IMAGING APPARATUS

• US 20020164054A1
• Filed: 11/13/1998
• Published: 11/07/2002
• Est. Priority Date: 10/24/1997
• Status: Active Grant

• Current Assignee: British Telecommunications PLC (BT Group PLC)
• Original Assignee: British Telecommunications PLC (BT Group PLC)
• Inventors: SEAL, CHRISTOPHER HENRY, MCCARTNEY, DAVID JOHN
• Granted Patent: US 6,687,389 B2
• Time in Patent Office: Days
• US Class Current: 382/118
• CPC Class Codes: A61B 5/1176 Recognition of faces
• CPC Class Codes: G06V 40/16 Human faces, e.g. facial parts, sketches or expressions
• CPC Class Codes: G06V 40/19 Sensors therefor

Abstract

An imaging apparatus (34) suitable for capturing an image of one or more of a user'"'"'s facial features is disclosed. The apparatus includes a spherical cold mirror (45) which presents a concave surface to the user and is disposed between the user and the camera (47). The user is able to conclude that he is close enough to the camera (47) for successful image capture when the reflection he sees in the mirror (45) is the right way up. In a preferred embodiment, markings are provided on the front surface of the mirror to aid the user in placing his eye within a predetermined range of distances from the camera (47). The imaging apparatus 34 is suitable for use in iris recognition apparatuses and provides a relatively inexpensive alternative to known apparatuses. ?

Claims

1. A facial feature imaging apparatus comprising:

a camera apparatus operable to capture an image of one or more facial features of a user, light reflected from said facial features travelling along an optical path from said facial features to said camera apparatus;

a visible light reflector disposed, in use, across said optical path, and such that the user can see his reflection therein, which reflection gives a positive visual indication to the user that he is within a preferred range of distances from the camera.

2. An apparatus according to claim 1 wherein said reflector comprises one or more optical elements which, in combination, have an optical power greater than zero.

3. An apparatus according to claim 1 or 2 wherein said reflector has a reflecting surface shaped so as to present said positive visual indication.

4. An apparatus according to claim 3 wherein said visible light reflector comprises a curved reflector whose concave surface is viewed by the user.

5. An apparatus according to claim 3 wherein the positive optical indication is the uprightness of the reflection.

6. An apparatus according to any one of claims 2 to 5 wherein said reflector comprises a mirror.

7. An apparatus according to any one of claims 2 to 5 wherein said reflector comprises a lens having a reflective coating thereon.

8. An apparatus according to any preceding claim wherein said reflector is provided with markings to be aligned with one or more of the user'"'"'s facial features.

9. An apparatus according to any preceding claim wherein said camera is responsive to non-visible light and said reflector allows the passage of said non-visible light.

10. An apparatus according to any preceding claim wherein said apparatus is an iris imaging apparatus.

11. An identification apparatus comprising a facial feature imaging apparatus according to any preceding claim, a storage means storing one or more facial feature data sequences and a comparison means for comparing facial feature data sequences derived from one or more images obtained by the imaging apparatus with the one or more facial feature data sequences stored in the storage means.