A Wide-Band Approach to the Absolute Phase Retrieval in SAR Interferometry

2003 ◽  
pp. 183-205 ◽  
Author(s):  
N. Veneziani ◽  
F. Bovenga ◽  
A. Refice
Keyword(s):  
Phase Retrieval ◽  
Wide Band ◽  
Sar Interferometry ◽  
Absolute Phase ◽  
The Absolute

scholarly journals The Absolute Magnitude of the Early-Type MK Standards From Hipparcos Parallaxes

1998 ◽  
Vol 11 (1) ◽  
pp. 566-566
Author(s):  
C. Jaschek ◽  
A.E. Gómez
Keyword(s):  
Main Sequence ◽  
Rotational Velocity ◽  
Wide Band ◽  
Absolute Magnitude ◽  
Interstellar Extinction ◽  
Early Type ◽  
Class V ◽  
Luminosity Class ◽  
The Absolute ◽  
Absolute Magnitudes

We have analysed the standards of the MK system in the B0-F5 spectral region with the help of Hipparcos parallaxes, using only stars for which the error on the absolute magnitude is ≤ 0.3 mag. The sample stars (about one hundred) were scrutinized for companions and for interstellar extinction. We find that the main sequence is a wide band and that, although in general giants and dwarfs have different absolute magnitudes, the separation between luminosity class V and III is not clear. We conclude that there is no strict relation between luminosity class and absolute magnitude. The relation is only a statistical one and has a large intrinsic dispersion. We have analysed similarly the system of standards defined by Garrison and Gray (1994) separating low and high rotational velocity standards. We find similar effects as in the original MK system.

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.

Joint coding strategy of the phase domain and intensity domain for absolute phase retrieval

2021 ◽  
pp. 1-1
Author(s):  
Yabing Zheng ◽  
Yi Jin ◽  
Minghui Duan ◽  
Changan Zhu ◽  
Enhong Chen
Keyword(s):  
Phase Retrieval ◽  
Phase Domain ◽  
Absolute Phase ◽  
Coding Strategy ◽  
Joint Coding

scholarly journals Phase coding method for absolute phase retrieval with a large number of codewords

2012 ◽  
Vol 20 (22) ◽  
pp. 24139 ◽  
Author(s):  
Dongliang Zheng ◽  
Feipeng Da
Keyword(s):  
Phase Retrieval ◽  
Phase Coding ◽  
Absolute Phase ◽  
Coding Method
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