Handling Slashed Zeros in IronOCR

Curtis Chau

Updated:July 5, 2026

Slashed zeros are not recognized correctly, identified as g, 6 or 8?

This can be an issue with the Tesseract language packs.

The following language pack may help to address this issue with slashed zeros:
SlashedZeroOCR

This can then be used with the IronOCR feature to load custom language packs:
Custom Language Example in IronOCR

// Import the IronOcr namespace
using IronOcr;

class Program
{
    static void Main(string[] args)
    {
        // Initialize IronTesseract class
        var Ocr = new IronTesseract();

        // Use a custom Tesseract language file, which may help with recognizing slashed zeros
        Ocr.UseCustomTesseractLanguageFile("custom_tesseract_files/custom.traineddata");

        // Specify the OCR input image
        using (var Input = new OcrInput())
        {
            // Load the image into the OCR input
            Input.LoadImage(@"images\image.png");

            // Perform OCR on the input image
            var Result = Ocr.Read(Input);

            // Output the recognized text to the console
            Console.WriteLine(Result.Text);
        }
    }
}

// Import the IronOcr namespace
using IronOcr;

class Program
{
    static void Main(string[] args)
    {
        // Initialize IronTesseract class
        var Ocr = new IronTesseract();

        // Use a custom Tesseract language file, which may help with recognizing slashed zeros
        Ocr.UseCustomTesseractLanguageFile("custom_tesseract_files/custom.traineddata");

        // Specify the OCR input image
        using (var Input = new OcrInput())
        {
            // Load the image into the OCR input
            Input.LoadImage(@"images\image.png");

            // Perform OCR on the input image
            var Result = Ocr.Read(Input);

            // Output the recognized text to the console
            Console.WriteLine(Result.Text);
        }
    }
}

Imports IronOcr

Class Program
    Shared Sub Main(args As String())
        ' Initialize IronTesseract class
        Dim Ocr As New IronTesseract()

        ' Use a custom Tesseract language file, which may help with recognizing slashed zeros
        Ocr.UseCustomTesseractLanguageFile("custom_tesseract_files/custom.traineddata")

        ' Specify the OCR input image
        Using Input As New OcrInput()
            ' Load the image into the OCR input
            Input.LoadImage("images\image.png")

            ' Perform OCR on the input image
            Dim Result = Ocr.Read(Input)

            ' Output the recognized text to the console
            Console.WriteLine(Result.Text)
        End Using
    End Sub
End Class

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Curtis Chau

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Technical Writer

Curtis Chau holds a Bachelor’s degree in Computer Science (Carleton University) and specializes in front-end development with expertise in Node.js, TypeScript, JavaScript, and React. Passionate about crafting intuitive and aesthetically pleasing user interfaces, Curtis enjoys working with modern frameworks and creating well-structured, visually appealing manuals.

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