Method of smoothing a ridge direction pattern and an equipment u

Details Method of smoothing a ridge direction pattern and an equipment u Method of smoothing a ridge direction pattern and an equipment u

1993-01-07

1997-03-04

Boudreau, Leo

Image analysis

Applications

Personnel identification

382254, G06K 900

Patent

active

056088116

ABSTRACT:
An energy function is defined as a linear sum of a discrepancy evaluation function and a dispersion evaluation function. Direction variables of all the subregions of a ridge direction pattern are variables of both evaluation functions. Direction variables are successively renovated along a line on which the energy function becomes minimum for a change of a concerned variable keeping all other variables unchanged. Reliabilities of initial directions in all the subregions are included as coefficients in the discrepancy evaluation function, and a higher reliability of an initial direction constrains the directional difference between the initial direction and the corresponding direction variable in a smaller amount. A set of variables which makes the energy function minimum is taken as a set of smoothed ridge direction pattern.

REFERENCES:
patent: 4817183 (1989-03-01), Sparrow
patent: 5140642 (1992-08-01), Hsu et al.

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