CAVLC decoding method and system

A decoding method and decoding unit technology, which are applied in the direction of television, electrical components, image communication, etc., can solve the problems of low efficiency and reduced algorithm speed-up effect, and achieve the effect of fast decoding speed.
CN102740066AInactive Publication Date: 2012-10-17FUJITSU LTD
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Patent Information

Authority / Receiving Office
CN Β· China
Current Assignee / Owner
FUJITSU LTD
Publication Date
2012-10-17
Estimated Expiration
Not applicable Β· inactive patent

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Abstract

The invention discloses a CAVLC decoding method and a system. The method completes decoding of two successive Level syntactic elements in one clock period through the following processes: finding out the prefix length and the prefix code of the (2n-1)th Level syntactic element by using a lookup table used for syntactic element Level, acquiring an amplitude code of the (2n-1)th Level syntactic element by using the prefix code, the suffix code and the suffix length of the (2n-1)th Level syntactic element, and acquiring a coefficient amplitude corresponding to the (2n-1)th Level syntactic element according to the amplitude code of the (2n-1) Level syntactic element; and finding out the code initial position of the (2n)th Level syntactic element by using the prefix length and the actual suffix length of the (2n-1)th Level syntactic element, finding out the prefix length and the prefix code of the (2n)th Level syntactic element by using the lookup table used for the syntactic element Level, acquiring an amplitude code of the (2n)th Level syntactic element according to the prefix code, the suffix code and the suffix length of the (2n)th Level syntactic element, and acquiring a coefficient amplitude corresponding to the (2n)th Level syntactic element according to the amplitude code of the (2n)th Level syntactic element.
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Description

technical field

[0001] The present invention relates to the field of video processing, more specifically to a CAVLC decoding method and system. Background technique

[0002] CAVLC (Context Adaptive Variable Length Coding) is an entropy coding technique for reducing bit rate and making full use of statistical redundancy, and is widely used in video standards such as H.264. During the CAVLC encoding process, the encoding process of the following five syntax elements is usually involved: Coeff_token, Trailing_ones_sign (referred to as T1 for simplicity), Levels, Total_zeros, and Run_before. The corresponding relationship between these five syntax elements and the relevant statistical information of the chrominance / luminance coefficient block as the coding object is as follows:

[0003]

[0004] In the CAVLC decoding process, the dependencies between symbols in the input bit stream and the unknown code length of each codeword before the codeword is decoded have a great impac...

Claims

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