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CAVLC decoding method

A decoding method and a code word technology, which are applied in the field of quickly referring to the CAVLC table stipulated in the H.264/AVC specification, can solve problems such as complex calculations, and achieve the effect of reducing access time and reducing the amount of comparison processing

Inactive Publication Date: 2006-05-31
LEJIN GUANGDIAN ELECTRONIC CO LTD SHANGHAI
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Problems solved by technology

[0009] In order to solve the above problems, the present invention aims to provide users with a CAVLC decoding method that can solve computationally complex problems by referring to the CAVLC table in all systems that are applicable to the video decoding methods specified in the H.264 / AVC standard.

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Embodiment Construction

[0026] Hereinafter, the structure and function of the embodiment of the CAVLC decoding method of the present invention will be described with reference to the accompanying drawings.

[0027] The basic concept of variable length coding (VLC: Variable Length Coding) is based on the statistical characteristics generated by the data. For signal symbols with large statistical characteristics, a small number of bits are allocated, and for signal symbols with small statistical characteristics, most bits are allocated. Encoding is performed to reduce the bit allocation length of the average encoded signal.

[0028] The basic principle of this method can be simply explained by the Huffman method. Since this encoding method and the process of executing the encoding method are affected by the construction of the binary tree, the present invention proposes a retrieval method using the binary tree.

[0029] Fig. 1 is a schematic diagram of an ordinary binary search tree.

[0030] As show...

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Abstract

The method is used for decoding coded bitstream by using CAVLC codeword length table and CAVLC codeword value table according to H.264 / AVC standard, and includes follow steps: selecting the table corresponding to variable to be decoded from rearrangement table of preset CAVLC codeword length table; in the selected table, reading out bitstream of codeword length in turn from first codeword of reference column; in CAVLC codeword length table and the column accordant with the reference column, the value of CAVLC codeword value table having same codeword length with codeword length in readout bitstream stage is compared with readout bitstream; when the result is identical, saves the value of variable, and reads out the data in bitstream according to length indicated by rearrangement table.

Description

technical field [0001] The present invention relates to the invention of the variable length coding aspect of the H.264 / AVC video decoder, specifically, the invention related to the method of quickly referring to the CAVLC table stipulated in the H.264 / AVC standard. Background technique [0002] The DMB (Digital Multimedia Broadcasting: Data Multimedia Broadcasting) video specification complies with the H.264 / AVC (Advanced Video Coding: Advanced Video Coding) standard. [0003] The above-mentioned video specification is about the orderly arrangement (syntax) of the video bit stream and the specification of the decoder (decoder). The DMB video encoder following this specification uses two kinds of variable length codes (Variable Length Coding) in order to efficiently distribute the data bit stream. Coding: variable length coding) mode. [0004] According to this specification, UVLC (UniVersal Variable Length Coding: Universal Variable Length Coding) is used for data other th...

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Application Information

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IPC IPC(8): H03M7/40H04N19/129H04N19/13H04N19/44H04N19/70
Inventor 吴浚焕
Owner LEJIN GUANGDIAN ELECTRONIC CO LTD SHANGHAI
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