blocks subjected to orthogonal transformation to include a plurality of transformation coefficients. SOLUTION: A compressed image generating section 100 uses a filter to apply band limitation to an input image signal so as to generate a compressed image as a result of thinning to 1/2 longitudinally and 1/2 laterally and the compressed image is given to an orthogonal transformation section 101. The transformation section 101 processes the compressed image into a block of 4×4 pixels and applies the DC transformation to the image in the unit of blocks and provides an output of a DCT coefficient to a zero coefficient addition section 102. The addition section 102 adds 48-sets of 0 coefficients to a block consisting of 16-sets of DCT coefficients to re-configure the block into a DCT block consisting of 64-sets of DCT coefficients. A compression section 103 applies quantization and variable length coding to the DCT block to generate compression data and provides an output of the result. DCT is applied to the 4×4 pixels in this way to obtain a reproduced image with excellent quality with a smaller circuit scale than that of the case with 8×8 pixels.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compression recording device used for recording or transmitting a video signal by high efficiency coding.

[0002]

2. Description of the Related Art Currently, as a standard compression method for TV signals,
There is an MPEG system (MPEG1 or MPEG2).
These are techniques for significantly compressing the amount of information using orthogonal transformation and variable length coding.

FIG. 6 is a block diagram of a first conventional example. 50
Reference numeral 0 is an orthogonal transform calculation unit, and 501 is a data compression unit. The input signal is an original image in the case of I frame, and a difference signal between frames in the case of P and B frames. As shown in FIG. 7, the orthogonal transform calculation unit 500 divides the input signal into blocks of 8 × 8 pixels, performs orthogonal transform calculation in block units, and generates transform coefficients. The data compression unit 501 quantizes and transforms the transform coefficient to generate compressed data. Although DCT (discrete cosine transform) is used as the orthogonal transform, when performing the DCT operation of 8 × 8 pixels, the circuit scale of the operation unit is very large, and more operation time is required. Therefore, downsizing of the circuit,
There has been a demand for simplification and further reduction of calculation time.

Particularly in special reproduction images or images for retrieval, it is important to reduce the circuit scale, simplify the circuit, and shorten the calculation time, rather than the high resolution. In fact, in MPEG, D
The special reproduction image is generated from the low-frequency image composed of the C component and a few AC components.

FIG. 8 is a block diagram of the second conventional example. 60
Reference numeral 0 is a data compression unit, 601 is a high frequency coefficient removal unit, 602 is a format unit, and 603 is a recording unit.

The data compression section 600 converts the input signal into 8
It is divided into blocks of × 8 pixels, and orthogonal transformation, quantization, and variable length coding are performed in block units to generate compressed data. The compressed data is input to the high frequency removing unit 601 and the formatting unit 602. As shown in FIG. 9, the high frequency coefficient removing unit 601 removes the high frequency component of the compressed data to generate low frequency data. Conventionally, low frequency data is often composed of a DC coefficient and about 2-3 AC components. The low frequency data is input to the format unit 602 together with the compressed data. The format unit 602 arranges the compressed data in the normal reproduction image recording area and the low frequency data in the special reproduction image recording area to generate the recording data. The recording data is input to the recording unit 603. The recording unit 603 records the recording data on the recording medium.

There is also a method of generating special reproduction data from a reduced image generated from an input image (Japanese Patent Application No. 7-2667).
31).

FIG. 10 is a block diagram of Conventional Example 3. 7
00 is a first data compression unit, 701 is a reduced image generation unit, FIG. 702 is a second data compression unit, FIG. 703 is a format unit, and FIG. 704 is a recording unit.

The first data compression section 700 blocks the input signal into blocks of 8 × 8 pixels, performs orthogonal transformation, quantization, and variable length coding in block units to generate first compressed data. The reduced image generation unit 701 performs filter processing on the input signal to limit the band, and then thins out vertically to 1/2 and horizontally to generate a reduced image. The reduced image is input to the second data compression unit 702. The second data compression unit 702 divides the input reduced image into blocks of 8 × 8 pixels, performs orthogonal transform, quantization, and variable length coding in block units to generate second compressed data. The first compressed data and the second compressed data are input to the format unit 703. The format unit 703 arranges the first compressed data in the first compressed data recording area and the second compressed data in the second compressed data recording area to generate recording data. The recording data is input to the recording unit 704. The recording unit 704 records the recording data on the recording medium.

[0010]

However, in the conventional example 1, both the circuit scale and the calculation time are large.

Further, in the conventional example 2, in order to remove the high frequency component without limiting the band with respect to the input image, aliasing distortion or ringing occurs in the special reproduction image composed of the low frequency data, and visually. It was very deteriorated.

Further, in Conventional Example 3, in addition to the orthogonal transformation calculation unit for generating compressed data for normal reproduction image and the data compression unit, the orthogonal transformation calculation unit for generating compression data for special reproduction image and the data. There is a drawback that a compression unit is required and the circuit scale is extremely increased.

The present invention has been made in order to solve the above problems, and provides an excellent normal reproduction image, special reproduction image, and search image while suppressing an increase in circuit scale.

[0014]

SUMMARY OF THE INVENTION The present invention for solving the above-mentioned problems is based on a plurality of pixel values forming one screen image, and generates a reduced image by reducing the screen image. Means, an orthogonal transformation calculation means for performing an orthogonal transformation on each of the plurality of first pixel blocks included in the reduced image, and a plurality of 0 coefficients for each of the plurality of first pixel blocks subjected to the orthogonal transformation. Is added to generate a second pixel block, and a reduced image for generating compression coded data for the reduced image based on each of the second pixel blocks generated by the 0 coefficient adding unit. A compression recording device, comprising: a compression encoding unit, wherein each of the plurality of first pixel blocks subjected to the orthogonal transformation includes a plurality of transformation coefficients.

It should be noted that the compression recording apparatus, based on a plurality of pixel values forming the one-screen image, generates frame-compressed data for the one-screen image, and a frame compression coding unit. Formatting means for generating recording data based on the compression encoded data generated by the encoding means and the reduced image compression encoding means, and recording means for recording the recording data in a storage medium for storing the data. Further, the compression coded data generated by the frame compression coding means is recorded in a first compressed data recording area of the storage medium, and the compression coded data generated by the reduced image compression coding means is
The data may be recorded in the second compressed data recording area of the storage medium (the second configuration is adopted for the purpose of explanation of an example of the operation).

Further, the reduced image compression coding means performs quantization and variable length coding processing on each of the second pixel blocks generated by the 0 coefficient adding means, and compresses the reduced image. The converted data may be generated (the first configuration is used for the purpose of explanation of the example of the operation, etc., that is, the configuration of claim 3 which is dependent on claim 1 is the first configuration).

Further, the reduced image compression coding means uses each of the second pixel blocks generated by the 0 coefficient adding means as an orthogonal transform block, and generates a macroblock using a plurality of the orthogonal transform blocks. Slice generating means for generating a slice using a plurality of the macroblocks, importance determining means for determining the visual importance of each macroblock, and macros for each macroblock included in each slice. Compression coding means for performing compression and variable-length coding processing to generate compression coded data for the reduced image so that the code quantity falls within the range of code quantity according to the visual importance of the block. , The code amount according to the visual importance of each macroblock included in the slice is determined so that the data amount of the slice falls within a predetermined range. It may be as is (a third configuration for description of such examples of action).

Further, the reduced image compression coding means sets each of the second pixel blocks generated by the 0 coefficient adding means as an orthogonal transformation block, and generates a macroblock by using a plurality of the orthogonal transformation blocks. Slice generating means for generating a slice using a plurality of the macroblocks, each transform coefficient included in each orthogonal transform block, a classifying means for classifying whether or not it is important, and the slice for each slice. Of the transform coefficients of the orthogonal transform blocks included in the slice so that the data amount of the data is within a predetermined range, at least the transform coefficients classified as important by the classifying unit are quantized and variable-length coded. A compression encoding unit that performs a process to generate compression encoded data for the reduced image may be provided (for example, an explanation of an example of an operation will be given). A fourth configuration).

Further, the frame compression coding means performs orthogonal transformation, quantization and variable length coding processing on a plurality of third pixel blocks included in the one screen, and is included in the third pixel block. The number of transform coefficients may be equal to the number of transform coefficients included in the second pixel block.

Next, an example of the operation of the present invention will be described.

In the first configuration of the present invention, the input image is band-limited by a filter and vertically thinned to 1 / M (M is a natural number of 2 or more) and 1 / N (N is a natural number of 2 or more) horizontally. The reduced image thus generated is used as the input image for the special reproduction image, and the first pixel block composed of (K × L) pixels (K and L are natural numbers of 2 or more) of the reduced image is subjected to orthogonal transformation to obtain (K × L). A second pixel block composed of (K × L + T) transform coefficients by generating (L) transform coefficients, adding T (T is a natural number) 0 coefficient to (K × L) transform coefficients Is quantized and variable-length coded to generate compressed data.

As a result, a good quality reproduced image can be generated with a small circuit scale.

The second configuration of the present invention has two compression coding means for generating the first compressed data and the second compressed data, and performs high efficiency coding on the input image to generate the first compressed data. Then, the input image is band-limited by a filter and vertically 1 /
A reduced image generated by thinning M (M is a natural number of 2 or more) horizontally to 1 / N (N is a natural number of 2 or more) is used as an input image for a special reproduction image, and (K × L) pixels ( K and L are 2
Orthogonal transform is performed on the block consisting of the above natural number),
(K × L) transform coefficients are generated, and T (T is a natural number) 0 coefficient is added to the (K × L) transform coefficients (K × L).
The second pixel block composed of + T) transform coefficients is quantized and variable-length coded to generate second compressed data,
The compressed data and the second compressed data are recorded in a specific recording area.

As a result, it is possible to generate a special reproduced image of a very high quality visually with no circuit distortion and no ringing with a small circuit scale. Further, by enabling the decoder that can decode the first compressed data to decode the second compressed data, an additional circuit for decoding the second compressed data is not needed, and an increase in circuit scale can be suppressed.

The third structure of the present invention has two compression coding means for generating the first compressed data and the second compressed data, and performs high efficiency coding on the input image to generate the first compressed data. Then, the input image is band-limited by a filter and vertically 1 /
A reduced image generated by thinning M (M is a natural number of 2 or more) horizontally to 1 / N (N is a natural number of 2 or more) is used as an input image for a special reproduction image, and (K × L) pixels ( K and L are 2
The first pixel block composed of the above natural numbers is subjected to orthogonal transformation to generate (K × L) transform coefficients, and T (T is a natural number) 0 coefficients are added to (K × L) transform coefficients. Did (K
The second pixel block consisting of (× L + T) transform coefficients is R
(R is a natural number) are collected into a macroblock, and S macroblocks (S is a natural number) are collected to generate a slice.
Gives a larger code amount to macro blocks with high visual importance and a smaller code amount to macro blocks with low visual importance, and does not exceed a specific code amount defined in slice units. Thus, the second compressed data is generated by performing the quantization and the variable length coding, and the first compressed data and the second compressed data are recorded in a specific recording area.

As a result, it is possible to generate a specially reproduced image of very good visual quality with a small circuit scale and without aliasing distortion or ringing. Further, by enabling the decoder that can decode the first compressed data to decode the second compressed data, an additional circuit for decoding the second compressed data is not needed, and an increase in circuit scale can be suppressed.

According to the fourth aspect of the present invention, it has two compression coding means for generating the first compressed data and the second compressed data, and performs high efficiency coding on the input image to generate the first compressed data. Then, the input image is band-limited by a filter and vertically 1 /
A reduced image generated by thinning M (M is a natural number of 2 or more) horizontally to 1 / N (N is a natural number of 2 or more) is used as an input image for a special reproduction image, and (K × L) pixels ( K and L are 2
The first pixel block composed of the above natural numbers is subjected to orthogonal transformation to generate (K × L) transform coefficients, and T (T is a natural number) 0 coefficients are added to (K × L) transform coefficients. Did (K
The second pixel block consisting of (× L + T) transform coefficients is R
(R is a natural number) are collected into a macroblock, and S macroblocks (S is a natural number) are collected to generate a slice.
(K × L + T) transform coefficients are classified into important data and non-important data, and the second compressed data is generated by performing quantization and variable length coding so that at least only important data is recorded in slice units. , The first compressed data and the second compressed data are recorded in a specific recording area.

As a result, it is possible to generate a visually reproduced special reproduction image with a small circuit scale and without aliasing distortion or ringing. Further, by enabling the decoder that can decode the first compressed data to decode the second compressed data, an additional circuit for decoding the second compressed data is not needed, and an increase in circuit scale can be suppressed.

[0029]

Embodiments of the present invention will be described below with reference to the drawings.

(First Embodiment) The first embodiment of the present invention will be described below.
Embodiments will be described with reference to FIGS. In FIG. 1, 100 is a reduced image generation unit, 101 is an orthogonal transformation calculation unit, 102 is a 0 coefficient addition unit, and 103 is a data compression unit.

Next, the operation of this embodiment will be described. The input image signal is input to the reduced image generation unit 100. The reduced image generation unit 100 band-limits the input image with a filter and generates a reduced image by thinning out vertically by 1/2 and horizontally by 1/2. The orthogonal transform calculation unit 101 divides the reduced image into blocks of 4 × 4 pixels, performs DCT transform in block units, and outputs DCT coefficients. As shown in FIG. 2, the 0 coefficient adding unit 102 receives the 16 input DC signals.
48 0 coefficients are added to a block consisting of T coefficients to obtain 6
Reconstruct a DCT block consisting of 4 DCT coefficients. The data compression unit 103 quantizes the DCT block and performs variable length coding to generate compressed data.

By performing the DCT of 4 × 4 pixels in this way, it is possible to generate a reproduced image with a smaller circuit scale than in the case of performing the DCT of 8 × 8 pixels.

The reduced image generating section 100 corresponds to the reduced image generating means according to claim 3 which is dependent on claim 1 of the present invention. The orthogonal transform calculation unit 101 corresponds to the orthogonal transform calculation means of the present invention. The 0 coefficient adding unit 102 corresponds to the 0 coefficient adding means of the present invention. The data compression unit 103 corresponds to the reduced image compression coding means of the present invention.

(Second Embodiment) The second embodiment of the present invention will be described below.
The embodiment will be described with reference to FIG. In FIG. 3, 200 is a first data compression unit, 201 is a reduced image generation unit, 202 is an orthogonal transformation calculation unit, 203 is a 0 coefficient addition unit, 204 is a second data compression unit, 205 is a formatting unit, and 206 is a recording unit. Is.

Next, the operation of this embodiment will be described. The input image signal is transmitted to the first data compression unit 200,
It is input to the reduced image generation unit 201. The first data compression unit 200 blocks the input signal into blocks of 8 × 8 pixels, performs DCT conversion, quantization, and variable length coding in block units, and generates first compressed data.

The reduced image generating unit 201 band-limits the input image with a filter and generates a reduced image by thinning out vertically by 1/2 and horizontally by 1/2. The orthogonal transform calculation unit 202 divides the reduced image into blocks of 4 × 4 pixels, performs DCT conversion in block units, and outputs DCT coefficients. As shown in FIG. 2, the 0 coefficient adding unit 203 adds 48 0 coefficients to the input block of 16 DCT coefficients to reconstruct a DCT block of 64 DCT coefficients. The second data compression unit 204 is a data compression unit DCT.
The block is quantized and variable-length coded to generate second compressed data. The first compressed data and the second compressed data are input to the format unit 205.

The format unit 205 arranges the first compressed data in the first compressed data recording area and the second compressed data in the second compressed data recording area to generate recording data. The recording data is input to the recording unit 206. The recording unit 206 records the recording data on the recording medium.

As a result, it is possible to generate a special reproduction image of very good visual quality without aliasing or ringing. Further, it is possible to suppress an increase in circuit scale by performing orthogonal transformation of 4 × 4 pixels. Further, by enabling the decoder that can decode the first compressed data to decode the second compressed data, an additional circuit for decoding the second compressed data is unnecessary, and an increase in circuit scale is suppressed. You can

The reduced image generating section 201 corresponds to the reduced image generating means according to claim 3 which is dependent on claim 2 of the present invention. The orthogonal transformation calculation unit 202 corresponds to the orthogonal transformation calculation means of the present invention. The 0 coefficient adding unit 203 corresponds to the 0 coefficient adding means of the present invention. Second data compression unit 204
Corresponds to the reduced image compression encoding means of the present invention. First
The data compression section 200 corresponds to the frame compression encoding means of the present invention. The formatting unit 205 corresponds to the formatting means of the present invention. The recording unit 206 corresponds to the recording means of the present invention.

(Third Embodiment) Hereinafter, a third embodiment of the present invention will be described.
The embodiment will be described with reference to FIG. In FIG. 4, 300 is a first data compression unit, 301 is a reduced image generation unit, 302 is an orthogonal transformation calculation unit, 303 is a 0 coefficient addition unit, 304 is a slice generation unit, 305 is an importance degree detection unit, and 306 is a second degree. A data compression unit, 307 is a format unit, and 308 is a recording unit.

Next, the operation of this embodiment will be described. The input image signal is transmitted to the first data compression unit 300,
It is input to the reduced image generation unit 301. The first data compression unit 300 blocks the input signal into blocks of 8 × 8 pixels, performs DCT conversion, quantization, and variable length coding in block units, and generates first compressed data.

The reduced image generating unit 301 band-limits the input image with a filter to generate a reduced image by thinning out vertically by 1/2 and horizontally by 1/2. The orthogonal transform calculation unit 302 divides the reduced image into blocks of 4 × 4 pixels, performs DCT transform in block units, and outputs DCT coefficients. As shown in FIG. 2, the 0 coefficient adding unit 303 adds 48 0 coefficients to the input block of 16 DCT coefficients to reconstruct a DCT block of 64 DCT coefficients. The slice generation unit 304 forms a macroblock by combining two adjacent luminance signal blocks and a total of four luminance signal blocks and two color difference blocks at the same position on the screen. Further, three macro blocks are combined to form a slice block. The importance degree detection unit 305 detects the visual importance degree of a macroblock in slice units and determines the priority of macroblocks in the same slice. That is, macroblocks determined to have high visual importance have higher priority within a slice and are assigned a larger code amount. On the contrary, the macroblock determined to have a low visual importance has a lower priority within the slice and is assigned a smaller code amount. The second data compression unit 306 calculates the code amount to be assigned to each macroblock from the priority within the slice so as not to exceed the fixed data amount for each slice, and performs the quantization and the variable length code based on the code amount. Then, the second compressed data is generated. The first compressed data and the second compressed data are input to the format unit 307.

The format unit 307 arranges the first compressed data in the first compressed data recording area and the second compressed data in the second compressed data recording area to generate recording data. The recording data is input to the recording unit 308. The recording unit 308 records the recording data on the recording medium.

As a result, it is possible to generate a special reproduction image of very good visual quality without aliasing distortion or ringing. Further, it is possible to suppress an increase in circuit scale by performing orthogonal transformation of 4 × 4 pixels. Further, by enabling the decoder that can decode the first compressed data to decode the second compressed data, an additional circuit for decoding the second compressed data is unnecessary, and an increase in circuit scale is suppressed. You can

The reduced image generating section 301 corresponds to the reduced image generating means described in claim 4 of the present invention. The orthogonal transform calculation unit 302 corresponds to the orthogonal transform calculation means of the present invention. The 0 coefficient adding unit 303 corresponds to the 0 coefficient adding means of the present invention. The slice generation unit 304 corresponds to the slice generation means of the present invention. The importance degree detection unit 305 corresponds to the importance degree determining means of the present invention. Second data compression unit 306
Corresponds to the reduced image compression encoding means of the present invention. First
The data compression section 300 corresponds to the frame compression coding means of the present invention. The format section 307 corresponds to the format means of the present invention. The recording unit 308 corresponds to the recording means of the present invention.

(Fourth Embodiment) The fourth embodiment of the present invention will be described below.
The embodiment will be described with reference to FIG. 5, 400 is a first data compression unit, 401 is a reduced image generation unit, 402 is an orthogonal transformation calculation unit, 403 is a 0 coefficient addition unit, 404 is a slice generation unit, 405 is a data division unit, and 406 is second data. A compression unit, 407 is a format unit, and 408 is a recording unit.

Next, the operation of this embodiment will be described. The input image signal is input to the first data compression unit 400,
It is input to the reduced image generation unit 401. The first data compression unit 400 blocks the input signal into blocks of 8 × 8 pixels, performs DCT conversion, quantization, and variable length coding in block units, and generates first compressed data.

The reduced image generation unit 401 band-limits the input image with a filter and generates a reduced image by thinning out vertically by 1/2 and horizontally by 1/2. The orthogonal transform calculation unit 402 divides the reduced image into blocks of 4 × 4 pixels, performs DCT transform in block units, and outputs DCT coefficients. As shown in FIG. 2, the 0 coefficient adding unit 403 adds 48 0 coefficients to the input block of 16 DCT coefficients to reconstruct a DCT block of 64 DCT coefficients. The slice generation unit 404 forms a macro block by combining two adjacent blocks of luminance signals and two blocks of two color difference blocks at the same position on the screen as the luminance signal blocks. Further, three macro blocks are combined to form a slice block. The data division unit 405 divides the 64 DCT coefficients of each block into important data and non-important data. The second data compression unit 406 quantizes at least important data and performs variable length coding to generate second compressed data so as not to exceed a fixed data amount in slice units. First compressed data, and second
The compressed data is input to the format unit 407.

The format unit 407 arranges the first compressed data in the first compressed data recording area and the second compressed data in the second compressed data recording area to generate recording data. The recording data is input to the recording unit 408. The recording unit 408 records the recording data on the recording medium.

As a result, it is possible to generate a special reproduction image which is free from aliasing distortion and ringing and is of very good visual quality. Further, it is possible to suppress an increase in circuit scale by performing orthogonal transformation of 4 × 4 pixels. Further, by enabling the decoder that can decode the first compressed data to decode the second compressed data, an additional circuit for decoding the second compressed data is unnecessary, and an increase in circuit scale is suppressed. You can

The reduced image generating section 401 corresponds to the reduced image generating means according to claim 5 of the present invention. The orthogonal transformation calculation unit 402 corresponds to the orthogonal transformation calculation means of the present invention. The 0 coefficient adding unit 403 corresponds to the 0 coefficient adding means of the present invention. The slice generation unit 404 corresponds to the slice generation means of the present invention. The data division unit 405 corresponds to the classification means of the present invention. The second data compression unit 406 corresponds to the reduced image compression encoding means of the present invention. The first data compression section 400 corresponds to the frame compression encoding means of the present invention. The format section 407 corresponds to the format means of the present invention. The recording unit 408 corresponds to the recording means of the present invention.

[0052]

As is apparent from the above description, according to the first configuration of the present invention, it is possible to generate a good quality reproduced image with no circuit distortion and ringing distortion.

Further, according to the second to fourth configurations of the present invention, it is possible to generate a special reproduction image of very good visual quality with a small circuit scale and without aliasing distortion or ringing. Further, by enabling the decoder that can decode the first compressed data to decode the second compressed data, an additional circuit for decoding the second compressed data is not needed, and an increase in circuit scale can be suppressed.

[Brief description of drawings]

FIG. 1 is a block diagram of a compression device according to a first embodiment of the present invention.

FIG. 2 is a diagram showing an operation of a 0 coefficient adding unit according to the first embodiment of the present invention.

FIG. 3 is a block diagram of a recording device according to a second embodiment of the present invention.

FIG. 4 is a block diagram of a recording device according to a third embodiment of the invention.

FIG. 5 is a block diagram of a recording device according to a fourth embodiment of the present invention.

FIG. 6 is a block diagram of a first conventional example.

FIG. 7 is a diagram showing an operation of an orthogonal transform calculation unit in the first conventional example.

FIG. 8 is a block diagram of a second conventional example.

FIG. 9 is a diagram showing an operation of a high frequency coefficient removing unit in the second conventional example.

FIG. 10 is a block diagram of a third conventional example.

[Explanation of symbols]

100, 201, 301, 401, 701 Reduced image generation unit 101, 202, 302, 402, 500 Orthogonal transformation calculation unit 102, 203, 303, 40 30 Coefficient addition unit 103, 200, 204, 300, 306, 400, 4
06, 501, 600, 700, 702 Data compression section 205, 307, 407, 602, 703 Format section 304, 404 Slice generation section 305 Importance detection section 406 Data division section 601 High frequency coefficient removal section 206, 308, 408, 603, 704 recording section

Claims (6)

[Claims] 1. A reduced image generation means for generating a reduced image obtained by reducing an image of a screen based on a plurality of pixel values forming an image of one screen, and a plurality of first pixel blocks included in the reduced image. To each of the orthogonal transformation calculation means, and a plurality of 0 coefficients added to each of the plurality of first pixel blocks subjected to the orthogonal transformation to add a 0 coefficient to generate a second pixel block. Means and reduced image compression coding means for generating compressed coded data for the reduced image based on each of the second pixel blocks generated by the 0 coefficient adding means, and the orthogonal transformation is performed. The compression recording device, wherein each of the plurality of first pixel blocks includes a plurality of transform coefficients. 2. A frame compression encoding means for generating compression encoded data for the image of one screen based on a plurality of pixel values forming the image of the one screen, the frame compression encoding means and the reduction. Based on the compression coded data generated by the image compression coding means,
Formatting means for generating recording data and recording means for recording the recording data on a storage medium for storing the data are further provided, and the compression encoded data generated by the frame compression encoding means is stored in the storage medium. The compression coded data recorded in the first compressed data recording area and generated by the reduced image compression coding means is recorded in the second compressed data recording area of the storage medium. The compression recording device described. 3. The reduced image compression encoding means includes the 0
3. The compression coded data for the reduced image is generated by subjecting each of the second pixel blocks generated by the coefficient adding means to quantization and variable length coding processing. The compression recording device described. 4. The reduced image compression coding means uses each of the second pixel blocks generated by the 0 coefficient adding means as an orthogonal transform block, and generates a macroblock using a plurality of the orthogonal transform blocks. Slice generating means for generating a slice using a plurality of the macroblocks, importance determining means for determining the visual importance of each macroblock, and for each macroblock included in each slice,
Compression encoding means for performing compression and variable length encoding processing so as to be within a range of code amount according to the visual importance of the macroblock, and generating compression encoded data for the reduced image; The compression amount according to claim 2, wherein the code amount according to the visual importance of each macroblock included in the slice is determined so that the data amount of the slice falls within a predetermined range. Recording device. 5. The reduced image compression coding means sets each of the second pixel blocks generated by the 0 coefficient adding means as an orthogonal transformation block, and generates a macroblock using a plurality of the orthogonal transformation blocks, Slice generating means for generating a slice using a plurality of the macroblocks, each transform coefficient included in each orthogonal transform block, a classifying means for classifying whether or not it is important, and for each slice, the slice Of the transform coefficients of the orthogonal transform blocks included in the slice so that the data amount of the data is within a predetermined range, at least the transform coefficients classified as important by the classifying unit are quantized and variable-length coded. 3. The compression encoding device according to claim 2, further comprising a compression encoding unit that performs a process to generate compression encoded data for the reduced image. Recording device. 6. The frame compression encoding means orthogonally transforms a plurality of third pixel blocks included in the one screen,
6. Quantization and variable length coding are performed, and the number of transform coefficients included in the third pixel block is equal to the number of transform coefficients included in the second pixel block. The compression recording device according to any one of 1.