double형 cv::Mat의 image 출력

ri라는 double형 cv::Mat를 imshow()함수로 출력한다.

     cv::Mat mat = ri->getClone();      // ri = cv::Mat(h, w, cv::DataType<double>::type)

     std::cout << "channels : " << mat.channels() << std::endl; // 1

     std::cout << "type : " << mat.type() << std::endl;         // 6

     std::cout << "depth : " << mat.depth() << std::endl;       // 6 CV_64F

     int h = mat.rows;

     int w = mat.cols;

     double t_max = DBL_MIN;

     double t_min = DBL_MAX;

     Concurrency::parallel_for(0, h, [&](int y)

     {

           for (int x = 0; x < w; x++)

           {

                if (mat.at<double>(y, x) < 0) continue; // error 값

                if (mat.at<double>(y, x) > t_max) t_max = mat.at<double>(y, x);

                if (mat.at<double>(y, x) < t_min) t_min = mat.at<double>(y, x);

           }

     });

     double scale = 255. / (t_max - t_min);

     cv::Mat sumImage(mat.rows, mat.cols, CV_8UC3); // 3channels

     sumImage.setTo(cv::Scalar(0,200,0));

     Concurrency::parallel_for(0, h, [&](int y)

     {

           for (int x = 0; x < w; x++)

           {

                if (mat.at<double>(y, x) < 0) continue; // error 값

                unsigned char intensity = cv::saturate_cast<uchar>((mat.at<double>(y, x) - t_min) * scale);

                sumImage.at<cv::Vec3b>(y, x)[0] = intensity;

                sumImage.at<cv::Vec3b>(y, x)[1] = intensity;

                sumImage.at<cv::Vec3b>(y, x)[2] = intensity;

           }

     });

     cv::imshow("hello", sumImage);

     cv::waitKey(0);