采用四叉树编码进行二值图的压缩，四叉树编码方法是目前图象处理和计算机图形学中的一种有效方法。(Quadtree coding is currently a valuable method in image processing and computer graphics,this code is about binary image compression.)

与四叉树编码一体，是解压过程。采用十进制Morton码进行解压，程序附有注释，适合学习。程序包括四叉树编码及解码的。(Quadtree decoding,a process of unpacking,includes Decimal Morton code.The program is annotated in detail.)