Journal
OPTICS AND LASERS IN ENGINEERING
Volume 50, Issue 11, Pages 1538-1541Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.optlaseng.2012.06.005
Keywords
Fringe analysis; 3D shape measurement; Phase shifting; Absolute phase
Categories
Funding
- Div Of Civil, Mechanical, & Manufact Inn
- Directorate For Engineering [1150711] Funding Source: National Science Foundation
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This paper presents a method to recover absolute phase by using only four images: three phase-shifted patterns and one stair pattern. The stair pattern is designed in such a way that the stair changes are perfectly aligned with the phase jumps, and thus absolute phase can be recovered by referring to the stair pattern. Due to system noises and camera and/or projector blurring, a computational framework is also proposed. Because this technique only requires four fringe images for absolute phase recovery, it has the merit of measurement speed. And since the absolute phase is obtained, this technique is suitable for measuring step-height objects. We have developed a digital fringe projection system to verify the performance of the proposed technique. (C) 2012 Elsevier Ltd. All rights reserved.
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