这是一个图像增强的应该实例，首先画出原始图像，下来进行图像的增强处理，用sym4小波对x进行2层小波分解，对处理后的系数进行重构，最后画出重构图像。-This is an instance of image enhancement should first draw the original image, down to the image enhancement processing, with sym4 x for 2-layer wavelet wavelet decomposition, the coefficients of the reconstruction process after the final draw the reconstructed image.