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Intra-frame 4*4 forecasting model selection method based on transform domain information

A prediction mode and optimal prediction mode technology, applied in image communication, digital video signal modification, television, etc., can solve the problem of high complexity in the selection process of intra-frame prediction mode, and achieve real-time video coding, reduce complexity, and complex low degree of effect

Inactive Publication Date: 2010-11-17
ZHEJIANG UNIV
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Problems solved by technology

[0003] The purpose of the present invention is to provide a new intra-frame 4×4 prediction mode selection method based on transform domain information for the defect that the intra-frame prediction mode selection process is extremely complicated in the prior art

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  • Intra-frame 4*4 forecasting model selection method based on transform domain information

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[0048] In the traditional intra-frame luma prediction process, for each mode of chroma, the processing flow of the luma macroblock to be predicted is as follows: first, intra-frame 16×16 prediction mode selection is performed on the luma macroblock: from mode 0 (vertical), mode 1 (horizontal), mode 2 (DC), and mode 3 (plane) select the mode with the smallest SATD (Sum of Absolute Transformed Differences) as the best prediction mode for the luminance macroblock under intra-frame 16×16. Then perform intra-frame 4×4 prediction mode selection on the 16 4×4 sub-blocks of the luminance macroblock: from mode 0 (vertical), mode 1 (horizontal), mode 2 (DC), mode 3 (diagonal down-left ), Mode 4 (diagonal down-right), Mode 5 (vertical-right), Mode 6 (horizontal-down), Mode 7 (vertical-left), Mode 8 (horizontal-up) select the minimum cost from nine modes The mode of is used as the best prediction mode of the 4×4 sub-block under intra-frame 4×4. Finally, the best prediction mode is select...

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Abstract

The invention discloses an intra-frame 4*4 forecasting model selection method based on transform domain information, comprising the following steps of: (1) carrying out each-mode forecasting under intra-frame 16*16 and SATD (Sum of Absolute Transformed Difference) generation to a luminance macro block, selecting the mode with a minimum SATD value as the optimum forecasting mode under intra-frame 16*16 and obtaining the value of the optimum forecasting mode, when carrying out mode 2 SATD generation under intra-frame 16*16, modifying the traditional Hadamard transform processing method for each 4*4 subblocks, extracting the direction information of each 4*4 subblock from the intermediate result and then carrying out edge-direction histogram statistic to the direction information to obtain a candidate mode set, and only searching in the range of the candidate mode set when carrying out intra-frame 4*4 forecasting model selection; (2) respectively carrying out intra-frame 4*4 forecasting model selection to each the 4*4 subblock of the luminance macro block to obtain the optimum forecasting mode and the value of the luminance macro block under intra-frame 4*4; and (3) comparing the value of the optimum forecasting mode under intra-frame 16*16 with the value of the optimum forecasting mode under intra-frame 4*4 to select the optimum forecasting mode of the luminance macro block.

Description

technical field [0001] The present invention relates to video compression coding technology, in particular to an intra-frame 4*4 prediction mode selection method based on transform domain information. Background technique [0002] H.264 was officially approved by ITU-T in 2003 as a new generation video coding standard. Compared with previous video coding standards, H.264 has been significantly improved in compression efficiency. The performance enhancement of H.264 is mainly due to its high-complexity prediction part, including intra-frame prediction and inter-frame prediction. Among them, intra-frame prediction is mainly used to remove spatial redundancy, while inter-frame prediction is mainly used to remove temporal redundancy. For intra prediction, there are 4 prediction modes of luma 16×16, 9 prediction modes of luma 4×4, and 4 prediction modes of chroma 8×8. Due to the introduction of rate-distortion optimization (RDO), on the one hand, in order to obtain the optimal...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/26H04N7/32H04N19/103H04N19/122H04N19/61
Inventor 丁勇箭庆辉王琨孙纲德宋文华张渊刘晓东叶森严晓浪
Owner ZHEJIANG UNIV
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