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How to extract text from the predefined rectangle from a PDF document?

Platform: WPF |
Control: PdfViewer
Tags: pdf, extracttext

In WinForms PDF Viewer you can extract text from the given rectangular region on a page by exporting the page to an image, cloning the exported image with the given rectangle, and performing OCR on the cloned image. Refer to the following code snippet.



PdfLoadedDocument loadedDocument = new PdfLoadedDocument("../../Data/Barcode.pdf");
            using (OCRProcessor processor = new OCRProcessor("../../Tesseract binaries"))
                //Language to process the OCR
                processor.Settings.Language = Languages.English;
                Bitmap image = loadedDocument.ExportAsImage(0);
                //Define the bounds from which the text to be extracted
                Rectangle textBounds = new Rectangle(274, 53, 68, 15);
                //Point to Pixel conversion
                RectangleF rect = new RectangleF(textBounds.X * 1.3333f, textBounds.Y * 1.3333f, textBounds.Width * 1.3333f, textBounds.Height * 1.3333f);
                using (Bitmap clonedImage = image.Clone(rect, System.Drawing.Imaging.PixelFormat.Format32bppArgb))
                    string ocrText = processor.PerformOCR(clonedImage, @"../../Tessdata/");                 


Sample link:



I hope you enjoyed learning about how to extract text from the predefined rectangle from a PDF document. 

You can refer to our  WinForms PDF Viewer’s feature tour page to know about its other groundbreaking feature representations. You can also explore our WinForms PDF Viewer documentation to understand how to present and manipulate data. 


For current customers, you can check out our WinForms from the License and Downloads page. If you are new to Syncfusion, you can try our 30-day free trial to check out our WinForms PDF Viewer and other WinForms components.


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