A novel coding algorithm was presented for still ima ge using biorthogonal wavelet transform . combined with the visibility preaccentua tion before the quantization ， a new data structure named extended q _ tree was pro posed to organize wavelet transformation coefficients . experimental results show that the new algorithm is very practical and with good performance 研究了一种基于双正交小波变换的静止图象编码算法.结合带视觉加权的标量量化技术，提出了一种新的数据结构? ?扩展四叉树，从而实现了一种性能较好、复杂度较低的静止图象编码方案
