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 << "Cannot open image!" << endl;
       return -1;
     }
   
     imshow("image", im);
     waitKey(0);
   
     return 0;
   }

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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