压缩(Compression)：压缩是制作数字电影的一个重要感念。视频和音频在数字化过程中都可以通过电脑进行压缩。当声音和画面被压缩后，他们可以更高效的得到CPU的处理并减少视频及音频文件占用的硬盘空间。压缩也是视频在网络上传播的关键，必须将文件大小压缩至带宽允许的程度才可以被用户下载。
sphit algorithm is used in this code to describe image compression
·期刊论文：Robust SPIHT-based Image Compression
this the source code of audio compression standard, ADPCM-64/G.722.
Data compression using a word-based model and revised arithmetic coding method.
JPEG2000相关文档《The JPEG-2000 Still Image Compression Standard》
Context-based adaptive binary arithmetic coding in the H.264AVC video compression
Compression using lempel-ziv -for a dictionary size of 2k -provide dictionary Lempel ziv algorith...
John Wiley & Sons - JPEG2000 Standard for Image Compression Concepts Algorithms and VLSI Architectures 2005
Context-based adaptive binary arithmetic coding in the H.264AVC video compression standard
IMAGE and VIDEO COMPRESSION for MULTIMEDIA ENGINEERING Fundamentals, Algorithms, and Standards,by Yun Q. Shi