Fingerprint
Images
Forensics
Mr. Foster
LOOP
WHORL
ARCH
Calculating
Primary Henry Classification
Each Finger is given a point value
Calculate your
Primary Henry Classification
Assign the number of points for each finger that has a
whorl and substitute into the equation:
right
right
left
left
left
index
ring
thumb
middle
little
16 + 8 +
4
+
2 + 1
right
right
right
left
left
thumb
middle
little
index
ring
16 + 8
+1
+ 4 + 2 +
=
+1
1
Only add the number if you have a whorl on the finger!
Frequency of Fingerprint Patterns
Secondary Henry Classification
Loops
Whorls
Arches
65%
30%
5%
There are more than 3 pattern
classifications.
TYPES OF FINGERPRINT PATTERNS
Right hand
TENTED ARCH
Ulnar
PLAIN LOOP
WHORL
CENTRAL POCKET WHORL
DOUBLE LOOP
ACCIDENTAL WHORL
PLAIN ARCH
Right hand
Radial
PLAIN LOOP
LATERAL POCKET LOOP
Mushroom shape
thumb side
Pinky side
Frequency of Fingerprint Patterns
Secondary Henry Classification
Loops
Whorls
Arches
65%
30%
5%
More specific %’s for categories of each pattern type
Ulnar
Radial
Plain
Other
Plain
Tented
60%
5%
20%
10%
4%
1%
Fingerprint Lab and Probability
Secondary Henry Classification
2. What would happen to your probabilities if
you incorporated the more specific %’s?
Minutiae
Or
Triradius
Activity #2
Identify
1-15
Activity #3- look at the
handout and identify prints
that came from the same
finger.
KEY
Key to Fingerprint Matching
Worksheet
• A = G = S This one is interesting; there are three separate
impressions of the same finger with some very unique
features.
• B = no match
• C = no match
• D = no match
• E=T
• F=J
• H=R
• I = no match
• K=O
• L = no match
• M=P
• N=Q