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#1 Posted : Monday, September 6, 2010 3:59:38 AM(UTC)


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Posts: 1


I've tried to recognize text via OCR from a PDF file. The PDF contains a scan of a document. The scanned document has text and some pictures in it. the pictures are irrelevant, i'm only interested in the text.

The problem is I got "Unsupported resolution." error on the code below:

_ocrEngine = OcrEngineManager.CreateEngine(OcrEngineType.Plus, False)
_ocrEngine.Startup(Nothing, Nothing, Nothing, Nothing)
_ocrDocument = _ocrEngine.DocumentManager.CreateDocument()
_ocrDocument.Pages.AddPage("c:\MyFile.PDF", Nothing)
_ocrDocument.Pages.Recognize(Nothing) ' I GET THE ERROR ON THIS ROW
_ocrDocument.Save(TextBox2.Text, DocumentFormat.Pdf, Nothing)

Thank you

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#2 Posted : Tuesday, September 7, 2010 2:44:26 AM(UTC)

Adnan Ismail  

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Posts: 3,022

Was thanked: 2 time(s) in 2 post(s)

By default our functions load PDF files with 72Dpi, which will trigger the "Unsupported resolution" error when you try to perform OCR on PDF file loaded with such resolution.

You can solve this issue by increasing the loading resolution of PDF files, to do that use an instance of the RasterCodecs class to increase loading PDF resolution and pass this instance the OCREngine.Startup method.
You can use code like this:
Leadtools.Codecs.RasterCodecs codecs = new Leadtools.Codecs.RasterCodecs();
codecs.Options.Pdf.Load.XResolution = 300;
codecs.Options.Pdf.Load.YResolution = 300;
ocrEngine.Startup(codecs, null, null, null);
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