使用C实现在DCT域嵌入水印和提取水印。对矩阵操作要求比较高-The realization of the use of C in the DCT domain watermark embedding and extraction of the watermark. Operating requirements of the matrix is relatively high

将原始载体图片经过一维冗余离散小波变换分成四个子频带，分别对每个子频带进行奇异值分解， 将水印图片灰度值直接按比例缩小嵌入到奇异值矩阵中，再将此矩阵进行一次奇异值分解得到奇异值当做此子带的奇异值， 重建此子带矩阵，而后将进行反冗余离散小波变换得到嵌入载体后的水印图像。-The original image after the one-dimensional vector redundant discrete wavelet transform is divided into four subba

Matlab实现的一种基于矩阵分解的信息隐藏代码-This code realize the function of embedding the secret information based on the matrix decomposition

nsf5隐写算法，DCT的升级版，MATLAB实现，可以抵抗一般的DCT隐写分析(The algorithm nsF5 evolved from the F5 algorithm originally proposed by Andreas Westfeld in 2001. F5 decreases the absolute value of DCT coefficients and incorporates matrix embedding - a coding scheme that de