基于DSP的H．263图像实时编码研究与实现  

Real-time H.263 Encoding Implementation on Fixed Point DSP

作　　者：韩虎贲[1] 杨志义[1] 王鑫[1] 

机构地区：[1]西北工业大学软件学院,西安710065

出　　处：《科学技术与工程》2006年第6期697-700,705,共5页Science Technology and Engineering

摘　　要：主要介绍基于TMS320DM642 EVM开发的用于局域网视频监控系统中的视频编码器。该系统对CIF格式的图像充分利用了实时压缩编码技术,即ITU-T H．263视频压缩标准,结合DSP的编程特点,对C代码进行优化。并针对DSP结构的特点,对程序代码和应用数据进行合理的存储分配,使系统的编码速率可以达到25帧／s,满足实时性要求。Real-time video encoder following ITU-T H263 recommendation is described and relative computational loads of various encoding phases are evaluated. The current implementation shows that CIF size （352x288） images can be encoded in real-time by TMS320DM642 when computationally light motion estimation routines and basic H.263 coding mode is used. The real-time performance can be achieved using C-code and some optimization technique like SAD （Sum of Absolute Difference） with intrinsic function. In addition, careful memory management design for program code and application data are required. With presented coding scheme, up to 25 fps can be achieved.

关 键 词：H.263标准 数字信号处理器(DSP) 编码器 代码优化 

分 类 号：TN762[电子电信—电路与系统]