Visible authentication patterns for printed document
First Claim
1. A method for use with an authenticator, the method comprising:
- creating an original digital pattern containing an authentication pattern;
producing at least one original analog form from the original digital pattern causing a first loss of information in the at least one original analog form;
making a digital recording from at least a portion of the at least one original analog form or from at least a portion of another analog form derived from the at least one original analog form causing a second loss of information in the recorded portion;
comparing using a computer the digital recording with a corresponding portion of the original digital pattern using the sum of the first and second loss of information to determine a degree of dissimilarity between the digital recording made from the portion and the corresponding portion of the original digital pattern; and
using the degree of dissimilarity to determine at said authenticator whether the recording was made from the at least one original analog form or from the other analog form.
4 Assignments
0 Petitions
Accused Products
Abstract
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.
120 Citations
27 Claims
-
1. A method for use with an authenticator, the method comprising:
-
creating an original digital pattern containing an authentication pattern; producing at least one original analog form from the original digital pattern causing a first loss of information in the at least one original analog form; making a digital recording from at least a portion of the at least one original analog form or from at least a portion of another analog form derived from the at least one original analog form causing a second loss of information in the recorded portion; comparing using a computer the digital recording with a corresponding portion of the original digital pattern using the sum of the first and second loss of information to determine a degree of dissimilarity between the digital recording made from the portion and the corresponding portion of the original digital pattern; and using the degree of dissimilarity to determine at said authenticator whether the recording was made from the at least one original analog form or from the other analog form. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
-
-
17. A method for use with an authenticator, the method comprising:
-
creating an original digital pattern including an original digital authentication pattern; making an original analog form thereof including an original analog authentication pattern causing a first loss; recording the original analog form to obtain a recorded original analog authentication pattern causing a second loss; comparing using a computer the recorded authentication pattern and the original digital authentication pattern of the original digital pattern using the sum of the first and second loss to determine a dissimilarity between the original digital authentication pattern and the recorded authentication pattern; and using the result of the comparison to perform the authenticity check at said authenticator, wherein the dissimilarity comprises an indication that the recorded authentication pattern was made from the original analog form. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24)
-
-
25. A method to determine whether an analog form is original, the method comprising:
-
creating an original digital representation of a document containing an original authentication pattern; printing the document to produce an original analog form causing a first loss of information; making a digital recording from at least a portion of an analog form, the analog form being the original analog form or a non-original analog form derived from the original analog form causing a second loss of information; comparing using a computer the digital recording with the original digital authentication pattern using the sum of the first and second loss of information to determine a degree of dissimilarity between the digital recording and the original authentication pattern; and using the degree of dissimilarity to determine whether the analog form is original or non-original.
-
-
26. A method for authenticating an object, the method comprising:
-
creating an original digital image; printing at least one original analog image from the original digital image on an object causing a first loss of information; making a digital recording from at least a portion of the at least one original analog image or from at least a portion of a non-original analog image derived from the at least one original analog image causing a second loss of information; comparing using a computer the digital recording with a corresponding portion of the original digital image using the sum of the first and second loss of information to determine a degree of dissimilarity between the digital recording made from the portion and the corresponding portion of the original digital image; and using the degree of dissimilarity to determine whether the recording was made from the at least one original analog image or from the non-original analog image.
-
-
27. A method for use with an authenticator, the method comprising:
-
creating an original digital pattern containing an authentication pattern; producing at least one original analog form from the original digital pattern causing a first loss of information; making a digital recording from at least a portion of the at least one original analog form or from at least a portion of another analog form derived from the at least one original analog form causing a second loss of information; comparing using a computer the digital recording with a corresponding portion of the original digital pattern using the sum of the first and second loss of information to determine a degree of dissimilarity between the digital recording made from the portion and the corresponding portion of the original digital pattern; and using the degree of dissimilarity to determine at said authenticator whether the recording was made from the at least one original analog form or from the other analog form; wherein comparing the digital recording with a corresponding portion of the original digital pattern comprises synchronizing the digital recording with the corresponding portion of the original digital pattern using synchronization points in the digital recording.
-
Specification