scholarly journals Flexible Digital Fringe Projection System for Step-height Measurement

2010 ◽  
Author(s):  
Song Zhang ◽  
James Oliver ◽  
Pramod K. Rastogi ◽  
Erwin Hack
Keyword(s):  
Step Height ◽  
Fringe Projection ◽  
Height Measurement ◽  
Projection System ◽  
Digital Fringe Projection

scholarly journals Autofocusing method for a digital fringe projection system with dual projectors

2020 ◽  
Vol 28 (9) ◽  
pp. 12609 ◽  
Author(s):  
Min Zhong ◽  
Xiaowei Hu ◽  
Feng Chen ◽  
Chao Xiao ◽  
Duan Peng ◽  
...  
Keyword(s):  
Fringe Projection ◽  
Projection System ◽  
Digital Fringe Projection

scholarly journals Absolute Phase Retrieval Using One Coded Pattern and Geometric Constraints of Fringe Projection System

2018 ◽  
Vol 8 (12) ◽  
pp. 2673 ◽  
Author(s):  
Xu Yang ◽  
Chunnian Zeng ◽  
Jie Luo ◽  
Yu Lei ◽  
Bo Tao ◽  
...  
Keyword(s):  
Phase Shift ◽  
Phase Retrieval ◽  
Code Word ◽  
Geometric Constraints ◽  
Fringe Projection ◽  
Average Intensity ◽  
Fringe Order ◽  
Projection System ◽  
Absolute Phase ◽  
Three Phase

Fringe projection technologies have been widely used for three-dimensional (3D) shape measurement. One of the critical issues is absolute phase recovery, especially for measuring multiple isolated objects. This paper proposes a method for absolute phase retrieval using only one coded pattern. A total of four patterns including one coded pattern and three phase-shift patterns are projected, captured, and processed. The wrapped phase, as well as average intensity and intensity modulation, are calculated from three phase-shift patterns. A code word encrypted into the coded pattern can be calculated using the average intensity and intensity modulation. Based on geometric constraints of fringe projection system, the minimum fringe order map can be created, upon which the fringe order can be calculated from the code word. Compared with the conventional method, the measurement depth range is significantly improved. Finally, the wrapped phase can be unwrapped for absolute phase map. Since only four patterns are required, the proposed method is suitable for real-time measurement. Simulations and experiments have been conducted, and their results have verified the proposed method.

Dynamics range enhancement in digital fringe projection technique

2015 ◽  
Vol 39 ◽  
pp. 243-251 ◽  
Author(s):  
Gelareh Babaie ◽  
Mehrdad Abolbashari ◽  
Faramarz Farahi
Keyword(s):  
Fringe Projection ◽  
Projection Technique ◽  
Digital Fringe Projection
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