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Moiré pattern

About: Moiré pattern is a research topic. Over the lifetime, 1917 publications have been published within this topic receiving 27176 citations. The topic is also known as: moiré fringes & moire pattern.


Papers
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Journal ArticleDOI
TL;DR: In this paper, the transverse motion of the light source and the longitudinal motion of an object according to grating periods are analyzed and compared in projection moire topography, and the fringe sensitivity and its change increase as the grating period increases.
Abstract: In projection moire topography, the investigation of fringe sensitivity, which means the change rate of fringe order according to object height, is important and necessary to reduce the measurement error of the shape of an object. Using the fringe sensitivity, the determination of the absolute orders of moire fringes can be performed very easily and rapidly. The important parameters in the determination of absolute orders of fringes are the positions of light source and object, and the grating period in projection moire topography. Among these parameters, the fringe sensitivity due to the transverse motion of the light source and the longitudinal motion of the object according to grating periods are analyzed and compared. As a result, whereas the fringe sensitivity in the transverse-motion method increases linearly and gradually as the distance between light source and imaging sensor increases, the fringe sensitivity due to the longitudinal-motion method decreases dramatically as the distance between imaging lens and object increases. In these methods, the fringe sensitivity and its change increase as the grating period increases. Keywords: Projection Moire Topography, Moire fringe, fringe sensitivityOCIS codes: (120.4120) Moire’ techniques, (120.4640) Optical instruments, (100.3175) Interferometric imaging

3 citations

Journal ArticleDOI
TL;DR: In this article, Fourier analysis was used to analyze the effect of motif fringes in half-tone images and suggest that alterations to the form of the motif can eliminate the fringes.
Abstract: Arrays of motifs, such as are found in half-tone images, may exhibit moire fringes when they are generated by a defective scanning system. These moire effects are analysed by Fourier methods, which suggest that alterations to the form of the motif can eliminate the fringes. Three such techniques are described and demonstrated.

3 citations

Proceedings ArticleDOI
13 Jan 1998
TL;DR: In this article, an opto-electronic projection moire apparatus was developed for in-vitro studies of the eardrum, which was used to measure the shape and deformation of the Eardrum.
Abstract: An opto-electronic projection moire apparatus was developed for in-vitro studies of the eardrum. Moire topograms are generated by real-time video image subtraction, yielding 25 new interferograms per second. By using different reference images, both shape and deformation fringes can be obtained, without manipulating the object or the setup. Calibration measurements show a measuring precision of 5 micrometers . The setup is used to measure the shape and deformation of the eardrum. Parameters such as, for instance, the volume displacement of the pars flaccida, can be calculated from computer evaluations of the topograms.© (1998) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.

3 citations

Journal ArticleDOI
TL;DR: In this article, an analysis based on the modulation transfer function (MTF) is made of the photo-optical systems used to produce and record moire fringe patterns, and the influence of this filtering action on the largest strain that can be measured for a given amount of initial mismatch is discussed.
Abstract: an analysis based on the modulation-transfer function (MTF) is made of the photo-optical systems used to produce and record moire fringe patterns. The low-pass filtering capabilities of a real lens and film are demonstrated. The influence of this filtering action on the largest strain that can be measured for a given amount of initial mismatch is discussed. Simple techniques of optical low-pass filtering are presented that increase the quality of moire patterns that are to be processed automatically.

3 citations

Patent
31 May 2016
TL;DR: In this paper, the authors describe methods and apparatuses for creating superposition shape images by superposed base (102,107) and revealing (101) layers of lenslet gratings.
Abstract: The present invention describes methods and apparatuses for creating superposition shape images by superposed base (102,107) and revealing (101) layers of lenslet gratings. The superposition shape images form a message recognizable by a human observer or by an image acquisition and computing device such as a smartphone. The superposition shape images may be created by different superposition techniques ranging from 1D moire, 2D moire and level-line moire superposition techniques to lenticular image and phase shift superposition techniques. Moire superposition techniques enable creating superposition shape images at different apparent depth levels. Applications comprise the protection of documents and valuable articles against counterfeits, the creation of eye-catching advertisements as well as the decoration of buildings and exhibitions.

3 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023181
2022321
202126
202048
201946
201844