private static string GetCaptchaText(string captchaFilePath)
{
string captchaText = null;
Pix captcha = null;
try
{
captcha = Pix.LoadFromFile(captchaFilePath);
}
catch (Exception e)
{
Log.Error(e, "Error loading captcha file");
}
if (captcha != null)
{
var grayCaptcha = captcha.ConvertRGBToGray();
var binarizedCaptcha = grayCaptcha.BinarizeSauvolaTiled(10, 0.75f, 1, 2);
var engine = new TesseractEngine(Path.GetFullPath("tessdata"), "eng", EngineMode.Default);
engine.SetVariable("tessedit_char_whitelist", "ABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890");
var page = engine.Process(binarizedCaptcha, PageSegMode.SparseText);
captchaText = page.GetText();
captchaText = Regex.Replace(captchaText, @"\s+", string.Empty);
}
return(captchaText);
}
/// <summary>
/// Converts Leptonica
/// <see cref="Tesseract.Pix"/>
/// to grayscale.
/// </summary>
/// <remarks>
/// In .Net image is converted only if this is 32bpp image. In java image is
/// converted anyway using different Leptonica methods depending on
/// image depth.
/// </remarks>
/// <param name="pix">
///
/// <see cref="Tesseract.Pix"/>
/// object to be processed
/// </param>
/// <returns>
/// preprocessed
/// <see cref="Tesseract.Pix"/>
/// object
/// </returns>
internal static Pix ConvertToGrayscale(Pix pix)
{
if (pix != null)
{
int depth = pix.Depth;
if (depth == 32)
{
return(pix.ConvertRGBToGray());
}
else
{
LogManager.GetLogger(typeof(TesseractOcrUtil))
.Info(MessageFormatUtil.Format(Tesseract4LogMessageConstant.CANNOT_CONVERT_IMAGE_TO_GRAYSCALE, depth));
return(pix);
}
}
else
{
return(pix);
}
}
private void bw_DEBUG_OCR(object sender, DoWorkEventArgs e)
{
var watch = Stopwatch.StartNew();
string processedTextResults = "";
string preProcessedTextResults = "";
int hits = 0;
BackgroundWorker worker = sender as BackgroundWorker;
Process[] processes = Process.GetProcessesByName("Eternal");
Process p = processes.FirstOrDefault();
IntPtr windowHandle;
if (p != null)
{
windowHandle = p.MainWindowHandle;
// difference is 20 ms between these two function
//Image img22 = CaptureWindow(windowHandle);
Pix img = CaptureWindowPix(windowHandle);
img = img.ConvertRGBToGray(0.40f, 0.34f, 0.26f);
//img = img.BinarizeOtsuAdaptiveThreshold(img.Width / 5, img.Height / 5, 10, 10, 0.1f);
// img = img.BinarizeSauvolaTiled();
//img = img.INVERT
img = img.Scale(scalingFactor, scalingFactor);
//img = img.BinarizeOtsuAdaptiveThreshold(img.Width / 5, img.Height / 5, 10, 10, 0.1f);
//img = img.UNSHARPMASK
//img = img.BinarizeOtsuAdaptiveThreshold(2000, 2000, 0, 0, 0.0f);
//img = img.SELECTBYSIZE // removeNoise
//var dpiX = 300;
//var dpiY = 300;
//Bitmap screenshotBitmap = PixConverter.ToBitmap(img);
//screenshotBitmap.SetResolution(dpiX, dpiY);
//DEBUG_PrintImage(img, "manualPreProcessing", watch);
for (int i = 0; i < 12; i++)
{
//formGraphics.DrawRectangle(new Pen(new SolidBrush(Color.Pink)), Cards[i].WholeCardBounding);
//formGraphics.DrawRectangle(new Pen(new SolidBrush(Color.Aqua)), Cards[i].TextboxBounding);
//formGraphics.DrawRectangle(new Pen(new SolidBrush(Color.Bisque)), Cards[i].RankLocation.X, Cards[i].RankLocation.Y, 10, 10);
Rect textbox_Scaled = new Rect(
Cards[i].TextboxBounding.X * (int)scalingFactor,
Cards[i].TextboxBounding.Y * (int)scalingFactor,
Cards[i].TextboxBounding.Width * (int)scalingFactor,
Cards[i].TextboxBounding.Height * (int)scalingFactor);
using (Page processedImage = ocrEngine.Process(img, textbox_Scaled))
{
DEBUG_PrintImage(processedImage.GetThresholdedImage(), "lower rez (individual)" + i, watch);
var text = processedImage.GetText();
preProcessedTextResults += text.Replace("\n", "") + Environment.NewLine;
text = CleanText(text);
processedTextResults += text + Environment.NewLine;
if (cardRankings.ContainsKey(text))
{
Cards[i].Rank = cardRankings[text];
hits++;
}
else if (!String.IsNullOrEmpty(text))
{
List <SymSpell.suggestItem> suggestions = null;
suggestions = SymSpell.Lookup(text, "", SymSpell.editDistanceMax);
if (suggestions.Count > 0)
{
Cards[i].Rank = cardRankings[suggestions.First().term];
hits++;
}
else
{
Cards[i].Rank = "U";
}
}
else
{
Cards[i].Rank = string.Empty;
}
}
}
RenderRankings();
}
watch.Stop();
var elapsedMs = watch.ElapsedMilliseconds;
OutputTestResults(elapsedMs, processedTextResults, hits, preProcessedTextResults);
}
public override Pix Handle(Pix request)
{
request = request?.ConvertRGBToGray();
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;
}
}
}
}
}
}
}
}
}
}
}
}
