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#include "opencv2/core.hpp" #include "opencv2/imgproc.hpp" #include "opencv2/highgui.hpp" #include <iostream> using namespace cv; using namespace std; int main() { Mat mat_src = Mat::eye(3, 4, CV_8UC1); cout << "mat_src :" << endl; cout << mat_src << endl; cout << endl; cout << "Rows : " << mat_src.rows << endl; cout << "Cols : " << mat_src.cols << endl; //注: mat_src.at<float>(y, x), 下标关系为: y-x mat_src.at<float>(0, 2) = 2; mat_src.at<float>(2, 0) = 4; cout << endl; cout << "mat_src :" << endl; cout << mat_src << endl; return 0; }