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Rapid interframe mode selection method based on rate-distortion cost and mode frequency

An inter-frame mode and rate-distortion technology, applied in the field of computer vision, can solve the problem of high computational complexity, achieve good results, reduce computational overhead, and improve adaptive ability.

Inactive Publication Date: 2009-06-03
BEIHANG UNIV
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Problems solved by technology

This exhaustive inter-frame mode selection method has a very high computational complexity

Method used

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  • Rapid interframe mode selection method based on rate-distortion cost and mode frequency
  • Rapid interframe mode selection method based on rate-distortion cost and mode frequency
  • Rapid interframe mode selection method based on rate-distortion cost and mode frequency

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Embodiment Construction

[0020] As mentioned above, the present invention uses statistical information such as the rate-distortion cost value and mode occurrence frequency of video image inter-frame coding modes, as well as the correlation between spatio-temporal adjacent block coding modes, by narrowing the range of mode prediction and terminating mode prediction in advance Process and other methods realize fast inter-frame mode selection.

[0021] The implementation mode of the present invention is described below in conjunction with accompanying drawing, figure 1 The process of the present invention is explicitly shown in . First, make full mode decisions on several frames of images in the video sequence on a regular basis; second, judge whether the current macroblock to be encoded should be encoded as skip mode, if so, set the optimal encoding mode to skip mode and terminate the remaining modes If not, then according to the set to which the temporal and spatial adjacent blocks of the currently en...

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Abstract

The invention primarily utilizes the average value of the rate-distortion cost of various coded macroblocks to forecast whether the current macroblock is coded into a skip macroblock by comparing the relation between the rate distortion cost of the skip mode of a macroblock to be coded and the average value; and then the possible interframe coding mode assemble of the current macroblock to be coded is forecasted through checking the mode assemble of the adjacent macroblocks coded on time and space; the forecast begins form the most possible coding mode by using occurrence frequency of various coded macroblocks interframe coding modes; and in the forecasting process, whether to stop the forecasting process of the interframe coding mode ahead of time is decided by comparing the relation between the rate distortion cost value and the average rate distortion cost value of the mode. Under the condition that mode ergodicity is not performed, the invention directly forecasts and obtains the possible interframe coding mode assemble of the current coding block by utilizing the statistic information of the macroblock coding mode and the correlation of the coding mode among macroblocks.

Description

technical field [0001] The present invention relates to a method for selecting an inter-frame encoding mode of a video image, in particular to a method for reducing the search and calculation overhead of skip macroblocks and inter-frame macroblocks, and improving the speed of inter-frame mode selection without sacrificing image quality. The method belongs to the field of computer vision technology. Background technique [0002] Inter-frame prediction is a basic and key technology in the field of video and image processing, which has been applied in international coding standards such as H.261, H.263, H.264, MPEG-1, MPEG-2 and MPEG-4. Inter prediction is used to obtain the correlation between macroblocks in two images. The multi-mode inter-frame prediction method used in the latest international video coding standard H.264 has the advantages of wide application range and high prediction accuracy, and is an ideal inter-frame prediction method. The multi-mode inter-frame pred...

Claims

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Application Information

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IPC IPC(8): H04N7/26H04N7/64H04N7/68H04N19/103H04N19/109H04N19/147H04N19/176H04N19/503H04N19/89H04N19/895
Inventor 李炜陈志高范圣印李波周力
Owner BEIHANG UNIV
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