Compression method for video encoding and decoding

Abstract

The invention relates to a compression method for video encoding and decoding. The method comprises the following steps: carrying out predication through a plurality of predication modes, and carryingout group encoding on residual error data obtained by subtracting prediction data from original data; selecting an optimal prediction mode; carrying out quantification on the residual error data under the optimal prediction mode based on qp, removing the remainder portion having smaller influence, and only carrying out compression coding on the quotient; and for storage of the compressed data, adopting a fixed-space mode for each compressed group. The compression method can effectively reduce bandwidth consumption and storage space requirements of video encoding and decoding, and can realizerandom access to the video compression data conveniently.

Description

technical field [0001] The invention relates to the field of video codec processing, in particular to a compression method applied to video codec, which compresses video data by combining lossy compression and lossless compression, so as to save codec bandwidth and storage space. Background technique [0002] Video compression and decompression is a necessary technology for network-based video transmission at present. Since the current video compression is based on inter-frame compression of motion estimation based on block matching, especially the use of multiple reference frames, the compression efficiency of coding is very high. However, the performance requirements of the codec are also greatly improved, requiring the codec end to be able to cache the original image data of multiple reference frames, which requires the codec end to be equipped with a larger storage space; moreover, with more With the use of a reference frame, the bandwidth required for encoding and decod...

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Problems solved by technology

[0003] 1. Increase the size of the dynamic memory DDR to alleviate the storage space problem required by the codec, but this will directly increase the cost;

[0004] 2. Increase the operating frequency of the memory particles to increase the data bandwidth that the memory can provide, but the high frequency brings high power consumption and subsequent high heat generation, which is difficult for ordinary handheld devices to accept;

[0005] 3. Increase the number of memory channels to obtain greater bandwidth, but this will lead to more memory particles and more PCB board routing, resulting in difficulties in PCB board wiring

[0006] If we can find a way to greatly reduce the storage space and bandwidth required for video codec without affecting the subjective quality of people, or under the condition that the impact is acceptable to a certain extent, it will be very important. meaningful

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