Receipt recognition settings

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

These settings are applicable when extracting text from scanned receipts in JPEG, PNG, TIFF, BMP, and GIF formats.

Method Parameter Default state Description
setAllowedCharacters Case-sensitive string of characters or one of the predefined character sets:
  • CharactersAllowedType.ALL - try to recognize all characters.
  • CharactersAllowedType.LATIN_ALPHABET - only recognize case-insensitive Latin / English text (A to Z and a to z), without accented characters.
  • CharactersAllowedType.DIGITS - recognize only binary, octal, decimal, or hexadecimal numbers (0-9 and A to F).
 All characters from the selected recognition language. The whitelist of characters Aspose.OCR engine will look for.
setAutoSkew
  • true - enable
  • false - disable
 Enabled Automatically correct image tilt (deskew) before proceeding to recognition.
setIgnoredCharacters Case-sensitive string of characters All characters are recognized A blacklist of characters that are ignored during recognition.
setLanguage Recognition language Extended Latin characters, including diacritics Specify a language for recognition.
setPreprocessingFilters Image preprocessing filter None Apply image processing filters that enhance an image before it is sent to the OCR engine.
setThreadsCount Number of threads, int Automatic The number of CPU threads used for recognition.
setUpscaleSmallFont
  • true - enable
  • false - disable
 Disabled Improve small font recognition and detection of dense lines.

Applicable to

Example

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

// Create instance of OCR API
AsposeOCR api = new AsposeOCR();
// Specify recognition settings
ReceiptRecognitionSettings recognitionSettings = new ReceiptRecognitionSettings();
recognitionSettings.setLanguage(Language.Fra);
recognitionSettings.setThreadsCount(2);
// Extract text from receipt
RecognitionResult result = api.RecognizeReceipt("receipt.png", recognitionSettings);
System.out.println("Recognition result:\n" + result.recognitionText + "\n\n");
Multi-page document recognition settings