聲明:本內容轉載自https://blog.csdn.net/u010189457/article/details/71553436?utm_source=itdadao&utm_medium=referral,只爲閱讀方便。
行列與座標系對應關係
行rows:Y
列cols:X
注意!注意!注意!
在Mat類型變量訪問時下標是反着寫的,即:按照(y, x)的關係形式訪問,下面通過代碼展示來說明這一點
#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), 下標關係爲: 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;
}