人脸马赛克

CascadeClassifier cpufaceCascade;
    const string path = "../data/haarcascade_frontalface_alt.xml";
    if (!cpufaceCascade.load(path))
    {
        cout << "找不到级联器";
        return -1;
    }
    Mat img = imread("../data/facetest.jpg", IMREAD_REDUCED_COLOR_8);
    if (img.empty())
    {
        cout << "没有照片";
        return 1;
    }
    Mat imgGray;
    vector<Rect> faces;
    cpufaceCascade.detectMultiScale(img, faces, 1.1,1,5);
    blur(img, imgGray,Size(20,20),Point(-1,-1),4);
    cout << faces.size();
    if (faces.size() > 0)
    {
        for (int i = 0; i < faces.size(); i++)
        {
            if (img.channels() == 3) {
            
                for (int K = faces[i].x; K < faces[i].x + faces[i].height ; K++)
                {

                    for (int J = faces[i].y; J < faces[i].y+ faces[i].width; J++)
                    {

                        img.at<Vec3b>(J, K) = imgGray.at<Vec3b>(J, K);
                      
                    }
                }
            }
        }
    }

    //获取一张就这些保留其他全黑的图片
    namedWindow("a", WINDOW_AUTOSIZE); // 创建一个窗口
    imshow("a", img);
    waitKey(0);
    destroyAllWindows();
    return 0;