利用子程序fast-lot.m,实现对该图像的变化及压缩，并和以为信号做dct后的图像质量相比较。-Using subroutine fast-lot.m, to achieve the changes and compression of the image, and after, and that the signals do dct compare the image quality.

DCT变换，里面很多有用的matlab程序，你会需要的哈-DCT transform, which a lot of useful matlab program, you will need to Kazakhstan