Methods and systems for automated fingerprint recognition

• US 7,474,773 B2
• Filed: 11/16/2007
• Issued: 01/06/2009
• Est. Priority Date: 02/14/2007
• Status: Expired due to Fees

• Current Assignee: Lam K.O. Chau
• Original Assignee: Lam K.O. Chau
• Inventors: Chau, Lam Ko
• Primary Examiner(s): Mariam; Daniel G
• Application Number:
  US11/985,761
• Publication Number:
  US 20080192994A1
• Time in Patent Office: 417 Days
• Field of Search: 382124-126, 382/116, 382/284, 283 68- 70
• US Class Current: 382/124
• CPC Class Codes: G06V 40/1324 by using geometrical optics, e.g. using prisms G06V40/1312 takes precedence
• CPC Class Codes: G06V 40/1371 Matching features related to minutiae or pores

Abstract

A method of identifying a donor of a fingerprint image exhibiting a pattern of minutiae. The method comprises deriving a donor index code and a donor match code associated with the donor fingerprint image. A database of records is accessed—each record being associated with an identity and indicative of a respective index code and a respective match code—in an attempt to identify at least one record for which the respective index code corresponds to the donor index code. Responsive to the attempt being successful, it is determined whether any of these “candidate” records includes a particular record for which the respective match code corresponds to the donor match code. Upon indeed determining that this is so for a particular record, an output is generated, such output being indicative of a conclusion that the donor of the fingerprint image has the identity associated with the particular record.

Claims

1. An image acquisition system, comprising:

a dark field image acquisition device for producing a first output representative of a fingerprint derived from a finger;

a bright field image acquisition device, different from the dark field image acquisition device, the bright field image acquisition device for producing a second output representative of a contour of the finger;

a processing entity configured to combine the first and second outputs to create a composite image of the finger.

2. The image acquisition system defined in claim 1, further comprising a transparent surface on which the finger is placed.

3. The image acquisition system defined in claim 2, further comprising a light source for shining light from underneath the surface at an angle to the surface.

4. The image acquisition system defined in claim 3, wherein the dark field image acquisition device is positioned so as to capture light reflected by valleys of the finger and refracted by the surface.

5. The image acquisition system defined in claim 4, wherein the dark field image acquisition device is located underneath the surface.

6. The image acquisition system defined in claim 5, wherein the first output is representative of a ridge/valley pattern of cart of the finger.

7. The image acquisition system defined in claim 6, wherein the composite image comprises the contour and the ridge/valley pattern.

8. The image acquisition system defined in claim 7, wherein the bright field image acquisition device comprises a camera.

9. The image acquisition system defined in claim 7, wherein the bright field image acquisition device comprises a 3-D profiler.