Proceedings ArticleDOI
Calibration method for angular measurement of moiré patterns
Fan He,Jian Bai,Kaiwei Wang,Xiyun Hou,Jiang Yao +4 more
- Vol. 9282, pp 306-313
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TLDR
In this paper, a high-accuracy calibration method for angular measurement of deformed and curved Moire patterns, based on template matching algorithm, is presented, which is a feasible and accurate method based on Talbot interferometry and Moire deflectometry.Abstract:
In this paper, a high-accuracy calibration method for angular measurement of deformed and curved Moire patterns, based on template matching algorithm, is presented. We report a feasible and accurate method, based on Talbot interferometry and Moire deflectometry, to measure long focal-length lenses. Theoretical analysis indicates that the precision of this method is mainly influenced by the angle of Moire patterns. However, it’s difficult to obtain high-accuracy angle of Moire patterns, since the Moire patterns derived from experiment are constantly deformed or curved. We demonstrate a method, based on template matching algorithm, to calibrate deformed and curved Moire patterns, thus their angle can be calculated fast and accurately in sub-pixel domain. Numerical analysis and simulation prove that the method mentioned above demonstrates high precision and stability, and experiment results show that the accuracy of the long focal lengths measurement is improved obviously.read more
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Journal Article
[Analyzing moiré pattern spectra based on the mutual transform between signals' waveform in time domain and their spectra in frequency space].
Tao Sun,Yi-Zhong Song +1 more
TL;DR: The mutual evolving processes of signals' waveforms and their spectra were numerically analyzed in time and frequency domains and the mutual transform principle was applied to analyze moiré pattern spectra, acquiring phase distribution information of the pattern.
Journal ArticleDOI
Interactive Moiré Patterns Reflecting on the Traditional Nanjing Baiju
TL;DR: In this paper , a human-machine design approach to the artistic and metaphorical representation of the traditional weaving scenes featured on Yunjin brocade as interactive moiré patterns accompanied by Nanjing Baiju performance is presented.
References
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Journal ArticleDOI
Talbot interferometry for measuring the focal length of a lens.
Yoshiaki Nakano,Kazumi Murata +1 more
TL;DR: A method for measuring the focal length of lenses using the Talbot effect and the moire technique is described, and the focal lengths of positive, negative, and power-distributed lenses are measured.
Journal ArticleDOI
Measurements of phase objects using the Talbot effect and moire techniques.
Yoshiaki Nakano,Kazumi Murata +1 more
TL;DR: The moire fringes are generated by superimposing the Fourier image of the first grating on the second one in the interferometer to examine the deflection of light by the phase objects.
Journal ArticleDOI
Precise focal-length measurement technique with a reflective Fresnel-zone hologram.
Brian J. DeBoo,Jose Sasian +1 more
TL;DR: A new technique for precise focal-length measurement with a hologram is presented and offers the additional benefit of easy characterization by use of the same interferometer employed in examining the test optic.
Journal ArticleDOI
Talbot interferometry for measuring the small tilt angle variation of an object surface.
Yoshiaki Nakano,Kazumi Murata +1 more
TL;DR: This Letter presents a simple method for measuring the small tilt angle variation of an object surface based on Talbot interferometry, which can be easily tuned by varying the crossed angle between two gratings.
Journal ArticleDOI
A two-dimensional fast Fourier transform method for measuring the inclination angle of parallel fringe patterns
S. De Nicola,Pietro Ferraro +1 more
TL;DR: In this article, a technique based on two-dimensional fast Fourier fringe analysis for the automated evaluation of the inclination angle of parallel fringe patterns is described and numerical results of the angle evaluation error using this algorithm are discussed.
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