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

Getting Started with OpenCV 2.4 and MinGW on Windows 7

Installing OpenCV 2.4.3

To install OpenCV 2.4.3, extract the downloaded file to a directory like "C:." This will create a "C:opencv" directory containing header files, libraries, and code samples. Add the directory "C:opencvbuildx86mingwbin" to your system path to access the OpenCV DLLs.

Installing MinGW Compiler Suite

Install the MinGW compiler suite and select the "C Compiler" and "C Compiler" components. Add the directory "C:MinGWbin" to your system path to ensure MinGW availability.

Writing a Sample Code

In loadimg.cpp, include OpenCV headers and 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;
}

Compiling and Running the Code

Compile the code using:

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

Execute the resulting loadimg.exe to display the OpenCV logo window.

Next Steps

Explore the OpenCV samples at "C:opencvsamplescpp" to enhance your knowledge and start developing your own OpenCV applications.

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