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#1 Posted : Thursday, February 17, 2011 8:36:54 PM(UTC)

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Posts: 1

Hi, I am just trying to integrate Leadtools OCR engine to my project. I get a piece of code from CodeProject tells me how to integrate OCR engine to .net projects.

But somehow it doesn't work. I try the same process from the demo program, it read me the number which I need. But when I try to process it with my application. It returns me empty string. I dont know why. Below is the code part shows how I process the image in my application with OCR engine. Is that anyone can tell me whats wrong with it?

public string GetTextFromBuffImage(Bitmap image)
            // *** Step 3: Create an OCR document with one or more pages.
            IOcrDocument ocrDocument = _ocrEngine.DocumentManager.CreateDocument();

            var rasterImage = RasterImageConverter.ConvertFromImage(image, ConvertFromImageOptions.None);
            // Add all the pages of a multi-page TIF image to the document
            ocrDocument.Pages.AddPages(rasterImage, 1, -1, null);

            // *** Step 4: Establish zones on the page(s), either manually or automatically
            // Automatic zoning
            LogicalRectangle rect = new LogicalRectangle(0, 0, image.Width, image.Height, LogicalUnit.Pixel);
            OcrZone zone = new OcrZone();
            zone.Bounds = RestrictZoneBoundsToPage(ocrDocument.Pages[0], rect);

            // *** Step 7: (Optional) Set any special recognition module options
            // Change the fill method for the first zone in the first page to be default
            OcrZone ocrZone = ocrDocument.Pages[0].Zones[0];
            ocrZone.FillMethod = OcrZoneFillMethod.Default;
            ocrDocument.Pages[0].Zones[0] = ocrZone;

            // *** Step 8: Recognize

            // *** Step 9: Save recognition results
            // Save the results to a PDF file
            var result = ocrDocument.Pages[0].RecognizeText(null);

            return result;

        private static LogicalRectangle RestrictZoneBoundsToPage(IOcrPage ocrPage, LogicalRectangle bounds)
            RasterImage image = ocrPage.GetRasterImage();
            LeadRect pageBounds = new LeadRect(0, 0, image.ImageWidth, image.ImageHeight);
            LeadRect rc = bounds.ToRectangle(ocrPage.DpiX, ocrPage.DpiY);

            rc = LeadRect.Intersect(pageBounds, rc);
            return LogicalRectangle.FromRectangle(rc);

BTW I initialised my engine out side the class passed in as a parameter. Thanks a lot.

Using LeadTools V17

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#2 Posted : Sunday, February 20, 2011 4:42:31 AM(UTC)

Adnan Ismail  

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Posts: 3,022

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The following forum post contains a simplified v16.5 .NET OCR demo. Please try it and if it doesn't work, tell me what errors you are getting when you try it.

The same demo can be used with LEADTOOLS v17 .NET assemblies.
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