Polygonal ridge flow classification
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United States of America Patent
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N/A
Issued Date -
Feb 17, 2005
app pub date -
Jul 6, 2004
filing date -
Jul 3, 2003
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A process in which a ridge flow analysis of a fingerprint image can be used to determine a fingerprint classification. Areas of like valued ridge flow are collected as regions and said regions are then joined together when edges of the regions exist. These vertices are then reduced to form polygons. Polygons that have a predetermined number of vertices (i.e., 8) and contain values from across a range of the possible ridge flow values (i.e., one of each possible ridge flow value) from the ridge flow table are primary polygons associated with singularity points. These singularity points are further identified as cores or deltas allowing the print image to be globally classified as loop, arch or whorl. Further techniques including, but not limited to, ridge counting can be used to classify the fingerprint as a left or right loop, plain or tented arch, or whorl.
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