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  1. #include <iostream>
  2. #include "opencv2\opencv.hpp"
  3.  
  4. using namespace std;
  5. using namespace cv;
  6.  
  7. int main()
  8. {
  9.     Mat a=imread("Capture.JPG",1);
  10.  
  11.     Mat b(a,Rect(0,0,30,30));
  12.  
  13.     line(b,Point(0,0),Point(30,30),Scalar(0,255,255));
  14.  
  15.     imshow("a",a);
  16.     imshow("b",b);
  17.     waitKey();
  18.     return 0;
  19. }
  20.  
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https://ideone.com/66cYm
language:
C++ (gcc 8.3)
created:
13 years ago
visibility:
public

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