An encoding and decoding device and related coder

Abstract

The invention provides a coding-and-decoding device and related coder, wherein the code device is provided with a nonzero amplitude value coder, and the decoding device is equipped with a nonzero amplitude value decoder. After the code device completes encoding of zero significant bits, the nonzero amplitude value coder scans current block according to a predetermined manner, when scanning to nonzero significant bits, the nonzero amplitude value coder conducts encoding of the nonzero significant bits and continues the scanning-encoding process until scanning of the current block is completed; after the decoding device completes decoding of zero significant bits, the nonzero amplitude value decoder conducts decoding of nonzero significant bits according to the encoded mode of the nonzero amplitude value coder. The invention greatly reduces condition judging operations, comparison operations, arithmetical calculations, Boolean calculations and internal memory reading operations, and simplifies the coding-and-decoding process of significant bits; thereby the invention increases coding-and-decoding speed and decreases encoding code rate.

Description

technical field [0001] The present invention relates to the technical field of video coding and decoding, in particular to a CAVLC (Context Adaptive Variable Length Coding, Context Adaptive Variable Length Coding) coding and decoding device of an FGS (Fine Granularity Scalable, fine granularity scalable) enhancement layer. Background technique [0002] Scalable video coding is a very attractive video coding technology, which can realize arbitrary reduction of video code stream through post-coding processing. A code stream for scalable video coding includes a base layer and more than one enhancement layer. In terms of entropy coding technology, CABAC (Context Adaptive Binary Arithmetic Coding, Context Adaptive Binary Arithmetic Coding) or CAVLC technology can be selected. [0003] Currently, the H. 264 / AVC [5] in the layered coding extension SVC [4] (Scalable video coding, video layered coding), the FGS (Fine Granularity Scalable, fine granularity scalable) coding technolog...

AI Technical Summary

Problems solved by technology

When decoding, it is necessary to open up additional memory to store the position information of the mark. Similarly, when the decoding device performs decoding, it also needs to perform a large number of repeated processing processes, which makes the encoding and decoding efficiency low.

[0067] In addition, since the encoding device encodes the EOB offset table bit by bit, the decoding device needs to decode the EOB offset table bit by bit, and the encoding and decoding efficiency is low.

[0068] In addition, the optimal mapping table usually contains a large number of zero elements, and the current encoding device usually encodes the optimal mapping table bit by bit, so that there is a large amount of redundant information in the code stream, thereby increasing the encoding and decoding calculation. volume, and encoding rate

[0069] In summary, the existing FGS enhancement layer CAVLC coding method has disadvantages such as large amount of calculation, high complexity, and high coding rate.

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