How to read PDF with scanned image and hindi text in C# with ByteScout Robotic Process Automation

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Program.cs

      
using System; using System.Collections.Generic; using System.IO; using System.Text; using System.Drawing.Imaging; using Bytescout.PDFExtractor; using Bytescout.PDF; using System.Diagnostics; namespace ReadPDFWithImageHindiText { class Program { static void Main(string[] args) { try { // Files string fileName = "hindi_text_with_image.pdf"; string destFileName = "output_hindi_text_with_image.pdf"; string destFileName_serachable = "output_hindi_text_with_image_searchable.pdf"; // Read all text from pdf file string allTextExtracted = ""; using (TextExtractor extractor = new TextExtractor()) { // Load PDF document extractor.LoadDocumentFromFile(fileName); // Read all text directly allTextExtracted = extractor.GetText(); } // Get image from pdf file MemoryStream memoryStream = new MemoryStream(); using (ImageExtractor extractor = new ImageExtractor()) { // Load PDF document extractor.LoadDocumentFromFile(fileName); if (extractor.GetFirstImage()) { extractor.SaveCurrentImageToStream(memoryStream, ImageFormat.Png); } } // Load image from file to System.Drawing.Image object (we need it to get the image resolution) using (System.Drawing.Image sysImage = System.Drawing.Image.FromStream(memoryStream)) { // Compute image size in PDF units (Points) float widthInPoints = sysImage.Width / sysImage.HorizontalResolution * 72f; float heightInPoints = sysImage.Height / sysImage.VerticalResolution * 72f; // Create new PDF document using (Document outPdfDocument = new Document()) { outPdfDocument.RegistrationName = "demo"; outPdfDocument.RegistrationKey = "demo"; // Create page of computed size Page page = new Page(widthInPoints, heightInPoints); // Add page to the document outPdfDocument.Pages.Add(page); Canvas canvas = page.Canvas; // Create Bytescout.PDF.Image object from loaded image Image pdfImage = new Image(sysImage); // Draw the image canvas.DrawImage(pdfImage, 0, 0, widthInPoints, heightInPoints); // Dispose the System.Drawing.Image object to free resources sysImage.Dispose(); // Create brush SolidBrush transparentBrush = new SolidBrush(new ColorGray(0)); // ... and make it transparent transparentBrush.Opacity = 0; // Draw text with transparent brush // Need to set Font which supports hindi characters. Font font16 = new Font("Arial Unicode MS", 16); canvas.DrawString(allTextExtracted, font16, transparentBrush, 40, 40); // Save document to file outPdfDocument.Save(destFileName); } } // Make PDF file with hindi text searchable to OCR. using (SearchablePDFMaker searchablePDFMaker = new SearchablePDFMaker()) { //Load PDF document searchablePDFMaker.LoadDocumentFromFile(destFileName); // Set the location of "tessdata" folder containing language data files /* * It used following files for hindi language support. Need to put these files into "testdata" folder. Below location contains these files. * https://github.com/tesseract-ocr/tessdata/tree/3.04.00 hin.traineddata hin.cube.bigrams hin.cube.lm hin.cube.nn hin.cube.params hin.cube.word-freq hin.tesseract_cube.nn */ searchablePDFMaker.OCRLanguageDataFolder = @"c:\Program Files\Bytescout PDF Extractor SDK\Redistributable\net2.00\tessdata\"; // Set OCR language searchablePDFMaker.OCRLanguage = "hin"; // Need to set Font which supports hindi characters searchablePDFMaker.LabelingFont = "Arial Unicode MS"; // Set PDF document rendering resolution searchablePDFMaker.OCRResolution = 300; searchablePDFMaker.MakePDFSearchable(destFileName_serachable); } // Open document in default PDF viewer app Process.Start(destFileName_serachable); } catch (Exception ex) { Console.WriteLine("ERROR:" + ex.Message); } Console.ReadLine(); } } }

ReadPDFWithImageHindiText.csproj

      
<?xml version="1.0" encoding="utf-8"?> <Project ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003"> <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" /> <PropertyGroup> <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration> <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform> <ProjectGuid>{99735776-2956-463D-9795-EBCE16928C30}</ProjectGuid> <OutputType>Exe</OutputType> <RootNamespace>ReadPDFWithImageHindiText</RootNamespace> <AssemblyName>ReadPDFWithImageHindiText</AssemblyName> <TargetFrameworkVersion>v2.0</TargetFrameworkVersion> <FileAlignment>512</FileAlignment> </PropertyGroup> <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' "> <PlatformTarget>AnyCPU</PlatformTarget> <DebugSymbols>true</DebugSymbols> <DebugType>full</DebugType> <Optimize>false</Optimize> <OutputPath>bin\Debug\</OutputPath> <DefineConstants>DEBUG;TRACE</DefineConstants> <ErrorReport>prompt</ErrorReport> <WarningLevel>4</WarningLevel> </PropertyGroup> <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' "> <PlatformTarget>AnyCPU</PlatformTarget> <DebugType>pdbonly</DebugType> <Optimize>true</Optimize> <OutputPath>bin\Release\</OutputPath> <DefineConstants>TRACE</DefineConstants> <ErrorReport>prompt</ErrorReport> <WarningLevel>4</WarningLevel> </PropertyGroup> <ItemGroup> <Reference Include="Bytescout.PDF, Version=1.8.2.254, Culture=neutral, PublicKeyToken=f7dd1bd9d40a50eb, processorArchitecture=MSIL"> <SpecificVersion>False</SpecificVersion> <HintPath>c:\Program Files\Bytescout PDF SDK\net2.0\Bytescout.PDF.dll</HintPath> </Reference> <Reference Include="Bytescout.PDFExtractor, Version=9.1.0.3170, Culture=neutral, PublicKeyToken=f7dd1bd9d40a50eb, processorArchitecture=MSIL"> <SpecificVersion>False</SpecificVersion> <HintPath>c:\Program Files\Bytescout PDF Extractor SDK\net2.00\Bytescout.PDFExtractor.dll</HintPath> </Reference> <Reference Include="System" /> <Reference Include="System.Data" /> <Reference Include="System.Drawing" /> <Reference Include="System.Xml" /> </ItemGroup> <ItemGroup> <Compile Include="Program.cs" /> </ItemGroup> <ItemGroup> <None Include="hindi_text_with_image.pdf"> <CopyToOutputDirectory>Always</CopyToOutputDirectory> </None> </ItemGroup> <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" /> </Project>

ReadPDFWithImageHindiText.sln

      
Microsoft Visual Studio Solution File, Format Version 12.00 # Visual Studio 15 VisualStudioVersion = 15.0.27703.2026 MinimumVisualStudioVersion = 10.0.40219.1 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "ReadHindiText", "ReadPDFWithImageHindiText.csproj", "{99735776-2956-463D-9795-EBCE16928C30}" EndProject Global GlobalSection(SolutionConfigurationPlatforms) = preSolution Debug|Any CPU = Debug|Any CPU Release|Any CPU = Release|Any CPU EndGlobalSection GlobalSection(ProjectConfigurationPlatforms) = postSolution {99735776-2956-463D-9795-EBCE16928C30}.Debug|Any CPU.ActiveCfg = Debug|Any CPU {99735776-2956-463D-9795-EBCE16928C30}.Debug|Any CPU.Build.0 = Debug|Any CPU {99735776-2956-463D-9795-EBCE16928C30}.Release|Any CPU.ActiveCfg = Release|Any CPU {99735776-2956-463D-9795-EBCE16928C30}.Release|Any CPU.Build.0 = Release|Any CPU EndGlobalSection GlobalSection(SolutionProperties) = preSolution HideSolutionNode = FALSE EndGlobalSection GlobalSection(ExtensibilityGlobals) = postSolution SolutionGuid = {3ABE3EEF-B212-4E8B-9A74-67A52FD333AC} EndGlobalSection EndGlobal

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