Defining the blacklist of characters

Image defects such as dirt and scratches may cause recognition errors. For example, dots or other print defects next to letters can be incorrectly recognized as punctuation or diacritical marks.

To ignore certain characters during recognition, provide them in IgnoredSymbols property of recognition settings as a case-sensitive string:

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");
// Limit a subset of recognized characters
Aspose.OCR.RecognitionSettings recognitionSettings = new Aspose.OCR.RecognitionSettings();
recognitionSettings.IgnoredSymbols = "Áá";
// Recognize image
Aspose.OCR.OcrOutput results = recognitionEngine.Recognize(input, recognitionSettings);
foreach(Aspose.OCR.RecognitionResult result in results)
{
	Console.WriteLine(result.RecognitionText);
}