UV Shadow Moiré for Specular and Large Surface Shape Measurement

2014 ◽  
pp. 73-79
Author(s):  
Changwoon Han
Keyword(s):  
Surface Shape ◽  
Shape Measurement ◽  
Shadow Moire ◽  
Shadow Moiré

An accurate method to calibrate shadow moiré measurement sensitivity

2019 ◽  
Vol 30 (12) ◽  
pp. 125021
Author(s):  
Wei Zhang ◽  
Fulong Zhu ◽  
Shenghuai Wang ◽  
Pengyan Lu ◽  
Xin Wu
Keyword(s):  
Accurate Method ◽  
Measurement Sensitivity ◽  
Shadow Moire ◽  
Shadow Moiré

scholarly journals Shadow Moiré technique for postural assessment: qualitative assessment protocol by intra- and inter-rater evaluation

2017 ◽  
Vol 29 (2) ◽  
pp. 356-360
Author(s):  
José Nunes da Silva Filho ◽  
Luiz Alberto Batista ◽  
Jonas Lírio Gurgel ◽  
Flávia Porto
Keyword(s):  
Qualitative Assessment ◽  
Assessment Protocol ◽  
Shadow Moire ◽  
Shadow Moiré ◽  
Postural Assessment

scholarly journals Computer-automated shadow moiré method and applications for 3D surface profiling

2021 ◽  
Author(s):  
Rui Zhao
Keyword(s):  
Least Square ◽  
Automated System ◽  
Image Subtraction ◽  
Full Field ◽  
Surface Profiling ◽  
Shadow Moire ◽  
Shadow Moiré ◽  
3D Surface ◽  
Measurement Resolution ◽  
Moire Method

Among numerous methods for 3D surface profiling, classic shadow moiré method has been kept as the most popular one due to its full-field feature and low cost. This thesis focuses on a computer-vision shadow moiré method with a scope to improve the measurement resolution, accuracy and efficiency. The computer automation is basically realized through the introduction of a phase-shifting technique that is incorporated with a new multi-grid least-square unwrapping algorithm. The method is enhanced by implementing a few additional image processing techniques. These techniques, when implemented, result in improved measurement accuracy and enable easy applications to irregularly shaped surfaces. The study also proposes a new, automated system calibration approach that is based on a real-time image subtraction. A data normalization process is studied to resolve possible confusions in the presentation of the original data. The verification test results show that the modified shadow moiré technique has achieved the initial goal, in that the measurement resolution now reaches a few percentage of the fringe sensititivity.

scholarly journals Morphology Evaluation of Microelectronic Packaging Substrates Using Shadow Moiré Technique

IEEE Access ◽  
2018 ◽  
Vol 6 ◽  
pp. 33099-33110
Author(s):  
Fulong Zhu ◽  
Xinxin Lin ◽  
Wei Zhang ◽  
Jiajie Fan ◽  
Sheng Liu
Keyword(s):  
Microelectronic Packaging ◽  
Shadow Moire ◽  
Shadow Moiré
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