private void ProcessImage(Bitmap image) {
CaptchaImageProcessor proc = new CaptchaImageProcessor(image);
ImageProcessorSettings settings = new ImageProcessorSettings() {
ImageBlur = chkBlur.Checked,
RemoveBorder = (int)numericRemoveBorder.Value,
RemovePixelNoise = (int)numericNoiseKill.Value,
InvertColors = chkInvertColors.Checked,
LinearizeColors = chkLinarizeColors.Checked,
BrightnessThreshold = (int)numericBrightness.Value
};
Bitmap imageAfter = proc.ProcessImage(settings);
string result = CaptchaKiller.OCR(imageAfter);
imgAfter.Image = imageAfter;
if (result == null) {
lblResult.BackColor = Color.Maroon;
lblResult.ForeColor = Color.WhiteSmoke;
lblResult.Text = "OCR Error";
} else {
lblResult.BackColor = Color.DarkGreen;
lblResult.ForeColor = Color.WhiteSmoke;
lblResult.Text = result;
}
}
public Bitmap ProcessImage(ImageProcessorSettings settings)
{
Bitmap output = Image.Clone() as Bitmap;
if (settings.RemoveBorder > 0)
{
int x = settings.RemoveBorder;
output = new Crop(new Rectangle(x, x, Image.Width - (2 * x), Image.Height - (2 * x))).Apply(Image);
}
if (settings.RemovePixelNoise > 0)
{
for (int i = 0; i < settings.RemovePixelNoise; i++)
{
// Use a copy for iteration
Bitmap bitmap = new Bitmap(output);
for (int j = 1; j < (output.Height - 1); j++)
{
for (int k = 1; k < (output.Width - 1); k++)
{
if (output.GetPixel(k, j).GetBrightness() < 0.5)
{
// Top left
float tl = output.GetPixel(k - 1, j).GetBrightness();
// Top right
float tr = output.GetPixel(k + 1, j).GetBrightness();
// Bottom left
float bl = output.GetPixel(k, j - 1).GetBrightness();
// Bottom right
float br = output.GetPixel(k, j + 1).GetBrightness();
// Test the edges
if (tl > 0.5 && tr > 0.5)
{
bitmap.SetPixel(k, j, Color.White);
}
if (bl > 0.5 && br > 0.5)
{
bitmap.SetPixel(k, j, Color.White);
}
}
}
}
output = bitmap;
}
}
if (settings.LinearizeColors)
{
ImageStatistics statistics = new ImageStatistics(output);
output = new LevelsLinear {
InRed = new Range(statistics.Red.Min, statistics.Red.Max),
InGreen = new Range(statistics.Green.Min, statistics.Green.Max),
InBlue = new Range(statistics.Blue.Min, statistics.Blue.Max)
}.Apply(output);
}
if (settings.InvertColors)
{
output = new Invert().Apply(output);
}
if (settings.ImageBlur)
{
output = new Blur().Apply(output);
}
if (settings.BrightnessThreshold > 0)
{
// Brightness threshold is in percent..
decimal threshold = (decimal)settings.BrightnessThreshold / 100M;
output = new Threshold(Convert.ToByte((decimal)(threshold * 255M)), 255).Apply(output);
}
return(output);
}
