private void backgroundWorker3_DoWork(object sender, DoWorkEventArgs e)
{
string selectedImageFile = (string)e.Argument;
FileInfo imageFile = new FileInfo(selectedImageFile);
if (selectedImageFile.ToLower().EndsWith(".pdf"))
{
string workingTiffFileName = null;
try
{
workingTiffFileName = Utilities.ConvertPdf2Tiff(selectedImageFile);
imageList = ImageIOHelper.GetImageList(new FileInfo(workingTiffFileName));
}
finally
{
if (workingTiffFileName != null && File.Exists(workingTiffFileName))
{
File.Delete(workingTiffFileName);
}
}
}
else
{
imageList = ImageIOHelper.GetImageList(imageFile);
}
e.Result = imageFile;
}
/// <summary>
/// Opens image file.
/// </summary>
/// <param name="selectedImageFile"></param>
public void openFile(string selectedImageFile)
{
FileInfo imageFile = new FileInfo(selectedImageFile);
if (selectedImageFile.ToLower().EndsWith(".pdf"))
{
try
{
string workingTiffFileName = Utilities.ConvertPdf2Tiff(selectedImageFile);
FileInfo workingTiffFile = new FileInfo(workingTiffFileName);
imageList = ImageIOHelper.GetImageList(workingTiffFile);
workingTiffFile.Delete();
}
catch (Exception e)
{
MessageBox.Show(this, e.Message + "\nPlease install Ghostscript and/or set system path to the library object.", strProgName, MessageBoxButtons.OK, MessageBoxIcon.Error);
return;
}
}
else
{
imageList = ImageIOHelper.GetImageList(imageFile);
}
if (imageList == null)
{
MessageBox.Show(this, Properties.Resources.Cannotloadimage, strProgName, MessageBoxButtons.OK, MessageBoxIcon.Error);
return;
}
imageTotal = imageList.Count;
imageIndex = 0;
displayImage();
this.Text = imageFile.Name + " - " + strProgName;
this.toolStripStatusLabel1.Text = null;
this.pictureBox1.Deselect();
this.toolStripBtnFitImage.Enabled = true;
this.toolStripBtnZoomIn.Enabled = true;
this.toolStripBtnZoomOut.Enabled = true;
this.toolStripBtnRotateCCW.Enabled = true;
this.toolStripBtnRotateCW.Enabled = true;
if (imageList.Count == 1)
{
this.toolStripBtnNext.Enabled = false;
this.toolStripBtnPrev.Enabled = false;
}
else
{
this.toolStripBtnNext.Enabled = true;
this.toolStripBtnPrev.Enabled = true;
}
setButton();
}
/// <summary>
/// Convert PDF to TIFF format.
/// </summary>
/// <param name="inputPdfFile"></param>
/// <returns>a multi-page TIFF image</returns>
public static string ConvertPdf2Tiff(string inputPdfFile)
{
try {
string[] pngFiles = ConvertPdf2Png(inputPdfFile);
string tiffFile = Path.GetTempFileName();
tiffFile = Path.ChangeExtension(tiffFile, ".tif");
// put PNG images into a single multi-page TIFF image for return
ImageIOHelper.MergeTiff(pngFiles, tiffFile);
// delete temporary PNG images
foreach (string tempFile in pngFiles)
{
new FileInfo(tempFile).Delete();
}
return(tiffFile);
}
catch (Exception e)
{
Console.WriteLine("ERROR: " + e.Message);
return(null);
}
}
void PerformOCR(string[] args)
{
try
{
if (args[0] == "-?" || args[0] == "-help" || args.Length == 1 || args.Length == 3 || args.Length == 5)
{
Console.WriteLine("Usage: vietocr imagefile outputfile [-l lang] [-psm pagesegmode]");
return;
}
FileInfo imageFile = new FileInfo(args[0]);
FileInfo outputFile = new FileInfo(args[1]);
if (!imageFile.Exists)
{
Console.WriteLine("Input file does not exist.");
return;
}
string curLangCode = "eng"; //default language
string psm = "3"; // or alternatively, "PSM_AUTO"; // 3 - Fully automatic page segmentation, but no OSD (default)
if (args.Length == 4)
{
if (args[2].Equals("-l"))
{
curLangCode = args[3];
}
else if (args[2].Equals("-psm"))
{
psm = args[3];
}
}
else if (args.Length == 6)
{
curLangCode = args[3];
psm = args[5];
try
{
Int16.Parse(psm);
}
catch
{
Console.WriteLine("Invalid input value.");
return;
}
}
IList <Image> imageList = ImageIOHelper.GetImageList(imageFile);
OCR <Image> ocrEngine = new OCRImages();
ocrEngine.PSM = psm;
string result = ocrEngine.RecognizeText(imageList, curLangCode);
// postprocess to correct common OCR errors
result = Processor.PostProcess(result, curLangCode);
// correct common errors caused by OCR
result = TextUtilities.CorrectOCRErrors(result);
// correct letter cases
result = TextUtilities.CorrectLetterCases(result);
using (StreamWriter sw = new StreamWriter(outputFile.FullName + ".txt", false, new System.Text.UTF8Encoding()))
{
sw.Write(result);
}
}
catch (Exception e)
{
Console.WriteLine("Error: " + e.Message);
}
}
