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(, , , );
     mask(r1).setTo();

     //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(, 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 ;