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How to extract the text from specific coordinates of the PDF document?

Platform: ASP.NET Web Forms |
Control: PdfViewer

You can extract the text from the specific coordinates of the PDF document using the OCR process in the server side as workaround. Refer the following code snippet for the same.


<asp:Content ID="BodyContent" runat="server" ContentPlaceHolderID="MainContent">
     <table width="70%" style="height: 31px;left:15%;position:absolute">
           <tr style="width: 100%;text-align:center">
                <td >
                    <asp:FileUpload ID="FileUpload1" runat="server" />
                    <asp:Button ID="Button1" runat="server" onclick="Button1_Click" 
                        Text="ExtractText" />
    <div style="left:15%;position:absolute; top:88px">
     <asp:TextBox ID="TextBox1" runat="server" TextMode="multiline" Height="259px" Width="888px"></asp:TextBox>


protected void Button1_Click(object sender, EventArgs e)
if (System.IO.Path.GetExtension(FileUpload1.PostedFile.FileName).Equals(".pdf"))
                //Get the pdf file stream 
                Stream pdfStream = FileUpload1.PostedFile.InputStream;
                //Create an instance for PdfLoadedDocument
                PdfLoadedDocument ldoc = new PdfLoadedDocument(pdfStream);
                System.Drawing.RectangleF bnds = new System.Drawing.RectangleF(30, 60, 300, 300);
                using (System.Drawing.Bitmap image = ldoc.ExportAsImage(1))
                    Bitmap clippedImage = image.Clone(bnds, image.PixelFormat);
                    //Performs OCR for the cloned image to extract the text.
                    using (OCRProcessor pro = new OCRProcessor(HttpContext.Current.Request.PhysicalApplicationPath + "//Tesseract binaries//"))
                        pro.Settings.Language = Languages.English;
                        var text = pro.PerformOCR(clippedImage, HttpContext.Current.Request.PhysicalApplicationPath + "//Tessdata//");
                        TextBox1.Text += text;
            }        }




Clicking on the extract text button in the above sample will export the PDF document page as image using ExportAsImage method in PdfLoadedDocument, the resultant image is then clipped with the provided rectangle. Then the clipped image is OCRed to get the text from the image.  


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