two little functions converting either 2d into 1d or 1d into 2d coordinates

convertCoord1d2d.cpp

cv::Point index2Coord(int index)
{
  int x = index % width;
  int y = index / width;
  return cv::Point(x,y);
}

int coord2Index(int x, int y)
{
  return x + width*y;
}