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, a holographic moire technique is developed which allows one to obtain whole field contour maps of the slope fields (derivatives of the out-of-plane displacements) in real time.
Abstract: A holographic moire technique is developed which allows one to obtain whole field contour maps of the slope fields (derivatives of the out-of-plane displacements) in real time. A theoretical analysis of the fringe formation is presented and the factors affecting the fringe visibility are briefly discussed. Experimental demonstration of the method is carried out by studying a centrally loaded square plate clamped along its edges.
11 citations
TL;DR: In this paper, the dependence of nonlinear transfer characteristics on input signals consisting of more than one frequency is evaluated, and common nonlinearities are compared by simulating a moire topography experiment.
Abstract: The intermodulation of signal frequencies, or moire, is an effect generally encountered in situations in which periodic or quasi-periodic structures are superimposed. Most familiar are the striking low-frequency patterns achieved by the multiplicative superposition of two structures. In other situations, the intermodulation of signal frequencies may be caused by nonlinear distortions of an input signal. This can be a desired feature in measuring applications or a noise source in transmission or display. Effects of nonlinear transfer characteristics on input signals consisting of more than one frequency are shown. The dependence of resulting moire frequencies on the nonlinearity is evaluated, and common nonlinearities are compared by simulating a moire topography experiment.
11 citations
Patent•
31 Oct 2005TL;DR: In this article, the creation of moire-based auto-stereoscopic watermarks in rendered images is described, which can be used to embed arbitrary binary patterns into printed documents as digital watermarks.
Abstract: Provided herein are teachings directed to the creation of moire-based auto-stereoscopic watermarks in rendered images. By choosing different halftone structures, which differ by having different spatial frequencies for each of two delineated partitions in an image, it becomes possible to embed arbitrary binary patterns into printed documents as digital watermarks. The invisible watermarks become moire auto-stereoscopic images when the prints are viewed through an overlaid transparency “decoder” suitably prepared by virtue of being rendered with a uniform halftone structure having the correct special frequency in relationship with the partition frequencies employed in the printed document.
11 citations
Patent•
28 Jun 1999TL;DR: In this article, negative feedback was used to reduce the amount of moire patterns in the input image by feeding back an image containing the difference between the original image and the halftone output with possible moire pattern.
Abstract: By using negative feedback, moire patterns can be reduced, or virtually eliminated, from input black-and-white or color original images. In particular, by feeding back an image containing the difference between the original input image and the halftone output with possible moire patterns, and subtracting the low-frequency part of this image from the original input image, a resultant halftone image can be achieved that has reduced moire patterns.
11 citations
TL;DR: In this article, a lens distortion characterization technique based on a color charge coupled device (CCD) moire method was proposed, where high-contrast color moire stripes were formed by superimposing the three sets of reference gratings and the specimen grating under specific conditions.
11 citations