/// <summary>
/// Performs Leptonica Otsu adaptive image thresholding using
/// <see cref="Net.Sourceforge.Lept4j.Leptonica.PixOtsuAdaptiveThreshold(Tesseract.Pix, int, int, int, int, float, Com.Sun.Jna.Ptr.PointerByReference, Com.Sun.Jna.Ptr.PointerByReference)
/// "/>
/// method.
/// </summary>
/// <param name="pix">
///
/// <see cref="Tesseract.Pix"/>
/// object to be processed
/// </param>
/// <returns>
///
/// <see cref="Tesseract.Pix"/>
/// object after thresholding
/// </returns>
internal static Pix OtsuImageThresholding(Pix pix)
{
if (pix != null)
{
Pix thresholdPix = null;
if (pix.Depth == 8)
{
thresholdPix = pix.BinarizeOtsuAdaptiveThreshold(pix.Width, pix.Height, 0, 0, 0);
if (thresholdPix != null && thresholdPix.Width > 0 && thresholdPix.Height > 0)
{
DestroyPix(pix);
return(thresholdPix);
}
else
{
LogManager.GetLogger(typeof(TesseractOcrUtil))
.Info(MessageFormatUtil.Format(Tesseract4LogMessageConstant.CANNOT_BINARIZE_IMAGE, pix.Depth));
DestroyPix(thresholdPix);
return(pix);
}
}
else
{
LogManager.GetLogger(typeof(TesseractOcrUtil))
.Info(MessageFormatUtil.Format(Tesseract4LogMessageConstant.CANNOT_BINARIZE_IMAGE, pix.Depth));
return(pix);
}
}
else
{
return(pix);
}
}
public override Pix Handle(Pix request)
{
request = request?.BinarizeOtsuAdaptiveThreshold(this.SizeX, this.SizeY, this.SmoothX, this.SmoothY, this.ScoreFraction);
return(base.Handle(request));
}
public static void Capture(IntPtr handle, Point pos, Size size, ref OCRCapture ocrCapture, bool debug = false)
{
if (handle == IntPtr.Zero)
{
return;
}
Bitmap b = CaptureWindowArea(handle, pos, size);
if (b == null)
{
return;
}
if (debug)
{
Directory.CreateDirectory(Application.StartupPath + @"\debug");
}
if (debug)
{
b.Save(Application.StartupPath + @"\debug\00_input.png");
}
using (Pix pixc = PixConverter.ToPix(b)) {
b.Dispose();
using (Pix pixg = pixc.ConvertRGBToGray(0, 0, 0)) {
if (debug)
{
pixg.Save(Application.StartupPath + @"\debug\01_grayscale.png");
}
using (Pix pixs = pixg.ScaleGrayLI(Config.OCRScaleFactor, Config.OCRScaleFactor)) {
if (debug)
{
pixs.Save(Application.StartupPath + @"\debug\02_scale.png");
}
//pix = pix.UnsharpMaskingGray(5, 2.5f); //issues with light text on light bg
using (Pix pixb = pixs.BinarizeOtsuAdaptiveThreshold(2000, 2000, 0, 0, 0.0f)) {
if (debug)
{
pixb.Save(Application.StartupPath + @"\debug\03_binarize.png");
}
float pixAvg = pixb.AverageOnLine(0, 0, pixb.Width - 1, 0, 1);
pixAvg += pixb.AverageOnLine(0, pixb.Height - 1, pixb.Width - 1, pixb.Height - 1, 1);
pixAvg += pixb.AverageOnLine(0, 0, 0, pixb.Height - 1, 1);
pixAvg += pixb.AverageOnLine(pixb.Width - 1, 0, pixb.Width - 1, pixb.Height - 1, 1);
pixAvg /= 4.0f;
using (Pix pixi = pixAvg > 0.5f ? pixb.Invert() : pixb) {
if (debug)
{
pixi.Save(Application.StartupPath + $@"\debug\04_invert_{pixAvg > 0.5f}.png");
}
using (Pix pixn = pixi.SelectBySize(Config.OCRNoiseSize, Config.OCRNoiseSize, Config.OCRNoiseConnectivity, Config.OCRNoiseType, Config.OCRNoiseRelation)) {
if (debug)
{
pixn.Save(Application.StartupPath + @"\debug\05_removenoise.png");
}
//pixn.ClipToForeground(IntPtr.Zero);
using (Pix pix = pixn.AddBorder(Config.OCRPadding, 0)) {
if (debug)
{
pix.Save(Application.StartupPath + @"\debug\06_border.png");
}
pix.XRes = 300;
pix.YRes = 300;
using (Page page = Engine.Process(pix, PageSegMode.SingleLine)) {
ocrCapture.Text = page.GetText().Trim();
ocrCapture.Confidence = page.GetMeanConfidence();
ocrCapture.Iterations++;
if (ocrCapture.Confidence >= Config.OCRMinimumConfidence)
{
if (decimal.TryParse(ocrCapture.Text, System.Globalization.NumberStyles.Any, System.Globalization.CultureInfo.InvariantCulture, out decimal cooldown))
{
if (cooldown < Config.CooldownMaxPossible)
{
ocrCapture.Cooldown = cooldown;
}
}
}
}
}
}
}
}
}
}
}
}
