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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Patent•
08 Apr 2004
TL;DR: In this paper, the problem of providing a print having a pattern of letters, symbols, etc., which can not be recognized visually when observed from the front but can be recognized by observing it at a prescribed angle by forming a moire between it and a printed pattern by forming unevenness in the printed pattern.
Abstract: PROBLEM TO BE SOLVED: To provide a print having a pattern of letters, symbols, etc., which can not be recognized visually when observed from the front but can be recognized visually by observing it at a prescribed angle by forming a moire between it and a printed pattern by forming unevenness in the printed pattern. SOLUTION: In the print in which the first pattern constituted of a colored line pattern of the same pitch and the second pattern constituted of pixels having line pattern-like unevenness to share at least a part of the first pattern are formed, the print having a latent image pattern producing a latent image by the second pattern when the first pattern is observed with the print slanted in the direction perpendicular to the line pattern of the first pattern is provided. COPYRIGHT: (C)2004,JPO
2 citations
18 May 1992
TL;DR: The use of computer-generated moire fringes to characterize object shapes is discussed in this paper, where the goal was to determine the feasibility of generating a reference image which, when combined with an image of a perfect test object, would produce straight line fringes, but when combined to an imperfect test object would produce predictable deviations from straight-line fringes.
Abstract: The use of computer-generated moire fringes to characterize object shapes is discussed. The goal was to determine the feasibility of generating a reference image which, when combined with an image of a perfect test object, would produce straight line fringes, but when combined with an imperfect test object, would produce predictable deviations from straight-line fringes. The authors explain the theory behind moire interferometry used in single projection moire; describe the various software programs used to enhance, filter, and combine images; and demonstrates several examples of basic object identification and recognition. Some of the limiting factors of position, scale, and orientation are described. >
2 citations
Patent•
10 Dec 1987
TL;DR: In this paper, a TV image which has no extra moire fringes except contour lines is obtained by making the direction of the straight lines of a reference grating projected on an object parallel to the scanning lines of the device which picks up the image of an object where the grating is projected.
Abstract: PURPOSE:To obtain a TV image which has no extra moire fringes except contour lines by making the direction of straight lines of a reference grating projected on an object parallel to the direction of scanning lines of a device which picks up the image of an object where the reference grating is projected. CONSTITUTION:The image of the reference grating 101 is projected on the object 102 by a light source 103 and then the projection image 106 of the reference grating 101 becomes a grating deformed according to the surface shape of the object 102. The image of the object 102 where the deformed grating is projected on the surface is formed on the image pickup surface 110 of the image pickup device 109 and photographed to generate a video signal. At this time, the direction (X direction) of scanning lines of the image pickup device 109 is coincident with the direction of straight lines of the reference grating 101, so the contour lines are formed on the image of the object 102 as moire fringes formed by the interference between the projection image 106 of the reference grating on the object and the scanning lines of the image pickup device 109.
2 citations
10 Sep 2004
TL;DR: In this article, the authors proposed to extend the Grating Interferometry scheme by Digital Holography, where the grating is directly integrated into the surface, allowing measuring the displacement of that surface under long term conditions within the magnitude of the used wavelength.
Abstract: In this work we propose to extend the Grating Interferometry scheme by Digital Holography. The main advantages of this complementary approach are that no imaging lens is needed and that the reconstruction is not limited to the image plane as it is using a lens. Additionally, this technique provides sensitivity to both directions, normal and parallel to the surface under test. Because the grating is directly integrated into the surface, this allows measuring the displacement of that surface under long term conditions within the magnitude of the used wavelength. Good qualitative results are obtained using a single illumination direction. Quantitative results are obtained using multiple illumination directions and the in-plane sensitivity of the presented technique is shown to be equivalent to that of the Grating Interferometry.
2 citations
TL;DR: In this article, a method for obtaining a high-resolution one-dimensional or two-dimensional moire pattern on a specimen using a holographic film that adheres to the specimen is presented.
Abstract: This paper presents a new method for obtaining a high-resolution one-dimensional or two-dimensional moire pattern on a specimen The technique uses a holographic film that adheres to the specimen The film is twice exposed by a virtual holographic grating, then it is removed from the specimen, devellped, fixed, bleached, and illuminated This process produces clearly visible moire patterns
2 citations