Encoding mode selection method and system

Abstract

The invention discloses an encoding mode selection method and system. The method comprises the following steps of: carrying out full-pixel precision motion search based on a current macro block to obtain an interframe encoding mode as an optimal first-class interframe encoding mode, wherein the interframe encoing mode has the lowest full-pixel precision encoding cost as comparsion with the current macro block and belongs to first-class interframe encoding modes; rounding up a branch-pixel precision motion vector of the current macro block in a second-class interframe encoding mode to obtain a full-pixel precision motion vector of the current macro block in the second-class interframe encoding mode; obtaining a full-pixel precision encoding cost of the current macro block in the second-class interframe encoding mode through the full-pixel precision motion vector of the current macro block in the second-class interframe encoding mode; and selecting an interframe encoding mode with a smaller full-pixel precision encoding cost as comparsion with the current macro block in the optimal first-class interframe encoding mode and the second-class interframe encoding mode as the optimal interframe encoding mode of the current macro block.

Description

technical field [0001] The present invention relates to the field of image processing, and more particularly relates to a coding mode selection method and system. Background technique [0002] In currently popular audio and video codec technologies (for example, AVS and H.264), there are two macroblock coding modes: inter-frame and intra-frame. The inter-frame coding mode can be divided into 16×16, 16×8, 8×16, 8×8, 4×8, 8×4, and 4×4 modes according to the size of the sub-block. In addition, there are skipping ( SKIP) mode and direct (DIRECT) mode are two special interframe coding modes (the SKIP mode is used in the P slice and the B slice, and the DIRECT mode is used in the B slice). The intra-frame coding mode can be divided into 16×16, 8×8, 4×4 and other modes according to the size of the sub-block, and each mode has a horizontal mode, a vertical mode, a lower-right mode, a lower-left mode, and a direct current ( DC) mode and other modes. For each macroblock, it is nece...

AI Technical Summary

Problems solved by technology

[0008] Obviously, the 1 / 4 pixel precision motion estimator 104 after the integer pixel precision first-type inter-coding mode selector 102 and the 1 / 4-pixel motion estimator implicitly included in the second-type inter-coding mode selector 108 The tasks accomplished are basically the same, so figure 1 The shown encoding mode selection device has a waste of resources, and the processing speed is relatively slow

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