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HomeBackend DevelopmentC++How to Set Up OpenCV 2.4 and MinGW on Windows 7 for Image Processing?

How to Set Up OpenCV 2.4 and MinGW on Windows 7 for Image Processing?

Getting Started: OpenCV 2.4 and MinGW on Windows 7 with a Sample Code

Installing OpenCV 2.4

  • Download and extract the OpenCV 2.4.3 package from Sourceforge.net.
  • Install it in a directory (e.g., C:).
  • Add the OpenCV DLL directory (C:opencvbuildx86mingwbin) to your system PATH.

Installing MinGW

  • Download the MinGW installer from Sourceforge.net and follow the wizard.
  • Select the directory to install (e.g., C:MinGW).
  • Install the C Compiler and C Compiler.
  • Add the MinGW bin directory (C:MinGWbin) to your system PATH.

Writing a Sample Code

  1. Create a new C file (e.g., 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 </iostream>
  2. Compile the code:

    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 (loadimg.exe) to load and display an image.

Next Steps

  • Explore the sample codes in the OpenCV samples directory (C:opencvsamplescpp).
  • Develop your own OpenCV applications.

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