Mat數據類型和通道對應的type()：

庫類型	C1	C2	C3	C4
CV_8U	0	8	16	24
CV_8S	1	9	17	25
CV_16U	2	10	18	26
CV_16S	3	11	19	27
CV_32S	4	12	20	28
CV_32F	5	13	21	29
CV_64F	6	14	22	30

通過c++程序查看類型并讀取圖像像素點：

switch (im->type()){case 0:std::cout << "at (" << x << ", " << y << " ) value is: " << static_cast<int>(im->at<uchar>(cv::Point(x, y))) << std::endl; break;case 1:std::cout << "at (" << x << ", " << y << " ) value is: " << static_cast<int>(im->at<char>(cv::Point(x, y))) << std::endl; break;case 2:std::cout << "at (" << x << ", " << y << " ) value is: " << static_cast<int>(im->at<ushort>(cv::Point(x, y))) << std::endl; break;case 3:std::cout << "at (" << x << ", " << y << " ) value is: " << static_cast<int>(im->at<short>(cv::Point(x, y))) << std::endl; break;case 4:std::cout << "at (" << x << ", " << y << " ) value is: " << static_cast<int>(im->at<int>(cv::Point(x, y))) << std::endl; break;case 5:std::cout << "at (" << x << ", " << y << " ) value is: " << static_cast<int>(im->at<float>(cv::Point(x, y))) << std::endl; break;case 6:std::cout << "at (" << x << ", " << y << " ) value is: " << static_cast<int>(im->at<double>(cv::Point(x, y))) << std::endl; break;case 16:std::cout << "at (" << x << ", " << y << " ) value is: " << static_cast<int>(im->ptr<uchar>(y)[x * 3]) << "," << static_cast<int>(im->ptr<uchar>(y)[x * 3 + 1]) << "," << static_cast<int>(im->ptr<uchar>(y)[x * 3 + 2]) << std::endl; break;case 17:std::cout << "at (" << x << ", " << y << " ) value is: " << static_cast<int>(im->ptr<char>(y)[x * 3]) << "," << static_cast<int>(im->ptr<char>(y)[x * 3 + 1]) << "," << static_cast<int>(im->ptr<char>(y)[x * 3 + 2]) << std::endl; break;case 18:std::cout << "at (" << x << ", " << y << " ) value is: " << static_cast<int>(im->ptr<ushort>(y)[x * 3]) << "," << static_cast<int>(im->ptr<ushort>(y)[x * 3 + 1]) << "," << static_cast<int>(im->ptr<ushort>(y)[x * 3 + 2]) << std::endl; break;case 19:std::cout << "at (" << x << ", " << y << " ) value is: " << static_cast<int>(im->ptr<short>(y)[x * 3]) << "," << static_cast<int>(im->ptr<short>(y)[x * 3 + 1]) << "," << static_cast<int>(im->ptr<short>(y)[x * 3 + 2]) << std::endl; break;case 20:std::cout << "at (" << x << ", " << y << " ) value is: " << static_cast<int>(im->ptr<int>(y)[x * 3]) << "," << static_cast<int>(im->ptr<int>(y)[x * 3 + 1]) << "," << static_cast<int>(im->ptr<int>(y)[x * 3 + 2]) << std::endl; break;case 21:std::cout << "at (" << x << ", " << y << " ) value is: " << static_cast<int>(im->ptr<float>(y)[x * 3]) << "," << static_cast<int>(im->ptr<float>(y)[x * 3 + 1]) << "," << static_cast<int>(im->ptr<float>(y)[x * 3 + 2]) << std::endl; break;case 22:std::cout << "at (" << x << ", " << y << " ) value is: " << static_cast<int>(im->ptr<double>(y)[x * 3]) << "," << static_cast<int>(im->ptr<double>(y)[x * 3 + 1]) << "," << static_cast<int>(im->ptr<double>(y)[x * 3 + 2]) << std::endl; break;}break;