【作者】 郑建安；

【导师】 陈辉煌； 周剑扬；

【作者基本信息】 厦门大学 ， 信号与信息处理， 2007， 硕士

【摘要】 视频压缩编码技术在多媒体信号处理领域起着至关重要的作用,它在DVD、高清晰度电视(HDTV)、可视电话和数字视频会议等领域有着广泛的应用。随着视频编码技术的发展,国际上各标准化组织制定了一系列相应的国际化标准,我国在利用这些技术推行产业化之路的同时,也面临一个高额专利权收费的问题。为此我国成立了AVS标准工作组,制定了具有自主产权的数字音视频编解码技术标准AVS(Audio Video Coding Standard)。该标准具有性能高、算法复杂度低、实现成本低以及专利授权模式简单等特点,必然能够在视频处理领域得到广泛的应用。本课题正是在AVS产业化背景下提出来的。本课题的主要工作是在DSP上实现AVS视频解码器并对其进行优化。通过对AVS视频技术标准和解码算法的深入研究和分析,提出了AVS视频解码算法的设计流程。在此基础上,以解码器开源代码为参考,通过对解码器代码进行改进,基本实现了PC上AVS视频解码,为在DSP上实现AVS视频解码器奠定基础。最后,将PC机上的解码算法C代码移植到TMS320DM642 DSP上,并充分利用DM642的特点和DSP技术,对解码流程和核心算法进行优化,大幅提高了解码速度。更多还原

【Abstract】 Video compressed coding technology is a key in the multimedia signal processing area, and is used in many fields such as DVD, HDTV, Visible telephone, digital video meeting and so on. With the development of video compressed coding technology, some International groups have brought forward a lot of standards.As our nation uses this technology, we also face a serious problem that must pay a lot of money to the patent. So, an organization named as“AVS standard working group”is founded and brought forward Audio Video Coding Standard (AVS). This standard has many good characteristics, including good performance, low complexity algorithm, low implementation cost, simplified patent warranty and so on. We have reason to forecast that AVS can find many application fields. This project is brought forward in the background of AVS industrialization.The main task of this paper is to implement and optimize the AVS video decoder on the TMS320DM642 DSP. On the base of the study and research on AVS coding standard, we raise the design flow of AVS video decoder. Then improve the open code of AVS video decoder on PC which supplies a base for the implement on DSP. At last, we replant the C code into DM642 and optimize it by some ways, such as compiler optimization, software pipeline technology and so on. After the optimization, the performance of decoder is improved greatly.更多还原