An image processing device is disclosed which can reliably detect documents which may not be copied, which has a very small probability of false positives, and which can handle newly issued documents which may not be copied. In addition, an image processing scheme is disclosed which would accurately...http://www.google.com.au/patents/US6289125?utm_source=gb-gplus-sharePatent US6289125 - Image processing device and method for indentifying an input image, and copier scanner and printer including same
