29 June 2004 Stereographic and animated rainbow diffractive images in optical security
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The basic aspects of animated and stereographic rainbow images making technology are considered in this paper. These images are devoted to include in Optical Security Devices (OSDs) in order to increase its structure complexity and to improve its protective properties. They provide on the one hand the simple identification on the visual level of verification and on the other hand the sufficient reliability against counterfeit. The last one is achieved at first by the division of the elemental unit on the regions of any adjusted shape with outline of the precision that is inaccessible for recreation without Electron Beam Lithography Equipment (EBLE), which is used for OSDs recording, and, secondly, by the used encoding methods. In the context of the paper the theoretical discussion of the diffraction on elemental diffractive grating was carried out. The acquired results have been allowed to create the software utility that models the behaviour of the anigram or stereogram. The analysis of examples of the sythetized by the given methodology anigrams shows that there is peculiar for them the effects of the stereoscopic perception. So the investigations on combined methodology of animated stereographic images synthesis were carried out. There were recorded the stereographic, animated and the animated stereographic images as a parts of demonstrational holograms of STC “Optronics”, Ltd.
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Vladimir I. Girnyk, Vladimir I. Girnyk, Valeriy I. Grygoruk, Valeriy I. Grygoruk, Ilya S. Borisov, Ilya S. Borisov, Sergey Al. Kostyukevych, Sergey Al. Kostyukevych, "Stereographic and animated rainbow diffractive images in optical security", Proc. SPIE 5290, Practical Holography XVIII: Materials and Applications, (29 June 2004); doi: 10.1117/12.525985; https://doi.org/10.1117/12.525985

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