Aspose.OCR Image Text Finder for .NET

The Aspose.OCR Image Text Finder for .NET enables developers to search for text in single raster images and compare text between two images. The licensed plugin scope is limited to the text-search and image-text comparison APIs listed below.

Installation and Setup

Getting started takes just a few steps:

  1. Install the Aspose.OCR package from NuGet or download the distributive. See the Installation Guide .
  2. Configure metered licensing before any OCR operations. Use the Metered Licensing instructions to apply the licensed plugin functionality.
  3. Reference the Aspose.OCR namespace in your .NET project.

Supported Plugin Options

The plugin license enables these API capabilities:

API areaSupported options
Licensed methodsImageHasText, ImageTextDiff, CompareImageTexts
Input typeInputType.SingleImage
Area detection modesDetectAreasMode.TABLE, DetectAreasMode.CURVED_TEXT, DetectAreasMode.LEAN, DetectAreasMode.MULTICOLUMN, DetectAreasMode.UNIVERSAL
Search optionsString search with optional ignoreCase; regular expression search with Regex; text similarity through CompareImageTexts; text difference score through ImageTextDiff
PreprocessingAutoSkewFilter through the autoSkew argument on supported text-search APIs
Language selectionRecognitionSettings.Language supports 154 Language enum values, including Auto, Multilanguage, and Universal
Common public recognition settingsRecognizeSingleLine, UpscaleSmallFont, LinesFiltration, ThreadsCount, AutomaticColorInversion
Plugin license restrictionCustom RecognitionAreas are not included; keep RecognitionAreas empty

General preprocessing filter pipelines, vector image input, PDF input, multipage input, export formats, font extraction, visual diff overlays, and table/form recognition APIs are not listed for this plugin in the license service.

Supported Workflow

Use a single image file path with ImageHasText, ImageTextDiff, or CompareImageTexts. Pass RecognitionSettings when you need a supported DetectAreasMode, threading, line filtering, single-line recognition, small-font upscaling, or automatic color inversion.

Example: Search Text in an Image 

Aspose.OCR.Metered metered = new Aspose.OCR.Metered();
metered.SetMeteredKey("PublicKey", "PrivateKey");

// Create AsposeOCR engine
Aspose.OCR.AsposeOcr recognitionEngine = new Aspose.OCR.AsposeOcr();

// Load source image
string img1 = "source1.png";
Aspose.OCR.RecognitionSettings recognitionSettings = new Aspose.OCR.RecognitionSettings();

// Search for text string in the image
bool isFound = recognitionEngine.ImageHasText(img1, "Aspose", recognitionSettings);
Console.WriteLine(isFound);

Output and Result Handling

Image Text Finder APIs return search and comparison results, such as a Boolean match result, a text difference score, or comparison data between two images. They do not return an OCR document output, so SaveFormat-based document saving with RecognitionResult.Save(...) or OcrOutput.Save(...) does not apply to this plugin.

If you need to export recognized content to Text, Pdf, Docx, Xlsx, Json, Xml, HTML, EPUB, RTF, HOCR, Md, or Csv, use one of the recognition plugins that returns RecognitionResult or OcrOutput.

Tips and Best Practices

  • Pre-analyze image DPI and quality for optimal recognition.
  • Use regex searches sparingly on very large sets.
  • Use autoSkew for skewed images when calling APIs that expose this argument.
  • Set ThreadsCount to 1 on low-powered machines to reduce CPU pressure; increase ThreadsCount on multi-core systems to speed up repeated comparisons.
  • Always update to the latest version for improved recognition models.

Explore Free Online Tool

Test the functionality instantly using the Aspose.OCR Image Text Finder App . No installation or coding required.

Conclusion

The Aspose.OCR Image Text Finder for .NET Plugin is a focused solution for image text search and image text comparison with the licensed APIs listed above.

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