private void Button_Click(object sender, RoutedEventArgs e)
{
if (files.Count <= 0)
{
return;
}
OcrButton.IsEnabled = false;
ocrButtonNormalContent = OcrButton.Content.ToString();
OcrButton.Content = "Please wait!";
lvFiles.AllowDrop = false;
for (int i = 0; i < files.Count; i++)
{
OcrFile file = files[i];
file.ClearStatus();
files[i] = file;
}
//Start a new thread for the image processing and ocr stuff
ConvertImageDelegate convertImageDelegate = new ConvertImageDelegate(ConvertImages);
convertImageDelegate.BeginInvoke(null, null);
}
private void UpdateFile(OcrFile file, int index)
{
files[index] = file;
}
private void ConvertImages()
{
for (int i = 0; i < files.Count; i++)
{
OcrFile file = files[i];
Bitmap bitmap = new Bitmap(file.FileInfo.FullName);
if (bitmap == null)
{
file.Status = "Not an image...";
//Refresh the UI
lvFiles.Dispatcher.BeginInvoke(DispatcherPriority.Normal, null, null);
continue;
}
string invertedImagePath = Path.Combine(file.FileInfo.DirectoryName, GetInvertedImageName(file.FileInfo));
//First remove transparency by drawing a black background and drawing the text on it
//Then invert the colors of the whole thing. It's better for the OCR
//Finally scale it, also better for the OCR
using (var b = new Bitmap(bitmap.Width, bitmap.Height))
{
b.SetResolution(bitmap.HorizontalResolution, bitmap.VerticalResolution);
using (var g = Graphics.FromImage(b))
{
g.Clear(Color.Black);
g.DrawImageUnscaled(bitmap, 0, 0);
}
MagickImage magickImage = new MagickImage(b);
magickImage.Negate(Channels.RGB);
//magickImage.FilterType = FilterType.Lanczos2;
magickImage.Resize(1024, 1024);
Bitmap inverted = magickImage.ToBitmap();
inverted.Save(invertedImagePath);
inverted.Dispose();
magickImage.Dispose();
}
try
{
using (var engine = new TesseractEngine(@"./tessdata", "eng", EngineMode.Default))
{
using (var img = Pix.LoadFromFile(invertedImagePath))
{
using (var page = engine.Process(img))
{
File.WriteAllText(string.Concat(file.FileInfo.FullName, ".txt"), page.GetText());
file.Confidence = page.GetMeanConfidence();
file.Status = string.Concat("Done! (", file.Confidence.ToString("0.00"), ")");
}
}
}
}
catch (Exception error)
{
file.Status = "Tesseract Error: " + error.Message;
}
File.Delete(invertedImagePath);
//Refresh the UI
lvFiles.Dispatcher.BeginInvoke(DispatcherPriority.Normal, new UpdateFileDelegate(UpdateFile), file, i);
}
//I have no idea what I'm doing...
//lvFiles.ItemsSource = null;
//lvFiles.ItemsSource = files;
Dispatcher.BeginInvoke(DispatcherPriority.Normal, new ConversionDoneDelegate(ConversionDone));
}
