A rapid selection method for video transcoding in frame mode

An intra-frame mode and video transcoding technology, applied in the field of video transcoding, can solve problems such as inapplicability, and achieve the effect of reducing computational complexity

Inactive Publication Date: 2007-10-24
WUHAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method is only suitable for video transcoding where the input video stream supports multiple intra-frame modes. For video transcoding that does not support multiple intra-frame modes for the input video stream, such as MPEG-2 to AVS transcoding is not applicable.

Method used

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  • A rapid selection method for video transcoding in frame mode
  • A rapid selection method for video transcoding in frame mode
  • A rapid selection method for video transcoding in frame mode

Examples

Experimental program
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Embodiment 1

[0010] In this embodiment, video transcoding from MPEG-2 to AVS is performed. Specific steps include:

[0011] (1) Divide the DCT coefficients of the current block into vertical, horizontal and diagonal three energy regions, and calculate the energy sum F of the vertical, horizontal and diagonal energy regions according to the following three formulas respectively 1 , F 2 , F 3 :

[0012] F 1 = Σ v = 1 7 F ( 0 , v )

[0013] F 2 = Σ u = 1 7 F ( u , 0 )

[0014] F 3 = ...

Embodiment 2

[0031] This embodiment performs video transcoding from H.263+ to AVS.

[0032] Except steps (5), (6), other are the same as embodiment 1. Steps (5), (6) are as follows:

[0033] (5) Decode the original intraframe coding mode of the current macroblock from the input H.263+ video stream, that is, the intraframe coding mode selected when performing H.263+ coding;

[0034] (6) If the original intra coding mode is the vertical mode, then the vertical mode is the candidate intra mode, if the original intra coding mode is the horizontal mode, then the horizontal mode is the candidate intra mode, if the original intra coding mode is the DC mode , then the DC mode is a candidate intra-frame mode; then go to step (7).

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Abstract

The related fast mode selection method comprises: dividing current DCT coefficients into vertical, horizontal and diagonal areas, calculating the energy sum according to the absolute value of coefficient; calculating included angle of areas to compare with threshold and primary decide the candidate frame coding mode; calculating DC coefficient difference on three directions, further deciding the coding mode according former results; finally, selecting the optimal frame mode. This invention reduces calculation complexity, and fit to different video flow.

Description

technical field [0001] The invention relates to the field of video transcoding, in particular to a method for quickly selecting an intra-frame mode in video transcoding. Background technique [0002] The operation of converting compressed video data from one form to another is called video transcoding. Since the new generation of video coding standards such as H.264 and AVS support multiple intra-frame modes (for example, AVS supports five intra-frame modes such as vertical, horizontal, DC, lower-left, and lower-right), the selection of the optimal intra-frame mode requires Computational comparisons are performed through highly complex rate-distortion optimization. Therefore, in the video transcoding for the new generation of video coding standards, the fast selection of the intra-frame mode is of great significance for reducing the computational complexity and realizing real-time video transcoding. [0003] Among the existing methods, reference 1 uses the DCT coefficients ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/26H04N7/30H04N19/11H04N19/40
Inventor 胡瑞敏韩镇朱立张新晨刘琼
Owner WUHAN UNIV
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