System And Method For Iris Identification Using Stereoscopic Face Recognition

• US 20090041309A1
• Filed: 10/17/2008
• Published: 02/12/2009
• Est. Priority Date: 01/16/2002
• Status: Active Grant

• Current Assignee: Iritech Incorporated
• Original Assignee: Iritech Incorporated
• Inventors: Kim, Dae-Hoon, Choi, Byung-Ho, Paik, Seung-Min
• Granted Patent: US 7,715,595 B2
• Time in Patent Office: Days
• US Class Current: 382/117
• CPC Class Codes: A61B 5/1176 Recognition of faces
• CPC Class Codes: G06V 40/19 Sensors therefor

Abstract

Disclosed herein is a system and method for iris recognition including stereoscopic face recognition, which can recognize irises using a stereoscopic face recognition system in order to recognize an authenticatee. The system includes two or more face recognition cameras for photographing two or more face images of an authenticatee; a recognition system for receiving the face images photographed by the face recognition cameras from the face recognition cameras and creating stereoscopic face information on the basis of the face images; and one or more iris recognition cameras controlled by the recognition system to photograph focused irises of the authenticatee using the created stereoscopic face information.

Claims

1. A system for iris recognition using stereoscopic face recognition, comprising:

two or more face recognition cameras for photographing two or more face images of an authenticatee;

a recognition system for receiving the face images photographed by the face recognition cameras from the face recognition cameras and creating stereoscopic face information on the basis of the face images, the information including detected location information of pupils of the authenticatee by extracting parts of the face from the face images, and a detected distance information between the pupils and the face recognition cameras calculated by

(i) obtaining a distance (dθ

) between the two images on an image plane formed by the two face recognition cameras in a point (B) of an objective plane;

(ii) obtaining a distance (l) between the objective plane and the face recognition cameras by dividing, a value obtained by multiplying a distance (b) between the two face recognition cameras by a focal distance of the stereo cameras, by the distance (dθ

) between the two images on the image plane formed by the two face recognition cameras in the point (B) of the objective plane; and

(iii) moving the face recognition cameras by a distance obtained by subtracting the focal distance (f) of the two face recognition cameras from the distance (l) between the objective plane and the face recognition cameras in order to obtain a clear image; and

two or more iris recognition cameras controlled by the recognition system to photograph irises of the authenticatee using the created stereoscopic face information after adjusting a focal distance of the two or more iris recognition cameras based on the detected location and distance information.

2. The system for iris recognition using stereoscopic face recognition according to claim 1, further comprising an iris recognition camera driving system for moving the iris recognition cameras on the basis of the distance information to automatically focus the iris recognition cameras on the irises of the authenticatee, the iris recognition cameras being mounted on the driving system.

3. The system for iris recognition using stereoscopic face recognition according to claim 1, wherein the iris recognition cameras have lenses with 5 cm or more focal depth.

4. The system for iris recognition using stereoscopic face recognition according to claim 1, further comprising:

a body provided with a protective glass which is opaque for visible light and transparent to infrared light in a front thereof, and the iris recognition cameras therein, a region with which the irises of the authenticatee are aligned being represented on the protective glass; and

an infrared illumination device disposed around the iris recognition cameras and installed in the body together with the iris recognition cameras.

5. A method for iris recognition using stereoscopic face recognition, comprising the steps of:

photographing two or more face images of an authenticatee using two or more face recognition cameras to stereoscopically photograph a face of an authenticatee;

creating stereoscopic face information on the basis of the face images and detecting location information of pupils of the authenticatee by extracting parts of the face from the face images;

calculating a distance between the stereoscopic face recognition cameras to pupils by

(i) obtaining a distance (dθ

) between the two images on an image plane formed by the two face recognition cameras in a point (B) of an objective plane;

(ii) obtaining a distance (l) between the objective plane and the face recognition cameras; and

(iii) moving the face recognition cameras by a distance obtained by subtracting the focal distance (f) of the two face recognition cameras from the distance (l) between the objective plane and the face recognition camera in order to obtain a clear image;

adjusting two or more stereoscopic iris recognition cameras based on the calculated distance to pupils to adjust a focal distance of the iris recognition cameras; and

photographing irises of the authenticatee with the two or more iris recognition cameras using the calculated location of the face and the distance to the pupils.

6. The method according to claim 5, wherein the distance (l) is obtained by dividing a value obtained by multiplying a distance (b) between the two face recognition cameras by a focal distance of the stereo cameras, by the distance (dθ

) between the two images on the image plane formed by the two face recognition cameras in the point (B) of the objective plane.

7. The method according to claim 5, wherein the step of photographing irises comprises the steps of:

transmitting a message to the authenticatee so that the authenticatee can move to a certain location on a basis of the calculated distance to the pupils, and position of the face; and

photographing irises if it is determined that the authenticatee has moved to the predetermined location.

8. The method according to claim 5, further comprising the steps of:

extracting boundaries of the irises and the pupils from the photographed irises of the authenticatee; and

determining whether the authenticatee has taken a narcotic drug through a parameter analysis process for narcotic detection.

9. The method accordingly to claim 5, wherein the iris recognition cameras have lenses with 5 cm or more focal depth.

10. A system for iris recognition using stereoscopic face recognition, comprising:

a camera system comprising;

two or more face recognition cameras for photographing two or more face images of an authenticatee;

two or more iris recognition cameras for photographing a left iris and a right iris of an authenticatee;

a face illumination light source that illuminates a face of an authenticatee;

an iris illumination light source that illuminates a left iris and a right iris of an authenticatee;

a stepping motor for adjusting the iris recognition cameras; and

a control board electrically connected to the face recognition cameras, the iris recognition cameras, the face illuminating light source, the iris illuminating light source and the stepping motor; and

a recognition application system having recognition software configured for operation with the camera system through a transmission line;

one or more video signal cables for transmitting iris and face image information obtained by the cameras to the recognition application system;

wherein the recognition application system receives the face images photographed by the face recognition cameras from the face recognition cameras and creates stereoscopic face information on the basis of the face images, the information including detected location information of pupils of the authenticatee by extracting parts of the face from the face images, and a detected distance information between the pupils and the face recognition cameras calculated by

(i) obtaining a distance (dθ

) between the two images on an image plane formed by the two face recognition cameras in a point (B) of an objective plane;

(ii) obtaining a distance (l) between the objective plane and the face recognition cameras by dividing a value obtained by multiplying a distance (b) between the two face recognition cameras by a focal distance of the stereo cameras, by the distance (dθ

) between the two images on the image plane formed by the two face recognition cameras in the point (B) of the objective plane; and

(iii) moving the face recognition cameras by a distance obtained by subtracting the focal distance (f) of the two face recognition cameras from the distance (l) between the objective plane and the face recognition camera in order to obtain a clear image; and

wherein the stepping motor moves the iris recognition cameras on the basis of the calculated result, to focus the iris recognition cameras on the irises and photograph the irises of the authenticatee.

11. The system for iris recognition using stereoscopic face recognition according to claim 10, wherein the face illumination light source is a halogen lamp.

12. The system for iris recognition using stereoscopic face recognition according to claim 10, wherein the face illumination light source is an infrared light emitting-diodes.

13. The system for iris recognition using stereoscopic face recognition according to claim 10, wherein face recognition cameras for photographing a left side and a right side of a face are disposed at lower left and right side portions of a body of the camera system.

14. The system for iris recognition using stereoscopic face recognition according to claim 10, wherein the iris recognition cameras are disposed so that a distance between them corresponds to a distance between a left iris and a right iris of a person.

15. The system for iris recognition using stereoscopic face recognition according to claim 10, wherein the iris recognition cameras have lenses with 5 cm or more focal depth.

16. The system for iris recognition using stereoscopic face recognition according to claim 10, further comprising:

a body provided with a protective glass which is opaque for visible light and transparent to infrared light in a front thereof, and the iris recognition cameras therein, a region with which the irises of the authenticatee are aligned being represented on the protective glass; and

an infrared illumination device disposed around the iris recognition cameras and installed in the body together with the iris recognition cameras.