Spatial-carrier phase-shifting digital holography utilizing spatial frequency analysis for the correction of the phase-shift error

2012 ◽  
Vol 37 (2) ◽  
pp. 148 ◽  
Author(s):  
Tatsuki Tahara ◽  
Yuki Shimozato ◽  
Yasuhiro Awatsuji ◽  
Kenzo Nishio ◽  
Shogo Ura ◽  
...  
Keyword(s):  
Phase Shift ◽  
Spatial Frequency ◽  
Frequency Analysis ◽  
Carrier Phase ◽  
Digital Holography ◽  
Phase Shifting ◽  
Phase Shift Error ◽  
Carrier Phase Shifting ◽  
Spatial Frequency Analysis

scholarly journals Color Digital Holography Based on Generalized Phase-Shifting Algorithm with Monitoring Phase-Shift

Photonics ◽  
2021 ◽  
Vol 8 (7) ◽  
pp. 241
Author(s):  
Minwoo Jung ◽  
Hosung Jeon ◽  
Sungjin Lim ◽  
Joonku Hahn
Keyword(s):  
Phase Shift ◽  
Focal Plane ◽  
Digital Holography ◽  
Phase Shifter ◽  
Phase Shifting ◽  
Signal Wave ◽  
Color Filter ◽  
Object Image ◽  
Phase Shift Error ◽  
Monitoring Phase

Color digital holography (DH) has been researched in various fields such as the holographic camera and holographic microscope because it acquires a realistic color object wave by measuring both amplitude and phase. Among the methods for color DH, the phase-shifting DH has an advantage of obtaining a signal wave of objects without the autocorrelation and conjugate noises. However, this method usually requires many interferograms to obtain signals for all wavelengths. In addition, the phase-shift algorithm is sensitive to the phase-shift error caused by the instability or hysteresis of the phase shifter. In this paper, we propose a new method of color phase-shifting digital holography with monitoring the phase-shift. The color interferograms are recorded by using a focal plane array (FPA) with a Bayer color filter. In order to obtain the color signal wave from the interferograms with unexpected phase-shift values, we devise a generalized phase-shifting DH algorithm. The proposed method enables the robust measurement in the interferograms. Experimentally, we demonstrate the proposed algorithm to reconstruct the object image with negligibly small conjugate noises.

Compensation algorithm for the phase-shift error of polarization-based parallel two-step phase-shifting digital holography

2010 ◽  
Vol 50 (7) ◽  
pp. B31 ◽  
Author(s):  
Tatsuki Tahara ◽  
Kenichi Ito ◽  
Takashi Kakue ◽  
Motofumi Fujii ◽  
Yuki Shimozato ◽  
...  
Keyword(s):  
Phase Shift ◽  
Digital Holography ◽  
Phase Shifting ◽  
Compensation Algorithm ◽  
Phase Shift Error

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.

Sign in / Sign up

Export Citation Format

Share Document