Video image data compression and decompression method and device
A video image and data compression technology, applied in the field of image processing, can solve problems such as errors and the impact of estimation accuracy
Active Publication Date: 2009-11-25
ANALOGIX CHINA SEMICON
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[0004] The purpose of the present invention is to provide a method and device for compressing and decompressing video image data, which can solve the problems of the previous frame when it is necessary to use the image data information of the previous frame for video processing in the prior art, such as in motion estimation and motion compensation. Data information can usually only be decompressed from the fixed code stream block of the previous frame to obtain data blocks with different reconstruction quality, which will have a great impact on the motion estimation accuracy, and even error problems will occur
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[0036] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.
[0037] figure 1 A flow chart of a method for compressing video image data according to an embodiment of the present invention is shown, including the following steps:
[0038] S102, block the video image data;
[0039] S104, using a compression algorithm to compress the current block of video image data to obtain a code stream block;
[0040] S106, using a decoding algorithm corresponding to the compression algorithm to decode the code stream block to obtain reconstruction data of the current block;
[0041] S108. Calculate the degree of distortion of the reconstructed data relative to the uncompressed data of the current block, and store the distortion flag bit reflecting the degree of distortion into the code stream block.
[0042] In this embodiment, after the video image data is compressed, the compressed code stream blocks ar...
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The invention provides a video image data compression method, comprising the following steps: partitioning for the video image data; adopting a compression algorithm to compress the present block of the video image data to obtain a code stream block; adopting a decoding algorithm corresponding to the compression algorithm to decode the code stream block to obtain the rebuilding data of the present block; calculating the distortion degree of the rebuilding data relative to the present block before compressing and storing the distortion flag bit reflecting the distortion degree to the code stream block. The invention solves the problem in the prior art that when the former frame image data information is adopted to execute the video processing, for example, in the motion estimation and movement compensation, the former frame data information usually obtain the data blocks with different rebuilding quality only from the former frame fixed code stream block, which has larger influence on the moving estimate accuracy, even the error can appear.
Description
technical field [0001] The invention relates to the field of image processing, in particular to a method and device for compressing and decompressing video image data. Background technique [0002] In video image data compression, in order to obtain a higher compression ratio, lossy compression is usually used; in order to reduce computational complexity or hardware overhead, it is usually necessary to divide the image into blocks, such as 8×8 blocks, 32×32 Blocking, etc.; at the same time, in order to obtain a fixed compression ratio, each block is often required to have the same compression ratio. Because the high and low frequency components contained in different blocks in the image are different, the difficulty of compression is also different. According to the rate-distortion theory, when the distortion is required to be fixed, the compression ratio is not fixed; otherwise, when the compression ratio is required to be fixed, the distortion is not fixed. [0003] In th...
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Login to View More IPC IPC(8): H04N7/26H04N7/30H04N19/154H04N19/51
Inventor 张文超
Owner ANALOGIX CHINA SEMICON