scholarly journals Absolute phase retrieval for colored objects based on three phase-shifting amount codes

2020 ◽  
Vol 28 (26) ◽  
pp. 38491
Author(s):  
Han Yuan ◽  
HongRu Li ◽  
GuoYing Feng ◽  
ZhongYi Bao ◽  
Wei Li ◽  
...  
Keyword(s):  
Phase Retrieval ◽  
Phase Shifting ◽  
Absolute Phase ◽  
Three Phase

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.

Phase-shifting coding method for absolute phase retrieval

2019 ◽  
Vol 58 (10) ◽  
pp. 1
Author(s):  
Han Yuan ◽  
Guoying Feng ◽  
Hongru Li ◽  
Lei Cui ◽  
Zhongyi Bao
Keyword(s):  
Phase Retrieval ◽  
Phase Shifting ◽  
Absolute Phase ◽  
Coding Method

A flexible phase-shifting method with absolute phase marker retrieval

Measurement ◽  
2012 ◽  
Vol 45 (1) ◽  
pp. 101-108 ◽  
Author(s):  
Haihua Cui ◽  
Wenhe Liao ◽  
Ning Dai ◽  
Xiaosheng Cheng
Keyword(s):  
Phase Shifting ◽  
Absolute Phase ◽  
Phase Shifting Method

Phase-shifting digital holography with an unknown reference beam

2021 ◽  
Author(s):  
Roghayeh Yazdani ◽  
Hamidreza Fallah
Keyword(s):  
Digital Holography ◽  
Phase Retrieval ◽  
Reference Beam ◽  
Phase Shifting ◽  
Retrieval Algorithm ◽  
Reference Field ◽  
Digital Holograms ◽  
Noisy Conditions ◽  
Phase Retrieval Algorithm

In digital holography, errors of the reference field degrade the quality of the reconstructed object field. In this paper, we propose an effective method in phase-shifting digital holography in which the reference field does not need to be known and perfect. The unknown complex amplitudes of both reference and object fields are derived simultaneously. The method employs only five digital holograms and a single execution of a phase retrieval algorithm. So, the required measurements and algorithm executions in this method are fewer than those in other methods; it suggests a simpler and faster method. The effectiveness of the suggested method is indicated by simulation, under noise-free and noisy conditions. Moreover, the capability of the method to extract full information about the phase singularities in both fields is demonstrated.

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