中文说明：lzw lzw-78 lzw-77 三种算法 图像压缩编解码，为了加快速度，取原始图像的小图，这是这个代码的重要创新。算法部分用C语言实现，能方便移植到项目中，希望对大家有用。
English Description：
LZW LZW-78 LZW-77 three algorithms of image compression coding and decoding, in order to accelerate the speed of raw image thumbnails, this is an important innovation of this code. Algorithm using c language implementation can be easily transplanted to the project, and hope to help all of us.