Fingerprint Patterns
• Arch
– In an arch pattern the
ridges enter from one
side, make a rise in the
center and exit
generally on the
opposite side.
http://www.ridgesandfurrows.homestead.com/fingerprint_patterns.html
Fingerprint Patterns
• Tented Arch
– The tented arch pattern
consists of at least one
upthrusting ridge, which
tends to bisect superior
ridges at right angles,
more or less.
Fingerprint Patterns
• Simple Whirl
– The whorl pattern
consists of one or more
free recurving ridges and
two points of delta.
When the line of the
fingerprint disc is placed
on the two points of
delta, it will bisect at least
one of the ridges
belonging to the core
group.
Fingerprint Patterns
• Twinned Whirl
– In the twinned loop
pattern, the recurving
ridges present two loop
formations, separate and
apart. There are two
points of delta. The flows
for the deltas originate
from the same side of the
pattern.
Fingerprint Patterns
Loop (Ulnar or Radial)
• The loop pattern consists of one or more
free recurving ridges and one delta.
• In order to distinguish between ulnar
and radial loops you must:
1) know from which hand the loop
pattern comes from and;
2) place your hand palm side down
over top of the impression and
determine if the recurving ridges
originate from the little finger side or the
thumb side.
If the ridges flow in from the little finger
side this would be an 'ulnar' loop. If the
ridges flow in from the thumb side this
would be a 'radial' loop.
Additional Fingerprint Patterns
Central Pocket Loop
one or more free Composite
recurving ridges two or more different
and two points of patterns, separate
delta.
and apart exclusive
of the arch.
Lateral Pocket Loop
two loop
formations,
separate and
apart.
Fingerprint Reconstruction
• (a) - optical picture of a fingerprint,
• (b) - optical picture after binearization,
• (c) - reconstructed and enhanced acoustic picture of the same finger
• http://www.optel.com.pl/article/english/article2.htm
A B C
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