1.用纯白图像-原图
Mat img = imread(path); imshow("src", img); waitKey(); Mat white = cv::Mat(250,250,CV_8UC3,Scalar(255,255,255)); imshow("white", white); waitKey(); Mat dst = white - img; imshow("dst", dst); waitKey();
原文：https://www.cnblogs.com/lx17746071609/p/12714701.html