opencv掩模操作

    //设置变量，读图
    Mat image, mask;
    Mat img1, img2, img3, img4;
    image = imread("data/img/1.jpg");

    //设置掩模
    mask = Mat::zeros(image.size(), CV_8UC1);
    Rect r1(100, 100, 250, 300);
    mask(r1).setTo(255);

    //取img123及mask
    img1 = image(r1);//取image中r1区域，“抠出来”
    image.copyTo(img2, mask);//把image复制进预定掩模，进行与
    image.copyTo(img3);
    img3.setTo(0, mask);//把掩img3在模中1中的区域置0，“抠出去”

    //显示
    imshow("Image sequence", image);
    imshow("img1", img1);
    imshow("img2", img2);
    imshow("img3", img3);
    imshow("mask", mask);

    waitKey();
    return 0;