scholarly journals Online fringe pitch selection for defocusing a binary square pattern projection phase-shifting method

2020 ◽  
Vol 28 (21) ◽  
pp. 30710
Author(s):  
Yang Hu ◽  
Zhen Liu ◽  
Dongze Yang ◽  
Chenggen Quan
Keyword(s):  
Phase Shifting ◽  
Pattern Projection ◽  
Phase Shifting Method ◽  
Selection For

scholarly journals Birefringence measurement by four-step phase-shifting method on triple-polarizer plane polariscope

2013 ◽  
Vol 52 (4) ◽  
pp. 040501 ◽  
Author(s):  
Xusheng Zhang ◽  
Chuan He ◽  
Haoyu Wang
Keyword(s):  
Phase Shifting ◽  
Phase Shifting Method

Phase-shifting method with a normal polariscope

1999 ◽  
Vol 38 (28) ◽  
pp. 5931 ◽  
Author(s):  
Anand Asundi ◽  
Liu Tong ◽  
Chai Gin Boay
Keyword(s):  
Phase Shifting ◽  
Phase Shifting 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

Real-time analysis of isochromatics and isoclinics using the phase-shifting method

2003 ◽  
Vol 43 (1) ◽  
pp. 83-89 ◽  
Author(s):  
S. Yoneyama ◽  
Y. Morimoto ◽  
T. Nomura ◽  
M. Fujigaki ◽  
R. Matsui
Keyword(s):  
Real Time ◽  
Phase Shifting ◽  
Time Analysis ◽  
Real Time Analysis ◽  
Phase Shifting Method

scholarly journals Superfast phase-shifting method for 3-D shape measurement

2010 ◽  
Vol 18 (9) ◽  
pp. 9684 ◽  
Author(s):  
Song Zhang ◽  
Daniel Van Der Weide ◽  
James Oliver
Keyword(s):  
Phase Shifting ◽  
Shape Measurement ◽  
Phase Shifting Method

Microscopic Surface Measurement Using Phase Shifting Method

2015 ◽  
Vol 771 ◽  
pp. 200-203 ◽  
Author(s):  
Suprijanto ◽  
Naila Zahra ◽  
E. Juliastuti
Keyword(s):  
Surface Profile ◽  
Skin Surface ◽  
Phase Shifting ◽  
Phase Image ◽  
Accurate Information ◽  
Profile Measurement ◽  
Imaging Device ◽  
Skin Imaging ◽  
Digital Microscope ◽  
Phase Shifting Method

Accurate information of microscopic topography is very important for efficacy assessment of a surface texture of skin health. Due to the limitations of the direct visual assessment of skin microscopic topography, an optical dermastocopy is very common to be used as skin imaging device to magnify skin topography based on a white light reflection. The limitation of this method is its poor spatial resolution to quantify skin topography. In this work, microscopic skin imaging based on phase shifting method is configured using a DLP pico-projector with LED illumination and a handheld digital microscope. As illuminator for the digital microscope, the DLP projector is programmed to generate patterned light on skin surface. Image processing is required in providing accurate information of surface topography. The first step, a wrapped phase shifting must be extracted from acquired intensity images. The second step is obtaining unwrapped phase image, which is a critical process because it must be recovered from wrapped phase shifting that containednoise. Finally, phase offset due to multiples of 2π during phase unwrapping must be removed. Early experiments on simple object are carried out to test the level of distortion of fringe in several variations of contrast and also to test the performance of the system on several frequency variations. The test results indicate the depth proportion obtained from absolute phase image has the same trend as the proportion of direct measurement. Implementation on the skin surface profile performed on three test areas: the back of the hand and knuckle creases. Based on quantitative and qualitative analysis,our proposed scheme of skin imaging based on phase shifting is promising for surface profile measurement and imaging of the skin.

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