QString appPath = QCoreApplication::applicationDirPath();imagePath = appPath + "/A.jpg";img = cv::imread(imagePath.toStdString());if (img.empty())return;Mat dst;flip(img, dst, 0);//上下翻转imshow("flip0", dst);flip(img, dst, 1);//左右翻转imshow("flip1", dst);flip(img, dst, -1);//180°旋转imshow("flip-1", dst);int h = img.rows;int w = img.cols;Mat M = getRotationMatrix2D(Point2f(w / 2, h / 2), 45, 1.0);double cos = abs(M.at<double>(0, 0));double sin = abs(M.at<double>(0, 1));int nw = cos * w + sin * h;int nh = sin * w + cos * h;M.at<double>(0, 2) = M.at<double>(0, 2) + (nw / 2 - w / 2);M.at<double>(1, 2) = M.at<double>(1, 2) + (nh / 2 - h / 2);warpAffine(img, dst, M, Size(nw,nh),INTER_LINEAR,0,Scalar(255,0,0));imshow("rotate", dst);

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