Abstract
A novel homodyne signal processing assisted phase-resolved optical system for the imaging of latent fin- gerprints is proposed. A multistep phase shifting method is introduced to remove the DC part of the fluorescence sig- nals. Experiments are carried out with simulated fingerprint samples where their lifetime and emission wavelength are in close range to that of background fluorescence. The pro- posed phase-resolved technique can suppress the back- ground fluorescence provided there is lifetime difference be- tween two emissions. © 2004 Society of Photo-Optical
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