该代码可以实现基于小波变换的图像融合，针对同一张图像但是当焦点不同时，两张图像会有部分地方模糊，对这两张图片融合使其变得更加清晰(This code can realize image fusion based on wavelet transform. For the same image but when the focus is different, the two images will be partially blurred, and the fusion of the two images makes it more clear)