OCR Image Optimization Filters

The OcrInput class provides granular control to C# and .Net developers to preprocess image input for speed and accuracy before.

This negates the common practice of using Photoshop Batch Scripts or ImageMagick to prepare images for OCR.

C#:

using IronOcr;

var Ocr = new IronTesseract();
using (var Input = new OcrInput(@"images\image.png"))
{
    Input.WithTitle("My Document");
    Input.Binarize();
    Input.Contrast();
    Input.Deskew();
    Input.DeNoise();
    Input.Dilate();
    Input.EnhanceResolution(300);
    Input.Invert();
    Input.Rotate(90);
    Input.Scale(150); // or Input.Scale(3000, 2000);
    Input.Sharpen();
    Input.ToGrayScale();

    // you don't need all of them
    // most users only need Deskew() and occasionally DeNoise() 


    // Optional: Export modified images so you can view them.
    foreach(var page in  Input.Pages){
          page.SaveAsImage("filtered.bmp")
    }


    var Result = Ocr.Read(Input);
    Console.WriteLine(Result.Text);
}

VB:

Imports IronOcr

Private Ocr = New IronTesseract()
Using Input = New OcrInput("images\image.png")
    Input.WithTitle("My Document")
    Input.Binarize()
    Input.Contrast()
    Input.Deskew()
    Input.DeNoise()
    Input.Dilate()
    Input.EnhanceResolution(300)
    Input.Invert()
    Input.Rotate(90)
    Input.Scale(150) ' or Input.Scale(3000, 2000);
    Input.Sharpen()
    Input.ToGrayScale()

    ' you don't need all of them
    ' most users only need Deskew() and occasionally DeNoise() 


    ' Optional: Export modified images so you can view them.
    For Each page In Input.Pages
          page.SaveAsImage("filtered.bmp")
    Next page


    Dim Result = Ocr.Read(Input)
    Console.WriteLine(Result.Text)
End Using