实现对一幅灰度和彩色图像作的离散余弦变换,选择适当的DCT系数阈值对其进行DCT反变换.-The realization of a piece of gray and color images for the discrete cosine transform, select the appropriate thresholds for DCT coefficients of its inverse transform DCT.

JPEG压缩全过程，压缩和解压缩,改程序是编写静止图像必须学习得程序，内容丰富，需要耐心学习，先搞懂图像压缩的过程，包括颜色空间转换，DCT变换，Huffman编码，量化等过程-JPEG compression and decompression