Anti-counterfeiting feature generation method for valuable document and authentication method and device therefor

Patent metadata

Field	Value
Publication number	US-9499006-B2
Application number	US-201314426949-A
Country	US
Kind code	B2
Filing date	Mar 19, 2013
Priority date	Sep 29, 2012
Publication date	Nov 22, 2016
Grant date	Nov 22, 2016

Abstract

An anti-counterfeiting feature generation method for a valuable document and an authentication method and device therefor. The anti-counterfeiting feature generation method for a valuable document uses the anti-counterfeiting feature information redundancy to hide accurate information about an anti-counterfeiting feature. In the generation method, the anti-counterfeiting feature of a valuable document has little change on the human perception, but a valuable document authentication device in a financial self-service equipment can effectively extract the hidden accurate information about an anti-counterfeiting feature from signals obtained by a sensor and conduct quantitative detection and authentication, thereby effectively authenticating whether the valuable document is counterfeit or not. A new anti-counterfeiting feature which facilitates machine recognition is loaded to the valuable document, and a corresponding valuable document authentication device is configured to a financial self-service equipment, so that the financial self-service equipment can read the anti-counterfeiting feature of the valuable document by facilitating machine recognition, thereby improving the authentication accuracy of the financial self-service equipment to the valuable document.

First claim

The invention claimed is:

1. A method for generating an anti-counterfeiting feature for a valuable document, comprising:
step one, scanning an original anti-counterfeiting feature M on the valuable document by a sensor, to obtain M 1 composed of partial information M 10 sensitive for human perception and partial information M 11 insensitive for human perception, and setting M 2 to denote accurate anti-counterfeiting characteristic information of the original anti-counterfeiting feature M that is not obtainable by the sensor, M 2 being composed of partial information M 20 sensitive for human perception and partial information M 21 insensitive for human perception, wherein M is an image of a number in optically variable ink showing a denomination, M 1 is a pixel matrix f 1 (x, y) in the spatial domain representing the image of the number in optically variable ink showing the denomination as perceived by a human eye when the valuable document is viewed at a right angle, and M 2 is a pixel matrix f 2 (x, y) in the spatial domain representing the image of the number in optically variable ink showing the denomination as perceived by the human eye when the valuable document is viewed at a non-right angle;
step two,
performing a wavelet transform W on the pixel matrixes for frequency-domain transform:
W[f 1 ]=R 1 ,
W[f 2 ]=R 2

where

R
1

=

[

H
1

⁢

H
1

H
1

⁢

L
1

H
1

⁢

L
1

L
1

⁢

L
1

]

⁢

⁢
and
⁢

⁢

R
2

=

[

H
2

⁢

H
2

H
2

⁢

L
2

H
2

⁢

L
2

L
2

⁢

L
2

]

,

R 1 and R 2 represent frequency-domain coefficient matrixes obtained from the wavelet transform on f 1 (x, y) and f 2 (x, y) respectively, H 1 H 1 in R 1 represents a highest-frequency coefficient and L 2 L 2 in R 2 represents a lowest-frequency coefficient;
step three, substituting L 2 L 2 in R 2 for H 1 H 1 in R 1 , and obtaining the following equation:

R
1
′

=

[

L
2

⁢

L
2

H
1

⁢

L
1

H
1

⁢

L
1

Assignees

• Grg Banking Equipment Co Ltd

Inventors

• Liang Tiancai
• Yu Yuanchao
• Wang Weifeng
• Wang Xiaoliang

Classifications

• B42D25/405

  Marking · CPC title

• G07D7/206

  Matching template patterns · CPC title

• G07D7/0034

  using watermarks · CPC title

• B42D25/30 Primary

  Identification or security features, e.g. for preventing forgery · CPC title

• G07D7/0053

  involving markings added to a pattern, e.g. interstitial points · CPC title