10.1364/OE.17.007818.m001 Eun-Hee Kim Eun-Hee Kim Joonku Hahn Joonku Hahn Hwi Kim Hwi Kim Byoungho Lee Byoungho Lee Media 1: Profilometry without phase unwrapping using multi-frequency and four-step phase-shift sinusoidal fringe projection Optica Publishing Group 2009 four-step phase-shift multi-frequency phase unwrapping media Optics Express 11 May 2009 fringe projection Profilometry oe 2009-05-11 00:00:00 Media https://opticapublishing.figshare.com/articles/media/Media_1_Profilometry_without_phase_unwrapping_using_multi-frequency_and_four-step_phase-shift_sinusoidal_fringe_projection/4939016 Originally published in Optics Express on 11 May 2009 (oe-17-10-7818)