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Block statistical characteristic-based block matching rule and block statistical characteristic-based intra-frame encoding mode selection method

A technology of statistical characteristics and intra-frame coding, applied in the field of video image coding, which can solve the problems of less information, required bit rate, and difficulty in achieving precision.

Inactive Publication Date: 2010-11-24
SHENZHEN TEMOBI SCI &TECH +1
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Problems solved by technology

In this case, although the absolute sum SAD of the residual is large at this time, due to a large amount of redundancy, there is actually little information in the residual block (that is, the required code rate is very low). In this case, It is difficult to achieve better accuracy when using SAD as a matching criterion

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  • Block statistical characteristic-based block matching rule and block statistical characteristic-based intra-frame encoding mode selection method
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  • Block statistical characteristic-based block matching rule and block statistical characteristic-based intra-frame encoding mode selection method

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[0062] The specific implementation of the present invention will be described below in conjunction with the accompanying drawings.

[0063]The present invention considers the application of SADM matching criterion 1 in the flat area, that is, the use of block statistics to select an alternative optimal matching block; considers the application of the matching criterion that eliminates residual space redundancy, that is, the SADM matching criterion 2, in the flat area, considering 4x4 pixels have a certain relationship with the statistical characteristics of the block in the 9 candidate modes of intra-frame predictive coding, using the block statistical characteristics calculated in the SADM matching criterion sadm j , you can quickly select the intra coding mode.

[0064] Such as figure 1 It is a method for selecting a block matching criterion based on block statistical characteristics and an intra-frame coding mode in an embodiment of the present invention, which includes th...

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Abstract

The invention relates to a block statistical characteristic-based encoding method, which comprises the following steps of: determining two types of block statistical characteristic-based block matching rules; selecting a block statistical characteristic-based fast intra-frame encoding mode for flat regional blocks; and calculating two improvement directions by adopting the block statistical characteristic-based fast intra-frame encoding mode selected for the flat regional blocks. The method has the advantages of improving matching accuracy by the block statistical characteristic-based block matching rules, and improving encoding speed at the same time of ensuring rate distortion performance due to the selection of the block statistical characteristic-based fast intra-frame encoding mode.

Description

technical field [0001] This paper relates to a video image coding in the computer field, especially a block matching criterion based on block statistics and a fast intra-frame coding mode selection method. Background technique [0002] H.264 is a video coding standard proposed by experts from ITU-T and ISO to achieve higher video compression ratio, better image quality and good network adaptability. Facts have proved that H.264 encoding has the characteristics of saving code stream more than other video compression standards, and is simpler than MPEG-4 algorithm. [0003] The performance of the H.264 video coding standard largely depends on motion estimation, and the main factors affecting motion estimation are matching criteria and search algorithms. The determination of the search center and the search range can greatly improve the search efficiency. Therefore, many fast search algorithms for block matching have been proposed one after another. The basic principle of bl...

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Application Information

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IPC IPC(8): H04N7/26H04N19/11
Inventor 马国强郭晓强
Owner SHENZHEN TEMOBI SCI &TECH
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