sift的C++版，在sift上找出鲁棒性最强的几个特征点，然后以这个点为圆心，以自适应性的尺度为半径画圆，这个非常适合运用于数字水印领域，适用于抵抗数字水印的几何攻击-sift the C++ version of the robustness of the sift to find the strongest on the number of feature points, and then to this point as the center of the scale of self-a

给图片添加图片水印的代码，VS下C++编程，使用openCV2.3的新C++接口函数.含测试图片，已编译。-To the picture to add images watermarking code, VS C++ under programming, use openCV2.3 new C++ interface function. Including test images, compiled.

基于fft的数字水印，分别对RBG三个通道重复嵌水印，每个通道分别对fft变换域中幅度谱以圆方式，每个圆上对称的四个点重复嵌1bit水印，然后以r为步进，选更大的圆嵌入接下去的水印信息，该方法有比较好的鲁棒性-Fft-based digital watermarking were embedded watermark repeated RBG three channels, each channel separately the fft transform domain amplitude sp

图像隐藏和数字水印,采用在空域隐藏,在每个象素的bit位的低位藏入图片(Image hiding and digital watermarking, the use of hidden in the airspace, at each pixel bit a low inside the picture)