Homodyne assisted multistep phase shifting in phase-resolved optical technique for latent fingerprint imaging

U. S. Dinish; Zhixia Chao; Vadakke Matham Murukeshan; Leong Keey Seah

doi:10.1117/1.1812326

1 December 2004 Homodyne assisted multistep phase shifting in phase-resolved optical technique for latent fingerprint imaging

U. S. Dinish, Zhixia Chao, Vadakke Matham Murukeshan, Leong Keey Seah

Author Affiliations +

Optical Engineering, Vol. 43, Issue 12, (December 2004). https://doi.org/10.1117/1.1812326

Abstract

A novel homodyne signal processing assisted phase-resolved optical system for the imaging of latent fingerprints is proposed. A multistep phase shifting method is introduced to remove the DC part of the fluorescence signals. Experiments are carried out with simulated fingerprint samples where their lifetime and emission wavelength are in close range to that of background fluorescence. The proposed phase-resolved technique can suppress the background fluorescence provided there is lifetime difference between two emissions.

©(2004) Society of Photo-Optical Instrumentation Engineers (SPIE)

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U. S. Dinish, Zhixia Chao, Vadakke Matham Murukeshan, and Leong Keey Seah "Homodyne assisted multistep phase shifting in phase-resolved optical technique for latent fingerprint imaging," Optical Engineering 43(12), (1 December 2004). https://doi.org/10.1117/1.1812326

Published: 1 December 2004

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