数字水印置乱变换频域插入程序，含有置乱变换与逆置乱算法，DCT运算与IDCT运算-Digital watermarking Scrambling frequency domain insertion procedure contains scrambling transformation and inverse scrambling algorithm, DCT operation and IDCT operation

dct变换，哈夫曼编码解码，量化，信源编码解码图片压缩，(DCT transform, Huffman coding and decoding, picture compression)