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Extract Text From a Specific Part of the Image Using Aspose.OCR

Published: 24 Nov 2011 By Sher Azam

This technical tip shows how to Extract Text from Specific Part of the Image. Aspose.OCR for .NET provides OcrEngine class to extract text from a specific part of the image document. The OcrEngine class requires following three items for character recognition: 1. Source Image 2. Language 3. Resource file Steps to Extract Text from a Specific Recognition Block Below are the steps to perform OCR on image using OcrEngine class of Aspose.OCR for .NET component. 1. Create an instance of OcrEng

[C#]
 
const string resourceFileName = @"2011.07.02 v1.0 Aspose.OCR.Resources.zip";
 
try
{
    //Create OcrEngine instance and assign 
    //image, language and image configuration
    OcrEngine ocrEngine = new OcrEngine();
    ocrEngine.Image = ImageStream.FromFile("Sample.bmp");
 
    ocrEngine.Languages.AddLanguage(Language.Load("english"));
    ocrEngine.Config.NeedRotationCorrection = false;
    ocrEngine.Config.UseDefaultDictionaries = true;
 
    //Select the block to recognize text
    int startX = 0, startY = 0, width = 120, height = 100;
    IRecognitionBlock rectangleBlock = Aspose.OCR.RecognitionBlock.FromRectangle(startX, startY, width, height);
    ocrEngine.AddRecognitionBlock(rectangleBlock);
 
    //Set resource file name and extract OCR text
    using (ocrEngine.Resource = new FileStream(resourceFileName, FileMode.Open))
    {
        try
        {
            if (ocrEngine.Process())
            {
                Console.WriteLine(rectangleBlock.Text.ToString());
            }
        }
        catch (Exception ex)
        {
            Console.WriteLine("Exception: " + ex.Message);
        }
    }
    ocrEngine = null;
}
catch (Exception ex)
{
    Console.WriteLine("Exception: " + ex.Message);
}

[VB.NET]
 
Const resourceFileName As String = "2011.07.02 v1.0 Aspose.OCR.Resources.zip"
 
Try
              'Create OcrEngine instance and assign 
              'image, language and image configuration
              Dim ocrEngine As OcrEngine = New OcrEngine()
              ocrEngine.Image = ImageStream.FromFile("Sample.bmp")
 
              ocrEngine.Languages.AddLanguage(Language.Load("english"))
              ocrEngine.Config.NeedRotationCorrection = False
              ocrEngine.Config.UseDefaultDictionaries = True
 
              'Select the block to recognize text
              Dim startX As Integer = 0, startY As Integer = 0, width As Integer = 120, height As Integer = 100
              Dim rectangleBlock As IRecognitionBlock = Aspose.OCR.RecognitionBlock.FromRectangle(startX, startY, width, height)
              ocrEngine.AddRecognitionBlock(rectangleBlock)
 
              'Set resource file name and extract OCR text
              ocrEngine.Resource = New FileStream(resourceFileName, FileMode.Open)
              Using ocrEngine.Resource
                            Try
                                          If ocrEngine.Process() Then
                                                        Console.WriteLine(rectangleBlock.Text.ToString())
                                          End If
                            Catch ex As Exception
                                          Console.WriteLine("Exception: " & ex.Message)
                            End Try
              End Using
              ocrEngine = Nothing
Catch ex As Exception
              Console.WriteLine("Exception: " & ex.Message)
End Try

Extract Text from Specific Part of the Image do OCR on a Specific Block of Image Set the image file perform OCR on image OcrEngine class character recognition

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Extract Text From a Specific Part of the Image Using Aspose.OCR