FreeBSD 开发者手册(pdf)，全面的系统级编程指南，热爱BSD unix的朋友不可错过。也可在其官方镜像下载其他格式。-FreeBSD developers manual (pdf), a comprehensive guide to system-level programming, love BSD unix friends not to be missed. Also available on its official download the image format.

Optimized Median Lifting Scheme for Lossy Image Compression