How to Set Up OpenCV 2.4 with MinGW on Windows 7?

OpenCV 2.4 and MinGW Setup on Windows 7

To utilize OpenCV 2.4 with MinGW on Windows 7, follow these steps:

OpenCV Installation:

1. Download OpenCV 2.4.3 from its official location.
2. Unzip it into a preferred directory, for instance, "C:opencv".
3. Configure your system path to include "C:opencvbuildx86mingwbin", as it contains indispensable OpenCV DLLs.

MinGW Installation:

1. Obtain the MinGW installer from its website and run it.
2. Select an installation directory, such as "C:MinGW".
3. Choose to install "C Compiler" and "C Compiler".
4. Add "C:MinGWbin" to your system path.

Sample Program:

1. Create a new 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;
}

2. Compile the code using the following command, replacing the library paths accordingly:

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

3. Run the compiled program by typing "loadimg".

You'll now have a working OpenCV and MinGW setup on Windows 7. Explore OpenCV's samples directory for further examples and documentation.

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