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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 high efficiency

Inactive Publication Date: 2010-12-08
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.

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  • Interframe predictive coding mode quick selecting method
  • Interframe predictive coding mode quick selecting method

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Embodiment Construction

[0041] The mode fast selection method of interframe predictive coding proposed by the present invention is described in detail as follows in conjunction with the accompanying drawings and embodiments:

[0042] The present invention is mainly used on a platform with limited computing power to reduce motion searches for unnecessary sub-macroblocks through an optimized sub-macroblock division method, and achieve optimal code rate while ensuring video quality. Illustrate below by embodiment.

[0043] In this embodiment, the method for selecting a mode when performing a motion search on a macroblock 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 coding in skip mode;

[0045] 2) Perform a motion search on the macroblock, and calculate the cost function of the macroblock by downsampling That is to say to replace SAD 16×...

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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 invention belongs to the technical field of digital video encoding and decoding, and specifically relates to a method for selecting a mode in inter-frame predictive encoding. Background technique [0002] H.264 / AVC is a new-generation digital video codec standard jointly formulated by the Joint Development Team (JVT) composed of the International Telecommunications Union (ITU) and the MPEG standard organization ISO. H.264 / AVC inherits the advantages of previous video coding standards. It can be used not only for real-time video communication, such as video conferencing, videophone, etc., but also for video storage, high-definition video broadcast and streaming media. [0003] Like the previous coding standards H.263 and MPEG-4, H.264 / AVC adopts the mixed coding mode based on predictive transformation, absorbs the advantages of different previous standards, and greatly improves the coding performance. . The code stream of H.264 / AVC is divided into...

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Application Information

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Patent Type & Authority Patents(China)
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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