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Minutia Cylinder-Code: A new representation and matching technique for
fingerprint recognition
Families of local structures
4
Jiang (2000)
Ratha (2000)
Nearest neighbour-based structures: Fixed radius-based structures:
the neighbors are defined as all the minutiae
that are closer than a given radius R from the
central minutia. The descriptor length is
variable and depends on the local minutiae
density; this can lead to a more complex
local matching; however, in principle, missing
and spurious minutiae can be better
tolerated.
the neighbors of the central minutia
are formed by its K spatially closest
minutiae. This leads to fixed-length
descriptors that can be usually
matched very efficiently.
Matching fixed radius-based structures can lead to border
errors: in particular, minutiae which are close to the local region
border in one of the two fingerprints can be mismatched
because of different local distortion or location inaccuracy that
cause the same minutiae to move out of the local region in the
second fingerprint.
A critical point of these type of algorithms is the possibility of
exchanging nearest neighbour minutiae due to missing or
spurious ones.