在网上偶然看到图像加密的内容，就想着研究研究，搞清楚到底是怎么回事。
本文主要参考博文 http://blog.csdn.net/u013626386/article/details/39736611
其为matlab实现方法，博主好好看了下，理解了其加密的原理， 然后自己用c++实现，现在记录其原理及代码。
1、生成与图片大小相对应的，具有随机性和规律性的数据。
void getEencryptListFromImageSize(Size imagesize, vector<int> &list1, vector<int> &list2, double paDou1, double paDou2, double paK) { int elementNum = imagesize.width*imagesize.height; double x1 = (paDou1 + paK) / 2; double x2 = (paDou2 + paK) / 2; //double x1 = (paDou1 ) / 2; //double x2 = (paDou2 ) / 2; double y1, y2, nowx1, nowx2; int tem, k1, k2; double lastx1 = x1; double lastx2 = x2; for (int i = 0; i < elementNum; i++) { nowx1 = 4*lastx1*(double(1)- lastx1); nowx2 = 4*lastx2*(double(1) - lastx2); y1 = (double(1) / 3.1415926)*asin(sqrt(nowx1)); y2 = (double(1) / 3.1415926)*asin(sqrt(nowx2)); tem = floor(y1*pow(10, 8)); k1 = tem % 256; tem = floor(y2*pow(10, 6)); k2 = tem % 256; list1.push_back(k1); list2.push_back(k2); lastx1 = nowx1; lastx2 = nowx2; } }2、将图像与生成的数据进行相对应的位异或计算，就得到看起来杂乱无序的加密图像。加密后的图像，想要还原时，只需再次与生成的数据进行同样的计算即可。 Mat pictureDecrypt(Mat src, vector<int> list1, vector<int> list2) { Mat dstImage = src.clone(); int loop = 0; for (int i = 0; i < src.rows; i++) { for (int j = 0; j < src.cols; j++) { int tem; if (loop % 2 == 0) { tem = list1[i*src.cols + j]; } else { tem = list2[i*src.cols + j]; } if (src.channels()==1) { int num = src.at<uchar>(i, j); int num1 = num^tem; dstImage.at<uchar>(i, j) = num1; } else if (src.channels() == 3) { int num0 = src.at<Vec3b>(i, j)[0]; int num1 = src.at<Vec3b>(i, j)[1]; int num2 = src.at<Vec3b>(i, j)[2]; int res0 = num0^tem; int res1 = num1^tem; int res2 = num2^tem; dstImage.at<Vec3b>(i, j)[0] = res0; dstImage.at<Vec3b>(i, j)[1] = res1; dstImage.at<Vec3b>(i, j)[2] = res2; } loop = loop + 1; if (loop ==925444) { cout << "" << endl; } } } return dstImage; } 3、下面展示效果源图
加密后的图像
解密后的图像
