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Fingerprint imaging and quality characterization

  • US 9,111,125 B2
  • Filed: 02/08/2013
  • Issued: 08/18/2015
  • Est. Priority Date: 02/08/2013
  • Status: Active Grant
First Claim
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1. A fingerprint imaging system comprising:

  • a fingerprint sensor configured to generate a fingerprint image of a fingerprint; and

    a processor configured to process the fingerprint image, the processor operable to;

    generate a ridge flow map based on, at least in part, the fingerprint image, the ridge flow map comprising ridge flow vectors characterizing the fingerprint;

    generate a multi-layer decomposition of the ridge flow map based on, at least in part, the ridge flow vectors, the decomposition comprising;

    a first-order residual map comprising first-order residuals for the ridge flow vectors, based on, at least in part, a first-order set of adjacent ridge flow vector values; and

    a second-order residual map comprising second-order residuals for the ridge flow vectors, based on, at least in part, a second-order set of the adjacent first-order values;

    wherein;

    the processor is further operable to characterize a quality of the fingerprint image, based on, at least in part, the first and second order residuals;

    the first-order residuals comprise a difference between respective ridge flow vector values, and an average value of the first-order set of adjacent ridge flow vector values; and

    the second-order residuals comprise a difference between respective average values of the first-order set, and an average value of the second-order set of adjacent first-order values.

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