We comment on the recent Letter by Chen and Quan [ Opt. Lett. 30, 2101 (2005) ] in which a least-squares approach was proposed to cope with the nonparallel illumination in fringe projection profilometry. It is noted that the previous mathematical derivations of the fringe pitch and carrier phase functions on the reference plane were incorrect. In addition, we suggest that the variation of carrier phase along the vertical direction should be considered.
© 2006 Optical Society of America
(120.2830) Instrumentation, measurement, and metrology : Height measurements
(120.5050) Instrumentation, measurement, and metrology : Phase measurement
(120.6650) Instrumentation, measurement, and metrology : Surface measurements, figure
Instrumentation, Measurement, and Metrology
Original Manuscript: January 4, 2006
Manuscript Accepted: March 10, 2006
Zhaoyang Wang and Hongbo Bi, "Comment on "Fringe projection profilometry with nonparallel illumination: a least-squares approach"," Opt. Lett. 31, 1972-1973 (2006)
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