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Title: Shape measurement using one frame projected sawtooth fringe pattern
Authors: Chen, L.
Quan, C. 
Tay, C.J. 
Fu, Y. 
Keywords: Fringe projection
Phase retrieval
Phase unwrapping
Sawtooth fringe pattern
Issue Date: 15-Feb-2005
Citation: Chen, L., Quan, C., Tay, C.J., Fu, Y. (2005-02-15). Shape measurement using one frame projected sawtooth fringe pattern. Optics Communications 246 (4-6) : 275-284. ScholarBank@NUS Repository.
Abstract: Fringe projection technique is a non-contact, full field shape measurement method. The object depth information is recorded as sinusoidal or square wave fringe patterns. The phase-shifting technique or Fourier transform method can be used to extract wrapped phase data and a continuous phase distribution can be retrieved by a phase unwrapping process. In this paper, a shape measurement method using one frame projected sawtooth fringe pattern is proposed. A computer-generated sawtooth pattern is projected by a programmable liquid crystal display (LCD) projector. The deformed sawtooth pattern encoding object shape is converted to a wrapped phase map without using phase shifting or Fourier transform and a continuous phase distribution is retrieved by a quality-guided phase unwrapping algorithm. A special phase quality map, capable of detecting invalid shadowed phase data, is proposed to facilitate the unwrapping process. © 2004 Elsevier B.V. All rights reserved.
Source Title: Optics Communications
ISSN: 00304018
DOI: 10.1016/j.optcom.2004.10.079
Appears in Collections:Staff Publications

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