最佳 OCR 引擎：IronOCR vs 競爭者

// Klippa: manual HttpClient integration — no NuGet, no SDK
public class KlippaService
{
    private readonly HttpClient _client;
    private readonly string _apiKey;

    public KlippaService(string apiKey)
    {
        _apiKey = apiKey;
        _client = new HttpClient();
        _client.DefaultRequestHeaders.Add("X-Auth-Key", apiKey); // custom auth header
    }

    // Document upload to Klippa cloud — simplified, see Klippa documentation for full API
    // public async Task<ReceiptData> ProcessReceiptAsync(string imagePath)
    // {
    //     var content = new MultipartFormDataContent();
    //     content.Add(new ByteArrayContent(File.ReadAllBytes(imagePath)), "document", "receipt.jpg");
    //     var response = await _client.PostAsync(
    //         "https://custom-ocr.klippa.com/api/v1/parseDocument", content);
    //     // deserialize structured JSON response...
    // }
}

Imports System.Net.Http

Public Class KlippaService
    Private ReadOnly _client As HttpClient
    Private ReadOnly _apiKey As String

    Public Sub New(apiKey As String)
        _apiKey = apiKey
        _client = New HttpClient()
        _client.DefaultRequestHeaders.Add("X-Auth-Key", apiKey) ' custom auth header
    End Sub

    ' Document upload to Klippa cloud — simplified, see Klippa documentation for full API
    ' Public Async Function ProcessReceiptAsync(imagePath As String) As Task(Of ReceiptData)
    '     Dim content = New MultipartFormDataContent()
    '     content.Add(New ByteArrayContent(File.ReadAllBytes(imagePath)), "document", "receipt.jpg")
    '     Dim response = Await _client.PostAsync("https://custom-ocr.klippa.com/api/v1/parseDocument", content)
    '     ' deserialize structured JSON response...
    ' End Function
End Class

// IronOCR: extract text from any document type, then parse
var ocr = new IronTesseract();
var result = ocr.Read("invoice.jpg");

// Word coordinates and confidence — build any extraction logic on top
foreach (var word in result.Words)
{
    Console.WriteLine($"'{word.Text}' at ({word.X},{word.Y}) confidence: {word.Confidence}%");
}

// Or use region-based OCR to target specific fields
var totalRegion = new CropRectangle(400, 600, 200, 50); // bottom-right area
using var input = new OcrInput();
input.LoadImage("invoice.jpg", totalRegion);
var totalText = new IronTesseract().Read(input).Text;

Imports IronOcr

' IronOCR: extract text from any document type, then parse
Dim ocr As New IronTesseract()
Dim result = ocr.Read("invoice.jpg")

' Word coordinates and confidence — build any extraction logic on top
For Each word In result.Words
    Console.WriteLine($"'{word.Text}' at ({word.X},{word.Y}) confidence: {word.Confidence}%")
Next

' Or use region-based OCR to target specific fields
Dim totalRegion As New CropRectangle(400, 600, 200, 50) ' bottom-right area
Using input As New OcrInput()
    input.LoadImage("invoice.jpg", totalRegion)
    Dim totalText = New IronTesseract().Read(input).Text
End Using

// Klippa: document data leaves your network on every call
//不是configuration option changes this — it is the service's architecture
public class KlippaService
{
    public void ShowConsiderations()
    {
        Console.WriteLine("Klippa Considerations:");
        Console.WriteLine("1. Cloud-only - no on-premise option");
        Console.WriteLine("2. Per-document pricing");
        Console.WriteLine("3. Specialized for receipts/invoices");
        Console.WriteLine("4. Requires internet connection");
        Console.WriteLine("5. Documents sent to EU data centers");
    }
}

' Klippa: document data leaves your network on every call
'不是configuration option changes this — it is the service's architecture
Public Class KlippaService
    Public Sub ShowConsiderations()
        Console.WriteLine("Klippa Considerations:")
        Console.WriteLine("1. Cloud-only - no on-premise option")
        Console.WriteLine("2. Per-document pricing")
        Console.WriteLine("3. Specialized for receipts/invoices")
        Console.WriteLine("4. Requires internet connection")
        Console.WriteLine("5. Documents sent to EU data centers")
    End Sub
End Class

// IronOCR: all processing stays on your server
IronOcr.License.LicenseKey = "YOUR-LICENSE-KEY";

var ocr = new IronTesseract();
var result = ocr.Read("financial-statement.pdf"); // stays on your machine

// Build extraction logic on top of the raw result
var text = result.Text;
Console.WriteLine($"Processed {result.Pages.Count()} pages locally");
Console.WriteLine($"Confidence: {result.Confidence}%");

Imports IronOcr

' IronOCR: all processing stays on your server
IronOcr.License.LicenseKey = "YOUR-LICENSE-KEY"

Dim ocr As New IronTesseract()
Dim result = ocr.Read("financial-statement.pdf") ' stays on your machine

' Build extraction logic on top of the raw result
Dim text = result.Text
Console.WriteLine($"Processed {result.Pages.Count()} pages locally")
Console.WriteLine($"Confidence: {result.Confidence}%")

// IronOCR: process 10,000 documents — same cost as processing 10
var ocr = new IronTesseract();

Parallel.ForEach(Directory.GetFiles("receipts", "*.jpg"), filePath =>
{
    var result = new IronTesseract().Read(filePath);
    SaveResult(filePath, result.Text);
    // Each document: $0 marginal cost
});

Imports System.IO
Imports System.Threading.Tasks

' IronOCR: process 10,000 documents — same cost as processing 10
Dim ocr As New IronTesseract()

Parallel.ForEach(Directory.GetFiles("receipts", "*.jpg"), Sub(filePath)
    Dim result = (New IronTesseract()).Read(filePath)
    SaveResult(filePath, result.Text)
    ' Each document: $0 marginal cost
End Sub)

// IronOCR: installation is one command, first read is three lines
dotnet add package IronOcr

IronOcr.License.LicenseKey = "YOUR-LICENSE-KEY";
var text = new IronTesseract().Read("receipt.jpg").Text;

' IronOCR: installation is one command, first read is three lines
' dotnet add package IronOcr

IronOcr.License.LicenseKey = "YOUR-LICENSE-KEY"
Dim text As String = New IronTesseract().Read("receipt.jpg").Text

// IronOCR: build structured extraction from OcrResult
var result = new IronTesseract().Read("receipt.jpg");

// Use word positions to locate fields in known layout areas
var totalRegion = new CropRectangle(300, 500, 250, 60);
using var input = new OcrInput();
input.LoadImage("receipt.jpg", totalRegion);
var totalText = new IronTesseract().Read(input).Text;

// Line-based extraction for sequential field parsing
foreach (var line in result.Lines)
{
    if (line.Text.StartsWith("Total", StringComparison.OrdinalIgnoreCase))
        Console.WriteLine($"Total line: {line.Text}");
}

Imports IronOcr

' IronOCR: build structured extraction from OcrResult
Dim result = New IronTesseract().Read("receipt.jpg")

' Use word positions to locate fields in known layout areas
Dim totalRegion = New CropRectangle(300, 500, 250, 60)
Using input As New OcrInput()
    input.LoadImage("receipt.jpg", totalRegion)
    Dim totalText = New IronTesseract().Read(input).Text
End Using

' Line-based extraction for sequential field parsing
For Each line In result.Lines
    If line.Text.StartsWith("Total", StringComparison.OrdinalIgnoreCase) Then
        Console.WriteLine($"Total line: {line.Text}")
    End If
Next

// IronOCR: explicit preprocessing for phone-captured receipts
using var input = new OcrInput();
input.LoadImage("phone-photo-receipt.jpg");
input.Deskew();          // correct the camera angle
input.DeNoise();         // remove compression artifacts
input.Contrast();        // boost faded ink
input.EnhanceResolution(300); // normalize DPI

var result = new IronTesseract().Read(input);

Imports IronOcr

Dim result As OcrResult
Using input As New OcrInput()
    input.LoadImage("phone-photo-receipt.jpg")
    input.Deskew()          ' correct the camera angle
    input.DeNoise()         ' remove compression artifacts
    input.Contrast()        ' boost faded ink
    input.EnhanceResolution(300) ' normalize DPI

    result = New IronTesseract().Read(input)
End Using