public Bitmap Convert(Bitmap bitmap, int threshold, int range)
{
var gray = new Bitmap(bitmap.Width, bitmap.Height);
var max = 3 * 255;
for (int iY = 0; iY < bitmap.Height; iY++)
{
for (int iX = 0; iX < bitmap.Width; iX++)
{
var pixel = bitmap.GetPixel(iX, iY);
//int sum = pixel.R + pixel.G + pixel.B;
int sum = ImageToGraphHelper.GrayScale(pixel);
//gray.SetPixel(iX, iY, Color.FromArgb(255, res, res, res));
//continue;
if (sum > ImageToGraphHelper.Normalize(threshold - range, max) && sum < ImageToGraphHelper.Normalize(threshold + range, max))
{
gray.SetPixel(iX, iY, Color.Black);
continue;
}
if (sum < ImageToGraphHelper.Normalize(threshold - range, max) || sum > ImageToGraphHelper.Normalize(threshold + range, max))
{
gray.SetPixel(iX, iY, Color.Gray);
continue;
}
gray.SetPixel(iX, iY, Color.White);
}
}
return(gray);
}
public DrawPointItem ScanToNextPossiblePoint(Bitmap bitmap, int iY, int iX, int threshold, int range)
{
var rad = range / 2;
if (rad == 0)
{
rad = 1;
}
var collect = new List <DrawPointItem>();
for (int iRangeY = iY - rad; iRangeY < iY + rad; iRangeY++)
{
for (int iRangeX = iX - rad; iRangeX < iX + rad; iRangeX++)
{
int targetY = iRangeY;
int targetX = iRangeX;
//bool isMinOutRangeY = false;
//bool isMaxOutRangeY = false;
//bool isMinOutRangeX = false;
//bool isMaxOutRangeX = false;
if (targetY < 0)
{
//isMinOutRangeY = true;
targetY = 0;
}
if (targetY >= bitmap.Height)
{
//isMaxOutRangeY = true;
targetY = bitmap.Height - 1;
}
if (targetX < 0)
{
//isMinOutRangeX = true;
targetX = 0;
}
if (targetX >= bitmap.Width)
{
//isMaxOutRangeX = true;
targetX = bitmap.Width - 1;
}
//if (isMinOutRangeY || isMaxOutRangeY)
//{
//}
//else
//{
// targetY = iRangeY;
//}
//if(isMinOutRangeX || isMaxOutRangeX)
//{
//}
//else
//{
// targetX = iRangeX;
//}
var t = ImageToGraphHelper.GrayScale(bitmap.GetPixel(targetX, targetY));
collect.Add(new DrawPointItem(targetX, targetY, t));
}
}
var max = collect.Min(m => m.GrayScaleValue);
if (collect.All(a => a.GrayScaleValue == max))
{
var t = ImageToGraphHelper.GrayScale(bitmap.GetPixel(iX, iY));
return(new DrawPointItem(iX, iY, t));
}
var result = collect.First(f => f.GrayScaleValue <= max);
return(result);
}
