Adaptive variable length decoding method based on text

An adaptive and contextual technology, applied in the field of variable-length decoding, can solve the problem of non-programmability of the decoder, and achieve the effects of saving addressing time and control units, saving storage resources, and addressing rules
CN1825963AInactive Publication Date: 2006-08-30TSINGHUA UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
TSINGHUA UNIV
Publication Date
2006-08-30
Estimated Expiration
Not applicable · inactive patent

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Abstract

This invention discloses a method for an adaptive variable-length decoding based on the context controlled by a controller including decoding five grammar elements: beginning from coeff token, numbers of total coeff of non-zero factors and trailing ones of trailing one, decoding trailing one sign, the symbol of trailing one, level, the amplitude of the left non-zero coefficient, decoding of total zeros, the number of zero before the last non-zero coefficient, run before decoding number of zero from the last non-zero coefficient to the front non-zero coefficient, in which, coeff token decoding applies a multi-ID number distribution method based on the packet rule or a storage conversion method and decoding of total zeros applies the multi-ID number distribution method based on the packet rule or a code word merging method based on the relation of the code words after packet.
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Description

technical field

[0001] The present invention relates to a variable length decoding method, in particular to a context adaptive variable length decoding method. Background technique

[0002] Variable Length Coding (Variable Length Coding, abbreviated as VLC) is a lossless compression coding technique, the basic rule of which is: assign shorter codewords to characters with higher frequency of occurrence, and assign longer codewords to characters with higher frequency of occurrence lower characters. Variable length coding / decoding technology is widely used in video signal processing.

[0003] Two sets of entropy coding technologies are adopted in the latest international video coding standard H.264 / AVC, namely Context-based Adaptive Variable Length Decoding (abbreviated as CAVLC) and context-based adaptive arithmetic coding ( Context-based Adaptive Binary Arithmetic Coding, abbreviated as CABAC). The coding efficiency of CAVLC is 9-14% lower than CABAC, but its complexity is...

Claims

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