초록 ▼

Techniques for determining authenticity of analog forms such as packaging or documents (117). One of the techniques determines whether the analog form has been made directly from a digital representation (903) or by photocopying or scanning an analog form. The technique makes the determination by co

Techniques for determining authenticity of analog forms such as packaging or documents (117). One of the techniques determines whether the analog form has been made directly from a digital representation (903) or by photocopying or scanning an analog form. The technique makes the determination by comparing (911) an original digital representation of a portion of the analog form with a digital recording (203) of the portion from the analog form and measuring differences in features that are affected by the operations of photocopying or scanning. The original digital representation (105) and the analog form may have a “noisy”, i.e., random or pseudo random pattern. Such noisy patterns may further be used for other authentication purposes, such as determining whether the portion of the analog form that has the noisy pattern has been altered and to carry hidden messages. The noisy pattern may carry a logo or may be. part or all of a barcode.

대표청구항 ▼

What is claimed is: 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 representatio

What is claimed is: 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; andusing the degree of dissimilarity to determine whether the analog form is an original analog form; andperforming a quality control of a printing process in dependence on the degree of dissimilarity;wherein the authentication pattern depends on a key and/or other information, the other information being displayed on the analog form.