fingerprint analysis. fingerprints dmk4 dmk4
TRANSCRIPT
Fingerprint AnalysisFingerprint Analysis
FingerprintsFingerprints
http://www.youtube.com/watch?v=qX6hFXHDmk4
Francis GaltonFrancis Galton Established that no Established that no
two prints were two prints were __________________________
Noticed 3 patterns:Noticed 3 patterns:1.1.2.2.3.3.
identical
Whorls Arches Loops
Fingerprint PatternsFingerprint Patterns Are made up of a series Are made up of a series
of ______________ and of ______________ and __________________________
What makes them What makes them unique?unique? The ridge pattern and The ridge pattern and
minutiae pointsminutiae points
ridges valleys
Primates and Koalas
Fingerprint PrinciplesFingerprint Principles1. Fingerprints are individual
characteristics.
2. Fingerprint patter will remain unchanged for life.
3. Fingerprints have a general ridge patterns that allows them to be identified.
Fingerprint PatternsFingerprint PatternsLeft Hand
ArchesArches• Ridges enter and leave from __________________
sides.
Plain Arch Tented Arches
Spike or “tent”
opposite sides
Radial and Ulnar LoopsRadial and Ulnar Loops
Delta
• Have one ______• Enter and leave the print from______________
Ulnar LoopOpens toward the ulna/pinkie
Radial Loop opens toward the
radius/thumb
deltathe same side
VS
Radial vs Ulnar LoopsRadial vs Ulnar Loops
WhorlsWhorls• Have at least two ______
• “Ying yang”
Plain Whorl
Central Pocket Whorl
deltas
Double Loop Whorl
Delta
Accidental Whorl
•Does not fall under other patterns
Identify the PatternIdentify the Pattern
Identify the PatternIdentify the Pattern
Identify the PatternIdentify the Pattern
Identify each fingerprint pattern.Identify each fingerprint pattern.
Right Hand
Left Hand
Left Hand
Right Hand
Right Hand
It’s time to makesome prints!
Avoid Partial Prints
GOOD PRINTGet as much of the top part of your finger as possible!
Fingerprint IdentificationFingerprint Identification When do prints
match? When ridge
characteristics on two different prints match
No set standard for number of _______ UK requires 16 Australia requires 12
matches
Rid
ge C
har
acte
rist
ics
Use these characteristics as points of identification when comparing fingerprint samples. The more points you can find in common, the better the match!
http://cnx.org/content/m12574/latest/properties.jpg
Ridge Characteristics
Crossover
Core
Bifurcation (fork)
Ridge ending
Island
Delta
Pore
Scar
Identify . . . .Identify . . . .
http://www.dkfz.de/tbi/projects/bmcv/images/iu_it246_04s_fingerprint1.jpg
Identify . . . . . .
One more time . . . .
Identify . . . . .
Identify . . . . .
Identify . . . . .
Identify . . . . .
Can you destroy your Can you destroy your fingerprints?fingerprints?
________________What does scarring do to your fingerprints?What does scarring do to your fingerprints?
What is AFIS?What is AFIS?