Systems And Methods For Detecting A Specular Reflection Pattern For Biometric Analysis

• US 20150042776A1
• Filed: 06/18/2012
• Published: 02/12/2015
• Est. Priority Date: 06/18/2011
• Status: Abandoned Application

• Current Assignee: MorphoTrust USA LLC (Advent International Corporation)
• Original Assignee: Morphotrust USA Incorporated (Advent International Corporation)
• Inventors: Davis, Matthew
• Application Number:
  US14/127,242
• Publication Number:
  US 20150042776A1
• Time in Patent Office: Days
• US Class Current: 348/78
• CPC Class Codes: G06V 10/993 Evaluation of the quality of the acquired pattern
• CPC Class Codes: G06V 40/19 Sensors therefor
• CPC Class Codes: H04N 23/611 where the recognised objects include parts of the human body

Abstract

Embodiments provide rapid detection of specular reflection patterns in eye images, which can then be analyzed to determine the quality of the image for biometric analysis. For example, systems and methods receive at least one image of an eye from an image capture system. The image capture system includes a camera and one or more illuminators that direct light at the eye while the camera captures the at least one image. The eye reflects the light from the illuminators to create a specular reflection pattern in the at least one image. The specular reflection pattern is located/identified and a quality of the at least one image of the eye, e.g., a focus measure, is determined based on the specular reflection pattern. A location of iris texture in the at least one image may be identified according to a location of the specular reflection pattern and analyzed for a focus measure.

Claims

1. A method for biometric analysis, comprising:

receiving at least one image of an eye from an image capture system, the image capture system including a camera and one or more illuminators that direct light at the eye while the camera captures the at least one image of the eye, the eye reflecting the light from the one or more illuminators to create a pattern of one or more specular reflections in the at least one image;

identifying, with a controller, the specular reflection pattern in the at least one image of the eye; and

determining, with the controller, a quality of the at least one image of the eye based on the specular reflection pattern.

2. The method according to claim 1, further comprising determining a location of the specular reflection pattern in the at least one image.

3. The method according to claim 2, further comprising determining a location of iris texture in the at least one image according to the location of the specular reflection pattern.

4. The method according to claim 3, wherein determining the quality of the at least one image includes determining a focus measure based on the located iris texture.

5. The method according to claim 1, wherein determining the quality of the at least one image includes determining a focus measure for the at least one image.

6. The method according to claim 5, wherein determining the focus measure for the at least one image includes determining a sharpness of one or more of the specular reflections by measuring a size of the one or more specular reflections.

7. The method according to claim 1, wherein determining the quality of the at least one image includes determining an intensity of areas surrounding the one or more specular reflections in the at least one image to determine a location of the one or more specular reflections relative to features of the eye.

8. The method according to claim 1, wherein determining the quality of the at least one image includes determining an occlusion of the one or more specular reflections in the at least one image.

9. The method according to claim 1, further comprising determining a type of image capture system according to the specular reflection pattern and analyzing the at least one image according to the type of image capture system.

10. The method according to claim 1, further comprising sending, to the image capture system, information relating to the quality of the at least one image, the image capture system being adjusted according to the quality information.

11. A system for biometric analysis, comprising:

an image capture system that captures at least one image of an eye, the image capture system including a camera and one or more illuminators that direct light at the eye while the camera captures the at least one image of the eye, the eye reflecting the light from the one or more illuminators to create a pattern of one or more specular reflections in the at least one image; and

a controller that identifies the specular reflection pattern in the at least one image of the eye and determines a quality of the at least one image of the eye based on the specular reflection pattern.

12. The system according to claim 11, wherein the controller further determines a location of the specular reflection pattern in the at least one image.

13. The system according to claim 12, wherein the controller further determines a location of iris texture in the at least one image according to the location of the specular reflection pattern.

14. The system according to claim 13, wherein the controller determines the quality of the at least one image by determining a focus measure based on the located iris texture.

15. The system according to claim 11, wherein the controller determines the quality of the at least one image by determining a focus measure for the at least one image.

16. The system according to claim 15, wherein the controller determines the focus measure for the at least one image by determining a sharpness of one or more of the specular reflections by measuring a size of the one or more specular reflections.

17. The system according to claim 11, wherein the controller determines the quality of the at least one image by determining an intensity of areas surrounding the one or more specular reflections in the at least one image to determine a location of the one or more specular reflections relative to features of the eye.

18. The system according to claim 11, wherein the controller determines the quality of the at least one image by determining an occlusion of the one or more specular reflections in the at least one image.

19. The system according to claim 11, wherein the controller determines a type of image capture system according to the specular reflection pattern and analyzes the at least one image according to the type of image capture system.

20. The system according to claim 11, wherein the controller sends, to the image capture system, information relating to the quality of the at least one image, the image capture system being adjusted according to the quality information.