图像存储与实时显示系统设计与实现  

Design and implement of image storage and real time display system

作　　者：刘岩俊[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,长春130033

出　　处：《电子测量技术》2015年第5期45-49,共5页Electronic Measurement Technology

基　　金：国家863计划(2009AA8080603)资助项目

摘　　要：针对大面阵CCD摄像机需要实时无压缩记录的要求,在分析了数字视频的信号特点和SCSI系统数据传输过程的基础上,提出了利用FPGA将图像数据分路处理:一路原始图像数据经SCSI控制器以DMA方式直接写入SCSI磁盘阵列;另一路图像数据经过FPGA处理后由PCI接口进入计算机内存实时显示的设计方案。直接访问磁盘空间的存储方案指出了传统存储方案的不足,使用DMA技术解决该问题。并分析了SCSI磁盘存储时间,以及数据块大小对磁盘存储速度的影响。由于原始图像数据没有使用PCI接口,而是直接访问SCSI磁盘,其存储速度得到了很大提高,达到高速存储目的。实验结果表明,使用改进的存储方式,在输入图像分辨率为2K×2K,工作频率为25f/s时,SCSI速度存储速度达到1 200 Mb/s,存储系统工作稳定,可靠,很好地满足工程需求。In order to meet the storage speed of real time none compressed large area CCD camera, after analysis the character of digital signal and SCSI data transmission procedure, a method is presented which produce two image data by using FPGA, one of image data are written to SCSIdisk array on DMA mode by SCSIcontroller, the other image data are send to memory by PCI interface and real-time display. The insufficient of traditional storage scheme is pointed, and the DMA technology solves this question. The access time of SCSI disk and the effect of storage speed by size of data block are analysis. Because of the nature image data don＇ t pass the PCI interface the storage speed improves very much, this method meets the requirement of large capacity image record and real-time display. Experiments results show that the system works under by a 2KX2K image with 25 f/s, the storage speed reaches 1 200 Mb/s, the system works stable and correct results make this method very ascendant in practical application.

关 键 词：信息光学 无压缩存储 SCSI磁盘阵列 RAID0 实时显示 

分 类 号：TN915[电子电信—通信与信息系统]