Visible authentication patterns for printed document
First Claim
1. A method of determining whether an analog form of an object is an original analog form, the method comprising:
- comparing at least a portion of a digital recording made from the analog form, the analog form having an authentication pattern, with an original digital representation of the portion to determine a degree of dissimilarity between the recorded portion and the original digital representation of the portion; and
using the degree of dissimilarity to determine whether the analog form is an original analog form;
wherein the authentication pattern depends on a key and other information, the other information being displayed on the analog form; and
reading a bar code or reading a watermark or using OCR to extract the other information from the analog form, the key is generated on which the authentication pattern depends from the extracted other information, and the original digital representation is generated in dependence on the key.
3 Assignments
0 Petitions
Accused Products
Abstract
A technique for determining authenticity of analog forms such as packaging or documents determines whether the analog form has been made directly from a digital representation or by photocopying or scanning an analog form. The technique makes the determination by comparing an original digital representation of a portion of the analog form having an authentication pattern with a digital recording of the portion from the analog form and measuring differences in features that are affected by the operations of photocopying or scanning. The authentication pattern may depend on a key or on other information displayed on the analog form. Another pattern may be displayed on the analog form to locate the pattern.
126 Citations
13 Claims
-
1. A method of determining whether an analog form of an object is an original analog form, the method comprising:
-
comparing at least a portion of a digital recording made from the analog form, the analog form having an authentication pattern, with an original digital representation of the portion to determine a degree of dissimilarity between the recorded portion and the original digital representation of the portion; and using the degree of dissimilarity to determine whether the analog form is an original analog form; wherein the authentication pattern depends on a key and other information, the other information being displayed on the analog form; and reading a bar code or reading a watermark or using OCR to extract the other information from the analog form, the key is generated on which the authentication pattern depends from the extracted other information, and the original digital representation is generated in dependence on the key. - View Dependent Claims (2, 3, 4, 5)
-
-
6. A method of determining whether an analog form of an object is an original analog form, the method comprising:
-
comparing at least a portion of a digital recording made from the analog form, the analog form having an authentication pattern, with an original digital representation of the portion to determine a degree of dissimilarity between the recorded portion and the original digital representation of the portion; using the degree of dissimilarity to determine whether the analog form is an original analog form; and using another pattern displayed on the analog form to locate the authentication pattern; wherein the authentication pattern depends on a key and other information, the other information being displayed on the analog form; and reading a bar code or reading a watermark or using OCR to extract the other information from the analog form, the key being generated on which the authentication pattern depends from the extracted other information, and the original digital representation being generated in dependence on the key. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13)
-
Specification