Method for verifying a security device comprising a signature

Patent metadata

Field	Value
Publication number	US-10445968-B2
Application number	US-201615566828-A
Country	US
Kind code	B2
Filing date	Apr 15, 2016
Priority date	Apr 17, 2015
Publication date	Oct 15, 2019
Grant date	Oct 15, 2019

Abstract

A method for verifying a security device including an image having a signature. The method may include operations for acquiring the image in order to obtain a first representation of the image, extracting the signature, and verifying the signature. Also included are implementations in the form of a verification apparatus, a computer program, and a computer data medium including such a computer program.

First claim

The invention claimed is:

1. A method for verifying a security device including an image having a signature, wherein the method comprises the following steps:
acquiring the image in a first optical spectrum in order to obtain a first representation;
extracting the signature; and
verifying the signature,

wherein:
the signature is colorimetric and comprises a particular orientation of a color plate, or
the signature is a frequency signature and the image includes at least one reference spatial period.

2. A method according to claim 1 , wherein when the signature is a frequency signature and the image includes at least one reference spatial period, the method further comprises the following steps:
applying a spectral transformation to the first representation in order to obtain a first transform including at least one first spatial period; and
verifying that the value of the at least one first spatial period corresponds to the value of the at least one reference spatial period.

3. A method according to claim 2 , further comprising the following steps:
applying the spectral transformation to the second representation in order to obtain a second transform that includes at least one second spatial period; and
verifying that the first transform is substantially equal to the second transform.

4. A method according to claim 3 , further comprising a step of:
verifying that the value of the at least one second spatial period of the second transform corresponds to the value of the at least one reference spatial period.

5. A method according to claim 3 , wherein the spectral transformation is applied to at least one portion of the first representation and/or to the same at least one portion of the second representation.

6. A method according to claim 5 , further comprising a step of:
verifying that the first representation and the second representation are colorimetrically different.

7. A method according to claim 3 , wherein the spectral transformation is applied to at least two portions of a representation to produce at least two transforms, and in which the method further comprises a step of:
verifying that the at least two transforms of the at least two portions are substantially equal.

8. A method according to claim 1 , wherein the image is visible in the first optical spectrum and in at least one second optical spectrum, and in which the method further comprises the following steps:
acquiring the image in the at least one second optical spectrum in order to obtain a second representation;
verifying that the first representation and the second representation are graphically substantially identical; and
verifying that a distance between the first representation and the second representation is below a threshold.

9. A method according to claim 8 , wherein the threshold is equal to one of: 10 μm or 5 μm.

10. A method according to claim 8 , wherein the distance between the first representation and the second representation is determined by means of a registration algorithm to identify a transformation for which one of the representations is the image of the other representation.

11. A method according to claim 8 , wherein the first optical spectrum is situated in the visible spectrum, and/or the at least one second optical spectrum is situated in the infrared spectrum.

12. A method according to claim 8 , wherein the image represents a portion of the body of a holder associated with the security device, and in which the method further comprises the steps of:
acquiring an image of the portion of the body from a bearer of the security device;
verifying that the acquired image corresponds biometrically with the first representation; and/or
verifying that the acquired image corresponds biometrically with the second representation.

13. A method according to claim 8 , wherein the security device is associated with digital storage means including a digital representation of the image, and in which the method further comprises the steps of:
reading the digital representation of the image;
verifying that the digital representation is substantially identical to the first representation; and/or
verifying that the digital representation is substantially identical to the second representation.

14. A method according to claim 13 , further comprising a step of:
verifying that the acquired image corresponds biometrically with the digital representation.

15. A verification apparatus for verifying a security device that includes an image that has a signature, the verification apparatus comprising:
a memory that includes instructions; and
a computer, operably connected to the memory, that execuctes the instructions to perform operations comprising:
acquiring the image in a first optical spectrum in order to obtain a first representation;
extracting the signature; and
verifying the signature,

wherein:
the signature is colorimetric and comprises a particular orientation of a color plate, or
the signature is a frequency signature and the image includes at least one reference spatial period.

16. A non-transitory computer data medium that includes a computer program that, when executed by a computer, implements a method for verifying a security device that includes an image that has a signature, the method comprising:
acquiring the image in a first optical spectrum in order to obtain a first representation;
extracting the signature; and
verifying the signature,
wherein:
the signature is colorimetric and comprises a particular orientation of a color plate, or
the signature is a frequency signature and the image includes at least one reference spatial period.

Assignees

• Idemia France

Inventors

• Berthe Benoît
• Vandroux Coralie
• Morel Yvonnic

Classifications

• G07D7/004

  using digital security elements, e.g. information coded on a magnetic thread or strip · CPC title

• G07D7/1205 Primary

  Testing spectral properties · CPC title

• G07D7/12 Primary

  Visible light, infrared or ultraviolet radiation · CPC title

• G07D7/003

  using security elements (using digital security elements G07D7/004) · CPC title

• G07D7/205 Primary

  Matching spectral properties · CPC title