private void backgroundWorkerConvertPdf_DoWork(object sender, DoWorkEventArgs e)
{
ArrayList args = (ArrayList)e.Argument;
string inputFile = (string)args[0];
string targetFile = (string)args[1];
string outputTiffFile = PdfUtilities.ConvertPdf2Tiff(inputFile);
File.Delete(targetFile);
File.Move(outputTiffFile, targetFile);
e.Result = targetFile;
}
private void backgroundWorkerConvertPdf_DoWork(object sender, DoWorkEventArgs e)
{
string[] inputFiles = (string[])e.Argument;
foreach (string inputFile in inputFiles)
{
string outputTiffFile = PdfUtilities.ConvertPdf2Tiff(inputFile);
string targetFile = Path.Combine(Path.GetDirectoryName(inputFile), Path.GetFileNameWithoutExtension(inputFile) + ".tif");
File.Delete(targetFile);
File.Move(outputTiffFile, targetFile);
e.Result = targetFile;
}
}
/// <summary>
/// Performs OCR for bulk/batch and console operations.
/// </summary>
/// <param name="imageFile">Image file</param>
/// <param name="outputFile">Output file without extension</param>
/// <param name="langCode">language code</param>
/// <param name="pageSegMode">page segmentation mode</param>
/// <param name="outputFormat">format of output file. Possible values: <code>text</code>, <code>text+</code> (with post-corrections), <code>hocr</code></param>
/// <param name="deskew">deskew</param>
public static void PerformOCR(string imageFile, string outputFile, string langCode, string pageSegMode, string outputFormat, bool deskew)
{
DirectoryInfo dir = Directory.GetParent(outputFile);
if (dir != null && !dir.Exists)
{
dir.Create();
}
bool postprocess = "text+" == outputFormat;
OCR <Image> ocrEngine = new OCRImages();
ocrEngine.PageSegMode = pageSegMode;
ocrEngine.Language = langCode;
ocrEngine.OutputFormat = outputFormat.Replace("+", string.Empty);
ocrEngine.OutputFile = outputFile;
ocrEngine.Deskew = deskew;
// convert PDF to TIFF
if (imageFile.ToLower().EndsWith(".pdf"))
{
imageFile = PdfUtilities.ConvertPdf2Tiff(imageFile);
}
ocrEngine.ProcessFile(imageFile);
// post-corrections for text+ output
if (postprocess)
{
string filename = outputFile + ".txt";
string result = File.ReadAllText(filename);
// postprocess to correct common OCR errors
result = Processor.PostProcess(result, langCode);
// correct letter cases
result = TextUtilities.CorrectLetterCases(result);
using (StreamWriter sw = new StreamWriter(filename, false, new System.Text.UTF8Encoding()))
{
sw.Write(result);
}
}
}