×

Gray scale matcher

  • US 7,450,741 B2
  • Filed: 06/22/2004
  • Issued: 11/11/2008
  • Est. Priority Date: 06/23/2003
  • Status: Active Grant
First Claim
Patent Images

1. A method for comparing a first print image having a first set of minutiae to a second print image having a second set of minutiae, wherein at least a second subset of minutiae from the second set is mated to a first subset of minutiae from the first set, the method comprising the steps of:

  • selecting a first pair of minutiae from the first subset and a second pair of corresponding mated minutiae from the second subset;

    generating a first segment by connecting the first pair of minutiae, wherein the first pair of minutiae are endpoints to the first segment and a second segment by connecting the second pair of minutiae, wherein the second pair of minutiae are endpoints to the second segment;

    extending the first segment or the second segment so that one segment is longer than the other segment;

    generating a first cross-section waveform profile based on the first segment and a second cross-section waveform profile based on the second segment, wherein the extended segment is used to generate a corresponding extended cross-section waveform profile that is longer that the other cross-section waveform profile by a predetermined number of samples;

    computing at least one similarity measure that is indicative of the similarity between the first cross-section waveform profile and the second cross-section waveform profile by correlating the shorter cross-section waveform profile against the extended cross-section waveform profile; and

    calculating a metric based on the at least one computed similarity measure which indicates similarity between the first print image and the second print image.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×