Work with OCR Settings

In addition to image recognition with default language settings, ImageGear has the ability to specify the language to be recognized on a page. If the language on the recognized page is known prior to recognition, defining the language will make the recognition more precise because the appropriate character sets will be used in the recognition process and dictionaries specific to the language dictionaries will be applied to recognized character constructions.

Use the LanguageEnabled property of ImGearOCRSettings to define a specific language or languages.

Set a specific language in this collection to true if the language is used on the page to be recognized.
Set a specific language to false to exclude the language from the recognition process.

The list of languages is separated into a few language groups. The languages from one group may be incompatible with languages from other groups. When the languages from different groups are enabled, recognition may return an error. To avoid using incompatible languages, the following list of language groups should be used:

Greek language.
Latin and Cyrillic language group unites CentralEurope languages, Cyrillic languages, WesternEurope languages, Turkish language and Baltic languages. This set of languages includes: Afrikaans, Albanian, Andorra, Argentina, Australia, Austria, AzerbaijanCyrillic, AzerbaijanLatin, Baltic, Basque, Belarusian, Belgium, Bosnian,
Brazil, Bulgarian, Canada, Catalan, CentralAmerica, CentralEurope, Chile, Colombia, Croatian, Cyrillic, Czech, Danish, Dutch, English, Estonian, Faroese,
Finnish, French, Frisian, German, GreatBritain, Guarani, Hani, Hungarian, Icelandic, Indonesian, Irish, Italian, JapanLatinOnly, KazakhCyrillic, KazakhLatin,
KirghizCyrillic, Kirundi, Latin, Latvian, Liechtenstein, Lithuanian, Luxembourgish, Macedonian, Malay, Mexico, Netherlands, NewZealand, Norwegian,
Polish, Portuguese, Quechua, RhaetoRomanic, Romanian, Russian, Rwanda, Scandinavia, SerbianCyrillic, Shona, Slovak, Slovenian, Somali, Sorbian,
SouthAfrica, SouthAmerica, Spanish, Swahili, Swedish, Switzerland, TajikCyrillic, Turkish, TurkmenCyrillic, TurkmenLatin, Ukrainian, USA, UzbekCyrillic,
UzbekLatin, Venezuela, WesternEurope, Wolof, Xhosa, Zulu.
ChineseSimplified and ChineseTraditional languages.
ChineseHongKong language.
Japanese language.
Korean language.
Thai language.

You require an ImageGear license that includes support for Asian languages to enable the following:

ChineseSimplified
ChineseTraditional
ChineseHongKong
Japanese
Korean
Thai

The following example illustrates how to recognize a page containing only French text.

CS
VBNET

C#	Copy Code
using System; using ImageGear.Core; using ImageGear.OCR; public static string RecognizeFrenchText(ImGearRasterPage rasterPage) { string resultString = null; // Initialization of ImGearOCR by default. using (ImGearOCR igOcr = ImGearOCR.Create()) { // Turn off all languages. foreach (ImGearOCRLanguage language in Enum.GetValues(typeof(ImGearOCRLanguage))) igOcr.Settings.LanguageEnabled[language] = false; // Turn on only French language. igOcr.Settings.LanguageEnabled[ImGearOCRLanguage.FRE] = true; // Import ImageGear page to recognition repository. using (ImGearOCRPage igOcrPage = igOcr.ImportPage(rasterPage)) { igOcrPage.Recognize(); resultString = igOcrPage.Text; } } return resultString; }

Copy Code

using System;
using ImageGear.Core;
using ImageGear.OCR;
public static string RecognizeFrenchText(ImGearRasterPage rasterPage)
{
    string resultString = null;

    // Initialization of ImGearOCR by default.
    using (ImGearOCR igOcr = ImGearOCR.Create())
    {
        // Turn off all languages.
        foreach (ImGearOCRLanguage language in Enum.GetValues(typeof(ImGearOCRLanguage)))
                    igOcr.Settings.LanguageEnabled[language] = false;

        // Turn on only French language.
        igOcr.Settings.LanguageEnabled[ImGearOCRLanguage.FRE] = true;

        // Import ImageGear page to recognition repository.
        using (ImGearOCRPage igOcrPage = igOcr.ImportPage(rasterPage))
        {
            igOcrPage.Recognize();
            resultString = igOcrPage.Text;
        }
    }

    return resultString;
 }

VB.NET	Copy Code
Imports System Imports ImageGear.Core Imports ImageGear.OCR Public Shared Function RecognizeFrenchLanguage(ByVal rasterPage As ImGearRasterPage) As String Dim resultString As String = Nothing Using igOcr As ImGearOCR = ImGearOCR.Create() For Each language As ImGearOCRLanguage In [Enum].GetValues(GetType(ImGearOCRLanguage)) igOcr.Settings.LanguageEnabled(language) = False Next igOcr.Settings.LanguageEnabled(ImGearOCRLanguage.FRE) = True Using igOcrPage As ImGearOCRPage = igOcr.ImportPage(rasterPage) igOcrPage.Recognize() resultString = igOcrPage.Text End Using End Using Return resultString End Function

VB.NET

Copy Code

Imports System
Imports ImageGear.Core
Imports ImageGear.OCR
Public Shared Function RecognizeFrenchLanguage(ByVal rasterPage As ImGearRasterPage) As String
    Dim resultString As String = Nothing

    Using igOcr As ImGearOCR = ImGearOCR.Create()

        For Each language As ImGearOCRLanguage In [Enum].GetValues(GetType(ImGearOCRLanguage))
                    igOcr.Settings.LanguageEnabled(language) = False
        Next

        igOcr.Settings.LanguageEnabled(ImGearOCRLanguage.FRE) = True

        Using igOcrPage As ImGearOCRPage = igOcr.ImportPage(rasterPage)
            igOcrPage.Recognize()
            resultString = igOcrPage.Text
        End Using
    End Using

    Return resultString
End Function