// Processes exactly one page, returns data on 1 single page
public TesseractOutput OCRImageFile(String PathToPngFile, Boolean Debug)
{
try
{
var testImagePath = PathToPngFile;
w.WriteLine("DEBUG - Tesseract Engine Loading...");
using (var engine = new TesseractEngine(this.TessDataPath, this.TessLanguage, EngineMode.Default))
{
w.WriteLine("DEBUG - Tesseract Image Loading...");
using (var img = Pix.LoadFromFile(testImagePath))
{
w.WriteLine("DEBUG - Tesseract Page Loading...");
using (var page = engine.Process(img))
{
w.WriteLine("DEBUG - Tesseract Get Page Content...");
var text = page.GetText();
if (Debug)
{
Console.WriteLine("\nDEBUG: Tesseract Mean Confidence: {0}", page.GetMeanConfidence());
}
w.WriteLine("DEBUG - Tesseract Confidence: " + page.GetMeanConfidence());
TesseractOutput to = new TesseractOutput(page.GetMeanConfidence(), text);
this.w.Flush();
return(to);
}
}
}
}
catch (Exception e)
{
w.WriteLine("DEBUG - Tesseract Error: " + e.Message);
w.WriteLine("DEBUG - Tesseract Error Details: " + e.ToString());
//Trace.TraceError(e.ToString());
//if (Debug) { Console.WriteLine("\nUnexpected Error: " + e.Message); }
//if (Debug) { Console.WriteLine("\nDetails: "); }
//if (Debug) { Console.WriteLine(e.ToString()); }
//Console.ReadKey();
this.w.Flush();
return(null);
}
}
public Dictionary <int, String> GetDictionaryFromPdf(String RootPath, String FileName, String PathToTessData, String Language, Boolean Debug)
{
// Split PDF into individual Pages using PDFSharp (PDFSharp in NuGet Package Manager)
Dictionary <int, String> DocumentContent = new Dictionary <int, String>();
//String RootPath = @"C:\dev\docs\";
// "90000081.pdf"
// accounting for C:\mypath and C:\mypath\
if (!RootPath.EndsWith(@"\") && !RootPath.EndsWith("/"))
{
RootPath = RootPath + "/";
}
String TempPath = RootPath + guid + @"\";
String LogFile = TempPath + "run.log";
System.IO.Directory.CreateDirectory(TempPath);
StreamWriter w = File.AppendText(LogFile);
PdfSharpUtils psu = new PdfSharpUtils(w);
psu.SplitAllPDFPages(RootPath, FileName, TempPath, Debug);
// Now convert each pdf file into a png file
// requires ImageMagick Wrapper for C# (Magick.NET Q16 Any CPU in NuGet Package manager)
// because we do PDF conversions, the target system on which this is running requires install GhostScript
ImageMagickUtils imu = new ImageMagickUtils(300, 300, w);
string[] PdfFiles = Directory.GetFiles(TempPath, "*.pdf", SearchOption.TopDirectoryOnly);
w.WriteLine("DEBUG - Number of PDF Files Found: " + PdfFiles.Count());
w.Flush();
foreach (string filepath in PdfFiles)
{
imu.ConvertPDFToPng(filepath, filepath + ".png");
}
// Now using Tesseract to OCR the single pdf page turned into a png file (Tesseract in NuGet Package Manager)
// this involves downloading the Tesseract language data files locally (see tessdata below).
//ConfigItem item = LoadJson();
TesseractUtils tu = new TesseractUtils(PathToTessData, Language, w);
string[] PngFiles = Directory.GetFiles(TempPath, "*.png", SearchOption.TopDirectoryOnly);
foreach (string filepath in PngFiles)
{
if (Debug)
{
Console.WriteLine("\nDEBUG: Processing Temp Image File: " + filepath);
}
w.WriteLine("DEBUG: Processing Temp Image File: " + filepath);
String filename = Path.GetFileName(filepath);
String[] tempArr = filename.Split('_');
String PageNum = tempArr[0];
if (Debug)
{
Console.WriteLine("\nDEBUG: Current Page Number: " + PageNum);
}
w.WriteLine("DEBUG: Current Page Number: " + PageNum);
TesseractOutput to = tu.OCRImageFile(filepath, Debug);
//Console.WriteLine(to.getText());
int PageNumAsInt = -1;
try
{
PageNumAsInt = Int32.Parse(PageNum);
if (to != null)
{
w.WriteLine("DEBUG: Adding Document to Dictionary: " + PageNumAsInt);
DocumentContent.Add(PageNumAsInt, to.getText());
}
else
{
w.WriteLine("DEBUG: ERROR, Could not add Document to Dictionary (Tesseract Output seems empty?): " + PageNumAsInt);
}
}
catch (Exception e)
{
// do nothing and quit?
w.WriteLine("DEBUG: Error in Page Number Retrieved from File Name (it isnt a valid Integer?): " + PageNum);
}
//Console.ReadKey();
w.Flush();
}
w.Close();
// Delete Temp folder if not in Debug mode
if (!Debug)
{
System.IO.Directory.Delete(TempPath, true);
}
return(DocumentContent);
}
