public static Bitmap ThresholdingWithGrayScaleLevel(Bitmap bmp, int p1, int p2)
{
var grayscale = BitmapHelper.ToGrayscale(bmp);
for (int x = 0; x < grayscale.Width; x++)
{
for (int y = 0; y < grayscale.Height; y++)
{
if (grayscale.GetPixel(x, y).R <= p1 || grayscale.GetPixel(x, y).R >= p2)
{
grayscale.SetPixel(x, y, Color.FromArgb(0, 0, 0, 0));
}
}
}
return(grayscale);
}
public static Bitmap Rozciaganie(Bitmap b, int p1, int p2)
{
var bmp = BitmapHelper.ToGrayscale(b);
for (int x = 0; x < bmp.Width; x++)
{
for (int y = 0; y < bmp.Height; y++)
//if (p1 < p2)
{
if (bmp.GetPixel(x, y).R > p1 && bmp.GetPixel(x, y).R <= p2)
{
var av = ((bmp.GetPixel(x, y).R - p1) * ((256 - 1) / (p2 - p1)));
bmp.SetPixel(x, y, Color.FromArgb(bmp.GetPixel(x, y).A, av, av, av));
}
}
}
//else bmp[x, y] = 0;
return(bmp);
}
public static Bitmap Thresholding(Bitmap bmp, int value)
{
var grayscale = BitmapHelper.ToGrayscale(bmp);
for (int x = 0; x < grayscale.Width; x++)
{
for (int y = 0; y < grayscale.Height; y++)
{
if (grayscale.GetPixel(x, y).R <= value)
{
grayscale.SetPixel(x, y, Color.FromArgb(0, 0, 0, 0));
}
else
{
grayscale.SetPixel(x, y, Color.FromArgb(255, 255, 255, 255));
}
}
}
return(grayscale);
}