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Dynamic code table and generating method thereof

A dynamic generation and dynamic code technology, which is applied in the fields of variable length entropy coding and arithmetic coding, can solve problems such as high complexity restrictions, and achieve the effect of improving coding efficiency and reducing complexity

Inactive Publication Date: 2009-11-04
HEFEI KUNAN ELECTRONICS SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, CABAC has high coding efficiency, but due to the high complexity brought by arithmetic coding and multi-model, its application is still limited; while CAVLC, which has high coding efficiency and low complexity, is more industrial accepted by the world

Method used

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Experimental program
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Embodiment Construction

[0010] The specific implementation manner of the present invention is further illustrated below.

[0011] 1. First explain the grammatical elements of encoding:

[0012] After scanning and run-length encoding, the residual coefficients are converted into level and run sequences. Then adopt this method to complete the encoding of level and run. The syntax elements that need to be encoded are divided into:

[0013] (1) numcoeff: the number of non-zero residual coefficients.

[0014] (2) numleft1: The number of consecutive absolute values ​​of 1 at the high-frequency end of the level sequence.

[0015] (3) (lev, levpos)s: Here lev refers to the level whose absolute value is not 0 and not 1; and levpos refers to the number of consecutive levels with an absolute value of 1 adjacent to lev near the low frequency end. Form each such pair of lev and levpos into a joint pair (lev, levpos).

[0016] (4) lsigns: The symbols of all levels with an absolute value of 1 in the level sequ...

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Abstract

The invention provides a dynamic code table and a generating method thereof. The generating method comprises the following steps: sequencing all information source signs in advance according to the probability distribution obtained by statistics; distributing a serial number 0 to the sign with largest probability, distributing a serial number 1 to the sign with the probability taking second place, and by the same logic, obtaining a serial number table; tailing limited information of the information source signs through context while in encoding, carrying one-dimension or two-dimension cutoff to a two-dimension serial number, and dynamically generating a corresponding code word of the sign to be encoded according to the cutoff serial number table.

Description

technical field [0001] The invention belongs to the fields of variable-length entropy coding methods and arithmetic coding methods, and particularly relates to a novel variable-length entropy coding method for residual coefficients. Background technique [0002] At present, CAVLC and CABAC respectively represent the variable length entropy coding method and arithmetic coding method with the best performance in international video standards. Among them, CABAC has high coding efficiency, but due to the high complexity brought by arithmetic coding and multi-model, its application is still limited; while CAVLC, which has high coding efficiency and low complexity, is more industrial accepted by the world. Contents of the invention [0003] The object of the present invention is to provide a novel variable-length entropy coding method for residual coefficients aiming at the deficiencies of the prior art. Similar to CAVLC, this method adopts the basic framework of separate enco...

Claims

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Application Information

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IPC IPC(8): H04N7/26H04N7/30H04N7/50H04N19/13H04N19/132
Inventor 林润
Owner HEFEI KUNAN ELECTRONICS SCI & TECH