Plane kinematics of moire fringes
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Abstract:
A study of the kinematics of moire fringes produced by moving line gratings relative to each other provides an explanation for optical phenomena appearing during the motion. A method of determination of the instantaneous pole of relative rotation of the gratings is further derived.Keywords:
Moiré pattern
Moiré pattern
Microlens
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Moire security is a type of information hiding technology based on optics.Authentication of packaging by moire patterns was discussed for the anti-counterfeiting technology based on general printing.The generation and principle of moire pattern anti-countfeiting were analysised.We designed the moire pattern with the hiding information by Illustrator and applied it to packaging design.The packaging design was printed by digital proofing to verify it's anti-counterfeiting performance.The result shows that the packaging with the hidden information by the moire anti-counterfeiting technology is revealed after desoding,and a certain authentication effect is obtained. Finally the moire pattern-based production process in printing anti-countfeiting,the detail for moire pattern design and the method for improving the anti-countfetiting performance of moire pattern are put forward.The corresponding solution is also presented.
Moiré pattern
Packaging engineering
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By Howard E. Taylor and Thomas L. Wade London: John Wiley and Sons Ltd. 1963. Pp. vii + 97. Price 15s.
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Moiré pattern
Ribbon
Base (topology)
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Moiré pattern can be readily observed in the case of superimposing two periodic structures. Recently, Moiré pattern, which degrades the quality of an image, become unavoidable in many LED display and three-dimensional displays, which consist of regular structures. Therefore, a model of moiré which fit the character of human vision is important to solve the problem of image quality degradation. In this paper, we modified the the model of Moiré which proposed by Amidror to evaluate the color moiré fringes, which consider the property of human vision system of contrast sensitivity. From the modified model we conclude that moiré minimization could have two lattice form an certain angle. The experimental results show that moiré pattern are vivid when the angle is 0°, 15°, 20° and 45°. However, the spatial frequency of Moiré in 10°, 25°, 30° and 35° are fine in spatial domain. It is also reveal that changing angle is simple and effective in alleviating remarkably Moiré pattern.
Moiré pattern
Spatial frequency
Minification
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Вивченням проблем пам’яті, її процесів, механізмів запам’ятовування, ролі пам’яті для кожної окремої людини і людства загалом займаються дослідники різних галузей науки. Лексична одиниця mémoire є терміном багатьох сфер. У сучасних дослідженнях національ- них мовних картин світу науковій парадигмі знань, що у своїй сукупності створює наукову картину світу, протиставлені наївні знання, які людина отримує, використовує й передає прийдешнім поколінням незалежно від знань наукових. Мета статті полягає у тому, щоб проаналізувати концепт mémoire та продемонструвати процес його вербалізації на матеріалі вільних сполучень із компонентом mémoire, фразеологічних одиниць і паремій, що зафіксували наївні уявлення, асоціації, життєвий досвід, пов’язані з пам’яттю. Дані сполучуваності імені концепту mémoire з прикметниками подають оцінні характеристики пам’яті. Предикативні сполучення представляють пам’ять як сховище для зберігання або як предмет, на якому можна зробити записи. Пам’ять уважають невід’ємним складником здорової людини, втрата пам’яті є відхиленням від норми і фіксується в мові. Погана пам’ять асоцію- ється безпосередньо з дірками або з дірявими предметами. Фразеологічні одиниці, будучи репрезентантами концепту, в образній і експресивній формі представляють уявлення про якість пам’яті людини, пов’язуючи останню з представниками тваринного світу, предметами, що оточують людину в повсякденному житті. Аналіз ознак зазначеного концепту на матеріалі паремій виявляє життєвий досвід про недосконалість пам’яті, але також її важливість для людини; розкриває зв’язок пам’яті з добром і злом, при цьому зазначаючи, що останнє залишає довший слід; пам’яті при- писують здатність рухатися і навіть залишати сліди; відзначено також, що її брак у людини має компенсуватися міцними ногами і що особливу потребу в якісній пам’яті мають брехуни.
Moiré pattern
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We have proposed a non-photorealistic rendering method using the staircasing effect of a bilateral filter for generating moire picture-like images from photographs. This moire pattern is uniquely determined by the nature of the bilateral filter and original images. Therefore, we propose a method for synthesizing another moire pattern that exerts some controls to generate moire picture-like images. We validate the effectiveness of the proposed method by conducting experiments using the image of Lenna and other example images.
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Precision position control techniqes using moire signals have been investigated. First. the calculated results of the moire signals are compared with the experimental results. Good agreements were obtained between these results. Secondly, two position control techniques using moire signals have been investigated under the same experimental conditions. One is a differential moire technique using two grating pairs. The signals obtained by the grating pairs are out of phase 180 each other. In this technique, a differential moire signal between the two moire signals is used as the control signal. In-phase noises in the moire signals are cancelled and the S/N ratio of the signal is improved. Therefore, high positioning accuracy is obtained by this technique. The other is a modified moire technique. In this technique, only one grating pair is used. An inverted moire signal is calculated by a computer from the experimentally obtained moire signal. The positioning accuracies and S/N ratios are compared between these two techniques. The accuracy and the S/N ratio for the differential moire technique were better than those of the modified moire technique. However, the system using later technique is simpler in construction.
Moiré pattern
SIGNAL (programming language)
Position (finance)
Differential phase
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The principle of moire stripe with projection moire method was analyzed in detail, and the formula of moire stripe was deduced. The moire stripes of familiar objects were simulated by computer, and the conclusions are consistent with the results of the famous experiment. The moire stripes of object with the same shape but the different size were compared, and the moire stripes of object with different shape were compared, too. According to the theory picture of projection moire method,the moire stripe of spherical surface was gotten, which is consistent with result of simulation. The moire stripe was filtered and thinned. The clear thinned stripes were obtained after a series of image processing. Then according to the formula of the rank of moire stripe and the height, the 3-D profilometry of the sphere was reconstructed.
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In order to solve the moire caused by the superposition of several plates in the course of screen printing,the forming process of moire was analyzed with mathematics method from the formation mechanism.The moire cycle formula and the general rule of controlling the moire was deduced.The main factors caused the moire in the screen printing were discussed and the countermeasures were put forward.
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