摘要
信息技术和传感器技术的飞速发展,使得遥感图像的数据量呈几何级数的递增.当浏览图像或缩放时传统的方法速度都比较慢,特别是缩小图像时要读取整个影像数据,而且还要间隔的抽取数据,速度之慢几乎难以忍受,当对影像数据进行数据矢量化的时候,工作效率就非常低.本文提出了一种在打开文件时花出一定时间对影像文件进行临时文件重建,做成倒金字分层结构,并通过内存映射文件读取数据,简化了文件读取操作.这样每次浏览或缩放图像时就可以无等待了.
The rapid development of information technology and sensor technology has given rise to the geometrically progressive in the case of remote sensing data. When images are scanned or images are zoomed, traditional method is very stow, especially when all images are zoomed, all images are read, images are got at intervals, whose slow speed is oppressive, and when the images are vectored, work efficiency is very low. This paper puts forward a project that it takes much time to rebuild image document, to make it pyramid structure, and to read the images through storage mapping file technique, so it is very simple. Thus, it is not necessary to wait when the images are scanned or zoomed.
出处
《华东交通大学学报》
2007年第4期64-66,100,共4页
Journal of East China Jiaotong University
