Defining the whitelist of characters

Limiting a subset of characters instead of using the full set can greatly improve recognition accuracy, increase speed, and reduce resource consumption. A list of characters can be automatically identified from an image using the built-in Aspose.OCR for Python via .NET mechanisms.

You can specify a list of characters Aspose.OCR for Python via .NET engine will look for in allowed_symbols property of recognition settings. The characters are provided as a case-sensitive string.

Characters that do not match the provided list are ignored.

# Instantiate Aspose.OCR API
api = AsposeOcr()
# Add image to the recognition batch
input = OcrInput(InputType.SINGLE_IMAGE)
input.add("source.png")
# Limit a subset of recognized characters
recognitionSettings = RecognitionSettings()
recognitionSettings.allowed_symbols = "AÁBCDEÉFG12345"
# Recognize the image
result = api.recognize(input, recognitionSettings)
# Print recognition result
print(result[0].recognition_text)
input("Press Enter to continue...")