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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.


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Journal ArticleDOI
TL;DR: In this article, the authors used a computer-generated grating (a reference pattern) to produce digital moire interference on the fabric, and then demodulated and processed with a phase-shifting technique so that moire fringes can be extracted and counted.
Abstract: Yarn density, or yarn count, in a woven fabric is an important parameter that influences fabric structure and properties. The measurement of yarn density often involves tedious, inaccurate procedures. This paper presents a new method developed for rapid and accurate measurement of yarn density. The method takes advantage of the structural features of a woven fabric, and uses a computer-generated grating (a reference pattern) to produce digital moire interference on the fabric. The moire image is then demodulated and processed with a phase-shifting technique so that moire fringes can be extracted and counted. From the relation between the pitches of the grating and the moire fringes, the yarn density can be calculated. This technique does not need complicated optical setting or an interferometer to form moire fringes with fabrics, permitting fast and accurate measurement of yarn densities.

3 citations

Journal ArticleDOI
TL;DR: In this paper, the authors examined the inherent sensitivity and resolution limitations of various moire techniques from the perspective of communication theory and showed that the sensitivity of traditional moire with amplitude gratings is no longer limited by the grating pitch when coherent optical techniques are used to extract the displacement field.

3 citations

Proceedings ArticleDOI
TL;DR: A non-contact system for obtaining three-dimensional objects topography that combines the fringe projection technique and the Talbot effect which is knowed like Talbot interferometry is presented.
Abstract: We present a non-contact system for obtaining three-dimensional objects topography The described system combines the fringe projection technique and the Talbot effect which is knowed like Talbot interferometry In fringe projection technique, the digitalization is realized when black and white lines are projected over the object and this image is captured by the CCD In Talbot interferometry, the object is collocated on one of the grating auto-image planes The deformed grating image is captured by the CCD and superposed with other reference one that can be physical or computer generated (virtual/synthetic) for obtaining a moire pattern which gives information about the object topography The topography of a coin and phalangeal articulation are obtained by using of this technique The Spatial Synchronous Detection and Fourier Method were incorporate to retrieve the phase

3 citations

Journal ArticleDOI
TL;DR: In this article , the authors studied hexagonal-boron-nitride (hBN)-supported graphene, in which moiré structures are formed due to lattice mismatch or interlayer rotation.
Abstract: By performing first-principles calculations, we studied hexagonal-boron-nitride (hBN)-supported graphene, in which moiré structures are formed due to lattice mismatch or interlayer rotation. A series of graphene/hBN systems has been studied to reveal the evolution of properties with respect to different twisting angles (21.78°, 13.1°, 9.43°, 7.34°, 5.1°, and 3.48°). Although AA- and AB-stacked graphene/hBN are gapped at the Dirac point by about 50 meV, the energy gap of the moiré graphene/hBN, which is much more asymmetric, is only about several meV. Although the Dirac cone of graphene residing in the wide gap of hBN is not much affected, the calculated Fermi velocity is found to decrease with the increase in the moiré super lattice constant due to charge transfer. The periodic potential imposed by hBN modulated charge distributions in graphene, leading to the shift of graphene bands. In agreement with experiments, there are dips in the calculated density of states, which get closer and closer to the Fermi energy as the moiré lattice grows larger.

3 citations

Journal ArticleDOI
TL;DR: A principled design procedure is introduced that allows one to design color screen sets that generate periodic, clustered-dot halftone patterns that improve color stability without increasing graininess.
Abstract: Digital halftoning is an essential part of the process for printing color, continuous-tone content. Traditionally, the highest quality has been achieved with analog, offset lithographic presses, using color screen sets that yield periodic, clustered-dot halftone patterns. Increasingly, these systems are being supplanted by digital presses that are based on either electrophotographic or inkjet marking processes. Due to the inherent instability of the electrophotographic marking process, periodic, clustered-dot halftone patterns are also widely used with such presses. However, digital presses have much lower resolution than their analog counterparts. Simply mimicking the traditional screen designs used with commercial, offset presses will result in halftone patterns that are more susceptible to moire due to the interaction between the periodic patterns used to render the different color channels. This causes instability in the printed colors. The moire can be reduced by increasing the frequency of the halftone patterns. But this may make the print appear grainier than its analog counterpart. In this paper, we introduce a principled design procedure that allows one to design color screen sets that generate periodic, clustered-dot halftone patterns that improve color stability without increasing graininess. We present experimental results to support the benefits of our new color screen set design framework.

3 citations


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