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Aspose.OCR for .NET 22.12.0 - Release Notes

This article contains a summary of recent changes, enhancements and bug fixes in Aspose.OCR for .NET 22.12.0 (December 2022) release.

GPU version: 21.6.0

What was changed

Key	Summary	Category
OCRNET-608	Added ID card recognition.	New feature
OCRNET-609	Added passport recognition.	New feature
OCRNET-606	Added vehicle license plate recognition.	New feature
OCRNET-610	Added invoice recognition.	New feature
OCRNET-617	Added methods for comparing image texts.	New feature
OCRNET-618	Added a method for searching for a fragment of text in an image.	New feature
OCRNET-619	Added a method to match image text with a regular expression.	New feature
OCRNET-621	The first line is missing when saving OCR results as a searchable PDF file.	Fix

Public API changes and backwards compatibility

This section lists all public API changes introduced in Aspose.OCR for .NET 22.12.0 that may affect the code of existing applications.

Added public APIs:

The following public APIs have been introduced in this release:

`RecognizeIDCard`

This method extracts content from an ID card provided as an image file or as a MemoryStream object.

`IDCardRecognitionSettings`

An object containing recognition settings which is specifically tailored for ID card recognition.

`RecognizePassport`

This method extracts content from a passport provided as an image files or as a MemoryStream object.

`PassportRecognitionSettings`

An object containing recognition settings which is specifically tailored for passport recognition.

`RecognizeCarPlate`

This method extracts content from a vehicle license plate provided as an image file or as a MemoryStream object.

`CarPlateRecognitionSettings`

An object containing recognition settings which is specifically tailored for vehicle license plate recognition.

`RecognizeInvoice`

This method extracts content from an invoice provided as an image file or as a MemoryStream object.

`InvoiceRecognitionSettings`

An object containing recognition settings which is specifically tailored for invoice recognition.

`CompareImageTexts`

This method checks if two images contain the same text (case sensitive or case insensitive).

`ImageTextDiff`

This method compares the texts on the two images and returns a number representing how similar they are.

The text distance is returned as a floating point value from 0 to 1 indicating the percentage of similarity between texts. 0 means that the texts are completely different and 1 (100%) means the texts are identical.

`ImageHasText`

This method checks if the image contains the provided text fragment. The text can be represented as a case-sensitive or case-insensitive string, or as a regular expression object.

Updated public APIs:

No changes.

Removed public APIs:

No changes.

Usage examples

The examples below illustrates the changes introduced in this release:

Recognize ID card

Aspose.OCR.AsposeOcr recognitionEngine = new Aspose.OCR.AsposeOcr();
Aspose.OCR.IDCardRecognitionSettings recognitionSettings = new Aspose.OCR.IDCardRecognitionSettings();
recognitionSettings.Language = Aspose.OCR.Language.Ukr;
Aspose.OCR.RecognitionResult result = recognitionEngine.RecognizeIDCard("id-card.jpg", recognitionSettings);
Console.WriteLine(result.RecognitionText);

Recognize passport

Aspose.OCR.AsposeOcr recognitionEngine = new Aspose.OCR.AsposeOcr();
Aspose.OCR.PassportRecognitionSettings recognitionSettings = new Aspose.OCR.PassportRecognitionSettings();
recognitionSettings.Language = Aspose.OCR.Language.Ukr;
Aspose.OCR.RecognitionResult result = recognitionEngine.RecognizePassport("passport.jpg", recognitionSettings);
Console.WriteLine(result.RecognitionText);

Recognize vehicle license plate

Aspose.OCR.AsposeOcr recognitionEngine = new Aspose.OCR.AsposeOcr();
Aspose.OCR.CarPlateRecognitionSettings recognitionSettings = new Aspose.OCR.CarPlateRecognitionSettings();
Aspose.OCR.RecognitionResult result = recognitionEngine.RecognizeCarPlate("car.jpg", recognitionSettings);
Console.WriteLine(result.RecognitionText);

Recognize invoice

Aspose.OCR.AsposeOcr recognitionEngine = new Aspose.OCR.AsposeOcr();
Aspose.OCR.InvoiceRecognitionSettings recognitionSettings = new Aspose.OCR.InvoiceRecognitionSettings();
recognitionSettings.Language = Aspose.OCR.Language.Ukr;
Aspose.OCR.RecognitionResult result = recognitionEngine.RecognizeInvoice("invoice.jpg", recognitionSettings);
Console.WriteLine(result.RecognitionText);

Compare two images

Aspose.OCR.AsposeOcr recognitionEngine = new Aspose.OCR.AsposeOcr();
Aspose.OCR.RecognitionSettings recognitionSettings = new Aspose.OCR.RecognitionSettings();
recognitionSettings.AutoDenoising = true;
// case-insensitive comparison of image texts
if(!recognitionEngine.CompareImageTexts("image1.png", "image2.png", recognitionSettings, true))
{
	Console.WriteLine("Images contain the same text");
}
// percentage of similarity between texts
else
{
	float distance = recognitionEngine.ImageTextDiff("image1.png", "image2.png", recognitionSettings, true);
	Console.WriteLine($"The image texts are {distance*100}% similar");
}

Find text on image

Aspose.OCR.AsposeOcr recognitionEngine = new Aspose.OCR.AsposeOcr();
Aspose.OCR.RecognitionSettings recognitionSettings = new Aspose.OCR.RecognitionSettings();
recognitionSettings.Language = Aspose.OCR.Language.Ukr;
if(recognitionEngine.ImageHasText("source.png", "Aspose", recognitionSettings))
{
	Console.WriteLine(@"The image contains the word ""Aspose""");
}
else
{
	Console.WriteLine(@"The image doesn't contain the word ""Aspose""");
}