Compact image steering and focusing device

• US 5,717,512 A
• Filed: 05/15/1996
• Issued: 02/10/1998
• Est. Priority Date: 05/15/1996
• Status: Expired due to Term

• Current Assignee: Sensar, Inc. (Advent International Corporation)
• Original Assignee: Sensar, Inc. (Advent International Corporation)
• Inventors: Chmielewski, Thomas A. Jr., Negin, Michael, Vonhof, George A.
• Primary Examiner(s): Phan, James
• Application Number:
  US08/648,324
• Time in Patent Office: 636 Days
• Field of Search: 359/196, 359/201, 359/202, 359/209, 359/210, 359/212, 359/215, 359/223, 359/225, 359/226, 359/871, 359/872, 359/876, 359/877, 348/169, 348/77, 382/115, 382/291
• US Class Current: 359/210.1
• CPC Class Codes: G02B 26/0816 by means of one or more reflecting elements
• CPC Class Codes: G06V 40/19 Sensors therefor
• CPC Class Codes: G07C 9/37 using biometric data, e.g. fingerprints, iris scans or voice recognition
• CPC Class Codes: G07F 19/20 Automatic teller machines [ATMs]
• CPC Class Codes: G07F 19/201 Accessories of ATMs
• CPC Class Codes: G07F 19/207 Surveillance aspects at ATMs
• CPC Class Codes: H04N 13/207 using a single 2D image sensor
• CPC Class Codes: H04N 13/239 using two 2D image sensors having a relative position equal to or related to the interocular distance H04N13/243 takes precedence
• CPC Class Codes: H04N 13/246 Calibration of cameras
• CPC Class Codes: H04N 13/254 in combination with electromagnetic radiation sources for illuminating objects
• CPC Class Codes: H04N 13/296 Synchronisation thereof; Control thereof
• CPC Class Codes: H04N 2013/0081 Depth or disparity estimation from stereoscopic image signals

Abstract

A compact image steering and focusing device has a generally rectangular frame containing a pan/tilt mirror and at least one lens. There is a tilt plane bisecting the frame. A mirror drive motor is attached to the frame on one side of the tilt plane and a lens motor is attached to the frame on the other side of the tilt plane. The frame is rotatably attached to a stand and connected to a frame drive motor mounted on the stand. The device can fit behind the cover plate of an automated teller machine. This system is preferably used with a narrow field of view camera and two wide field of view cameras. Images from the wide field of view cameras are used to focus the narrow field of view camera on one eye of the automated teller machine user to identify the user by iris analysis and comparison to an iris image on file.

Claims

1. A compact image steering and focusing device comprising:

a. a frame comprised of an end portion having a pair of substantially parallel, spaced apart arms extending from one face of the end portion, there being a tilt plane passing between and equidistant from the arms;

b. a primary mirror pivotably attached between the arms and able to be rotated around a pan axis which is normal to the tilt plane;

c. a mirror drive motor attached to the frame, connected to the primary mirror in a manner to be able to rotate the primary mirror about the pan axis, and positioned on one side of the tilt plane;

d. a primary lens positioned between the arms and aligned with the primary mirror;

e. a lens motor attached to the frame connected to the primary lens in a manner to be able to move the lens toward and away from the primary mirror and positioned on a side of the tilt plane opposite the side of the tilt plane on which the mirror drive motor is positioned;

f. a stand to which the frame is rotatably attached for rotation about a frame axis transverse to the pan axis; and

g. a frame drive motor mounted on the stand and connected to the frame in a manner to rotate the frame about the frame axis.

2. The device of claim 1 also comprising a second mirror attached to the frame and aligned with the primary lens.

3. The device of claim 1 wherein the mirror drive motor is a linear drive motor.

4. The drive of claim 1 also comprising a belt drive connected between the mirror drive motor and the mirror.

5. The device of claim 1 also comprising a belt drive connected between the frame drive motor and the frame.

6. The device of claim 1 also comprising a camera aligned with the primary lens in a manner so that light passing through the primary lens will go into the camera.

7. The device of claim 1 also comprising at least one secondary mirror positioned between the primary lens and a camera.

8. The device of claim 1 also comprising a second lens positioned between the mirror and the primary lens.

9. The device of claim 1 also comprising a light source positioned so that a light beam emitted from the light source will be reflected from the primary mirror.

10. The device of claim 9 wherein the light source is positioned so that the light beam will pass through the primary lens.

11. The device of claim 9 wherein the light source can emit at least one of infrared light, visible light, a select band of frequencies, and both infrared and visible light.

12. The device of claim 9 also comprising a variable aperture lens positioned between the light source and the primary mirror.

13. The device of claim 9 wherein the light source is a strobe light.

14. The device of claim 13 also comprising:

a. a camera positioned to receive a light beam emitted from the light source, reflected by the primary mirror and reflected back from a scene; and

b. a synchronizer connected to the camera and the light source for synchronizing the operation of the camera with the strobing of the light source.

15. The device of claim 9 also comprising a strobing device connected to the light source.

16. The device of claim 9 wherein the light source is a light emitting diode.

17. The device of claim 9 wherein the light source is positioned around a camera body to give nearly on-axis illumination.

18. The device of claim 1 also comprising at least one limit switch connected to one of the motors.

19. The device of claim 1 also comprising at least one position sensor mounted on one of the frame and the stand in a manner to determine positions of at least one of the primary mirror, the primary lens and the frame.

20. The device of claim 1 also comprising a second camera attached to the stand.

21. The device of claim 20 also comprising a third camera attached to the stand wherein the second camera and the third camera have overlapping fields of view.

22. The device of claim 21 also comprising an image processor which receives images of a subject in the overlapping fields of view from both the second camera and the third camera and processes those images to determine an x, y, z coordinate position relative to the second and third cameras for a point on the subject forward which point a first camera can be directed.

23. The device of claim 20 also comprising:

a. a first camera aligned with the primary lens in a manner so that light reflected from the primary mirror and passing through the primary lens will go to the first camera;

b. an image processor which receives images from the second camera and identifies at least one point in the images corresponding to a point on a subject being photographed by the second camera; and

c. a controller connected to the image processor and the mirror drive motor which activates the mirror drive motor to position the primary mirror so that light reflected from the point on the subject to the primary mirror will be reflected by the primary mirror to the first camera.

24. The device of claim 23 wherein the image processor is programmed to compare images from the second camera to determine if the subject is moving, calculate a motion path of a moving subject and direct the primary mirror motor to compensate for such motion.

25. The device of claim 1 also comprising:

a. a narrow field of view camera which receives light reflected from a subject to the primary mirror and is reflected from the primary mirror to the narrow field of view camera;

b. a wide field of view camera; and

c. an image processor which receives images from both cameras and identifies at least one point in images received from at least one camera which point corresponds to a point of interest on a subject being imaged.

26. The device of claim 25 wherein the image processor identifies the at least one point in images received from the one of the narrow field of view camera and the whole field of view camera.

27. The device of claim 1 wherein at least one of the mirror drive motor, the lens motor, and the frame drive motor is a stepper motor.

28. The device of claim 27 also comprising a controller connected to the stepper motor and a position sensor connected to the controller wherein the position sensor provides signals to the controller and the controller supplies the stepper motor with corresponding drive signals.

29. The device of claim 26 also comprising a controller connected to the DC motor and a position sensor connected to the controller wherein the position sensor provides signals to the controller and the controller supplies the DC motor with corresponding drive signals.

30. The device of claim 1 wherein at least one of the mirror drive motor, the lens motor, and the frame drive motor is a DC motor.