// CPP program to demonstrate segmentation // thresholding. #include  #include  #include  #include  using namespace cv; int main(int argc char** argv) {  if (argc != 2)   {  cout << ' Usage: '  '   ' << endl;  return -1;  }  int threshold_value = 0;  // Valid Values: 0 1 2 3 4  int threshold_type = 2;   // maxVal useful for threshold_type 1 and 2  int maxVal = 255;   // Source image  Mat src = imread(argv[1] 1);  cvNamedWindow('Original' CV_WINDOW_NORMAL);  imshow('Original' src);  Mat src_gray dst;  // Convert the image to GrayScale  cvtColor(src src_gray CV_BGR2GRAY);  // Create a window to display results  cvNamedWindow('Result' CV_WINDOW_NORMAL);  createTrackbar('Threshold' 'Result'   &threshold_value 255);  while (1)   {  threshold(src_gray dst threshold_value   maxVal threshold_type);  imshow('Result' dst);  waitKey(1);  } }