public Bitmap Binarization(BitImage bmp)
{
var result = new Bitmap(bmp.Width, bmp.Height);
for (var x = 0; x < result.Width; x++)
{
for (var y = 0; y < result.Height; y++)
{
var color = bmp.PixelArray[x, y];
result.SetPixel(x, y, color <= 120 ? Color.Black : Color.White);
}
}
return result;
}
public Bitmap Binarization(BitImage bmp)
{
var result = new Bitmap(bmp.Width, bmp.Height);
for (var i = 0; i < bmp.Width; i++)
{
for (var j = 0; j < bmp.Height; j++)
{
var pixel = bmp.PixelArray[i, j];
var pixelIntensity = SurroundedValue(i, j, bmp);
result.SetPixel(i, j, pixel > pixelIntensity - 5 ? Color.White : Color.Black);
}
}
return result;
}
private byte SurroundedValue(int x, int y, BitImage bmp)
{
const int radius = 20;
var left = (x - radius < 0) ? 0 : x - radius;
var top = (y - radius < 0) ? 0 : y - radius;
var right = (x + radius < bmp.Width) ? x + radius : bmp.Width - 1;
var bottom = (y + radius < bmp.Height) ? y + radius : bmp.Height - 1;
var summaryIntensity = 0;
var counter = 0;
for (var i = left; i <= right; i++)
{
for (var j = top; j <= bottom; j++)
{
summaryIntensity += bmp.PixelArray[i, j];
counter++;
}
}
return (byte)(summaryIntensity / counter);
}
