Decoding method of adaptive variable length coding based on context and system thereof

Abstract

The invention discloses a decoding method of adaptive variable length coding based on a context and a system of the adaptive variable length coding, wherein the method comprises the steps of obtaining a code stream needing to be decoded; determining the non-zero coefficient number predicted value nC in the code stream; according to the predicated value nC, finding a preset first decoding code table to obtain the number of the non-zero coefficients and the number of the trailing ones in the code stream; if the number of the non-zero coefficients is more than 0 and the number of the tailing ones is more than 0, decoding the symbol of the tailing with 1 coefficients; if the number of the non-zero coefficients is less than the maximum number value of the non-zero coefficients, finding a preset second decoding code table according to the number of the non-zero coefficients, obtaining the number of total zeros before the last non-zero coefficient in the code stream; according to the number of total zeros before the last non-zero coefficient and the number of the non-zero coefficients, decoding the numbers of zeros before other non-zero coefficients in the code stream. By adoption the decoding method and the system disclosed by the invention, the storage space of the code table can be saved and the decoding efficiency can be improved.

Description

technical field [0001] The invention relates to the field of video multimedia technology development, in particular to a decoding method and system based on context-adaptive variable-length coding. Background technique [0002] H.264 is the latest generation of video compression standard jointly launched by ITU-T (International Telecommunication Union Telecommunication Standardization Organization) and MPEG (Motion Picture Experts Group). It is similar to H.263 and MPEG-4 and belongs to the predictive transformation Hybrid encoding architecture, which is divided into four main parts in the encoding process: [0003] 1) Divide each frame of video into pixel blocks; [0004] 2) Intra prediction to reduce spatial redundancy; [0005] 3) Perform inter-frame preview through motion estimation and motion compensation to reduce temporal redundancy; [0006] 4) By transforming, quantizing and entropy coding the residual block formed by the difference between the original block and...

AI Technical Summary

Problems solved by technology

[0011] (1) When parsing syntax elements, first reading the fixed-length code stream does not guarantee correct parsing. If the parsing is wrong, the code stream needs to be re-read to decode, which is inefficient; moreover, the parsing process requires a lot of judgment to control, It also affects the analysis efficiency;

[0012] (2) The storage space occupied by the decoding code table is relatively large, which is a limitation for embedded devices with limited storage space

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