基于软件DSMs网络系统的机载SAR图像并行处理的研究

摘要

Beacuse the memory of single-Personal-Computer is limited,in general,the process of SAR remote sensing image is carried out with L/O function to read&write diskette file randomly,image processing would consume a great deal of time. And this is hard to meet the need of practical application.The Software Distributed Shared Memory Systems JIAJIA can connect memories of multiple Personal-Computers to form a large shared space,which realized the rapid process of remote sensing image with multiple Personal-Computers synchronously and conveniently. After analysizing the methods of image filter,image registration and image classification,we have developed a parallel image process system. A series of experiments have been carried out on eight PCs (Linux Operation System) by a 100Mbps switched Ethernet.Each PC has a 400MHz Pentium H processor and 256MB memory. In all evaluations,it has achieved super-linear speedups.%雷达遥感图像的处理，由于受单机内存空间的限制，一般采用I/O函数随机访问磁盘图像文件的方式，因此完成整幅图像的处理需要耗费大量的时间，很难达到实际应用的需要。基于分布式共享内存网络系统JIAJIA软件将多台微机的物理内存连接构成一个较大的共享内存空间，实现了多台微机对遥感图像同步、方便、快捷的处理。通过对SAR图像几何纠正、图像滤波、监督分类串行算法的分析，发展了相应的并行处理算法，并在8台运行Linux操作系统，主频400MHz，内存256兆的PentiumⅡPC机上进行了实验，都获得了超线性加速比的实验结果。