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Motion-vector-based H.264 baseline profile intra mode decision method

A technology of motion vector and intra-frame mode, applied in the field of multimedia video coding

Inactive Publication Date: 2011-09-14
BEIHANG UNIV
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Problems solved by technology

The prediction mode selection is to select the optimal mode after performing rate-distortion optimization on all modes in turn

Method used

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  • Motion-vector-based H.264 baseline profile intra mode decision method
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  • Motion-vector-based H.264 baseline profile intra mode decision method

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Embodiment Construction

[0051] In order to make the purpose, technical solution and advantages of the present invention clearer, the algorithm flow of the H.264 reference code JM8.6 for modifying intra-frame mode selection according to the present invention will be further described below in conjunction with the accompanying drawings.

[0052] The present invention provides a fast intra-frame mode selection algorithm. The algorithm achieves the purpose of reducing algorithm complexity by reducing intra-frame prediction candidate modes with the help of inter-frame motion vectors. The specific algorithm flow is according to the appended Figure 4 shown.

[0053] When the encoding process starts, first read in a frame of data, judge whether the frame is an I frame or a P frame, and then encode according to different frame types. In the case of an I-frame, traditional intra-frame prediction coding is performed on each macroblock in the frame, that is, the traversal RDO operation is performed on all intra...

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Abstract

The invention provides a motion-vector-based H.264 baseline profile intra mode decision method. The method comprises the following steps: 1) an I frame or P frame is judged, wherein traditional intra prediction coding is performed under an I frame condition, and mode information contained in a current macroblock is written into a reference mode table after the coding is completed; 2) under a P frame condition, a coder performs interframe prediction to obtain the best motion vector, and acquires reference mode information of the current macroblock and the reference mode information containing sub-blocks by searching the reference mode table according to the motion vector; and 3) intra prediction of 16*16 and 4*4, a candidate prediction mode is determined according to the reference mode information of each sub-block, rate-distortion optimization operation is performed on the candidate prediction mode to obtain an optimal intra prediction mode. By the method, the intra mode decision algorithm is simplified under a condition that the influence to coding a signal-to-noise rate is small, and the coding speed is accelerated.

Description

(1) Technical field [0001] The invention relates to the field of multimedia video coding, in particular to an intra-frame prediction mode selection algorithm for the basic level of the H.264 standard. It can ensure that the intra-frame prediction process is accelerated and the encoding speed is improved under the condition that the signal-to-noise ratio of the encoding output is basically unchanged. (2) Background technology [0002] H.264 is a video coding standard developed by the Joint Video Team (JVT / Joint Video Team) of VCEG (Video Coding Experts Group) of ITU-T and MPEG (Moving Picture Experts Group) of ISO / IEC. It is equivalent to the tenth part of ISO's MPEG-4, officially approved in May 2003. Compared with traditional video coding methods, the H.264 standard has higher coding efficiency and algorithm complexity. [0003] The H.264 standard defines three profiles, the Baseline profile, the Main profile and the Extended profile. The Basic profile supports I frames a...

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Application Information

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IPC IPC(8): H04N7/26H04N7/50H04N19/11H04N19/147
Inventor 毛峡闫晗
Owner BEIHANG UNIV
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