该压缩包实现二维的DCT变换和逆DCT变换，可以对图像做DCT变换和逆DCT变换，实现非常简洁，速度很快。-the compressed 2D DCT and the inverse DCT. Images can be done DCT and inverse DCT achieve a very simple, very fast.

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 precoded SLM method for PAPR reduction High Peak to Average Power Ratio (PAPR) is still a most important challenge in Orthogonal Frequency Division Multiplexing (OFDM) system. In this paper, we propose a Discrete Cosine Transform (DCT) p