Journal
OPTICS AND LASERS IN ENGINEERING
Volume 48, Issue 5, Pages 561-569Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.optlaseng.2009.12.002
Keywords
3-D shape measurement; Optical metrology; Digital fringe projection; Fringe analysis; Optical metrology; Defocusing
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There are two approaches to generate sinusoidal fringe patterns with a digital-light-processing (DLP) projector: defocusing binary patterns (DBP), and focusing sinusoidal patterns (FSP). This paper will compare the potential errors for both methods induced by the following factors: (1) degree of defocusing, (2) exposure time, (3) synchronization, and (4) projector's nonlinear gamma. Experiments show that in most scenarios, the error for the DBP method is smaller than that of the FSP method. Therefore, generating a sinusoidal fringe image using a DBP method seems to be appealing. (C) 2009 Elsevier Ltd. All rights reserved.
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