OCR 軟體試用：探索頂尖選擇

// OmniPage: Engine must be initialized before any operations
// License file must exist at this path on every target machine
using var engine = new OmniPageEngine();
engine.SetLicenseFile(@"C:\Program Files\OmniPage\license.lic");
engine.Initialize();  // Contacts license server; loads 100MB+ of native components

// Configure recognition settings for the document
var settings = new RecognitionSettings
{
    PrimaryLanguage = "English",
    SecondaryLanguages = new[] { "German", "French" },
    AccuracyMode = "Maximum",
    PreserveLayout = true,
    DetectTables = true,
    DespeckleLevel = 2,
    ContrastEnhancement = true,
    AutoRotate = true,
    DeskewImage = true
};

// Document-centric workflow
var document = engine.CreateDocument();
document.AddPage(imagePath);
document.Recognize(settings);
string text = document.GetText();

// Explicit cleanup — omitting this can lock the license
document.Dispose();
engine.Shutdown();

Imports OmniPage

' OmniPage: Engine must be initialized before any operations
' License file must exist at this path on every target machine
Using engine As New OmniPageEngine()
    engine.SetLicenseFile("C:\Program Files\OmniPage\license.lic")
    engine.Initialize()  ' Contacts license server; loads 100MB+ of native components

    ' Configure recognition settings for the document
    Dim settings As New RecognitionSettings With {
        .PrimaryLanguage = "English",
        .SecondaryLanguages = {"German", "French"},
        .AccuracyMode = "Maximum",
        .PreserveLayout = True,
        .DetectTables = True,
        .DespeckleLevel = 2,
        .ContrastEnhancement = True,
        .AutoRotate = True,
        .DeskewImage = True
    }

    ' Document-centric workflow
    Dim document = engine.CreateDocument()
    document.AddPage(imagePath)
    document.Recognize(settings)
    Dim text As String = document.GetText()

    ' Explicit cleanup — omitting this can lock the license
    document.Dispose()
    engine.Shutdown()
End Using

// Step 1: Install
// dotnet add package IronOcr

// Step 2: Configure license (one line at startup)
IronOcr.License.LicenseKey = "YOUR-LICENSE-KEY";

// Step 3: Read a document
var text = new IronTesseract().Read("document.jpg").Text;

' Step 1: Install
' dotnet add package IronOcr

' Step 2: Configure license (one line at startup)
IronOcr.License.LicenseKey = "YOUR-LICENSE-KEY"

' Step 3: Read a document
Dim text As String = (New IronTesseract()).Read("document.jpg").Text

<PackageReference Include="IronOcr" Version="2024.x.x" />

// OmniPage: License validation at engine startup
// Each of these can fail independently
public static void InitializeWithLicense(string licensePath)
{
    // Failure mode 1: File missing (deployment error, path misconfiguration)
    if (!File.Exists(licensePath))
        throw new LicenseException("License file not found");

    // Failure mode 2: File permissions (service account lacks read access)
    try { using var stream = File.OpenRead(licensePath); }
    catch (UnauthorizedAccessException)
    {
        throw new LicenseException("Cannot read license file — check permissions");
    }

    // Failure mode 3: License server unreachable (network partition, server restart)
    var engine = new OmniPageEngine();
    engine.SetLicenseFile(licensePath);

    try
    {
        engine.Initialize(); // Network call to license server
    }
    catch (LicenseValidationException ex)
    {
        // Could be: expired, invalid hardware, concurrent seat limit exceeded,
        // license server unreachable, or maintenance window
        throw new LicenseException($"License validation failed: {ex.Message}");
    }
}

Imports System.IO

' OmniPage: License validation at engine startup
' Each of these can fail independently
Public Shared Sub InitializeWithLicense(licensePath As String)
    ' Failure mode 1: File missing (deployment error, path misconfiguration)
    If Not File.Exists(licensePath) Then
        Throw New LicenseException("License file not found")
    End If

    ' Failure mode 2: File permissions (service account lacks read access)
    Try
        Using stream = File.OpenRead(licensePath)
        End Using
    Catch ex As UnauthorizedAccessException
        Throw New LicenseException("Cannot read license file — check permissions")
    End Try

    ' Failure mode 3: License server unreachable (network partition, server restart)
    Dim engine As New OmniPageEngine()
    engine.SetLicenseFile(licensePath)

    Try
        engine.Initialize() ' Network call to license server
    Catch ex As LicenseValidationException
        ' Could be: expired, invalid hardware, concurrent seat limit exceeded,
        ' license server unreachable, or maintenance window
        Throw New LicenseException($"License validation failed: {ex.Message}")
    End Try
End Sub

// One line at application startup
IronOcr.License.LicenseKey = "YOUR-LICENSE-KEY";

// Optional: verify license status
bool isLicensed = IronOcr.License.IsLicensed;

// Works offline — no license server, no network calls at runtime
var text = new IronTesseract().Read("document.jpg").Text;

Imports IronOcr

' One line at application startup
IronOcr.License.LicenseKey = "YOUR-LICENSE-KEY"

' Optional: verify license status
Dim isLicensed As Boolean = IronOcr.License.IsLicensed

' Works offline — no license server, no network calls at runtime
Dim text As String = New IronTesseract().Read("document.jpg").Text

// OmniPage pattern: service class with engine lifecycle
public class KofaxDocumentService : IDisposable
{
    private OmniPageEngine _engine;

    public KofaxDocumentService(string licensePath)
    {
        _engine = new OmniPageEngine();
        _engine.SetLicenseFile(licensePath);
        _engine.Initialize();
    }

    public string ProcessDocument(string imagePath)
    {
        var document = _engine.CreateDocument();
        document.AddPage(imagePath);
        document.Recognize(new RecognitionSettings { Language = "English" });
        string text = document.GetText();
        document.Dispose();  // Must not be forgotten
        return text;
    }

    public void Dispose()
    {
        _engine.Shutdown();  // Must not be forgotten
    }
}

//IronOCRequivalent: no lifecycle management needed
public class IronOcrDocumentService
{
    private readonly IronTesseract _ocr;

    public IronOcrDocumentService()
    {
        _ocr = new IronTesseract();
        _ocr.Language = OcrLanguage.English;
    }

    public string ProcessDocument(string imagePath)
    {
        using var input = new OcrInput();
        input.LoadImage(imagePath);
        return _ocr.Read(input).Text;
    }
    //不是Dispose — no unmanaged resources to release
}

Imports System

' OmniPage pattern: service class with engine lifecycle
Public Class KofaxDocumentService
    Implements IDisposable

    Private _engine As OmniPageEngine

    Public Sub New(licensePath As String)
        _engine = New OmniPageEngine()
        _engine.SetLicenseFile(licensePath)
        _engine.Initialize()
    End Sub

    Public Function ProcessDocument(imagePath As String) As String
        Dim document = _engine.CreateDocument()
        document.AddPage(imagePath)
        document.Recognize(New RecognitionSettings With {.Language = "English"})
        Dim text As String = document.GetText()
        document.Dispose()  ' Must not be forgotten
        Return text
    End Function

    Public Sub Dispose() Implements IDisposable.Dispose
        _engine.Shutdown()  ' Must not be forgotten
    End Sub
End Class

' IronOCRequivalent: no lifecycle management needed
Public Class IronOcrDocumentService

    Private ReadOnly _ocr As IronTesseract

    Public Sub New()
        _ocr = New IronTesseract()
        _ocr.Language = OcrLanguage.English
    End Sub

    Public Function ProcessDocument(imagePath As String) As String
        Using input As New OcrInput()
            input.LoadImage(imagePath)
            Return _ocr.Read(input).Text
        End Using
    End Function
    ' 不是Dispose — no unmanaged resources to release
End Class

// Extract text from a scanned PDF — no extra module or license
using var input = new OcrInput();
input.LoadPdf("scanned-contract.pdf");
var result = new IronTesseract().Read(input);
Console.WriteLine(result.Text);

// Create a searchable PDF from a scanned-only PDF
result.SaveAsSearchablePdf("contract-searchable.pdf");

// Process specific pages from a large PDF
using var input = new OcrInput();
input.LoadPdfPages("large-report.pdf", 1, 10);  // Pages 1–10 only
var result = new IronTesseract().Read(input);

Imports IronOcr

' Extract text from a scanned PDF — no extra module or license
Using input As New OcrInput()
    input.LoadPdf("scanned-contract.pdf")
    Dim result = New IronTesseract().Read(input)
    Console.WriteLine(result.Text)
End Using

' Create a searchable PDF from a scanned-only PDF
result.SaveAsSearchablePdf("contract-searchable.pdf")

' Process specific pages from a large PDF
Using input As New OcrInput()
    input.LoadPdfPages("large-report.pdf", 1, 10)  ' Pages 1–10 only
    Dim result = New IronTesseract().Read(input)
End Using

// Add language packs as NuGet packages, not installer components
// dotnet add package IronOcr.Languages.German
// dotnet add package IronOcr.Languages.French

var ocr = new IronTesseract();
ocr.Language = OcrLanguage.English;
ocr.AddSecondaryLanguage(OcrLanguage.German);
ocr.AddSecondaryLanguage(OcrLanguage.French);

using var input = new OcrInput();
input.LoadImage("multilingual-document.jpg");
var result = ocr.Read(input);

Imports IronOcr

' Add language packs as NuGet packages, not installer components
' dotnet add package IronOcr.Languages.German
' dotnet add package IronOcr.Languages.French

Dim ocr As New IronTesseract()
ocr.Language = OcrLanguage.English
ocr.AddSecondaryLanguage(OcrLanguage.German)
ocr.AddSecondaryLanguage(OcrLanguage.French)

Using input As New OcrInput()
    input.LoadImage("multilingual-document.jpg")
    Dim result = ocr.Read(input)
End Using

// OmniPage: preprocessing embedded in RecognitionSettings
var preprocessSettings = new PreprocessingSettings
{
    AutoRotate = true,
    Deskew = true,
    DespeckleLevel = 2,
    ContrastEnhancement = true,
    NoiseReduction = true
};
var recognitionSettings = new RecognitionSettings
{
    Language = "English",
    Preprocessing = preprocessSettings
};

// IronOCR: preprocessing as method pipeline on OcrInput
using var input = new OcrInput();
input.LoadImage(imagePath);
input.Deskew();
input.DeNoise();
input.Contrast();
input.Binarize();
input.EnhanceResolution(300);
var result = new IronTesseract().Read(input);

Imports IronOcr

' OmniPage: preprocessing embedded in RecognitionSettings
Dim preprocessSettings As New PreprocessingSettings With {
    .AutoRotate = True,
    .Deskew = True,
    .DespeckleLevel = 2,
    .ContrastEnhancement = True,
    .NoiseReduction = True
}
Dim recognitionSettings As New RecognitionSettings With {
    .Language = "English",
    .Preprocessing = preprocessSettings
}

' IronOCR: preprocessing as method pipeline on OcrInput
Using input As New OcrInput()
    input.LoadImage(imagePath)
    input.Deskew()
    input.DeNoise()
    input.Contrast()
    input.Binarize()
    input.EnhanceResolution(300)
    Dim result = New IronTesseract().Read(input)
End Using