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Fast interframe mode selection method in H. 264

An inter-frame mode and mode technology, which is applied in the field of inter-frame mode selection of natural video sequences, can solve the problems of shortened encoding time and inconspicuous increase in encoding speed, so as to reduce complexity, reduce the range of prediction modes, and reduce complexity. Reduced effect

Active Publication Date: 2011-10-05
河南金鹏信息技术股份有限公司
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Problems solved by technology

[0008] Although the above-mentioned methods also determine the final coding mode of the inter-frame macroblock, the improvement of the coding speed is not obvious when the image quality is guaranteed and the compression efficiency is not affected, so the shortening of the coding time is still very limited.

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  • Fast interframe mode selection method in H. 264
  • Fast interframe mode selection method in H. 264
  • Fast interframe mode selection method in H. 264

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Embodiment Construction

[0031] Such as figure 1 As shown, for inter-frame macroblock coding, H.264 uses multiple macroblock and sub-macroblock partition modes for motion estimation, and an inter-frame coded 8 Four macroblock-level methods for segmentation. For the 8×8 partition mode, it can be further partitioned in four sub-macroblock-level modes of 8×8, 8×4, 4×8 and 4×4. At the same time, H.264 also allows P / B frames to be coded in an intra-frame prediction mode, that is, an intra-frame 4×4 prediction mode in 9 directions and an intra-frame 16×16 prediction mode in 4 directions. In addition to the above modes, H.264 defines the skip mode for the static background and global motion parts in the image. The skip mode does not need to encode residual signals and motion vectors, so encoding a skip mode macroblock requires only a small number of bits .

[0032] In natural video sequences, there are a large number of regions that are uniformly flat in space or static in time domain and have little moti...

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Abstract

The invention discloses a fast interframe mode selection method in H. 264, which comprises the following steps: preferentially judging a skip mode, and reducing the macroblock level mode judging range on the basis; and according to the relationship between a sub-macroblock coding mode and a quantization parameter QP, carrying out set division for a sub-macroblock level mode, selecting different sub-macroblock mode sets for macroblocks of different quantization parameters QP, and reducing the judging range of the sub-macroblock level mode. With the technical scheme of the invention, through the research and analysis of distribution situations of each prediction mode of different video sequences under different conditions, common grounds are found to reduce the range of prediction modes so as to speed up the mode judgment; in addition, through the research and analysis of sub-macroblock mode distribution of different quantization parameters QP, the mode judging method based on quantization parameters QP is further provided, so that the coding speed is further improved under the condition of very effectively keeping the quality of image compression.

Description

technical field [0001] The present invention relates to a method for selecting an inter-frame mode of a natural video sequence, in particular to a method for selecting the final encoding mode of an inter-frame macroblock that can be quickly and accurately judged in H.264 encoding technology. Background technique [0002] Among the advanced coding techniques adopted by H.264, the multi-mode coding technique of inter-frame macroblocks is one of the important factors that cause a substantial increase in complexity. In order to achieve the highest encoding efficiency, the encoder must traverse all encoding modes when encoding each macroblock, which will inevitably greatly increase the amount of calculation of the encoder, so how to quickly and accurately determine the final encoding mode of the inter-frame macroblock , while keeping the coding efficiency unaffected, it is a topic worth studying. [0003] In order to quickly determine the final coding mode of the macroblock, the...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N7/26H04N7/50H04N19/61H04N19/70
Inventor 周兵王宗敏黄雪莉
Owner 河南金鹏信息技术股份有限公司