public override void FindCalibrationPoints()
{
Points = new List<CalibrationPoint>();
// 1) Binarize image
BinarizeImage();
// 2) Find all black dots:
// - find black pixel
// - add to list all adjacent black points
// - add this list to dot list
_dots = new List<CalibrationDot>();
for(int y = 0; y < Image.RowCount; y++)
{
for(int x = 0; x < Image.ColumnCount; x++)
{
// Check if point is black
if(Image[y, x] > 0)
{
if(CheckIfPointIsAlreadyInDot(y, x))
continue;
// Point is not in any dot, so create new one and add all linked points ( with flood fill alg.)
CalibrationDot newdot = new CalibrationDot();
FloodSearchForDotPoints(ref newdot, y, x);
_dots.Add(newdot);
// Move to right side of the dot
x = (int)(newdot.BoundingBox.X + newdot.BoundingBox.Width);
}
}
}
// 3) For each dot compute gravity center -> it's calibration point!
foreach(CalibrationDot dot in _dots)
{
dot.FindCenter();
Points.Add(new CalibrationPoint()
{
ImgX = (double)dot.Center.X,
ImgY = (double)dot.Center.Y
});
}
}
// Search for all adjacent black points using algorithm similar to flood fill:
// - after meeting black point it is added to dot points and its color is changed to white
// - same is repeated for adjacent points
private void FloodSearchForDotPoints(ref CalibrationDot dot, int y, int x)
{
if(y < 0 || y >= Image.RowCount || x < 0 || x >= Image.ColumnCount)
return;
if(Image[y, x] > 0.5f)
{
dot.AddPoint(new Point(x, y));
Image[y, x] = 0.0f;
FloodSearchForDotPoints(ref dot, y - 1, x);
FloodSearchForDotPoints(ref dot, y + 1, x);
FloodSearchForDotPoints(ref dot, y, x - 1);
FloodSearchForDotPoints(ref dot, y, x + 1);
}
}
