Systems and methods with identity verification by comparison and

Details Systems and methods with identity verification by comparison and Systems and methods with identity verification by comparison and

1996-09-09

1999-06-01

Boudreau, Leo H.

Image analysis

Applications

Personnel identification

382209, G06K 900

Patent

active

059095016

ABSTRACT:
Preferably a sensor receives a print image from an authorized person to form a template, and from a candidate to form test data. Noise variance is estimated from the test data as a function of position in the image, and used to weight the importance of comparison with the template at each position. Test data are multilevel, and are bandpassed and normalized--and expressed as local sinusoids--for comparison. A ridge spacing and direction map of the template is stored as vector wavenumber fields, which are later used to refine comparison. Global dilation--and also differential distortions--of the test image are estimated, and taken into account in the comparison. Comparison yields a test statistic that is the ratio, or log of the ratio, of the likelihoods of obtaining the test image assuming that it respectively was, and was not, formed by an authorized user. The test statistic is compared with a threshold value, preselected for a desired level of certainty, to make the verification decision--which controls access to a utilization system such as facilities, equipment, a financial service, or a system for providing or receiving information. Certain forms of the invention also encompass the utilization system. Nonvolatile memory holds instructions for automatic operation as described above.

REFERENCES:
patent: 4641350 (1987-02-01), Bunn
patent: 4811414 (1989-03-01), Fishbine et al.
patent: 4956870 (1990-09-01), Hara
patent: 5040223 (1991-08-01), Kamiya et al.
patent: 5715325 (1998-02-01), Bang et al.

Affiliated with

Also associated with

Rating

Systems and methods with identity verification by comparison and does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Systems and methods with identity verification by comparison and, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Systems and methods with identity verification by comparison and will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-960443