JP3809306B2 - Encoder - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an encoding device and an encoding method, a decoding device and a decoding method, and an image data transmission system for high-efficiency encoding / decoding of image data such as a video signal.
[0002]
[Prior art]
In recent years, with the advancement of digital signal processing technology, it has become possible to efficiently encode a large amount of digital information such as moving images, still images, and voices, and to record on a small magnetic medium or transmit to a communication medium. . By applying such technology, multimedia devices that can handle moving images, still images, and multiple videos with different resolutions are being studied.
[0003]
FIG. 8 is a configuration example of a conventional high-efficiency encoding apparatus that can encode a low-resolution video and a high-resolution video, respectively.
[0004]
Such a high-efficiency encoding apparatus includes a video signal input terminal 801, a switching unit 802, a low-resolution video encoding unit 803, a low-resolution video code output terminal 804, a low-pass filter 805, and a downsampler 806. , A high-pass filter 807, a down sampler 808, high-frequency encoding means 809, and a high-frequency code output terminal 810.
[0005]
The video signal input terminal 801 receives either a low-resolution video signal or a high-resolution video signal having double the resolution both horizontally and vertically. The switching unit 802, the low-pass filter 803, and the high-pass This is supplied to the mold filter 807.
[0006]
If the input video signal is a high-resolution video signal, it is divided into a low-frequency signal and a high-frequency signal by a low-pass filter 805 and a high-pass filter 807 and supplied to down-samplers 806 and 808, respectively. The
[0007]
FIG. 10 shows an example of frequency division by the low-pass filter 805 and the high-pass filter 807. The low-pass filter 805 passes only the two-dimensional frequency region LL in FIG. 10, that is, the low band that is half of the high-resolution video signal both horizontally and vertically. One high-pass filter 807 passes only the LH, HL, and HH regions in FIG.
[0008]
The down sampler 806 thins out the low-frequency signal supplied from the low-pass filter 805 in half both horizontally and vertically, converts it into a video signal having the same number of pixels as the low-resolution video, and supplies the video signal to the switching means 802.
[0009]
The switching unit 802 selects either the video signal directly supplied from the video signal input terminal 801 or the video signal supplied from the downsampler 806 and supplies this to the low resolution video encoding unit 804.
[0010]
When the input signal to the video signal input terminal 801 is a high resolution video signal, the video signal supplied from the downsampler 806 is selected. When the input signal is a low resolution video signal, the video signal input terminal A video signal directly supplied from 801 is selected.
[0011]
The low-resolution video encoding unit 803 converts the signal supplied from the switching unit 803 into a low-resolution video code through each process of blocking, orthogonal transformation, quantization, and entropy encoding, and outputs this to the low-resolution video code Output to terminal 804.
[0012]
The downsampler 808 thins out the high-frequency signal supplied from the high-pass filter 807 in the horizontal and vertical directions and supplies the thinned high-frequency signal to the high-frequency encoding unit 809. The high frequency encoding means 809 converts the supplied signal into a high frequency code by each process of quantization entropy encoding, and outputs this to the high frequency code output terminal 810.
[0013]
Next, a configuration example of a conventional decoding device will be described with reference to FIG.
[0014]
Such a decoding apparatus includes a low-resolution video code input terminal 901, a low-resolution video decoding unit 902, a switching unit 903, a video signal output terminal 904, a high-frequency code input terminal 905, and a high-frequency decoding unit 906. An up-sampler 907, a low-pass filter 908, an up-sampler 909, a high-pass filter 910, and an adder 911.
[0015]
The video code supplied to the low resolution video code input terminal 901 is supplied to the low resolution video decoding means 902. When this video code is obtained from a high-resolution video signal at the time of encoding, it corresponds to the frequency band LL in FIG.
[0016]
The low-resolution video decoding unit 902 performs entropy decoding, inverse quantization, inverse orthogonal transform, and rasterization on the supplied video code to decode the video signal, and the decoded video signal is switched to the switching unit 903 and the upsampler. 907.
[0017]
On the other hand, the high frequency code supplied to the high frequency code input terminal 905 is supplied to the high frequency decoding means 906. The high frequency code is a code obtained by encoding the frequency bands LH, HL, and HH in FIG. 10 when encoding a high resolution video signal.
[0018]
The high frequency decoding means 906 entropy decodes and dequantizes the high frequency code, and supplies it to the upsampler 909.
[0019]
Up-samplers 907 and 909 insert zeros horizontally and vertically into the supplied signal sequence, and supply them to a low-pass filter 908 and a high-pass filter 910, respectively.
[0020]
The low-pass filter 908 passes only the signal belonging to the band LL shown in FIG. 10 in the signal sequence supplied from the upsampler 907 and supplies the signal to the adding unit 911.
[0021]
On the other hand, the high-pass filter 910 passes only signals belonging to the bands LH, HL, or HH shown in FIG. 10 in the signal sequence supplied from the upsampler 909 and supplies the signals to the adding unit 911.
[0022]
The adding means 911 adds the signal from the low-pass filter 908 (band LL) and the signal from the high-pass filter 910 (bands LH, HL, HH), and regenerates the entire band of the high-resolution video. Configure and supply to the switching means 903.
[0023]
When the code supplied to the decoding device is a code related to a low-resolution video, the switching unit 903 selects a signal supplied from the low-resolution video decoding unit 902, and the supplied code is a high-resolution video. In the case of the reference sign, the signal supplied from the adding means 911 is selected and output to the video signal output terminal 904.
[0024]
As described above, in the conventional encoding device and decoding device, the low-resolution video encoding / low-resolution video decoding means similar to the conventional low-resolution video is used for encoding / decoding the low-frequency portion of the high-resolution video. By using it, compatibility is realized with a conventional device that handles only low-resolution video. That is, if only the low-resolution video code is supplied to the conventional decoding device, the low-frequency portion of the high-resolution video can be reproduced.
[0025]
[Problems to be solved by the invention]
However, in the conventional apparatus, while realizing compatibility with the conventional apparatus that handles only the low-resolution video, attention is paid to the quality as the encoding and decoding of the high-resolution video. / Deterioration in the low resolution decoding means has a great influence on encoding and decoding of the entire high resolution video, and there is a problem that sufficient quality cannot be realized.
[0026]
Accordingly, an object of the present invention is to provide a code capable of encoding or decoding a low-resolution video and a high-resolution video, respectively, without losing compatibility with a device that supports only a low-resolution video while maintaining high quality image quality. An encoding apparatus and encoding method, a decoding apparatus and decoding method, and an image data transmission system are provided.
[0027]
[Means for Solving the Problems]
According to the present invention, input means for inputting low-resolution image data or high-resolution image data, and dividing means for dividing the high-resolution image data into low-frequency component data and first high-frequency component data A first encoding unit that encodes the low-resolution image data or the low-frequency component data, a second encoding unit that encodes the first high-frequency component data, and a high-pass filter. And extracting means for extracting second high-frequency component data, which is high-frequency component data in the low-frequency component data, by filtering and down-sampling the low-frequency component data, and when the predetermined condition is satisfied, the extraction Adding means for inputting the second high-frequency component data extracted by the means to the second encoding means, wherein the first encoding means includes data A block forming unit for dividing the block into a plurality of blocks is configured to perform the encoding process in units of the blocks, and the adding unit is configured to satisfy the predetermined condition for each of the blocks in units of the blocks, The second high-frequency component data extracted by the extraction unit is configured to be input to the second encoding unit, and the predetermined condition is a condition related to a quantization parameter in the first encoding unit; An encoding device is provided.
[0028]
According to the present invention, the input means for inputting low resolution image data or high resolution image data, and the division for dividing the high resolution image data into low frequency component data and first high frequency component data. Means, a first encoding means for encoding the low-resolution image data or the low-frequency component data, a second encoding means for encoding the first high-frequency component data, and a high-pass type Filtering the low-frequency component data using a filter and extracting the second high-frequency component data, which is high-frequency component data in the low-frequency component data by down-sampling, when a predetermined condition is satisfied, Adding means for inputting the second high-frequency component data extracted by the extraction means to the second encoding means, and the predetermined condition is an image Encoding apparatus is provided which is characterized in that the condition related Activity information.
[0029]
According to the present invention, the input means for inputting low resolution image data or high resolution image data, and the division for dividing the high resolution image data into low frequency component data and first high frequency component data. Means, a first encoding means for encoding the low-resolution image data or the low-frequency component data, a second encoding means for encoding the first high-frequency component data, and a high-pass type Filtering the low-frequency component data using a filter and extracting the second high-frequency component data, which is high-frequency component data in the low-frequency component data by down-sampling, when a predetermined condition is satisfied, Adding means for inputting the second high-frequency component data extracted by the extraction means to the second encoding means, and the first encoding means comprises: A block forming unit that divides the data into a plurality of blocks, and is configured to execute the encoding process in units of the blocks, and the adding unit satisfies the predetermined condition for each of the blocks in units of the blocks In this case, the second high-frequency component data extracted by the extraction unit is configured to be input to the second encoding unit, and the predetermined condition is a condition relating to a code amount for each block. Is provided.
[0065]
[Form of the present invention]
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described with reference to the drawings.
[0066]
FIG. 1 is a block diagram of a high-efficiency encoding apparatus according to an embodiment of the present invention.
[0067]
In FIG. 1, a high-efficiency encoding apparatus includes a video signal input terminal 101, a switching unit 102, a low-resolution video encoding unit 103 as the first encoding unit, and an output terminal 104 for a low-resolution video code. The low-pass filter 105 and down-sampler 106 or the high-pass filter 111 and down-sampler 112 as the dividing means, the extracting means 107, the suppressing means 108 as the adding means, and the second encoding A high-frequency encoding unit 109 as a unit and an output terminal 110 for a high-frequency code are provided.
[0068]
Next, the operation of the high-efficiency encoding device having such a configuration will be described.
[0069]
First, a case where a low-resolution video is input to the video input terminal 101 will be described. The low resolution video signal supplied to the video input terminal 101 is supplied to the low resolution video encoding unit 103 via the switching unit 102.
[0070]
As shown in FIG. 2, the low-resolution video encoding unit 103 includes a blocking unit 201, an orthogonal transform unit 202, a quantization unit 203, and an entropy encoding unit 204. Are divided into blocks, orthogonal transformation is performed on a block basis, and the transform coefficients are quantized and encoded. The low resolution video encoding unit 103 outputs the code to the output terminal 104.
[0071]
Here, the quantization unit 203 divides the orthogonal transform coefficient supplied in units of blocks from the orthogonal transform unit 202 by a divisor according to the quantization parameter, and supplies it to the entropy coding unit 204, where the divisor is 1 or more. As the value is a positive integer, the larger the value, the easier the image quality deterioration due to encoding occurs, and the block area in which 1 is selected as the divisor is extremely small in image quality deterioration due to encoding.
[0072]
Next, a case where a high-resolution video is input to the video input terminal 101 will be described. In the present embodiment, it is assumed that the high-resolution video has twice as many pixels as the low-resolution video in both horizontal and vertical directions. That is, when the low-resolution video is composed of n × m pixels, the high-resolution video is N × M (N = 2n, M = 2m).
[0073]
The high-resolution video signal supplied to the video input terminal 101 is supplied to the low-pass filter 105 and the high-pass filter 111.
[0074]
The high-resolution video signal is frequency-divided into a low-frequency signal and a high-frequency signal by the low-pass filter 105 and the high-pass filter 111 and supplied to the downsampler 106 or 112, respectively.
[0075]
FIG. 7A shows an example of frequency division by the low-pass filter 105 and the high-pass filter 111. The low-pass filter 105 passes only the two-dimensional frequency region LL in FIG. 7A, that is, the low band that is half of the high-resolution video signal in both horizontal and vertical directions.
[0076]
On the other hand, the high-pass filter 111 passes only the LH, HL, and HH castles in FIG.
[0077]
The downsampler 112 thins out the signal sequence supplied from the high-pass filter 111 in half in both horizontal and vertical directions and supplies the thinned signal sequence to the high-frequency encoding unit 109.
[0078]
The down sampler 106 thins out the low-frequency signal supplied from the low-pass filter 105 in half both horizontally and vertically, converts it to a low-resolution video having the same number of pixels as the low-resolution video, and supplies the low-resolution video to the switching means 102 and the extraction means 107. To do.
[0079]
The switching unit 102 selects the low frequency signal supplied from the down sampler 106 and supplies it to the low resolution video encoding unit 103. The low-resolution video encoding unit 103 encodes the supplied low-frequency signal by performing processing of blocking, orthogonal transform, quantization, and entropy encoding, and suppresses the code with the output terminal 104. Means 108.
[0080]
The extraction unit 107 extracts a signal for reinforcing the deterioration of encoding from the low resolution video signal supplied from the down sampler 106 and supplies the extracted signal to the suppression unit 108. Here, the processing of the extracting means 107 will be specifically described with reference to FIG. The extraction unit 107 extracts a high frequency component that significantly deteriorates in encoding of a low resolution video as a signal for reinforcement.
[0081]
In FIG. 3, the extraction unit 107 includes a high-pass filter 301 and a downsampler 302. The high-pass filter 301 extracts a high-frequency component of the low-frequency signal supplied from the down sampler 106 and supplies the high frequency component to the down sampler 302.
[0082]
The high-frequency component here is a component excluding the lowest frequency component among the low-frequency signals divided into four, and is a component in the LLLH, LLHL, and LLHH regions shown in FIG.
[0083]
The down sampler 302 thins out the signal sequence related to the supplied high frequency component in half in both the horizontal and vertical directions, and supplies it to the suppression means 108.
[0084]
The suppression unit 108 suppresses the high frequency signal extracted by the crawling unit 107 in accordance with the code of the low frequency signal supplied from the low resolution video encoding unit 103 and supplies the high frequency signal to the high frequency encoding unit 109. Here, the processing of the suppressing means 108 will be specifically described with reference to FIG.
[0085]
In FIG. 4, the suppression unit 108 includes a detection unit 401 and a selection unit 402. The detection unit 401 extracts a quantization parameter included in the code string supplied from the low resolution video encoding unit 103 and supplies a control signal corresponding to the parameter to the selection unit 402.
[0086]
The selection unit 402 selectively supplies the high frequency signal supplied from the extraction unit 107 to the high frequency encoding unit 109 according to the control signal. In the present embodiment, since it is considered that image quality degradation is in an allowable range for a block region whose quantization divisor indicated by the quantization parameter is equal to or smaller than a predetermined value, a high frequency signal to the high frequency encoding means 109 is considered. Shut off the supply.
[0087]
On the other hand, in a block region where the divisor of quantization exceeds a predetermined value, it is considered that unacceptable image quality degradation occurs, so the high frequency signal in the corresponding region is supplied as a reinforcement signal to the high frequency encoding means 109.
[0088]
Note that the suppression means 108 detects the necessity of suppression based on the amount of code information in units of blocks instead of the divisor of quantization, and the same applies to the process of replacing the reinforcement signal (high frequency signal) to be suppressed with an invalid value. Effects can be obtained. Further, it is possible to detect the necessity of suppression based on the activity information of the image.
[0089]
Finally, the high-frequency encoding means 109 is a high-frequency signal among the high-frequency video high-frequency signal supplied from the high-pass filter 111 and the high-resolution video low-frequency signal supplied from the suppression means 108. And a high frequency code are generated and output to the high frequency code output terminal 110.
[0090]
The codes output from the output terminals 104 and 110 are received and decoded on the receiving side.
[0091]
Next, a high efficiency decoding apparatus corresponding to the above-described high efficiency encoding apparatus will be described. FIG. 5 is a block diagram of such a high-efficiency decoding device.
[0092]
5, the high-efficiency decoding apparatus includes a low-resolution video code input terminal 501, a low-resolution video decoding means 502, a switching means 503, a video signal output terminal 504, and a high-frequency code input terminal 505. , High-frequency decoding means 506, reinforcing means 507, up-sampler 508, low-pass filter 509, adding means 510, up-sampler 511, and high-pass filter 512. Note that the input terminal 501 and the input terminal 505 can transmit codes by being connected to the output terminal 104 and the output terminal 110 of the above-described high-efficiency encoding apparatus through appropriate transmission lines, respectively. it can. In addition, when a code related to a low-resolution video is input, the switching unit 503 connects the video signal output terminal 504 and the low-resolution video decoding unit 502 so that the code related to the high-resolution video is input. In this case, the video signal output terminal 504 and the adding means 510 are connected.
[0093]
Regarding the operation of the high-efficiency decoding device having such a configuration, first, a case where a low-resolution video code encoded by the high-efficiency encoding device is supplied will be described.
[0094]
The low resolution video code supplied to the low resolution video code input terminal 501 is supplied to the low resolution video decoding means 502, where entropy decoding, inverse quantization, inverse orthogonal transform, and rasterization are performed. The decoded video signal is supplied to the switching unit 503 and output to the video signal output terminal 504.
[0095]
Next, a case where a high-resolution video code encoded by the high-efficiency encoding device is supplied will be described.
[0096]
The video code supplied to the input terminal 501 corresponds to the signal in the frequency band LL in FIG. The low-resolution video decoding unit 502 performs entropy decoding, inverse quantization, inverse orthogonal transform, and rasterization on the video code supplied from the input terminal 501 to decode the video code, and supplies it to the reinforcement unit 507. .
[0097]
On the other hand, the high frequency code supplied to the input terminal 505 is supplied to the high frequency decoding means 506. The high-frequency code is a code obtained by encoding the signals of the frequency bands LH, HL, and HH in FIG. 7A and the frequency bands LLLH, LLHL, and LLHH in FIG. 7B when a high-resolution video is encoded. It is.
[0098]
The high-frequency decoding unit 506 entropy-decodes and inverse-quantizes the high-frequency code, and a signal sequence corresponding to the frequency bands LLLH, LLHL, and LLHH is supplied to the reinforcing unit 507 and the frequency bands LH, HL, and HH. Is supplied to the up-sampler 511.
[0099]
The reinforcing unit 507 reinforces the deterioration included in the signal supplied from the low resolution video decoding unit 502 with the signal supplied from the high frequency decoding unit 506 and supplies the signal to the upsampler 508. FIG. 6 is a block diagram of the reinforcing means 507.
[0100]
In FIG. 6, the reinforcing means 507 includes a low-pass filter 601, an adding means 602, a switching means 603, an upsampler 604, a high-pass filter 605, and a detection means 606.
[0101]
The low-pass filter 601 extracts the low-frequency signal of the supplied low-resolution video, that is, the frequency band LLLL in FIG. 7B and supplies it to the adding unit 602. The up-sampler 604 inserts 0 horizontally and vertically into the supplied signal sequence and supplies it to the high-pass filter 605.
[0102]
The high-pass filter 605 passes only the band LLLH, LLHL, and LLHH components in the supplied signal sequence and supplies them to the adding means 602.
[0103]
The adding unit 602 adds the supplied band LLLH, LLHL, and LLHH signals and the band LLLL signal, reconfigures the band LL signal in FIG.
[0104]
The detecting unit 606 takes out the quantization parameter included in the code string supplied from the low resolution video code input terminal 501 and supplies a control signal corresponding to the parameter to the switching unit 603.
[0105]
The switching unit 603 selects one of the signal directly supplied from the low resolution video decoding unit 502 and the signal reconstructed by the adding unit 602 according to the control signal, and supplies the selected signal to the upsampler 508. Here, in correspondence with the above-described high-efficiency encoding device, it is determined that reinforcement is not necessary in the block region where the quantization divisor indicated by the quantization parameter is a predetermined value or less, and the low-resolution video decoding means A signal directly supplied from 502 is selected and output. Further, in the block area where the divisor exceeds a predetermined value, it is determined that the deterioration cannot be allowed, and the signal supplied from the adding means 602 is selected and output.
[0106]
The up-sampler 508 inserts 0 in the horizontal and vertical directions with respect to the supplied signal sequence, and supplies it to the low-pass filter 509. The low-pass filter 509 passes only the band LL in FIG. 7A in the signal sequence supplied from the upsampler 508 and supplies the band LL to the adding unit 510.
[0107]
On the other hand, the up-sampler 511 inserts 0 in the horizontal and vertical directions with respect to the supplied signal string, and supplies the signal string to the high-pass filter 512. The high-pass filter 512 passes only the bands LH, HL, and HH in the signal sequence supplied from the upsampler 511 and supplies the same to the adding unit 510.
[0108]
The adding unit 510 adds the supplied band LL and the bands LH, HL, and HH to reconstruct the entire band of the high-resolution video, and supplies it to the switching unit 503. The switching unit 503 selects the signal supplied from the adding unit 510 and outputs it to the video signal output terminal 504.
[0109]
As described above, in the high-efficiency encoding device and the high-efficiency decoding device of this embodiment, the encoding means for the low-resolution video as in the past is used for encoding and decoding the low-frequency component of the high-resolution video signal. In addition, since the decoding means is used, high compatibility with a conventional apparatus that does not support high-resolution video can be maintained.
[0110]
On the other hand, high-frequency components (corresponding to LLHH, LLHL, and LLLH) in the low-frequency components are separately extracted and encoded together with high-frequency components (corresponding to HH, HL, and LH) of the high-resolution video signal. Also, by decoding this to reinforce the deterioration of the low frequency component, high video quality can be realized. In this case, since it is possible not to reinforce a region where there is little or no deterioration, the amount of information can be reduced and the coding efficiency is not impaired.
[0111]
In this embodiment, the low frequency component code and the high frequency component code are separated and input / output between the encoding device and the decoding device, but these codes are multiplexed and output / input. May be. That is, an apparatus for recording these codes mixedly on the same track of the magnetic recording tape or transmitting the codes by frequency multiplexing and using a single carrier wave is also included in the present invention.
[0112]
Although the preferred embodiments of the present invention have been described above, the object of the present invention is to store a storage medium (or recording medium) that records software program codes for realizing the functions of the above-described embodiments in a system or apparatus. Needless to say, this can also be achieved by supplying and executing the program code stored in the storage medium by the computer (or CPU or MPU) of the system or apparatus. In this case, the program code itself read from the storage medium realizes the functions of the above-described embodiments, and the storage medium storing the program code constitutes the present invention. Further, by executing the program code read by the computer, not only the functions of the above-described embodiments are realized, but also an operating system (OS) running on the computer based on the instruction of the program code. It goes without saying that a case where the function of the above-described embodiment is realized by performing part or all of the actual processing and the processing is included.
[0113]
Furthermore, after the program code read from the storage medium is written into a memory provided in a function expansion card inserted into the computer or a function expansion unit connected to the computer, the function is determined based on the instruction of the program code. It goes without saying that the CPU or the like provided in the expansion card or the function expansion unit performs part or all of the actual processing, and the functions of the above-described embodiments are realized by the processing.
[0114]
【The invention's effect】
As described above, according to the present invention, a low-resolution video and a high-resolution video are respectively encoded or encoded without maintaining compatibility with a device that supports only a low-resolution video while maintaining high quality image quality. Can be decrypted.
[Brief description of the drawings]
FIG. 1 is a block diagram of a high-efficiency encoding apparatus according to an embodiment of the present invention.
FIG. 2 is a block diagram of low-resolution video encoding means 103. FIG.
FIG. 3 is a block diagram of extraction means 107. FIG.
4 is a block diagram of suppression means 108. FIG.
FIG. 5 is a block diagram of a high efficiency decoding device according to an embodiment of the present invention.
6 is a block diagram of reinforcing means 507. FIG.
FIG. 7A is a diagram showing a mode in which a video signal is divided into a high frequency component and a low frequency component.
(B) It is a figure which shows the aspect which further divided | segmented the low frequency component.
FIG. 8 is a block diagram of a conventional high-efficiency encoding device.
FIG. 9 is a block diagram of a conventional high efficiency decoding device.
FIG. 10 is a diagram illustrating a mode in which a video signal is divided into a high frequency component and a low frequency component in the prior art.
[Explanation of symbols]
101 Video signal input terminal
102 Switching means
103 Low resolution video encoding means
104 Low resolution video code output terminal
105 Low-pass filter
106 Downsampler
107 Extraction means
108 Suppression means
109 High frequency encoding means
110 High-frequency code output terminal
111 High-pass filter
112 Downsampler
501 Low resolution video code input terminal
502 Low-resolution video decoding means
503 switching means
504 Video signal output terminal
505 High frequency code input terminal
506 High frequency decoding means
507 Reinforcing means
508 Upsampler
509 Low-pass filter
510 addition means
511 Upsampler
512 high-pass filter

Claims (9)

Input means for inputting low resolution image data or high resolution image data;
Dividing means for dividing the high-resolution image data into low-frequency component data and first high-frequency component data;
First encoding means for encoding the low-resolution image data or the low-frequency component data;
Second encoding means for encoding the first high-frequency component data;
An extraction means for filtering the low-frequency component data using a high-pass filter and extracting second high-frequency component data that is high-frequency component data in the low-frequency component data by down-sampling ;
When a predetermined condition is satisfied, and adding means for inputting the second high-frequency component data extracted by said extracting means into said second encoding means,
With
The first encoding means includes a blocking unit that divides data into a plurality of blocks, and is configured to execute an encoding process in units of the blocks.
The adding unit inputs the second high frequency component data extracted by the extracting unit to the second encoding unit when the predetermined condition for each block is satisfied in units of the block. Configured,
The encoding apparatus according to claim 1, wherein the predetermined condition is a condition relating to a quantization parameter in the first encoding means . It said additional means, the divisor which the quantization parameter is indicated, when more than a predetermined value, wherein said second high-frequency component data to claim 1, characterized in that do not enter into the second coding means Encoding device. Input means for inputting low resolution image data or high resolution image data;
Dividing means for dividing the high-resolution image data into low-frequency component data and first high-frequency component data;
First encoding means for encoding the low-resolution image data or the low-frequency component data;
Second encoding means for encoding the first high-frequency component data;
An extraction means for filtering the low-frequency component data using a high-pass filter and extracting second high-frequency component data that is high-frequency component data in the low-frequency component data by down-sampling;
An adding means for inputting the second high frequency component data extracted by the extracting means to the second encoding means when a predetermined condition is satisfied;
With
The encoding apparatus according to claim 1, wherein the predetermined condition is a condition related to activity information of an image. Input means for inputting low resolution image data or high resolution image data;
Dividing means for dividing the high-resolution image data into low-frequency component data and first high-frequency component data;
First encoding means for encoding the low-resolution image data or the low-frequency component data;
Second encoding means for encoding the first high-frequency component data;
An extraction means for filtering the low-frequency component data using a high-pass filter and extracting second high-frequency component data that is high-frequency component data in the low-frequency component data by down-sampling;
An adding means for inputting the second high frequency component data extracted by the extracting means to the second encoding means when a predetermined condition is satisfied;
With
The first encoding means includes a blocking unit that divides data into a plurality of blocks, and is configured to execute an encoding process in units of the blocks.
The adding unit inputs the second high frequency component data extracted by the extracting unit to the second encoding unit when the predetermined condition for each block is satisfied in units of the block. Configured,
The encoding apparatus according to claim 1, wherein the predetermined condition is a condition relating to a code amount for each block. A code according to the first coding means, and the code according to the second coding means, in any one of claims 1 to 4, further comprising a multiplexing means for outputting the multiplexed The encoding device described. 6. The encoding apparatus according to claim 5 , wherein the multiplexing unit performs time multiplexing. 6. The encoding apparatus according to claim 5 , wherein the multiplexing unit performs frequency multiplexing. The dividing means is
A two-dimensional low-pass filter and a two-dimensional downsampler;
A two-dimensional high-pass filter and a two-dimensional downsampler;
Encoding apparatus according to any one of claims 1 to 7, further comprising a. The dividing means is
A horizontal one-dimensional low-pass filter, a horizontal one-dimensional downsampler, a vertical one-dimensional low-pass filter, and a vertical one-dimensional downsampler;
A horizontal one-dimensional high-pass filter, a horizontal one-dimensional downsampler, a vertical one-dimensional high-pass filter, and a vertical one-dimensional downsampler;
The encoding apparatus according to any one of claims 1 to 8 , further comprising:

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