Polarization-based and specular-reflection-based noncontact latent fingerprint imaging and lifting.
In forensic science the finger marks left unintentionally by people at a crime scene are referred to as latent fingerprints. Most existing techniques to detect and lift latent fingerprints require application of a certain material directly onto the exhibit. The chemical and physical processing applied to the fingerprint potentially degrades or prevents further forensic testing on the same evidence sample. Many existing methods also have deleterious side effects. We introduce a method to detect and extract latent fingerprint images without applying any powder or chemicals on the object. Our method is based on the optical phenomena of polarization and specular reflection together with the physiology of fingerprint formation. The recovered image quality is comparable to existing methods. In some cases, such as the sticky side of tape, our method shows unique advantages.
Lin
Shih-Schön
SS
Electrical and Systems Engineering Department, University of Pennsylvania, 220 South 33rd, Moore 203, Philadelphia, 19104-6390, USA.
Yemelyanov
Konstantin M
KM
Pugh
Edward N
EN
Engheta
Nader
N
D001699:Biometry / Q000379:methods*; D003878:Dermatoglyphics; D005385:Fingers / Q000033:anatomy & histology*; D006801:Humans; D007090:Image Interpretation, Computer-Assisted / Q000379:methods*; D010783:Photometry / Q000379:methods*; D012031:Refractometry / Q000379:methods*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D012867:Skin / Q000033:anatomy & histology*