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OCR a Region of an Image
using IronOcr;
using IronSoftware.Drawing;
using System;

var ocrTesseract = new IronTesseract();

using var ocrInput = new OcrInput();
// A 41% improvement on speed by specifiying a pixel region
var ContentArea = new Rectangle(x: 215, y: 1250, width: 1335, height: 280);
ocrInput.LoadImage("img/example.png", ContentArea);

var ocrResult = ocrTesseract.Read(ocrInput);
Console.WriteLine(ocrResult.Text);
Imports IronOcr
Imports IronSoftware.Drawing
Imports System

Dim ocrTesseract = New IronTesseract()

Using ocrInput = New OcrInput()
    ' A 41% improvement on speed by specifiying a pixel region
    Dim ContentArea = New Rectangle(x:=215, y:=1250, width:=1335, height:=280)
    ocrInput.LoadImage("img/example.png", ContentArea)

    Dim ocrResult = ocrTesseract.Read(ocrInput)
    Console.WriteLine(ocrResult.Text)
End Using
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OCR a Region of an Image

OCR a Region of an Image

This example demonstrates how to improve OCR speed by choosing a specific area of an image to perform OCR (Optical Character Recognition) in .NET. These are called ContentAreas or CropAreas.

Discover How to Use Input Images with IronOCR
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Install with NuGet

Version: 2026.10

PM > Install-Package IronOcr
nuget.org/packages/IronOcr/
  1. In Solution Explorer, right-click References, Manage NuGet Packages
  2. Select Browse and search "IronOCR"
  3. Select the package and install
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Download DLL

Version: 2026.10

or download Windows Installer here.

  1. Download and unzip IronOCR to a location such as ~/Libs within your Solution directory
  2. In Visual Studio Solution Explorer, right click References. Select Browse, "IronOCR.dll"

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