Three high frequency parts from wavelet transforms are turned into spherical coordinate, in which it applies the method to image de noising by the wavelet shrinkage parameters based on statistical characteristics.

• 该方法把线性小波变换后得到的 3个高频分量通过球坐标变换后 ；得到球坐标下 3个分量 ；然后在球坐标中根据图像统计特性设定的收缩因子处理小波收缩去噪 .