Based on the Rate-Distortion rule, it is found that the fractal coding is for subtree,while the non-coding is for zerotree, and arithmetic coding is for the use of the rest part.

• 利用率失真原则找出适合于分形编码的小波树，对其进行分形编码；而对于零树不作编码；其余部分进行算术编码。