Multispectral imaging biometrics

• US 7,831,072 B2
• Filed: 10/03/2008
• Issued: 11/09/2010
• Est. Priority Date: 06/01/2004
• Status: Active Grant

• Current Assignee: HID Global Corporation (Assa Abloy AB)
• Original Assignee: Lumidigm Incorporated (Assa Abloy AB)
• Inventors: Rowe, Robert K.
• Primary Examiner(s): Strege; John B
• Application Number:
  US12/245,012
• Publication Number:
  US 20090092290A1
• Time in Patent Office: 767 Days
• Field of Search: 382/124, 340/5.53, 340/5.83
• US Class Current: 382/124
• CPC Class Codes: G06V 10/143 Sensing or illuminating at different wavelengths
• CPC Class Codes: G06V 40/1324 by using geometrical optics, e.g. using prisms G06V40/1312 takes precedence
• CPC Class Codes: G06V 40/1394 using acquisition arrangements

Abstract

Methods and systems are provided for performing a biometric measurement on an individual. A purported skin site of the individual is illuminated under a plurality of distinct optical conditions during a single illumination session. Light scattered beneath a surface of the purported skin site is received separately for each of the plurality of distinct optical conditions. A multispectral image of the purported skin site is derived from the received light. A biometric function is performed with the derived multispectral image.

Claims

1. A method for performing a biometric measurement on an individual using a biometric measurement device, the method comprising:

illuminating a purported skin site of the individual under a plurality of distinct optical conditions during a single illumination session when the entire purported skin site is not in contact with the biometric measurement device;

receiving light scattered from the purported skin site separately for each of the plurality of distinct optical conditions when the entire purported skin site is not in contact with the biometric measurement device;

deriving a multispectral image of the purported skin site from the received light; and

performing a biometric function with the derived multispectral image.

2. The method according to claim 1, wherein the purported skin site is near a platen of the biometric measurement device when not in contact with the biometric measurement device.

3. The method according to claim 1, wherein the purported skins site is located a remote distance relative to the biometric measurement device when not in contact with portions of the biometric measurement device.

4. The method according to claim 1, wherein the receiving light scattered from the purported skin site includes receiving light scattered from beneath a surface of the purported skin site separately for each of the plurality of distinct optical conditions.

5. A biometric measurement device comprising:

at least one green illumination source configured to illuminate the purported skin site of the individual, the green illumination source being located at a first location within the biometric device;

at least one blue illumination source configured to illuminate the purported skin site of the individual, the blue illumination source being located at a second location within the biometric measurement device;

at least one imager configured to receive light scattered from the purported skin site of the individual from the green illumination source, and the blue illumination source; and

a controller interfaced with the green illumination source, the blue illumination source, and the imager, the controller including;

instructions to substantially simultaneously illuminate the purported skin site with the green illumination source, and the blue illumination source during a single illumination session;

instructions to derive a multispectral image of the purported skin site from light received by the imager; and

instructions to perform a biometric function with the derived multispectral image.

6. The biometric measurement device according to claim 5, wherein the illumination source includes a plurality of LEDs.

7. The biometric measurement device according to claim 5, wherein the imager comprises a color imager.

8. The biometric measurement device according to claim 5, wherein the imager comprises a color filter array.

9. The biometric measurement device according to claim 5, where the imager is further configured to separately receive green light, and blue light scattered from beneath a surface of the purported skin site.

10. The biometric measurement device according to claim 5 further comprising at least one red illumination source configured to illuminate a purported skin site of an individual, the red illumination source being located at a third location within the biometric measurement device.

11. A biometric measurement device comprising:

illuminating means for substantially simultaneously directing at least two distinct wavelength bands of light toward a purported skin site of an individual, each distinct wavelength band of light being directed from a distinct position within the biometric measurement device;

imaging means for collecting light scattered from the purported skin site of the individual wherein the imaging means comprises a color filter array; and

a controller interfaced with at least the imaging means, the controller including;

instructions to derive a multispectral image of the purported skin site from light received by the imaging means; and

instructions to perform a biometric function with the derived multispectral image.

12. The biometric measurement device according to claim 11, wherein the imaging means comprises a color imager.

13. The biometric measurement device according to claim 11, wherein the illuminating means includes a plurality of substantially monochromatic LEDs.

14. The biometric measurement device according to claim 11, wherein the illuminating means includes one or more LED selected from the group consisting of a red LED, a green LED and a blue LED.

15. A biometric measurement device comprising

an illumination system comprising a plurality of illumination sources, each illumination source providing light within a distinct wavelength band, and each illumination source being configured to illuminate a purported skin site of an individual at a distinct illumination angle;

an imager configured to receive light scattered from beneath the surface of the purported skin site for each of the distinct wavelength bands; and

a filter positioned between the imager and the purported skin site being configured to separate the plurality of distinct wavelengths wherein the filter comprises a color filter array; and

a controller coupled with the illumination system and the imager, the controller including instructions to derive a multispectral image of the purported skin site from light received by the imager.

16. The biometric measurement device according to claim 15, further comprising a controller coupled with the illumination system and the imager, the controller including instructions to substantially simultaneously illuminate the purported skin site with the plurality of illumination sources.

17. A method for performing a biometric measurement on an individual using a biometric measurement device, the method comprising:

illuminating a purported skin site of the individual with a plurality of broadband light sources located in a plurality of distinct locations;

receiving light scattered from the purported skin site;

filtering the light scattered from the purported skin site into at least two distinct wavelength bands wherein the filter comprises a color filter array that filters light into red light, green light and blue light;

deriving a multispectral image of the purported skin site from the received light; and

performing a biometric function with the derived multispectral image.

18. A biometric measurement device comprising:

a plurality of broadband illumination sources configured to illuminate the purported skin site from distinct locations;

an imager configured to capture light scattered from a purported skin site of an individual;

a filter placed between the imager and the purported skin site, the filter being configured to filter the received light into at least three distinct wavelength bands wherein the filter comprises a color filter array that filters light into red light, green light and blue light; and

a controller interfaced with at least the imaging means, the controller including;

instructions to illuminate the purported skins site with the plurality of broadband illumination sources substantially simultaneously;

instructions to derive a multispectral image of the purported skin site from light received by the imager; and

instructions to perform a biometric function with the derived multispectral image.

19. The biometric measurement device according to claim 18, wherein the imager comprises a color imager.