OCR Image Optimization Filters
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);
NuGet Download
PM > Install-Package IronOcr
OCR Image Optimization Filters

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.

How to Use OCR Filter in Tesseract Alternatively

  1. Install an OCR library to use OCR Filter
  2. Create a OcrInput object using the image path
  3. (optional) Process the image using filter methods.
  4. Use the Read method.
  5. Display the result using the OcrResult's Text property.

Below is an example demonstrating how to use the OcrInput class in C# with IronOCR:

Enhance Image Quality for OCR with Our Guide
View on GitHub

Ready to Get Started?

Nuget Downloads 6,337,990Version:2026.10just released

Free NuGet Download
Total downloads: 6,337,990