Image analysis – Applications – Personnel identification
Patent
1996-10-11
1999-12-14
Johns, Andrew W.
Image analysis
Applications
Personnel identification
G06K 900
Patent
active
060027843
ABSTRACT:
Detection of a fingerprint feature is performed on the basis of a directional distribution of a fingerprint obtained by setting a plurality of points on a circle having a center corresponding to a mark point on a directional pattern of ridges, obtaining inner products of vectors indicating tangent lines and vectors indicating ridges at the respective points and providing a distribution of the inner products as a directional distribution of ridges. As a first method, a Fourier expansion unit Fourier-expands the directional distribution of ridges and outputs Fourier coefficients for every frequency component, a power calculation unit calculates power of every frequency component on the basis of the Fourier coefficients, and a power determination unit detects the fingerprint feature on the basis of the power of every frequency component. As a second method, a smoothing unit divides the directional distribution of ridges into a plurality of parallel distributions and smoothes the respective partial distributions, and a zero cross detection unit detects the number of changes of value of the plurality of the smoothed partial distributions from positive to negative or negative to positive as the number of zero crossings, and detects the fingerprint feature on the basis of the number of zero crossings.
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Johns Andrew W.
NEC Corporation
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