Topic
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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TL;DR: In this paper, the Fourier transform moire and grid method is extended to analyze strain distributions from the image of a fringe pattern with carrier fringes obtained by moire interferometry.
Abstract: The Fourier transform moire and grid method, which we previously presented, is extended to analyze strain distributions from the image of a fringe pattern with carrier fringes obtained by moire interferometry. The characteristics of the carrier fringes and the procedure of obtaining strain distributions are explained in the spatial frequency domain. The fringe pattern without carrier fringes is obtained from the fringe pattern with carrier fringes by extracting the first harmonic of the spectrum of the fringe pattern with carrier fringes and shifting it. The strain distribution is obtained by analyzing the phase of the image obtained from the inverse Fourier transform of the shifted first harmonic. Strain distributions of a composite material with a wavy ply under compressive loading are analyzed.
11 citations
TL;DR: A procedure is proposed to choose the optimal sampling parameters (pixel spacing and scanning rotation) for the STEM Moiré GPA application on any single crystal material and is applied on a InP/InAs1-xPx/InP stack grown by Molecular Beam Epitaxy.
11 citations
15 Dec 1992
TL;DR: An optical surface profiler (OSP130) was developed for the metrology of master tooling used in the coin stamping process as mentioned in this paper, which measured the surface relief of tools ranging in diameter from 10 mm to 300 mm.
Abstract: An Optical Surface Profiler (OSP130) has been developed for the metrology of master tooling used in the coin stamping process. The OSP130 measure, in a non-contacting manner, the surface relief of tools ranging in diameter from 10 mm to 300 mm. Rapid measurements are performed simultaneously on a large grid of equispaced points across the surface of the tool. From the relief data, many parameters such as the location of high and low features, volume of impression, background curvatures and various diameters can be quickly evaluated. The technique used is phase-shifting moire profilometry. A white light projector illuminates a periodic transmission grating which is then imaged onto the object surface. The light pattern on the object is viewed by a high resolution TV camera connected to a computer. The grating is shifted under computer control to a number of positions and corresponding intensity images of the deformed pattern on the object surface are stored in the computer. From the intensity images a phase map, representing the deformation of the periodic grating by the surface relief, is evaluated and compared with an undeformed pattern. This results in an accurate contour map of the surface relief with an uncertainty less than 1% of the relief excursion on the object. Details of the instrument and its use at the Royal Australian Mint are presented.
11 citations
Patent•
19 Jan 1999
TL;DR: In this article, the interference between the regular pattern of pixel lines formed on a liquid crystal panel and the regular patterns formed on the optical sheet such as a light transmission plate to be overlapped on the liquid crystal panels was investigated.
Abstract: PROBLEM TO BE SOLVED: To reduce moire fringes produced when sheets having regular patterns are overlapped. SOLUTION: Relating to a liquid crystal display device, moire fringes are produced by the interference between the regular pattern of pixel lines formed on a liquid crystal panel and the regular pattern of groove lines formed on the optical sheet such as a light transmission plate to be overlapped on the liquid crystal panel, and the pitch P1 of the pixel lines and the pitch P2 of the groove lines are controlled to reduce the period of the moire fringes to the min.
11 citations
TL;DR: A novel method for quantitatively characterizing the moiré effect in autostereoscopic 3D-LED displays is presented using a model applying geometrical ray tracing and a brightness distribution stack, which was experimentally shown to be capable of reducing moirÉ fringes without noticeable increase in crosstalk or significant reduction in visual quality.
Abstract: Large-scale autostereoscopic three-dimensional (3D) light-emitting-diode (LED) displays can provide high-quality, even immersive, visual experiences. However, the unique structural characteristics of the LED display panel can enhance moire effects during parallax generation. We present a novel method for quantitatively characterizing the moire effect in autostereoscopic 3D-LED displays using a model applying geometrical ray tracing and a brightness distribution stack. An optical diffuser (OD) device for moire reduction and performance balance is designed and the influence of several key device parameters on moire pattern features are examined in autostereoscopic 3D-LED displays for the first time. Using the obtained optimal parameters, we assembled an ultra-large moire-less autostereoscopic 3D-LED display prototype, which was experimentally shown to be capable of reducing moire fringes without noticeable increase in crosstalk or significant reduction in visual quality. Finally, the effects on the moire and crosstalk effect of altering key influencing factors were examined.
11 citations