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Macro-block partition mode selection method in movement search

A technology of motion search and macroblock division, which is applied in the field of video coding, can solve problems affecting the speed of video coding, reduce the number of motion searches and improve the speed of the algorithm

Inactive Publication Date: 2009-04-08
SICHUAN PANOVASIC TECH
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AI Technical Summary

Problems solved by technology

This requires a large amount of calculation, which affects the speed of video encoding, especially in real-time communication, this search method is difficult to meet the actual needs

Method used

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  • Macro-block partition mode selection method in movement search
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  • Macro-block partition mode selection method in movement search

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Embodiment Construction

[0026] Taking the method of selecting the division mode of 16×16 macroblocks as an example, the division mode of 16×16 macroblocks is selected first, and then the division mode of 8×8 macroblocks is selected. The final division mode of macroblocks is determined according to different divisions mode is determined by the matching error function.

[0027] Concrete implementation steps of the present invention are as follows:

[0028] I. Carry out the division pattern selection of 16 * 16 macroblocks, the SAD value of each division block is as shown in Figure 3:

[0029] 1) A 16×16 pattern (the first pattern) is used for motion search;

[0030] 2) According to the motion search, the residual matrix and motion vector corresponding to the 16×16 block are obtained, and the SAD values ​​of the four 8×8 blocks (the fourth mode block) are calculated; the SAD values ​​of the four 8×8 blocks are respectively SAD41, SAD42, SAD43 and SAD44, their size relationship is SAD41>SAD42>SAD43>SAD...

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Abstract

The invention belongs to video encoding technology, in particular to an interframe fractional order movement searching method of H.264. The invention solves the technical problem that a selection method of a macro partition mode can rapidly partition a macro block in the movement searching. The selection method of the macro partition mode in the movement searching uses a threshold valve to judge SAD value of a partitioned block, thus judging matching degree of a block in the current mode; if the partitioned block has higher matching degree in the current mode, other modal partitions are not carried out on the partitioned block so as to reduce quantity of selection of the macro block partition mode; if the partitioned block has lower matching degree in the current mode, other modal partitions are carried out on the partitioned blocked so as to guarantee interframe precision of prediction. The invention can effectively reduce quantity of selection of the macro block partition selection mode and movement searching times of the block, thus improving arithmetic speed of an encoder.

Description

technical field [0001] The invention belongs to video coding technology, and in particular relates to an H.264 inter-frame fractional motion search method. Background technique [0002] H.264 / AVC is formulated by the Joint Video Team (JVT). This standard provides technical support for video technologies in broadcasting, storage devices, conversational services, and wireless networks. Compared with previous standards, such as: H.263, H.263+, H.263++ and MPEG -4. The video coding efficiency has been greatly improved. Under the same video quality, H.264 not only saves 50% bit rate than H.263 and MPEG-4, but also has better support for network transmission Function. H.264 / AVC adopts many new technologies, including multi-mode intra prediction, FMO (Flexible Module Order), 1 / 4 pixel precision motion estimation and motion compensation, multiple reference frame technology, loop filter technology, etc. These new technologies not only enable H.264 to have better video compression ...

Claims

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Application Information

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IPC IPC(8): H04N7/32H04N19/103H04N19/51
Inventor 方春鲁国宁
Owner SICHUAN PANOVASIC TECH
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