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Research and Implementation of H.264 coding algorithm parallelization

Author: GaoPan
Tutor: SangZuo
School: University of Electronic Science and Technology
Course: Computer System Architecture
Keywords: H.264 Multicore Multithreading Parallel aCoral
CLC: TN919.81
Type: Master's thesis
Year: 2011
Downloads: 53
Quote: 0
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Abstract


H.264 video coding standard with high video quality and bit-rate and low superiority However, this increase in computational complexity . Therefore, how to improve the coding speed become the key to improve the coding efficiency , has a very important significance to meet the large-scale sharing and high - definition real-time transmission . New opportunities for the emergence of multi-core technology to the problem through the use of task decomposition , data decomposition or decomposition of the data stream can be software serial parallel transformation of independent functional modules or data unit to be processed at the same time to obtain some speedup . H.264 coding algorithm in the picture group level , frame-level , slice level and multiple levels parallelizable macroblock level , is very suitable for the parallel transformation through the use of multi-core technology and multi- threading technology can greatly increase the H. 264 coded speed can make ordinary PC can do real - time encoding . -Depth analysis of the H.264 coding process , tap which can be parallel computing , and found that by analysis of the reference relationship between image frames adjacent to the B-frames and P-frames without reference relationships there is no dependency relationship can be at the same time independent of the encoding . For a H.264 thread -level parallelism coding algorithm with the structure of the multi-core architecture processors , making the mutual dependency between the frame parallel coding , and through research and experimentation found , according to the processor core reasonable number to set the number of B-frames can best speedup . The proposed algorithm is implemented in one of the best open source encoder T264 and parallelization encoder ported to a of multicore embedded real-time operating system aCoral final experiments show that the parallel algorithm to ensure that the image quality and bit-rate completely the same size can greatly improve the coding speed .

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