Firstly, the image is discrete wavelet transformed,then the noise is removed by soft-threshold method,and at last we compress and code it by using zerotree method.

• 首先对图像进行离散小波变换，然后对其小波变换域系数采用软阈值收缩方法实现去噪，最后利用零树方法对其进行压缩编码。