util.cpp


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#include "util.h"

float flopow(float b, float e)
{
	return (b>=0.0) ? (powf(b,e)) : (-powf(-b,e));
}

Mat circle_mat(int radius)
{
  Mat result(radius*2+1, radius*2+1, CV_8U);
  for (int x=0; x<=result.cols/2; x++)
    for (int y=0; y<=result.rows/2; y++)
    {
      unsigned char& p1 = result.at<unsigned char>(result.cols/2 + x, result.rows/2 + y);
      unsigned char& p2 = result.at<unsigned char>(result.cols/2 - x, result.rows/2 + y);
      unsigned char& p3 = result.at<unsigned char>(result.cols/2 + x, result.rows/2 - y);
      unsigned char& p4 = result.at<unsigned char>(result.cols/2 - x, result.rows/2 - y);
      
      if ( x*x + y*y < radius*radius )
        p1=p2=p3=p4=255;
      else
        p1=p2=p3=p4=0;
    }
    
  return result;
}