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LEADTOOLS OCR (Leadtools.Forms.Ocr assembly)
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GetFontNames Method








Leadtools.Forms.Ocr Assembly > Leadtools.Forms.Ocr Namespace > IOcrDocumentManager Interface : GetFontNames Method
The language name. See remarks for more information.
Gets the font names used in the final document.
Syntax
string[] GetFontNames( 
   string languageName
)
'Declaration
 

Function GetFontNames( _
   ByVal languageName As String _
) As String()
'Usage
 

Dim instance As IOcrDocumentManager
Dim languageName As String
Dim value() As String
 
value = instance.GetFontNames(languageName)
string[] GetFontNames( 
   string languageName
)
- (nullable NSArray<NSString *> *)fontNamesForLanguage:(LTOcrLanguage)language 
                                                 error:(NSError **)error
            
public String[] getFontNames(String languageName)
function Leadtools.Forms.Ocr.IOcrDocumentManager.GetFontNames( 
   languageName 
)

Parameters

languageName
The language name. See remarks for more information.

Return Value

An array of six string values that contains the font names used in the final document.
Remarks

Use GetFontNames and SetFontNames to get/set the fonts used in the final recognized document (PDF, DOC, HTML, etc). The fonts will not be used when the final document format is text.

The OCR engine uses six different fonts when creating the final output document as follows. The following table shows the array index and the font description:

Index Description
0 The font used with proportional serif characters
1 The font used with proportional sans-serif characters
2 The font used with monospaced serif characters
3 The font used with monospaced sans-serif characters
4 The font used with ICR (hand-written) characters
5 The font used with MICR (check font) characters

The OcrCharacter.FontStyle member of each character returned in IOcrPage.GetRecognizedCharacters determines which font to use with the character. If the zone is ICR or MICR (the OcrZone.ZoneType member is OcrZoneType.Icr or OcrZoneType.Micrthen the character will use the ICR or MICR fonts accordingly.

The OCR engine keeps a list of fonts for some languages, for example all the Latin languages currently use the same font. So passing languageName equals to "en" for English or "de" for German will change the default Latin fonts used in the final document. This is the equivalent of passing null (Nothing in Visual Basic).

If the OCR engine supports Asian languages, then each language will have its own font sets and you can get/set these fonts individually. Currently, the LEADTOOLS OCR toolkits supports individual fonts for Latin (null), Japanese (ja), Korean (ko), Chinese (zh-Hans and zh-Hant) and Korean (ko). The following table lists the default fonts used for each language:

Language Fonts
Latin (all other languages) including languageName equals to null
Font Value
Proportional Serif Times New Roman
Proportional Sans-Serif Arial
Monospace Serif Courier New
Monospace Sans-Serif Arial
ICR Bookman Old Style
MICR Arial Unicode MS
Japanese (languageName equals to "ja")
Font Value
Proportional Serif MS PMincho
Proportional Sans-Serif MS PGothic
Monospace Serif MS Gothic
Monospace Sans-Serif SimSun
ICR MS Gothic
MICR SimSun
Chinese (languageName equals to "zh-Hans" or "zh-Hant")
Font Value
Proportional Serif SimSun
Proportional Sans-Serif SimHei
Monospace Serif Hei Simplified
Monospace Sans-Serif SimSun
ICR Hei Simplified
MICR SimSun
Korean (languageName equals to "ko")
Font Value
Proportional Serif Gungsuh
Proportional Sans-Serif Gulim
Monospace Serif Dotum
Monospace Sans-Serif Gungsuh
ICR Dotum
MICR Gungsuh

Note that changing the fonts is not recommended in most cases, the character position and size is calculated based on the default fonts even if the user changes the fonts before the recognition process. After the changing the fonts, it might be required to use IOcrPage.GetRecognizedCharacters and IOcrPage.SetRecognizedCharacters to further change the character position and font size to create the final output document.

Example
Copy Code   
Imports Leadtools
Imports Leadtools.Codecs
Imports Leadtools.Forms.Ocr
Imports Leadtools.Forms
Imports Leadtools.Forms.DocumentWriters
Imports Leadtools.WinForms

<TestMethod>
Public Sub DocumentFontsTest()
   Using codecs As New RasterCodecs()
      Using ocrEngine As IOcrEngine = OcrEngineManager.CreateEngine(OcrEngineType.Advantage, False)
         ocrEngine.Startup(codecs, Nothing, Nothing, LEAD_VARS.OcrAdvantageRuntimeDir)
         Dim ocrDocumentManager As IOcrDocumentManager = ocrEngine.DocumentManager

         Using ocrDocument As IOcrDocument = ocrEngine.DocumentManager.CreateDocument()
            ' Add a page to OCR
            Dim ocrPage As IOcrPage = ocrDocument.Pages.AddPage(Path.Combine(LEAD_VARS.ImagesDir, "Ocr1.tif"), Nothing)

            ocrPage.AutoZone(Nothing)
            ocrPage.Recognize(Nothing)

            ' Show the current fonts used to save default documents
            Console.WriteLine("Saving use the following fonts:")
            ShowFonts(ocrDocumentManager)
            ocrDocument.Save(Path.Combine(LEAD_VARS.ImagesDir, "Ocr1_DefaultFonts.pdf"), DocumentFormat.Pdf, Nothing)

            ' Now change the fonts to something else
            Dim newFonts As String() = ocrDocumentManager.GetFontNames(Nothing)

            ' Use Cambira for Proportional Serif font - instead of Times New Roman
            newFonts(0) = "Cambria"
            ' Use Calibri for Proportional Sans-serif font - instead of Arial
            newFonts(1) = "Calibri"
            ' Use Lucida Console for Monospace fonts (both Serif and Sans-serif)
            newFonts(2) = "Lucida Console"
            newFonts(3) = "Lucida Console"
            ' Leave the ICR and MICR fonts the same

            ocrDocumentManager.SetFontNames(Nothing, newFonts)

            ' Show the new fonts used to save default documents
            Console.WriteLine("Saving use the following fonts:")
            ShowFonts(ocrDocumentManager)
            ocrDocument.Save(Path.Combine(LEAD_VARS.ImagesDir, "Ocr1_CustomFonts.pdf"), DocumentFormat.Pdf, Nothing)
         End Using
      End Using
   End Using
End Sub

Private Shared Sub ShowFonts(ocrDocumentManager As IOcrDocumentManager)
   ' Get the default fonts
   ' The default fonts will be used for all Latin languages
   Dim fonts As String() = ocrDocumentManager.GetFontNames(Nothing)

   ' This should return an array of 6 items, as follows:
   Console.WriteLine("Proportional Serif font:        " & fonts(0))
   Console.WriteLine("Proportional Sans-serif font:   " & fonts(1))
   Console.WriteLine("Monospace Serif font:           " & fonts(2))
   Console.WriteLine("Monospace Sans-serif font:      " & fonts(3))
   Console.WriteLine("ICR (hand-written) font:        " & fonts(4))
   Console.WriteLine("MICR (Check) font:              " & fonts(5))
End Sub

Public NotInheritable Class LEAD_VARS
Public Const ImagesDir As String = "C:\Users\Public\Documents\LEADTOOLS Images"
Public Const OcrAdvantageRuntimeDir As String = "C:\LEADTOOLS 19\Bin\Common\OcrAdvantageRuntime"
End Class
using Leadtools;
using Leadtools.Codecs;
using Leadtools.Forms.Ocr;
using Leadtools.Forms;
using Leadtools.Forms.DocumentWriters;
using Leadtools.WinForms;

public void DocumentFontsTest()
{
   using (RasterCodecs codecs = new RasterCodecs())
   {
      using (IOcrEngine ocrEngine = OcrEngineManager.CreateEngine(OcrEngineType.Advantage, false))
      {
         ocrEngine.Startup(codecs, null, null, LEAD_VARS.OcrAdvantageRuntimeDir);
         IOcrDocumentManager ocrDocumentManager = ocrEngine.DocumentManager;

         using (IOcrDocument ocrDocument = ocrEngine.DocumentManager.CreateDocument())
         {
            // Add a page to OCR
            IOcrPage ocrPage = ocrDocument.Pages.AddPage(Path.Combine(LEAD_VARS.ImagesDir, "Ocr1.tif"), null);

            ocrPage.AutoZone(null);
            ocrPage.Recognize(null);

            // Show the current fonts used to save default documents
            Console.WriteLine("Saving use the following fonts:");
            ShowFonts(ocrDocumentManager);
            ocrDocument.Save(Path.Combine(LEAD_VARS.ImagesDir, "Ocr1_DefaultFonts.pdf"), DocumentFormat.Pdf, null);

            // Now change the fonts to something else
            string[] newFonts = ocrDocumentManager.GetFontNames(null);

            // Use Cambira for Proportional Serif font - instead of Times New Roman
            newFonts[0] = "Cambria";
            // Use Calibri for Proportional Sans-serif font - instead of Arial
            newFonts[1] = "Calibri";
            // Use Lucida Console for Monospace fonts (both Serif and Sans-serif)
            newFonts[2] = "Lucida Console";
            newFonts[3] = "Lucida Console";
            // Leave the ICR and MICR fonts the same

            ocrDocumentManager.SetFontNames(null, newFonts);

            // Show the new fonts used to save default documents
            Console.WriteLine("Saving use the following fonts:");
            ShowFonts(ocrDocumentManager);
            ocrDocument.Save(Path.Combine(LEAD_VARS.ImagesDir, "Ocr1_CustomFonts.pdf"), DocumentFormat.Pdf, null);
         }
      }
   }
}

private static void ShowFonts(IOcrDocumentManager ocrDocumentManager)
{
   // Get the default fonts
   // The default fonts will be used for all Latin languages
   string[] fonts = ocrDocumentManager.GetFontNames(null);

   // This should return an array of 6 items, as follows:
   Console.WriteLine("Proportional Serif font:        " + fonts[0]);
   Console.WriteLine("Proportional Sans-serif font:   " + fonts[1]);
   Console.WriteLine("Monospace Serif font:           " + fonts[2]);
   Console.WriteLine("Monospace Sans-serif font:      " + fonts[3]);
   Console.WriteLine("ICR (hand-written) font:        " + fonts[4]);
   Console.WriteLine("MICR (Check) font:              " + fonts[5]);
}

static class LEAD_VARS
{
public const string ImagesDir = @"C:\Users\Public\Documents\LEADTOOLS Images";
public const string OcrAdvantageRuntimeDir = @"C:\LEADTOOLS 19\Bin\Common\OcrAdvantageRuntime";
}
Requirements

Target Platforms

See Also

Reference

IOcrDocumentManager Interface
IOcrDocumentManager Members
IOcrPage.Recognize
IOcrDocument Interface
IOcrDocument.Save
IOcrDocument.SaveXml
IOcrEngine Interface
OcrEngineManager Class
OcrEngineType Enumeration
Programming with the LEADTOOLS .NET OCR

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Leadtools.Forms.Ocr requires a Recognition or Document Imaging Suite license and unlock key. For more information, refer to: LEADTOOLS Toolkit Features