Method and apparatus for capturing the image of a palm

• US 6,038,332 A
• Filed: 09/05/1997
• Issued: 03/14/2000
• Est. Priority Date: 09/05/1997
• Status: Expired due to Term

• Current Assignee: Digital Biometrics, Inc. (Advent International Corporation)
• Original Assignee: Digital Biometrics, Inc. (Advent International Corporation)
• Inventors: Fishbine, Glenn, Stoltzman, David E.
• Primary Examiner(s): Kelley, Christopher S.
• Application Number:
  US08/924,694
• Time in Patent Office: 921 Days
• Field of Search: 382/115, 382/118, 382/126, 382/127, 356/71
• US Class Current: 382/115
• CPC Class Codes: G06V 40/1335 Combining adjacent partial images (e.g. slices) to create a composite input or reference pattern; Tracking a sweeping finger movement

Abstract

The present invention provides a palm print scanner where a palm is placed on the exterior of a transplant cylinder. A light source rotatably positioned within the cylinder rotates about the circumference of the inner surface of the cylinder so that partial palm print images are propagated from the cylinder. The partial palm print images are captured by an imager and sent to an image memory where they are combined to form a composite palm print image.

Claims

1. A method of capturing an image of a palm, comprising:

providing a fixed cylindrical surface having a first end and a second end, the cylindrical surface including an interior concave surface and an exterior convex surface;

placing a palm on the exterior convex surface of the cylindrical surface;

rotating a light source to selectively illuminate the palm through the interior surface of the cylindrical surface such that palm print images are propagated; and

imaging the palm print images with an imaging element, where the imaging element creates arrays characteristic of partial palm print images.

2. A method as in claim 1 wherein the arrays characteristic of partial palm print images are combined in an image memory to form a composite palm print image.

3. A method as in claim 2 wherein the arrays characteristic of palm print images are combined in the image memory by placing them side by side.

4. A method as in claim 2 wherein the palm print images are combined in the image memory by storing a darkness function.

5. A method as in claim 1, further comprising:

at least partially obstructing light from the light source that is reflected from the interior surface of the cylindrical surface.

6. A method as in claim 1 further comprising:

providing an angled mirror which rotates with the light source to reflect the palm print images propagated from the cylinder onto the imaging element.

7. A palm scanner, comprising:

a cylinder surface including a first end and a second end and a side wall defining a concave interior surface and a convex exterior surface, wherein a palm is placed on the outer surface of the cylinder;

a light source operative to selectively illuminate the palm through the interior surface of the cylinder surface, such that discrete images of the palm are selectively propagated from the cylinder surface;

an imaging element positioned to selectively image the palm print images propagated from the cylindrical surface.

8. A palm scanner as in claim 7 wherein the imaging element is a linear CCD element.

9. A palm scanner as in claim 8 wherein the CCD element is remotely positioned from the first end of the cylindrical surface and a mirror is positioned underneath the cylindrical surface to reflect the palm print images propagated from the cylinder onto the CCD element.

10. A palm scanner as in claim 9 further comprising a lens to focus the propagated palm print image onto the CCD element.

11. A palm scanner as in claim 9 wherein the mirror is positioned at a 45 degree angle relative to the cylinder.

12. A palm scanner as in claim 8 wherein a mask is positioned to keep light reflected from the inner surface of the cylindrical surface from imaging the CCD element.

13. A palm scanner as in claim 8 wherein the cylindrical surface comprises a partial cylinder.

14. A palm scanner as in claim 8 wherein the cylindrical surface is a full hollow cylinder.

15. A palm scanner as in claim 13 wherein the light source includes a lamp focused on a collection of fiber optic strands where the fiber optic strands are configured to illuminate the inner surface and the cylindrical surface and the mask is positioned between the fiber optic strands and the inner surface and the cylindrical surface.

16. A palm scanner as in claim 14 wherein the light source includes a lamp focused on a quartz rod where the quartz rod is positioned within the lumen of the cylinder between the first and second ends of the cylinder and the mask is positioned between the quartz rod and the inner surface of the cylinder.

17. A palm scanner as in claim 8 wherein the cylindrical surface is constructed from quartz and its diameter is between 5 and 9 inches.

18. A palm scanner as in claim 8 wherein the cylinder is rigidly mounted to a frame, and an axle is positioned within the lumen of the cylinder between its first and second ends, a motor is connected to the axle to rotate the axle within the cylinder;

the light source is connected to the axle so that when the axle rotates the light source selectively illuminates portions of the cylinder.

19. A palm scanner as in claim 18 wherein the motor is a stepper motor.

20. A palm scanner as in claim 19 further comprising an angled mirror connected to the axle and position to reflect the images of the palm onto the CCD element.

21. A palm scanner as in claim 8 further comprising a processor which receives the images of the palm from the CCD element combines the discrete palm print images into an image memory.

22. A palm scanner operative in capturing an image of a palm print comprising:

a partial cylinder defined by a side wall having first and second ends, a concave interior surface, and a convex exterior surface, the exterior surface of the cylinder defining a palm placement surface;

an axle extending between the first and second ends of the cylinder proximate the interior surface;

a light source connected to the axle and positioned proximate to the interior surface of the cylinder, the light source operative to illuminate a portion of the cylinder so that partial palm print images are propagated;

an angled mirror connected to the axle and operative to reflect the partial palm print images;

a CCD element positioned to receive the partial palm print images reflected from the mirror;

a processor which receives the partial palm print images from the CCD element and combines them into a composite image.

23. A palm imaging device, comprising:

A cylindrical wall including an interior concave surface and an exterior convex surface, the exterior surface defining a palm-contacting surface;

a light source operative to selectively illuminate a palm through the interior surface of the cylindrical wall such that palm print images are propagated;

an imaging element operative to selectively image the palm print images propagated from the cylindrical surface; and

a mask positioned between the imaging element and the interior surface of the cylindrical wall, the mask operative to at least partially obstruct light from the light source that is reflected from the interior surface of the cylindrical surface.