Absolute phase calculation from one composite RGB fringe pattern image by windowed Fourier transform algorithm

2010 ◽  
Author(s):  
Zonghua Zhang ◽  
Zhao Jing ◽  
Hui Feng ◽  
Haiyan Ma ◽  
Tong Guo ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Fringe Pattern ◽  
Windowed Fourier Transform ◽  
Absolute Phase ◽  
Phase Calculation

Multi-STFT for adaptive SCPS phase determination

2009 ◽  
Vol 17 (4) ◽  
Author(s):  
R. Sitnik
Keyword(s):  
Fourier Transform ◽  
Carrier Phase ◽  
Fringe Pattern ◽  
Phase Shifting ◽  
Shape Measurement ◽  
Step Method ◽  
Phase Determination ◽  
3D Shape Measurement ◽  
Phase Calculation ◽  
Carrier Phase Shifting

AbstractThis paper presents a fast and reliable approach for phase modulo 2π-calculation from a single fringe pattern. It calculates correct phase values even for very complex and variable shape gradients based on a locally variable fringe period determined for the entire image. In the paper, a new two-step method for wrapped phase calculation is proposed. It is performed through the use of a method based on a multiple local fast Fourier transform for estimation of a local fringes period map and a 5-point spatial carrier phase shifting (SCPS) formula for phase modulo 2π-calculation. The described approach is verified by a correct demodulation of a real fringe pattern taken by a 3D-shape measurement system.

Absolute phase calculation from one composite RGB fringe pattern image by wavelet transform algorithm

2011 ◽  
Author(s):  
Zhaohui Wang ◽  
Zhao Jing ◽  
Zonghua Zhang ◽  
Tong Guo ◽  
Sixiang Zhang ◽  
...  
Keyword(s):  
Wavelet Transform ◽  
Fringe Pattern ◽  
Absolute Phase ◽  
Phase Calculation
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