摘要
本课题研究的内容是基于Blackfin处理器ADSP-BF537架构的H.264视频编码器的实现与优化。本文重点论述了视频编码器在BF537-STAMP开发平台上的实现及优化过程。
论文首先对视频压缩编码原理及相关国际标准做了简要说明,然后详细介绍了H.264视频编码标准的特点、采用的新技术及针对不同应用领域的级别划分。本文论述的重点是编码器的实现和优化。
在编码器的实现部分,论文首先介绍了ADSP-BF537处理器的架构及编码器的开发平台,然后阐述了编码器的原理、特性、实现流程及功能模块划分,最后介绍了编码器的移植过程,并给出了未优化前编码器各模块的运行时间比例。
在编码器的优化部分,论文重点介绍了在编码器优化过程中所采用的多种优化策略和技巧,描述了在结构、代码、处理器指令等方面所采用的优化方法及相关的测试和分析。
论文最后对编码器的优化结果进行了测试,总结了全文,并对下一步的工作进行了展望。
Real-time video images communication needs efficient implementation and optimization about the video compression algorithms on power-efficient platforms. To meet such needs several compression methodologies and techniques have been proposed and standardized. This thesis presents the implementation details of H.264/AVC encoder on ADSP-BF537 processor based Analog Devices BF537-STAMP board, and gives several optimization techniques which have been concurrently employed in this work to improve the performance of the encoder.
At the beginning of this thesis, it briefly introduces the video coding theory and the relevant international standards. Then the characteristic of H.264 standard and the new technology which adopted in H.264 are described in details.
It also elaborates the features of the processor ADSP-BF537 and the platform which is used to run and test the encoder.
This thesis focuses on the implementation and optimization of H.264 encoder.
In the part of the implementation, firstly, it introduces features of the processor ADSP-BF537 and the platform which used to run and test the encoder, then, it elaborates the principle of the encoder, the characteristics of the Baseline profile encoder, the implementation processes and the module division, at last, it describes the process of porting the encoder and the running time ratio of different modules.
In the part of the optimization, it mainly presents all kinds of strategies and techniques adopted in the optimization process and it describes the optimization methods in structure, code, and processor instruction etc, also it gives the test and analysis.
Finally, it gives the result of the test, concludes the entire thesis and addresses the next stage of the work.
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