How to Get Started with OpenCV 2.4 on Windows 7 Using MinGW?

Getting Started with OpenCV 2.4 and MinGW on Windows 7

Installation:

1. OpenCV 2.4.3:

   • Extract the OpenCV self-extracting file to a directory (e.g., C:).
   • Add the OpenCV DLL directory (C:opencvbuildx86mingwbin) to your system path.

2. MinGW Compiler Suite:

   • Install MinGW and select the "C Compiler" and "C Compiler" options.
   • Add the MinGW bin directory (C:MinGWbin) to your system path.

Sample Code:

Create a file named loadimg.cpp with the following code:

#include "opencv2/highgui/highgui.hpp"
#include <iostream>

using namespace cv;
using namespace std;

int main(int argc, char** argv)
{
  Mat im = imread(argc == 2 ? argv[1] : "lena.jpg", 1);
  if (im.empty())
  {
    cout << "Cannot open image!" << endl;
    return -1;
  }

  imshow("image", im);
  waitKey(0);

  return 0;
}

Compilation and Execution:

1. Compile the code using the command:

   g++ -I"C:\opencv\build\include" -L"C:\opencv\build\x86\mingw\lib" loadimg.cpp -lopencv_core243 -lopencv_highgui243 -o loadimg

2. Execute the program:

   loadimg

This will display the loaded image in a window.

Next Steps:

• Explore the OpenCV samples directory (C:opencvsamplescpp).
• Compile and study existing code.
• Develop your own OpenCV applications.

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