OpenCV Hello World

helloworld.cpp

#include <opencv2/opencv.hpp>

int main () {
  cvNamedWindow( "My Window", 1 );
  IplImage *img = cvCreateImage( cvSize( 640, 480 ), IPL_DEPTH_8U, 1 );
  CvFont font;
  double hScale = 2.0;
  double vScale = 2.0;
  int lineWidth = 5;
  cvInitFont(&font, CV_FONT_HERSHEY_SIMPLEX | CV_FONT_ITALIC, hScale, vScale, 0, lineWidth);
  cvPutText(img, "Hello World!", cvPoint( 100, 200 ), &font, cvScalar( 255, 255, 0 ) );
  cvShowImage( "My Window", img );
  cvWaitKey();
  return 0;
}