finger print classification. what is a fingerprint? finger skin is made of friction ridges, with...
TRANSCRIPT
![Page 1: Finger print classification. What is a fingerprint? Finger skin is made of friction ridges, with pores (sweat glands). Friction ridges are created during](https://reader035.vdocuments.net/reader035/viewer/2022062421/56649ce25503460f949ad190/html5/thumbnails/1.jpg)
Finger print classification
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What is a fingerprint?
• Finger skin is made of friction ridges, with pores (sweat glands). Friction ridges are created during fetal live and only the general shape is genetically defined
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Primates also have fingerprints
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So do koalas!
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General Characteristics – macro-singularities
• Loops
• Whorls
• Arches
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Arch
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Tented Arch
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Loops
Left loop Right loop
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Double loops
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Whorl
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Type lines
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Ridge lines often flow in parallel producing features called whorl , loop and delta
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The ridge-line flow can be described by a directional map
(or directional image) which is a discrete matrix whose elements denote the orientation of the tangent to the ridge
lines.
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Minutiae
• Minutiae play a primary role for fingerprint matching, since most of the algorithms rely on the coincidence of minutiae to state whether two impressions are of the same finger or not.
• Minutiae matching, which is essentially a point pattern matching problem, constitutes the basis of most of the automatic algorithms for fingerprint comparison.
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Types of minutiae
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Micro-singularities, called minutiae or Galton characteristics, are determined by termination or
bifurcation of the ridge lines.
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Fingerprint minutiae
Bifurcation, ridge ending, core, delta
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Deltas
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Fingerprint matching – finding points of correspondence
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Accidental – unusual combinations
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Scars produce unusual patterns
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Some skin conditions can produce altered fingerprints
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Twins have different fingerprints: overall pattern is similar, differ in fine details
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