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#1 Posted : Friday, June 30, 2017 4:11:47 PM(UTC)

Nick  
Nick

Groups: Registered, Tech Support, Administrators
Posts: 72

Was thanked: 1 time(s) in 1 post(s)

Sometimes, scanned documents are seperated into logical sections using patch pages. These patch pages are blank aside from a special type of barcode. The LEADTOOLS barcode SDK can recognize patch page codes and can subsequently be used to divide a PDF into multiple sections in memory. The code snippet below demonstrates this.

Code:

         BarcodeEngine engine = new BarcodeEngine();

         barcodeReader = engine.Reader;

         codecs.Options.Load.AllPages = true;
         RasterImage loadedImage = codecs.Load(@"Leadtools.pdf");
         List<RasterImage> docSections = new List<RasterImage>();

         // seed the initial documentSection with the first page of the document
         RasterImage img = loadedImage.Clone();

         // remove the first page since it's been seeded
         loadedImage.RemovePageAt(1);

         while (loadedImage.PageCount > 0)
         {
            BarcodeData[] data = barcodeReader.ReadBarcodes(rasterImage, Leadtools.Forms.LogicalRectangle.Empty, 0, new BarcodeSymbology[] { BarcodeSymbology.PatchCode });

	    bool isPatchPage = data.Length > 0;
	    
            // if we're on a patch page, finalize the current page range and begin a new one
            if (isPatchPage)
            {
               docSections.Add(img.CloneAll());

               loadedImage.RemovePageAt(1);
               img = loadedImage.Clone();

               loadedImage.RemovePageAt(1);
            }
            else // otherwise, add this page
            {
               img.AddPage(loadedImage);
            }
         }

         // add the lastly-created page
         docSections.Add(img);



This breaks the input document into a list of RasterImage objects, each RasterImage containing the page range between the patch pages. This can be modified to split documents by other parameters as well, such as different types of barcodes, detected characters via OCR, or anything else depending on development needs.

For more information, see our documentation on reading Barcodes.
https://www.leadtools.com/help/leadtools/v19m/dh/ba/barcodeengine.html
Nick Crook
Developer Support Engineer
LEAD Technologies, Inc.
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