Passport recognition settings

Aspose.OCR for .NET allows for very flexible customization of passport recognition accuracy, performance, and other settings by configuring the properties of the PassportRecognitionSettings object.

These settings are specifically tailored for processing scanned or photographed passports.

Setting Type Default value Description
AllowedSymbols string All characters of the selected language The whitelist of characters Aspose.OCR engine will look for.
IgnoredSymbols string none A blacklist of characters that are ignored during recognition.
Language Aspose.OCR.Language Aspose.OCR.Language.None Specify a language for recognition.
ThreadsCount integer auto The number of CPU threads used for recognition.
AutomaticColorInversion boolean true Improve recognition accuracy of white text on a dark/black background. If you are not optimizing every aspect of recognition (for example, for online applications or entry-level devices), leave this setting set to true.
Country Aspose.OCR.Country NONE Extract key passport details (such as a number, name, date of birth, and so on) for the specific country in addition to the entire passport text.
See Supported countries section below.

Supported countries

A list of countries for retrieving specific details (such as a number, name, date of birth, and so on) from passport images:

Value Country
Aspose.OCR.Country.NONE Do not parse passport details (only recognize passport text).
Aspose.OCR.Country.MADAGASCAR Parse Malagasy passports.
Aspose.OCR.Country.USA Parse US passports.

Applicable to


The following code example shows how to fine-tune passport recognition:

Aspose.OCR.AsposeOcr recognitionEngine = new Aspose.OCR.AsposeOcr();
// Add images to OcrInput object
Aspose.OCR.OcrInput input = new Aspose.OCR.OcrInput(Aspose.OCR.InputType.SingleImage);
// Recognition settings
Aspose.OCR.PassportRecognitionSettings recognitionSettings = new Aspose.OCR.PassportRecognitionSettings();
recognitionSettings.Language = Aspose.OCR.Language.ExtLatin;
// Recognize passports
List<Aspose.OCR.RecognitionResult> results = recognitionEngine.RecognizePassport(input, recognitionSettings);
foreach(Aspose.OCR.RecognitionResult result in results)