.NET OCR API to Optical Character Recognition

Getting Started with Aspose.OCR for .NET

The recommend way to install Aspose.OCR for .NET is using NuGet. Please use the following command for a smooth installation.

 Install-Package Aspose.OCR

Detect Particular Area of an Image via C#

Aspose.OCR for .NET has provided the capability to detect a particular area in the image inside .NET applications. A scanned text image or photograph may encompass text paragraphs, tables, illustrations, formulas, and more. Detecting, ordering, and classifying areas of interest on a page is the cornerstone of successful and accurate OCR. To achieve the task there are several document areas detection algorithms part of the library helping software developers to detect a particular type of content. The following shows how to load an image and detect a particular area for text recognition using C# commands.

Aspose.OCR.AsposeOcr recognitionEngine = new Aspose.OCR.AsposeOcr();
// Add an image to OcrInput object
Aspose.OCR.OcrInput input = new Aspose.OCR.OcrInput(Aspose.OCR.InputType.SingleImage);
input.Add("source.png");
// Set document areas detection mode
Aspose.OCR.RecognitionSettings recognitionSettings = new Aspose.OCR.RecognitionSettings();
recognitionSettings.DetectAreasMode = Aspose.OCR.DetectAreasMode.DOCUMENT;
// Recognize image
List results = recognitionEngine.Recognize(input, recognitionSettings);
foreach(Aspose.OCR.RecognitionResult result in results)
{
	Console.WriteLine(result.RecognitionText);
}

Process Images via .NET API

Aspose.OCR for .NET allows software developers to perform different types of operations on images inside their own .NET applications. The library has included several fully automated and manual image processing filters that help users to enhance their images before performing the OCR operations, such as Skew correction, Rotation, Noise removal, Contrast correction, Resizing, Binarization, Conversion to grayscale, Color inversion, Dilation, Median filter and many more. There are many other options and settings that you can use to customize the OCR process. For improving the image recognition quality developers can apply multiple processing filters. Developers can easily apply numerous filters to specific regions of an image.

Aspose.Drawing.Rectangle blackRectangle = new Aspose.Drawing.Rectangle(5, 161, 340, 113);
Aspose.OCR.Models.PreprocessingFilters.PreprocessingFilter filters = new Aspose.OCR.Models.PreprocessingFilters.PreprocessingFilter();
// (1) Invert black region
filters.Add(Aspose.OCR.Models.PreprocessingFilters.PreprocessingFilter.Invert(blackRectangle));
// (2) Denoise entire image
filters.Add(Aspose.OCR.Models.PreprocessingFilters.PreprocessingFilter.AutoDenoising());

Text Comparison in Images via .NET API

Aspose.OCR for .NET gives software developers the capability to compare text on two images inside their own C# applications. The library can compare texts on two images, regardless of the font, text size, case, styles, and colors. One way to compare images text by extracting text from the images and once you have extracted the text from the images, you can use any text comparison algorithm to compare them. Aspose.OCR for .NET provides a simple way to compare two strings using the String.Equals method. The following example t demonstrates how to compare text in two images using C# code.

 
using System;
using Aspose.OCR;
using System.Drawing;
 
class Program
{
    static void Main()
    {
        // Load the images
        var image1 = Image.FromFile("image1.png");
        var image2 = Image.FromFile("image2.png");
 
        // Extract text from the images
        var ocrEngine = new OcrEngine();
        ocrEngine.Image = ImageStream.FromImage(image1);
        ocrEngine.Process();
        var text1 = ocrEngine.Text;
 
        ocrEngine.Image = ImageStream.FromImage(image2);
        ocrEngine.Process();
        var text2 = ocrEngine.Text;
 
        // Compare the extracted text
        var areEqual = string.Equals(text1, text2, StringComparison.OrdinalIgnoreCase);
        Console.WriteLine("Are the texts equal? " + areEqual);
    }
}
//Note that the above code only works for exact text matches. 

Search Text in An Image using C# API

Aspose.OCR for .NET makes it easy for software developers to find text in an image inside their own .NET applications. The library has provided support for searching text in images as easy as finding the text fragment in a string. The library supports searching for a case-sensitive or case-insensitive string, and even validates an image text against a pattern. Software developers can use the ImageHasText method to search text inside an image with just a couple of lines of C# code. The following example shows how to load an image and search a particular text inside it.

Aspose.OCR.AsposeOcr recognitionEngine = new Aspose.OCR.AsposeOcr();
Aspose.OCR.RecognitionSettings recognitionSettings = new Aspose.OCR.RecognitionSettings();
recognitionSettings.Language = Aspose.OCR.Language.Ukr;
if(recognitionEngine.ImageHasText("source.png", "Aspose", recognitionSettings))
{
	Console.WriteLine(@"The image contains the word ""Aspose""");
}
else
{
	Console.WriteLine(@"The image doesn't contain the word ""Aspose""");
}