Aspose.OCR for .NET 23.2.0 - Release Notes

What was changed

Public API changes and backwards compatibility

This section lists all public API changes introduced in Aspose.OCR for .NET 23.2.0 that may affect the code of existing applications.

Added public APIs:

The following public APIs have been introduced in this release:

PreprocessingFilter.AutoDewarping()

Aspose.OCR for the .NET API has been extended with PreprocessingFilter.AutoDewarping() image preprocessing method that straightens severely curved and distorted images such as photographed pages from books, magazines, and the like. Such images are almost impossible to read by standard recognition algorithms.

Important considerations

• It is highly recommended to use DetectAreasMode.CURVED_TEXT areas detection mode to extract text from the dewarped image. Other area detection modes may produce inaccurate results.
• Automatic skew correction must be turned off. Its combination with dewarping may result in severe image distortion.
• Due to the high complexity of the underlying neural network, dewarping requires significant system resources.

Updated public APIs:

No changes.

Removed public APIs:

No changes.

Usage examples

The examples below illustrates the changes introduced in this release:

Correct geometric distortions

Aspose.OCR.AsposeOcr recognitionEngine = new Aspose.OCR.AsposeOcr();
// Add dewarping filter
Aspose.OCR.Models.PreprocessingFilters.PreprocessingFilter filters = new Aspose.OCR.Models.PreprocessingFilters.PreprocessingFilter();
filters.Add(Aspose.OCR.Models.PreprocessingFilters.PreprocessingFilter.AutoDewarping());
// Save preprocessed image to file for debugging purposes
using(MemoryStream ms = recognitionEngine.PreprocessImage("source.png", filters))
{
	using(FileStream fs = new FileStream("result.png", FileMode.Create, FileAccess.Write))
	{
		ms.WriteTo(fs);
	}
}
// Append preprocessing filters to recognition settings
Aspose.OCR.RecognitionSettings recognitionSettings = new Aspose.OCR.RecognitionSettings();
recognitionSettings.DetectAreasMode = Aspose.OCR.DetectAreasMode.CURVED_TEXT;
recognitionSettings.PreprocessingFilters = filters;
// Recognize image
Aspose.OCR.RecognitionResult result = recognitionEngine.RecognizeImage("source.png", recognitionSettings);
Console.WriteLine(result.RecognitionText);

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