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Interframe predictive coding mode quick selecting method

An inter-frame prediction and fast selection technology, applied in the field of digital video coding and decoding, can solve problems such as inability to realize real-time coding and high computational complexity, and achieve the effects of reduced computational complexity, adjustable complexity, and good image quality

Inactive Publication Date: 2007-08-22
TSINGHUA UNIV
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Problems solved by technology

[0017] Due to the presence of fractional pixel precision prediction and multi-reference frame prediction in motion search, both have large computational complexity
Although this mode selection method can have higher coding efficiency, for the real-time embedded codec system, due to the limitation of the software and hardware platform, such a mode selection method cannot realize real-time coding.

Method used

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  • Interframe predictive coding mode quick selecting method

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Embodiment Construction

[0041] The method for fast mode selection of inter-frame predictive coding proposed by the present invention is described in detail as follows with reference to the accompanying drawings and embodiments:

[0042] The present invention is mainly used on a platform with limited computing power, through an optimized sub-macroblock division method, to reduce the motion search for unnecessary sub-macroblocks, and to achieve an optimal code rate under the condition of ensuring video quality. The following examples are used to illustrate.

[0043] The method for mode selection when performing motion search on a macroblock in this embodiment includes the following steps:

[0044] 1) Calculate the cost function J in skip mode skip , if J skip 1 , then go to 9), where T 1 is the set threshold, T 1 =R×λ, R is the minimum bit value required for encoding in skip mode;

[0045] 2) Motion search is performed on the macroblock, and downsampling is used to calculate the cost function of t...

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Abstract

A method for quickly selecting mode of interframe prediction code includes calculating price function under skip mode, calculating price function of macroblock, calculating SAD value of four 8x8 sub-macroblock on said macroblock by applying full-sampling mode, obtaining relevant price function of said macroblock by carrying out 16x8 and 8x8 block motion search on said macroblock and selecting interframe prediction code mode with minimum price function to carry out motion compensation of next stage.

Description

technical field [0001] The present invention belongs to the technical field of digital video coding and decoding, and in particular, relates to a method for how to perform mode selection in inter-frame predictive coding. Background technique [0002] H.264 / AVC is a new generation of digital video codec standard jointly developed by the International Telecommunications Union (ITU) and the Joint Development Team (JVT) of the MPEG standards organization ISO. H.264 / AVC inherits the advantages of previous video coding standards and can be used not only for real-time video communication, such as video conferencing, video telephony, etc., but also for video storage, high-definition video broadcasting and streaming media. [0003] Like the previous coding standards H.263 and MPEG-4, H.264 / AVC adopts a hybrid coding mode based on predictive transformation, and at the same time absorbs the advantages of different previous standards, and has greatly improved the coding performance. . ...

Claims

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Application Information

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IPC IPC(8): H04N7/32H04N7/26H04N19/109
Inventor 戴琼海施一平尔桂花肖红江
Owner TSINGHUA UNIV
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