Aspose.OCR for .NET 22.9 - Release Notes

What was changed

Key Summary Category
OCRNET-569 Extracting text from receipts. New feature
OCRNET-572 Added a recognition setting that improves the recognition of small fonts and detection of dense lines. New feature
OCRNET-573 Improved handling of images rotated by 90 degrees. Enhancement
OCRNET-580 The original font size is preserved in OCR results saved in PDF and DOCX formats. New feature
n/a Added support for universal recognition of all supported Cyrillic languages. Enhancement
n/a Removed unnecessary RecognizeSingleLine option from DocumentRecognitionSettings. Enhancement
n/a Changed output of RecognizeMultipleImages method from array to List<Aspose.OCR.RecognitionResult> for compatibility with other API methods. Enhancement

Public API changes and backwards compatibility

This section lists all public API changes introduced in Aspose.OCR for .NET 22.9 that may affect the code of existing applications.

Added public APIs:

The following public APIs have been introduced in this release:

Receipt recognition.

Added a method RecognizeReceipt that is specifically tailored for extracting text from printed receipts.

This method uses a special recognition settings object, ReceiptRecognitionSettings, which is a subset of the existing image recognition settings.

Recognition of small fonts

Added the UpscaleSmallFont image recognition setting, which greatly improves small font recognition and line detection.

New recognition languages

Added new recognition languages:

  • Aspose.OCR.Language.Latin - all Extended Latin characters, including diacritics.
    This is an alias for Aspose.OCR.Language.None.
  • Aspose.OCR.Language.Cyrillic - all Cyrillic characters.

Updated public APIs:

The following public APIs have been updated in this release:

RecognizeMultipleImages

To make the RecognizeMultipleImages compatible with related methods such as SaveMultipageDocument, the output type of the method is changed to List<Aspose.OCR.RecognitionResult>.

New recognition languages

Added the following universal language aliases:

  • Aspose.OCR.Language.Latin - Extended Latin characters, including diacritics.
  • Aspose.OCR.Language.Cyrillic - Cyrillic characters.

Removed public APIs:

The following public APIs have been removed in this release:

RecognizeSingleLine option of DocumentRecognitionSettings

The RecognizeSingleLine option of DocumentRecognitionSettings is not applicable for multipage documents and has been removed in this release to simplify the API. However, if you provide this option in your code, you must remove it so that the program can be built.

Usage examples

The examples below illustrates the changes introduced in this release:

Receipt recognition.

Aspose.OCR.AsposeOcr recognitionEngine = new Aspose.OCR.AsposeOcr();
Aspose.OCR.ReceiptRecognitionSettings recognitionSettings = new Aspose.OCR.ReceiptRecognitionSettings();
recognitionSettings.Language = Aspose.OCR.Language.Ukr;
Aspose.OCR.RecognitionResult result = recognitionEngine.RecognizeReceipt("receipt.png", recognitionSettings);
Console.WriteLine(result.RecognitionText);

Recognition of small fonts

Aspose.OCR.AsposeOcr recognitionEngine = new Aspose.OCR.AsposeOcr();
Aspose.OCR.RecognitionSettings recognitionSettings = new Aspose.OCR.RecognitionSettings();
recognitionSettings.UpscaleSmallFont = true;
Aspose.OCR.RecognitionResult result = recognitionEngine.RecognizeImage("source.png", recognitionSettings);
Console.WriteLine(result.RecognitionText);

Recognize all Cyrillic characters

Aspose.OCR.AsposeOcr recognitionEngine = new Aspose.OCR.AsposeOcr();
Aspose.OCR.RecognitionSettings recognitionSettings = new Aspose.OCR.RecognitionSettings();
recognitionSettings.Language = Aspose.OCR.Language.Cyrillic;
Aspose.OCR.RecognitionResult result = recognitionEngine.RecognizeImage("source.png", recognitionSettings);
Console.WriteLine(result.RecognitionText);

Batch recognition

Aspose.OCR.AsposeOcr recognitionEngine = new Aspose.OCR.AsposeOcr();
Aspose.OCR.RecognitionSettings recognitionSettings = new Aspose.OCR.RecognitionSettings();
// Recognize all images from the folder
List<Aspose.OCR.RecognitionResult> results = recognitionEngine.RecognizeMultipleImages("C:/images/", recognitionSettings);
// Save all pages as PDF
Aspose.OCR.AsposeOcr.SaveMultipageDocument("result.pdf", Aspose.OCR.SaveFormat.Pdf, results);
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