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.

• 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。