一种实时视频压缩系统设计及硬件实现  

Real-time video compression system design and hardware implementation

作　　者：徐冬冬[1,2] 王文华[1] 张宇[1] 付天骄[1] 任建岳[1] 

机构地区：[1]中国科学院长春光学精密机械与物理研究所,吉林长春130033 [2]中国科学院大学,北京100039

出　　处：《光电子．激光》2015年第9期1747-1752,共6页Journal of Optoelectronics·Laser

基　　金：国家高技术研究发展计划(863-2-5-1-13B)资助项目

摘　　要：针对可见光相机CMOS输出大数据量时出现压缩系统实时传输困难的问题,提出了一种基于ADV212的实时视频压缩方案。首先根据CMOS视频格式以及ADV212工作原理,提出利用Custom-specific工作模式为各种格式的视频提供接口,并通过FPGA内部的块RAM以及SDRAM的乒乓操作对数据进行缓存,显著地提高了工作效率;之后,为了适用于不同应用场合,本文方法实现了码流的存储后传输以及直接传输之间的切换,并通过纠错编码极大地提升了闪存的纠错能力;最后,为了验证方法的可行性,基于压缩板以及解压板进行了实验验证。结果表明,压缩系统可实现实时稳定的工作,通过软件设置,系统可以实现极高的压缩比,压缩比为80∶1时的平均峰值信噪比(PSNR)为28.238dB,压缩比为150∶1时的PSNR为26.165dB,解决了在大数据量下压缩系统硬件实现困难以及实时传输困难等问题。As the amount of the output for visible light CMOS camera is mounted, the transmission rate of the compression system is more and more concerned. For solving this problem we design a real-time vid- eo compression system based on the ADV212. First and foremost, the custom-specific mode is used for various video formats, considering the CMOS video format and the working principle of the ADV212. Through the field-programmable gate array （FPGA） internal random access memory （RAM） and syn- chronous dynamic random access memory （SDRAM） ping-pong operation, the data can be cached. The working efficiency is greatly improved. Secondly, this method could realize both the direct code stream transmission and the transmission after storage. And through the error correction coding, the correction ability of the flash memory is greatly improved. Lastly, to verify the method, the compression and de- compression circuit board are involved to specify the performance of the method. The results show that the compression system realizes real-time and stable operation,the system could achieve extremely high compression ratio by setting the software,and the average peak signal-to-noise ratio （PSNR） is 28. 238 dB and 26. 165 dB when the compression ratio is 80 ： 1 and 150 ： 1 ,respectively. With large amount of data, the compression system could be realized and the real-time performance is good enough.

关 键 词：可见光相机 Custom-specific工作模式 乒乓操作 纠错编码 

分 类 号：TN201[电子电信—物理电子学] TN911.73