|Posted on Saturday, January 15, 2005 - 08:36 am: ||
Fingerprint classification formulas are systems of assigning numbers and letters to represent nonspecific information such as the general fingerprint ridge pattern shape, limited ridge flow or contour information, and some limited ridge counts between common and easily recognizable "landmarks" (such as triangular shapes called deltas and the center of pattern areas called cores). The classification formula/line on a fingerprint card may also include acronyms or abbreviations to indicate the person's sex, age, the presence of scars in pattern areas and other data used to break down a large collection of fingerprint records into smaller groups for faster manual searching.
With the implementation of AFIS in the past three decades, such classification is not routinely done at many agencies and many systems do not differentiate beyond basic loops, arches and whorl patterns. For a variety of reasons, fingerprint experts still learn and occasionally use fingerprint classification formulas.
Click here to visit an FBI site about taking legible fingerprints. You might also consider using common materials already in your home to record fingerprints.
Because a fingerprint formula can be identical for many persons, yet the Level 2 and 3 detail different, it may be more meaningful to your science project if you merely compare the pattern types and then show the results of your comparison of Level 2 and 3 details (similarities and differences).
Boring example of only a portion of the rules used to classify fingerprints:
Classification formulas are relatively complicated and include many components. In the English-speaking areas of the world, the Henry system (often with modifications) is the most common classification system. The first component of the Henry classification is called "the primary" and it is derived from the presence or absence of whorls in the ten fingers. There are 1,024 possible combinations in the primary, ranging "1 over 1" to "32 over 32." Whorls in the right thumb and right index finger have a value of 16, whorls in the right middle and ring finger have a value of 8, whorls in the right little finger and left thumb have a value of 4, whorls in the left index and left middle finger have a value of 2, and whorls in the left ring and left little finger have a value of 1. The numerator of the primary Henry classification is obtained by totaling the whorl values for the right thumb, right middle finger, right little finger, left index finger and left ring finger, plus 1. The denominator of the primary Henry classification is obtained by totaling the whorls values of the other five fingers, plus 1. Thus, no whorls in any of the ten fingers has a primary classification of 1 over 1, all whorls has a primary classification of 32 over 32, and whorls in only the thumbs has a primary classification of 5 over 17. After the primary is computed, next comes the secondary, major, key, final (and a host of modifications in large files). Click here to read fingerprint classification rules in a Project Gutenburg version of the FBI publication "The Science of Fingerprints - Classifications and Uses."
|Posted on Friday, January 14, 2005 - 05:42 pm: ||
im doing a science project to see if anyone in my family has the same fingerprint formula as me .
where should i go?
|Posted on Friday, January 14, 2005 - 05:38 pm: ||
are there any websites that i can go to to find out how to take fingerprints of people?