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Study on Fast Mode Decision Algorithm for H.264/AVC Video Coding Standard

Author: ChenLiHua
Tutor: LiJianHua
School: Dalian University of Technology
Course: Signal and Information Processing
Keywords: H.264/AVC Mode selection Intra prediction Inter prediction Rate Distortion Optimization
CLC: TN919.81
Type: Master's thesis
Year: 2010
Downloads: 48
Quote: 0
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Abstract


H.264/AVC is a new video coding standard developed jointly by the International Telecommunication Union ITU-T Video Coding Experts Group VCEG and the International Organization for Standardization, ISO / IEC Moving Picture Experts Group (MPEG), its purpose is to improve the image compression efficiency and improve the quality of the reconstructed image. H.264/AVC video encoding high compression ratio is the cost of its high complexity of the algorithm, a huge amount of computing their wider application with the bottleneck, therefore, become a hot research to reduce the computational complexity. This article first in-depth study on the H.264/AVC video coding standard, summed up its coding theory, and expounded the previous coding standards, new key technology. Then, for the standard optimal prediction mode selection method in-depth analysis and research, and on this basis, the proposed low computational complexity prediction mode selection fast algorithm. In intra mode, for the 16 × 16 macro-blocks in the texture feature rich areas to subdivide 16 4 × 4 pixel block, and each of the 4 × 4 block has nine kinds of prediction mode coding prediction, occupy a lot of coding time the problem, first according to the change in intensity of the image inside information in Intra 4 × 4 and Intra 1 6 × 16 to make a choice, and for the Intra 4 × 4 part presents both the use of the position information of the sub-blocks, and the use of the high correlation between the SATD and RD to narrow the scope of the mode selection, while substantially maintaining the performance of the H.264/AVC coding new algorithm. Experimental results show that the algorithm only increased the few bit rate encoding speed by about 65%. In inter mode, two inter mode selection fast algorithm. One interframe algorithm macroblock-based content. The algorithm is determined by certain criteria that a current macroblock is in what area, so as to determine the range of the prediction mode of the current macro block. The encoding speed by about 18% from the experimental data show that the algorithm in PSNR decline particularly small bit rate are basically no change. Another is the use of the correlation between the correlation between the adjacent blocks optimum prediction mode and the current macroblock prediction mode to narrow mode search range, so as to achieve the purpose of reducing computational complexity. The algorithm guarantees basically no change in image quality, the encoding time is reduced by about 19.5% to the experimental results.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Communicate > Image communication, multimedia communication > Image coding
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