// Done!
private static void FindEdgesHelper(UnsafeBitmap source, UnsafeBitmap destination, int x, int y, Color pixel, Color edge, Rectangle area, float threshold)
{
int sy = y - 1;
int sx = x - 1;
int yl = y + 1;
int xl = x + 1;
for (int i = sy; i <= yl; ++i)
{
for (int k = sx; k <= xl; ++k)
{
if (k == i)
{
continue;
}
if (IsValid(k, i, area.Width, area.Height) == false)
{
continue;
}
PixelData temp = source.GetPixel(k, i);
int dr = temp.Red - pixel.R;
int dg = temp.Green - pixel.G;
int db = temp.Blue - pixel.B;
var distance = Math.Sqrt((dr * dr) + (dg * dg) + (db * db));
if (distance > threshold)
{
destination.SetPixel(x, y, edge);
return;
}
}
}
destination.SetPixel(x, y, Color.White);
}
// Done!
private static Color[] GetNeighbours(UnsafeBitmap source, int x, int y)
{
const int offset = 1;
int sy = y - offset;
int sx = x - offset;
int yl = y + offset;
int xl = x + offset;
Color[] pixelData = new Color[9];
int counter = 0;
for (int i = sy; i <= yl; ++i)
{
for (int k = sx; k <= xl; ++k)
{
pixelData[counter++] = IsValid(k, i, Area.Width, Area.Height) == false ? EmptyColor : (Color)source.GetPixel(k, i);
}
}
return(pixelData);
}