Patents by Inventor Lam Ko Chau

Lam Ko Chau has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 9690972
    Abstract: Computer-readable media tangibly embodying computer-readable instructions stored in a memory and executable by a processor of a computer, wherein execution of the computer-readable instructions cause the computer processor to implement a method of encoding a fingerprint. The method comprises acquiring an image of a finger of a user; identifying a set of minutia points in the image; generating a code by a transformation of the minutia points, the transformation including: (i) creating a matrix from features of the minutia points; (ii) obtaining characteristic invariants of the matrix; and (iii) the code being formed based on the characteristic invariants of the matrix; and outputting the code in association with the user or the finger. The characteristic invariants may be the eigenvalues of the matrix.
    Type: Grant
    Filed: December 21, 2015
    Date of Patent: June 27, 2017
    Inventors: Lam Ko Chau, Aliaksandr Bialiayeu
  • Patent number: 7474773
    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.
    Type: Grant
    Filed: November 16, 2007
    Date of Patent: January 6, 2009
    Inventor: Lam Ko Chau
  • Publication number: 20080192994
    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.
    Type: Application
    Filed: November 16, 2007
    Publication date: August 14, 2008
    Inventor: Lam Ko Chau
  • Patent number: 7327859
    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.
    Type: Grant
    Filed: February 14, 2007
    Date of Patent: February 5, 2008
    Inventor: Lam Ko Chau
  • Patent number: 6757411
    Abstract: A method, system and computer readable-storage medium for generating an identification code from a fingerprint image exhibiting a plurality of features. The method includes establishing a reference point from the plurality of features, generating at least one metric from the reference point and at least one of the plurality of features and forming the identification code from the at least one metric. Changes in the temperature and humidity of a finger when the image is taken at different times will result in minor variations of the measured features which, upon quantization, result a metric that is invariant from one fingerprint image to the next, for the same finger. This lowers the false rejection rate to an acceptable level. Meanwhile, the metric is sufficiently unique for a given set of features such that the probability of assigning the same metric to two different fingers is lowered to an acceptable level.
    Type: Grant
    Filed: October 1, 2001
    Date of Patent: June 29, 2004
    Assignee: Liska Biometry Inc.
    Inventor: Lam Ko Chau
  • Publication number: 20030035569
    Abstract: A method, system and computer readable-storage medium for generating an identification code from a fingerprint image exhibiting a plurality of features. The method includes establishing a reference point from the plurality of features, generating at least one metric from the reference point and at least one of the plurality of features and forming the identification code from the at least one metric. Changes in the temperature and humidity of a finger when the image is taken at different times will result in minor variations of the measured features which, upon quantization, result a metric that is invariant from one fingerprint image to the next, for the same finger. This lowers the false rejection rate to an acceptable level. Meanwhile, the metric is sufficiently unique for a given set of features such that the probability of assigning the same metric to two different fingers is lowered to an acceptable level.
    Type: Application
    Filed: October 1, 2001
    Publication date: February 20, 2003
    Inventor: Lam Ko Chau