EZW，如多级树集合分裂算法(SPIHT),集合分裂嵌入块编码(SPECK),可逆的嵌入小波压缩法(CREW)等.本文对这些算法从原理到性能进行了比较和讨论,说明了嵌入式图象编码的研究方-EZW, such as multi-level collection of split tree algorithm (SPIHT), set to split the embedded block coding (SPECK), reversible embedded wavelet compression method (CREW) and so on. In this paper, these algorithms from the principle to the performance are compared and discussed to illustrate the embedded Study type image coding side