Method for selecting quickly inter-frame mode during video transcoding

Abstract

The present invention discloses a quick selecting method for frame modes in video transferring code, the method is that: firstly, based on an average absolute value of number summation about non-zero DCT coefficients in each block of current grand block, accounting the coefficients average value and the coefficients variance of the current grand block; secondly, according to the comparison of the coefficients average values and the coefficients variance with a threshold value, primarily determining the coding modes between frames; thirdly, based on the average absolute value of number summation about non-zero DCT coefficients in each block of current grand block, computing the weighted coefficients values of four blocks existed in current grand block; and finally, based on the comparison of the weighted coefficients values with the coefficients average values and the position of the block in current grand block, determining the final coding modes between frames. The present invention makes full use of the coded input video flow's character information in the video transferring codes, such as coefficients average values, coefficients variance and weighted coefficients values, to greatly reduce the computing complexity of video transferring codes with the basically invariable codes transferring efficiency.

Description

technical field [0001] The invention relates to the field of video coding, in particular to a fast selection method 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 inter-frame modes (for example, H.264 supports 16×16, 16×8, 8×16, 8×8, 8×4, 4×8, 4 ×4 and other 7 kinds of inter-frame modes, AVS supports 16×16, 16×8, 8×16, 8×8 and other 4 kinds of inter-frame modes), and the selection of the optimal inter-frame mode requires a high-complexity rate-distortion Therefore, in the video transcoding for the next-generation video coding standard, the fast selection of the inter-frame mode is of great significance for reducing the computational complexity and realizing real-time video transcoding. [0003] Among the currently existing methods, Reference 1 proposes a top-to-bottom (from 16×...

AI Technical Summary

Problems solved by technology

However, these two methods do not make full use of the characteristic information of the encoded input video stream in video transcoding, so although the computational complexity is reduced, it is still difficult to meet the requirements of real-time transcoding, and the efficiency of transcoding is also significantly reduced.

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