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A kind of multimedia data recompression method
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A technology of multimedia data and compression method, which is applied in the direction of digital video signal modification, image communication, electrical components, etc., can solve the problems of multimedia data redundancy and no strong requirements, so as to reduce storage space, improve compression rate, reduce The effect of storage space
Active Publication Date: 2020-05-22
SOUTH CHINA UNIV OF TECH
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However, there are a large number of data blocks with strong similarity in these data blocks, and multimedia data such as pictures and videos do not have strong requirements for data accuracy. These data blocks with strong similarities can be replaced without affecting the quality of pictures and videos. The excessive decline of the current commonly used compression method will store all these similar macroblocks, which will result in a large amount of unnecessary redundant information in the compressed multimedia data
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Embodiment 1
[0056] The specific implementation system includes two parts: data recompression end and recompression data decompression end:
[0057] Use strategy a and strategy c to recompress and decompress the image data compressed by the block-based compression method
[0058] Such as Figure 6 As shown, the data recompression end mainly includes the following steps:
[0059] P1. Identify the compression format of the image data that has been compressed by the block-based compression algorithm;
[0060] P2, according to the decoding algorithm corresponding to the compression format identified in step P1, decode the YUV value of each pixel of the picture;
[0061] P3. According to the block size of the corresponding picture data compression algorithm, the YUV data of the decoded picture is divided into blocks according to the pixel position of the picture;
[0062] P4. Select a certain standard to compare the similarity of the picture block data drawn in step P3 to obtain a temporary ...
Embodiment 2
[0072] Use strategy b and strategy d to recompress and decompress video data compressed by the block-based compression method, respectively
[0073] Such as Figure 8 As shown, the data recompression end mainly includes the following steps:
[0074] P1. Identify the compression format of the video data that has been compressed by the block-based compression algorithm;
[0075] P2, according to the corresponding decoding algorithm of the compressed format identified in step P1, decode each pixel point YUV value of each video I frame;
[0076] P3, according to the block size of corresponding video data compression algorithm, the YUV data of decoded video I frame is carried out block processing according to picture pixel point position;
[0077] P4, to the video I frame after decoding, select certain standard to carry out similarity comparison to step P3 divided video I frame block data, obtain temporary file, this temporary file saves a similar block group information for each...
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Abstract
Disclosed is a multimedia data recompression method, comprising the following steps: step S1, decoding multimedia data compressed by using a block-based compression method; step S2, re-blocking the decoded multimedia data according to a given policy, performing similarity comparison on the block data, and obtaining location information of similar blocks so as to obtain similar block group information; step S3, recompressing, according to the similar block group information, the data information compressed by the corresponding compression method. The present invention has a function of recompressing the multimedia data compressed by a corresponding data compression method, and has advantages such as reducing the storage space occupied by the compressed multimedia data.
Description
technical field [0001] The invention relates to a technique for recompressing picture and video multimedia data compressed by a block-based compression method, in particular to a multimedia data recompression method. Background technique [0002] Compared with other types of data, picture and video multimedia data are characterized by a large amount of data, which is a great burden on network bandwidth and data storage. There is a large amount of redundant information in pictures and videos. The compression method of picture and video multimedia data Research has always been a research hotspot, and a relatively stable algorithm framework and currently commonly used compression algorithms have been formed. [0003] At present, the commonly used methods for compressing multimedia data such as pictures and videos are to divide the pixels in the original image or image frame into macroblocks according to a certain size, and adopt corresponding methods to compress the data of eac...
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