利用小波变换实现图像压缩：



利用小波变换实现图像压缩，是利用小波分解图像的高频部分，只保留低频部分，

从图中可以看出，第一次压缩是提取图像中小波分解的第一层低频信息，此时压缩效果较好,第二次压缩是提取第二层的低频部分，其压缩效果远不如第一次压

-Using wavelet transform image compression: wavelet transform for image compression, is the use of high-frequency part of the wavelet decomposition of the image, leaving only the low-frequency part,　can be seen from the figure, the first is to extract the compressed image wavelet decomposition first layer low-frequency information, when the compression is better, the second compression is to extract the low frequency part of the second layer, which is far better than the first compression pressure