ByteScout PDF Extractor SDK - VB.NET - OCR with Multiple Languages - ByteScout

ByteScout PDF Extractor SDK – VB.NET – OCR with Multiple Languages

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OCR with multiple languages in VB.NET using ByteScout PDF Extractor SDK

ByteScout PDF Extractor SDK is the SDK is designed to help developers with pdf tables and pdf data extraction from unstructured documents like pdf, tiff, scans, images, scanned and electronic forms. The library is powered by OCR, computer vision and AI to provide unique functionality like table detection, automatic table structure extraction, data restoration, data restructuring and reconstruction. Supports PDF, TIFF, PNG, JPG images as input and can output CSV, XML, JSON formatted data. Includes full set of utilities like pdf splitter, pdf merger, searchable pdf maker and other utilities.

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Program.vb
      
Imports Bytescout.PDFExtractor ' This example demonstrates the use of Optical Character Recognition (OCR) to extract text ' from scanned PDF documents and raster images. ' To make OCR work you should add the following references to your project: ' "Bytescout.PDFExtractor.dll", "Bytescout.PDFExtractor.OCRExtension.dll". Class Program Friend Shared Sub Main(args As String()) ' Create Bytescout.PDFExtractor.TextExtractor instance Dim extractor As New TextExtractor() extractor.RegistrationName = "demo" extractor.RegistrationKey = "demo" ' Load sample PDF document extractor.LoadDocumentFromFile("multi_language_ocr.pdf") ' Enable Optical Character Recognition (OCR) ' in .Auto mode (SDK automatically checks if needs to use OCR or not) extractor.OCRMode = OCRMode.Auto ' Set the location of OCR language data files extractor.OCRLanguageDataFolder = "c:\Program Files\Bytescout PDF Extractor SDK\ocrdata_best" ' Set OCR language targeting multiple languages english and french extractor.OCRLanguage = "eng+fra" ' "eng" for english, "deu" for German, "fra" for French, "spa" for Spanish etc - according to files in "ocrdata" folder ' Find more language files at https://github.com/bytescout/ocrdata ' Set PDF document rendering resolution extractor.OCRResolution = 300 ' You can also apply various preprocessing filters ' to improve the recognition on low-quality scans. ' Automatically deskew skewed scans 'extractor.OCRImagePreprocessingFilters.AddDeskew() ' Remove vertical or horizontal lines (sometimes helps to avoid OCR engine's page segmentation errors) 'extractor.OCRImagePreprocessingFilters.AddVerticalLinesRemover() 'extractor.OCRImagePreprocessingFilters.AddHorizontalLinesRemover() ' Repair broken letters 'extractor.OCRImagePreprocessingFilters.AddDilate() ' Remove noise 'extractor.OCRImagePreprocessingFilters.AddMedian() ' Apply Gamma Correction 'extractor.OCRImagePreprocessingFilters.AddGammaCorrection() ' Add Contrast ' extractor.OCRImagePreprocessingFilters.AddContrast(20) ' (!) You can use new OCRAnalyzer class to find an optimal set of image preprocessing ' filters for your specific document. ' See "OCR Analyser" example. ' Save extracted text to file extractor.SaveTextToFile("output.txt") ' Cleanup extractor.Dispose() ' Open output file in default associated application System.Diagnostics.Process.Start("output.txt") End Sub End Class

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ScannedPdfToText.VS2005.vbproj
      
<Project DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003"> <PropertyGroup> <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration> <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform> <ProductVersion>8.0.50727</ProductVersion> <SchemaVersion>2.0</SchemaVersion> <ProjectGuid>{393E826B-A9B3-4E6A-AD48-6C790AFF8283}</ProjectGuid> <OutputType>Exe</OutputType> <RootNamespace>ScannedPdfToText</RootNamespace> <AssemblyName>ScannedPdfToText</AssemblyName> </PropertyGroup> <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' "> <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' "> <DebugType>pdbonly</DebugType> <Optimize>true</Optimize> <OutputPath>bin\Release\</OutputPath> <DefineConstants>TRACE</DefineConstants> <ErrorReport>prompt</ErrorReport> <WarningLevel>4</WarningLevel> </PropertyGroup> <Import Project="$(MSBuildBinPath)\Microsoft.VisualBasic.Targets" /> <ItemGroup> <Import Include="Microsoft.VisualBasic" /> <Import Include="System" /> <Reference Include="Bytescout.PDFExtractor, Version=4.0.0.1542, Culture=neutral, PublicKeyToken=f7dd1bd9d40a50eb, processorArchitecture=MSIL"> <SpecificVersion>False</SpecificVersion> </Reference> <Reference Include="Bytescout.PDFExtractor.OCRExtension, Version=4.0.0.1542, Culture=neutral, PublicKeyToken=f7dd1bd9d40a50eb, processorArchitecture=MSIL"> <SpecificVersion>False</SpecificVersion> </Reference> <Reference Include="System" /> <Reference Include="System.Data" /> <Reference Include="System.Xml" /> <Compile Include="Program.vb" /> <Content Include="..\..\multi_language_ocr.pdf"> <CopyToOutputDirectory>Always</CopyToOutputDirectory> <Link>multi_language_ocr.pdf</Link> </Content> </ItemGroup> </Project>

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ScannedPdfToText.VS2008.vbproj
      
<Project ToolsVersion="3.5" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003"> <PropertyGroup> <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration> <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform> <ProductVersion>8.0.50727</ProductVersion> <SchemaVersion>2.0</SchemaVersion> <ProjectGuid>{393E826B-A9B3-4E6A-AD48-6C790AFF8283}</ProjectGuid> <OutputType>Exe</OutputType> <RootNamespace>ScannedPdfToText</RootNamespace> <AssemblyName>ScannedPdfToText</AssemblyName> </PropertyGroup> <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' "> <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' "> <DebugType>pdbonly</DebugType> <Optimize>true</Optimize> <OutputPath>bin\Release\</OutputPath> <DefineConstants>TRACE</DefineConstants> <ErrorReport>prompt</ErrorReport> <WarningLevel>4</WarningLevel> </PropertyGroup> <Import Project="$(MSBuildBinPath)\Microsoft.VisualBasic.Targets" /> <ItemGroup> <Import Include="Microsoft.VisualBasic" /> <Import Include="System" /> <Reference Include="Bytescout.PDFExtractor, Version=4.0.0.1542, Culture=neutral, PublicKeyToken=f7dd1bd9d40a50eb, processorArchitecture=MSIL"> <SpecificVersion>False</SpecificVersion> </Reference> <Reference Include="Bytescout.PDFExtractor.OCRExtension, Version=4.0.0.1542, Culture=neutral, PublicKeyToken=f7dd1bd9d40a50eb, processorArchitecture=MSIL"> <SpecificVersion>False</SpecificVersion> </Reference> <Reference Include="System" /> <Reference Include="System.Data" /> <Reference Include="System.Xml" /> <Compile Include="Program.vb" /> <Content Include="..\..\multi_language_ocr.pdf"> <CopyToOutputDirectory>Always</CopyToOutputDirectory> <Link>multi_language_ocr.pdf</Link> </Content> </ItemGroup> </Project>

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ScannedPdfToText.VS2010.vbproj
      
<Project ToolsVersion="4.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003"> <PropertyGroup> <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration> <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform> <SchemaVersion>2.0</SchemaVersion> <ProjectGuid>{393E826B-A9B3-4E6A-AD48-6C790AFF8283}</ProjectGuid> <OutputType>Exe</OutputType> <RootNamespace>ScannedPdfToText</RootNamespace> <AssemblyName>ScannedPdfToText</AssemblyName> <TargetFrameworkVersion>v4.0</TargetFrameworkVersion> </PropertyGroup> <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' "> <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' "> <DebugType>pdbonly</DebugType> <Optimize>true</Optimize> <OutputPath>bin\Release\</OutputPath> <DefineConstants>TRACE</DefineConstants> <ErrorReport>prompt</ErrorReport> <WarningLevel>4</WarningLevel> </PropertyGroup> <Import Project="$(MSBuildToolsPath)\Microsoft.VisualBasic.Targets" /> <ItemGroup> <Import Include="Microsoft.VisualBasic" /> <Import Include="System" /> <Reference Include="Bytescout.PDFExtractor, Version=4.0.0.1542, Culture=neutral, PublicKeyToken=f7dd1bd9d40a50eb, processorArchitecture=MSIL"> <SpecificVersion>False</SpecificVersion> </Reference> <Reference Include="Bytescout.PDFExtractor.OCRExtension, Version=4.0.0.1542, Culture=neutral, PublicKeyToken=f7dd1bd9d40a50eb, processorArchitecture=MSIL"> <SpecificVersion>False</SpecificVersion> </Reference> <Reference Include="System" /> <Reference Include="System.Data" /> <Reference Include="System.Xml" /> <Compile Include="Program.vb" /> <Content Include="..\..\multi_language_ocr.pdf"> <CopyToOutputDirectory>Always</CopyToOutputDirectory> <Link>multi_language_ocr.pdf</Link> </Content> </ItemGroup> </Project>

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ScannedPdfToText.VS2012.vbproj
      
<Project ToolsVersion="4.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003"> <PropertyGroup> <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration> <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform> <SchemaVersion>2.0</SchemaVersion> <ProjectGuid>{393E826B-A9B3-4E6A-AD48-6C790AFF8283}</ProjectGuid> <OutputType>Exe</OutputType> <RootNamespace>ScannedPdfToText</RootNamespace> <AssemblyName>ScannedPdfToText</AssemblyName> <TargetFrameworkVersion>v4.0</TargetFrameworkVersion> </PropertyGroup> <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' "> <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' "> <DebugType>pdbonly</DebugType> <Optimize>true</Optimize> <OutputPath>bin\Release\</OutputPath> <DefineConstants>TRACE</DefineConstants> <ErrorReport>prompt</ErrorReport> <WarningLevel>4</WarningLevel> </PropertyGroup> <Import Project="$(MSBuildToolsPath)\Microsoft.VisualBasic.Targets" /> <ItemGroup> <Import Include="Microsoft.VisualBasic" /> <Import Include="System" /> <Reference Include="Bytescout.PDFExtractor, Version=4.0.0.1542, Culture=neutral, PublicKeyToken=f7dd1bd9d40a50eb, processorArchitecture=MSIL"> <SpecificVersion>False</SpecificVersion> </Reference> <Reference Include="Bytescout.PDFExtractor.OCRExtension, Version=4.0.0.1542, Culture=neutral, PublicKeyToken=f7dd1bd9d40a50eb, processorArchitecture=MSIL"> <SpecificVersion>False</SpecificVersion> </Reference> <Reference Include="System" /> <Reference Include="System.Data" /> <Reference Include="System.Xml" /> <Compile Include="Program.vb" /> <Content Include="..\..\multi_language_ocr.pdf"> <CopyToOutputDirectory>Always</CopyToOutputDirectory> <Link>multi_language_ocr.pdf</Link> </Content> </ItemGroup> </Project>

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ScannedPdfToText.VS2013.vbproj
      
<Project ToolsVersion="12.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003"> <PropertyGroup> <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration> <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform> <SchemaVersion>2.0</SchemaVersion> <ProjectGuid>{393E826B-A9B3-4E6A-AD48-6C790AFF8283}</ProjectGuid> <OutputType>Exe</OutputType> <RootNamespace>ScannedPdfToText</RootNamespace> <AssemblyName>ScannedPdfToText</AssemblyName> <TargetFrameworkVersion>v4.5</TargetFrameworkVersion> </PropertyGroup> <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' "> <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' "> <DebugType>pdbonly</DebugType> <Optimize>true</Optimize> <OutputPath>bin\Release\</OutputPath> <DefineConstants>TRACE</DefineConstants> <ErrorReport>prompt</ErrorReport> <WarningLevel>4</WarningLevel> </PropertyGroup> <Import Project="$(MSBuildToolsPath)\Microsoft.VisualBasic.Targets" /> <ItemGroup> <Import Include="Microsoft.VisualBasic" /> <Import Include="System" /> <Reference Include="Bytescout.PDFExtractor, Version=4.0.0.1542, Culture=neutral, PublicKeyToken=f7dd1bd9d40a50eb, processorArchitecture=MSIL"> <SpecificVersion>False</SpecificVersion> </Reference> <Reference Include="Bytescout.PDFExtractor.OCRExtension, Version=4.0.0.1542, Culture=neutral, PublicKeyToken=f7dd1bd9d40a50eb, processorArchitecture=MSIL"> <SpecificVersion>False</SpecificVersion> </Reference> <Reference Include="System" /> <Reference Include="System.Data" /> <Reference Include="System.Xml" /> <Compile Include="Program.vb" /> <Content Include="..\..\multi_language_ocr.pdf"> <CopyToOutputDirectory>Always</CopyToOutputDirectory> <Link>multi_language_ocr.pdf</Link> </Content> </ItemGroup> </Project>

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ScannedPdfToText.VS2015.vbproj
      
<Project ToolsVersion="14.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003"> <PropertyGroup> <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration> <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform> <SchemaVersion>2.0</SchemaVersion> <ProjectGuid>{393E826B-A9B3-4E6A-AD48-6C790AFF8283}</ProjectGuid> <OutputType>Exe</OutputType> <RootNamespace>ScannedPdfToText</RootNamespace> <AssemblyName>ScannedPdfToText</AssemblyName> <TargetFrameworkVersion>v4.5</TargetFrameworkVersion> </PropertyGroup> <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' "> <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' "> <DebugType>pdbonly</DebugType> <Optimize>true</Optimize> <OutputPath>bin\Release\</OutputPath> <DefineConstants>TRACE</DefineConstants> <ErrorReport>prompt</ErrorReport> <WarningLevel>4</WarningLevel> </PropertyGroup> <Import Project="$(MSBuildToolsPath)\Microsoft.VisualBasic.Targets" /> <ItemGroup> <Import Include="Microsoft.VisualBasic" /> <Import Include="System" /> <Reference Include="Bytescout.PDFExtractor, Version=4.0.0.1542, Culture=neutral, PublicKeyToken=f7dd1bd9d40a50eb, processorArchitecture=MSIL"> <SpecificVersion>False</SpecificVersion> </Reference> <Reference Include="Bytescout.PDFExtractor.OCRExtension, Version=4.0.0.1542, Culture=neutral, PublicKeyToken=f7dd1bd9d40a50eb, processorArchitecture=MSIL"> <SpecificVersion>False</SpecificVersion> </Reference> <Reference Include="System" /> <Reference Include="System.Data" /> <Reference Include="System.Xml" /> <Compile Include="Program.vb" /> <Content Include="..\..\multi_language_ocr.pdf"> <CopyToOutputDirectory>Always</CopyToOutputDirectory> <Link>multi_language_ocr.pdf</Link> </Content> </ItemGroup> <ItemGroup> <Folder Include="My Project\" /> </ItemGroup> </Project>

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