Systematic Methods for the Computation of the Directional Fields and Singular Points of Fingerprints
IEEE Transactions on Pattern Analysis and Machine Intelligence
Handbook of Fingerprint Recognition
Handbook of Fingerprint Recognition
A chaincode based scheme for fingerprint feature extraction
Pattern Recognition Letters
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One of the challenges to be overcome in automated fingerprint matching is the construction of a ridge pattern representation that encodes all the relevant information while discarding unwanted detail. Research published recently has shown how this might be achieved by representing the ridges and valleys as a periodic wave. However, deriving such a representation requires assigning a consistent unambiguous direction field to the ridge flow, a task complicated by the presence of singular points in the flow pattern. This disambiguation problem appears to have received very little attention. We discuss two approaches to this problem -- one involving construction of branch cuts, the other using a divide-and-conquer approach, and show how either of these techniques can be used to obtain a consistent flow direction map, which then enables the construction of a phase based representation of the ridge pattern.