Extracting text from passport images

To use this recognition method, install sparse text recognition model (aspose-ocr-text-in-wild-v1) in your project.

Automatic passport recognition and verification is a very common task in many areas: border control, banking, security, and so on. However, manually re-typing text is an error-prone and time-consuming process, and mistakes can lead to security breaches and other undesirable consequences.

Aspose.OCR offers a special recognition algorithm that extracts text from scanned or photographed passports, which can then be automatically saved to the database or automatically verified.

To extract text from a passport image, use RecognizePassport method of Aspose.OCR.AsposeOcr class.

This method allows you to customize recognition accuracy, performance, and other settings.

The method takes OcrInput object and returns a RecognitionResult object containing the passport data.

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);
input.Add("passport1.png");
input.Add("passport2.png");
// Recognize passports
Aspose.OCR.OcrOutput results = recognitionEngine.RecognizePassport(input);
foreach(Aspose.OCR.RecognitionResult result in results)
{
	Console.WriteLine(result.RecognitionText);
}

Extracting passport details

Besides recognizing passport text, this method is capable of extracting essential information from a passport image, like date of birth, names, and more. The specific details extracted depend on the passport’s origin, which is specified in the Country parameter of the recognition settings.

To retrieve the passport details, use the GetKeywords() method of the recognition results object. The information is returned as a dictionary with key-value pairs that are specific to each country.

Example

The following code snippet shows how to extract key details from US passport:

Aspose.OCR.AsposeOcr recognitionEngine = new Aspose.OCR.AsposeOcr();
// Add scanned passport to recognition batch
OcrInput passports = new OcrInput(InputType.SingleImage);
passports.Add("us_passport_sample.png");
// Explicitly specify that you are processing US passport
var recognitionSettings = new PassportRecognitionSettings();
recognitionSettings.Country = Aspose.OCR.Country.USA;
// Recognize passport
Aspose.OCR.OcrOutput results = recognitionEngine.RecognizePassport(passports, recognitionSettings);
// Parse passport data and output essential details along with image regions they were found in
var details = results[0].GetKeywords();
foreach (var item in details)
{
	Console.WriteLine($"{item.Key}: {item.Value.TextInLine}");
	Console.WriteLine($"Left: {item.Value.Line.X}; top: {item.Value.Line.Y}; size: {item.Value.Line.Width} x {item.Value.Line.Height}");
}