Car plate recognition settings

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

These settings are specifically tailored for processing scanned or photographed vehicle license plates.

Setting	Type	Default value	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.
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.
setAutomaticColorInversion	boolean	true	Set the method parameter to true automatically detect white text on a dark/black background and use a special OCR algorithm to improve car license plate recognition accuracy. Call this method with the parameter set to “false” to explicitly disable inverted text detection to save resources.

Applicable to

• Extracting text from a car plate

Example

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

AsposeOCR api = new AsposeOCR();
// Add images to the recognition batch
OcrInput input  = new OcrInput(InputType.SingleImage);
input.add(os.path.join(self.dataDir, "car1.png"));
input.add(os.path.join(self.dataDir, "car2.png"));
// Recognition settings
CarPlateRecognitionSettings recognitionSettings = new CarPlateRecognitionSettings();
recognitionSettings.setIgnoredCharacters("Ää");
// Recognize license plates
ArrayList<RecognitionResult> results = api.RecognizeCarPlate(input, recognitionSettings);
results.forEach((result) -> {
	System.out.println(result.recognition_text);
});