OCR Image Optimization Filters

VBC#

using IronOcr;
using System;

var ocrTesseract = new IronTesseract();
using var ocrInput = new OcrInput();
// First load all image(s)
ocrInput.LoadImage(@"images\image.png");

// Note: You don't need all of them; most users only need Deskew() and occasionally DeNoise()
ocrInput.WithTitle("My Document");
ocrInput.Binarize();
ocrInput.Contrast();
ocrInput.Deskew();
ocrInput.DeNoise();
ocrInput.Despeckle();
ocrInput.Dilate();
ocrInput.EnhanceResolution(300);
ocrInput.Invert();
ocrInput.Rotate(90);
ocrInput.Scale(150);
ocrInput.Sharpen();
ocrInput.ToGrayScale();
ocrInput.Erode();

// WIZARD - If you are unsure use the debug-wizard to test all combinations:
string codeToRun = OcrInputFilterWizard.Run(@"images\image.png", out double confidence, ocrTesseract);
Console.WriteLine(codeToRun);

// Optional: Export modified images so you can view them.
foreach (var page in ocrInput.GetPages())
{
    page.SaveAsImage($"filtered_{page.Index}.bmp");
}

var ocrResult = ocrTesseract.Read(ocrInput);
Console.WriteLine(ocrResult.Text);

Imports IronOcr
Imports System

Dim ocrTesseract = New IronTesseract()
Using ocrInput = New OcrInput()
    ' First load all image(s)
    ocrInput.LoadImage("images\image.png")

    ' Note: You don't need all of them; most users only need Deskew() and occasionally DeNoise()
    ocrInput.WithTitle("My Document")
    ocrInput.Binarize()
    ocrInput.Contrast()
    ocrInput.Deskew()
    ocrInput.DeNoise()
    ocrInput.Despeckle()
    ocrInput.Dilate()
    ocrInput.EnhanceResolution(300)
    ocrInput.Invert()
    ocrInput.Rotate(90)
    ocrInput.Scale(150)
    ocrInput.Sharpen()
    ocrInput.ToGrayScale()
    ocrInput.Erode()

    ' WIZARD - If you are unsure use the debug-wizard to test all combinations:
    Dim codeToRun As String = OcrInputFilterWizard.Run("images\image.png", confidence:=Nothing, ocrTesseract)
    Console.WriteLine(codeToRun)

    ' Optional: Export modified images so you can view them.
    For Each page In ocrInput.GetPages()
        page.SaveAsImage($"filtered_{page.Index}.bmp")
    Next

    Dim ocrResult = ocrTesseract.Read(ocrInput)
    Console.WriteLine(ocrResult.Text)
End Using

PM > Install-Package IronOcr

Install-Package IronOcr

OCR Image Optimization Filters

The OcrInput class provides granular control to C# and .NET developers to preprocess image input for speed and accuracy before OCR processing. This negates the common practice of using Photoshop Batch Scripts or ImageMagick to prepare images for OCR.