该程序实例首先对二维图像进行提升小波分解，然后构造传统小波分解结构[c,s]，接着使用函数ddencmp()获取信号压缩阈值，再采用函数wdencmp()实现图像压缩-First,the program decomposes the image use lifting wavelet , and then construct the traditional wavelet decomposition structure [c, s], then use the function ddencmp ()to obtain signal compression threshold, and then use the function wdencmp () to achieve image compression