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#1 Posted : Friday, April 7, 2017 3:56:44 PM(UTC)


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It is possible to do this using LEADTOOLS, by using the Multimedia Screen Capture filter in conjunction with LEADTOOLS OCR. Once the screen capture is made, an event is raised which contains a RasterImage containing the current screen contents. This information can then be passed to the OcrEngine and recognized accordingly.

Here's how this can be done by wiring in the OCR engine to process a screenshot raised from the event and save it to disk.


void scEngine_CaptureInformation(object sender, ScreenCaptureInformationEventArgs e) 
    // Define codecs class object to save the image 
    RasterCodecs codecs = new RasterCodecs(); 
    codecs.ThrowExceptionsOnInvalidImages = true; 

    using (IOcrEngine ocrEngine = OcrEngineManager.CreateEngine(OcrEngineType.LEAD, false)) 
        // Start the engine using default parameters 
        ocrEngine.Startup(null, null, null, LEAD_VARS.OcrLeadRuntimeDir); 

        // Create an OCR document 
        using (IOcrDocument ocrDocument = ocrEngine.DocumentManager.CreateDocument()) 
            // Add a page to the document 
            IOcrPage ocrPage = ocrDocument.Pages.AddPage(e.Image, null); 
            // Save the document we have as PDF 
            ocrDocument.Save(pdfFileName, DocumentFormat.Pdf, null); 
        // Shutdown the engine 
        // Note: calling Dispose will also automatically shutdown the engine if it has been started 

For more information on creating, configuring and using the screenshot engine, and about OCR, see our documentation pages.

Furthermore, we have a demo application which showcases this functionality created by a LEADTOOLS support agent. More information as well as source code is available on its info page.

Edited by moderator Wednesday, December 27, 2023 3:36:09 PM(UTC)  | Reason: Updated

Nick Crook
Developer Support Engineer
LEAD Technologies, Inc.

Try the latest version of LEADTOOLS for free for 60 days by downloading the evaluation: https://www.leadtools.com/downloads

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