如何使用 C# 中的 OCR 從收據中提取資料

using IronOcr;

class ReceiptScanner
{
    static void Main()
    {
        // Set the license key for IronOCR
        IronOcr.License.LicenseKey = "YOUR-KEY";

        // Instantiate OCR engine with optimal settings for receipts
        var ocr = new IronTesseract();

        // Configure for receipt-specific text
        ocr.Configuration.WhiteListCharacters = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789.$,- ";
        ocr.Configuration.BlackListCharacters = "~`@#%^*_+={}[]|\\:;\"'<>?";

        using var inputPhoto = new OcrInput();
        inputPhoto.LoadImage("supermarketexample.jpg");

        // Apply preprocessing for better accuracy
        inputPhoto.DeNoise();
        inputPhoto.ToGrayScale();
        inputPhoto.Contrast(1.2);

        // Perform OCR on the loaded image
        OcrResult result = ocr.Read(inputPhoto);

        // Output the text extracted from the receipt
        string text = result.Text;
        Console.WriteLine(text);

        // Extract specific data using OcrResult features
        foreach (var line in result.Lines)
        {
            if (line.Text.Contains("TOTAL"))
            {
                Console.WriteLine($"Total Found: {line.Text}");
            }
        }
    }
}

Imports IronOcr

Class ReceiptScanner
    Shared Sub Main()
        ' Set the license key for IronOCR
        IronOcr.License.LicenseKey = "YOUR-KEY"

        ' Instantiate OCR engine with optimal settings for receipts
        Dim ocr As New IronTesseract()

        ' Configure for receipt-specific text
        ocr.Configuration.WhiteListCharacters = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789.$,- "
        ocr.Configuration.BlackListCharacters = "~`@#%^*_+={}[]|\:;""'<>?"

        Using inputPhoto As New OcrInput()
            inputPhoto.LoadImage("supermarketexample.jpg")

            ' Apply preprocessing for better accuracy
            inputPhoto.DeNoise()
            inputPhoto.ToGrayScale()
            inputPhoto.Contrast(1.2)

            ' Perform OCR on the loaded image
            Dim result As OcrResult = ocr.Read(inputPhoto)

            ' Output the text extracted from the receipt
            Dim text As String = result.Text
            Console.WriteLine(text)

            ' Extract specific data using OcrResult features
            For Each line In result.Lines
                If line.Text.Contains("TOTAL") Then
                    Console.WriteLine($"Total Found: {line.Text}")
                End If
            Next
        End Using
    End Sub
End Class

OcrResult result = ocr.Read(inputPhoto);
string text = result.Text;
Console.WriteLine(text);
Console.WriteLine($"Overall Confidence: {result.Confidence}%");

// Check confidence for individual elements
foreach (var word in result.Words)
{
    if (word.Confidence < 80)
    {
        Console.WriteLine($"Low confidence word: '{word.Text}' ({word.Confidence}%)");
    }
}

// Validate numeric values
foreach (var block in result.Blocks)
{
    if (block.Text.Contains("$"))
    {
        Console.WriteLine($"Price detected: {block.Text} (Confidence: {block.Confidence}%)");
    }
}

Dim result As OcrResult = ocr.Read(inputPhoto)
Dim text As String = result.Text
Console.WriteLine(text)
Console.WriteLine($"Overall Confidence: {result.Confidence}%")

' Check confidence for individual elements
For Each word In result.Words
    If word.Confidence < 80 Then
        Console.WriteLine($"Low confidence word: '{word.Text}' ({word.Confidence}%)")
    End If
Next

' Validate numeric values
For Each block In result.Blocks
    If block.Text.Contains("$") Then
        Console.WriteLine($"Price detected: {block.Text} (Confidence: {block.Confidence}%)")
    End If
Next

using var inputPhoto = new OcrInput();
inputPhoto.LoadImage("receipt.jpg");

// Basic preprocessing
inputPhoto.DeNoise();           // Removes noise from the image
inputPhoto.ToGrayScale();       // Converts image to grayscale
inputPhoto.Contrast(1.5);       // Enhance contrast for faded receipts
inputPhoto.Sharpen();           // Improve text clarity

// Advanced preprocessing for challenging receipts
inputPhoto.Rotate(2.5);         // Correct slight rotation
inputPhoto.Deskew();            // Automatically straighten receipt
inputPhoto.Scale(200);          // Upscale low-resolution images

// Handle specific receipt issues
if (receiptIsDamaged)
{
    inputPhoto.Dilate();        // Thicken thin text
    inputPhoto.Erode();         // Reduce text bleeding
}

// For colored or patterned backgrounds
inputPhoto.Binarize();          // Convert to pure black and white
inputPhoto.Invert();            // Handle white text on dark background