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A method and device for coding and decoding

A coding and code table technology, applied in the field of coding and decoding, can solve the problems of low coding efficiency, achieve the effects of reducing coding bit rate, saving code stream, and improving coding efficiency

Inactive Publication Date: 2008-09-17
HUAWEI TECH CO LTD
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Problems solved by technology

[0009] Embodiments of the present invention provide a method and device for encoding and decoding to solve the problem of low encoding efficiency in the prior art

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  • A method and device for coding and decoding
  • A method and device for coding and decoding
  • A method and device for coding and decoding

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Embodiment Construction

[0034] In the embodiment of the present invention: first, determine the number of non-zero coefficients in the current block, and encode the number of non-zero coefficients; then scan the coefficients of the current block to form a pair of binary numbers, and the pair of binary numbers is: non-zero The number of zero coefficients and non-zero coefficients before the coefficients, according to the mapping relationship, the non-zero coefficients are mapped to grades and residual amplitudes; finally, the number of zero coefficients before the non-zero coefficients, the serial number corresponding to the grade, and the residual amplitude value is encoded.

[0035] Such as image 3 As shown, it is a schematic structural diagram of an apparatus for encoding in an embodiment of the present invention. The apparatus includes a first encoding unit 11, a mapping unit 12, and a second encoding unit 13, wherein the first encoding unit 11 is used to encode non-zero coefficients in the curre...

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Abstract

The invention discloses a method for implementing coding, comprising the following steps: determining the number of nonzero coefficients in current block, and coding the number; scanning the coefficients of current block to form binary number pairs each of which is composed of the number of zero coefficients before a nonzero coefficient and the nonzero coefficient, mapping the nonzero coefficient to a level and a residual amplitude according to mapping relation; and coding the number of zero coefficients before the nonzero coefficient, the serial number corresponding to the level and the residual amplitude respectively. According to the invention, the distribution law between a Run and the level as well as the correlation between the Run and the number of nonzero coefficients are effectively used, which lowers coding bit rate, saving bit stream and improves coding efficiency. The invention also discloses a device for implementing coding, a method and a device for implementing decoding.

Description

technical field [0001] The present invention relates to image processing technology, in particular to a method and device for realizing encoding and decoding. Background technique [0002] In the prior art, the coding process is mainly as follows figure 1 As shown, the entropy coding part is an important part of the whole coding process, and the entropy coding process plays an important role in improving the compression performance. The video signal obtains residual coefficients through intra-frame prediction, or obtains residual coefficients through motion estimation and predetermined compensation, transforms and quantizes the obtained residual coefficients, scans them in a certain scanning mode, enters the entropy coding process, and encodes them to form compressed codes flow. [0003] Entropy coding was applied in the video coding process as early as 1950, as the last module of the whole video coding framework. The object of entropy coding is a series of syntax element...

Claims

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Application Information

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IPC IPC(8): H04N7/26H04N7/30H04N19/44H04N19/91
Inventor 胡昌启林四新曾鹏鑫刘盈嘉周建同高山熊联欢
Owner HUAWEI TECH CO LTD
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