基于H.264编码算法的高速CCD视频压缩系统设计

为了满足航空大面阵CCD相机视频数据高速、实时传输和存储的要求，本文设计了一种基于H.264视频编码算法的压缩系统。整个压缩系统分为CCD前端、视频压缩、视频显示、视频压缩码流存储以及压缩分析单元，视频压缩单元采用高性能视频专用DSP处理器TMS320DM642，软件平台采用在CCS3.1上使用C语言实现H.264压缩算法。为了使压缩算法高效快速的运行，本文使用了DSP/BIOS资源来管理软硬件工作。 为了高速交互数据，采用了EDMA高速搬运数据策略，进而保证了数据实时传输的需要。实验结果表明，本文提出的压缩系统可以稳定正常的工作，具有良好压缩性能，在压缩比40:1~10:1范围内，平均信噪比高于35dB，满足了航空CCD相机应用的需求。

Design of CCD video compression system based on H.264 coding algorithm

In order to meet the requirement of the high-speed and real-time transmission and storage of video data in aviation wide area CCD camera, a video compression system based on H.264 compression algorithm is proposed. The system totally includes CCD before-end block, video compression and display, storage of compressed code stream and analysis of compression performance. Video compression unit takes efficient video DSP processor, TMS320DM642, as video processor in the system. The H.264 algorithm is implemented using C language in CCS3.1 platform. In order to perform efficiently and fast the compression algorithm, the system uses DSP/BIOS to manage the operation of hardware and software. To transmit efficiently data, a strategy of data moved efficiently based on EDMA is proposed, which ensure the real-time transmission. The experiments results showed that the proposed compression system can stably work and has good compressive property. In the compression ration range from 40:1 to 10:1, the average peak signal to noise ratio of proposed compression system is higher than 35dB. It meets the application of aviation CCD camera.