/// <summary>
/// Turns a bitmap black and white
/// </summary>
/// <param name="thresh"></param>
/// <returns></returns>
public ImagePreprocessor Binarization(BinarizationThreshold thresh = BinarizationThreshold.Light)
{
try
{
// Establish a color object.
Color curColor;
int ret;
// The width of the image.
for (int iX = 0; iX < Image.Width; iX++)
{
// The height of the image.
for (int iY = 0; iY < Image.Height; iY++)
{
// Get the pixel from bitmap object.
curColor = Image.GetPixel(iX, iY);
// Transform RGB to Y (gray scale)
ret = (int)(curColor.R * 0.299 + curColor.G * 0.578 + curColor.B * 0.114);
// This is our threshold, you can change it and to try what are different.
if (ret > (int)thresh)
{
ret = 255;
}
else
{
ret = 0;
}
// Set the pixel into the bitmap object.
Image.SetPixel(iX, iY, Color.FromArgb(ret, ret, ret));
} // The closing 'The height of the image'.
} // The closing 'The width of the image'.
} catch (Exception e)
{
log.LogWarning("Binarization Failed: " + e.Message);
}
return(this);
}
public ProcessedBitmap Process(ParsedBitmap parsed, Location location, Rectangle cropLocation, BinarizationThreshold binarization = BinarizationThreshold.Light)
{
this.Url = parsed.Url;
this.Location = location;
Bitmap clone = new Bitmap(parsed.Image);
this.Image = imagePreprocessor
.SetImage(clone)
.Crop(cropLocation)
.FloodFill()
.Resize()
.AddBorder(Color.White)
.Binarization(binarization)
.Image;
return(this);
}
