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21 April 2005 Computer-generated holograms of 3D images in optical security devices
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Abstract
In this report, an advanced method of calculation of computer-generated holograms (CGHs) for reconstructing 3-D images is proposed. Commonly CGH producing process comprises two parts: synthesis and recording. On the synthesis stage the calculation of the Interferogram Data (IFD) - the array of Bipolar Intensity (BI) values - is carried out. On the recording stage a suitable quantization parameters are chosen and transformation of IFD into the multilevel rectangle data appropriate for Electron-Beam Printing System (EBPS) is accomplished. In proposed method the IFD calculation is implemented in Fresnel approaching with the direct ray tracing. The representation of an object as the Hybrid Elemental Self-Radiating Areas (HESRAs) is used. Such kind of the object representation more accurately corresponds for objects of the scene behavior. Advantages of using non-linear quantization that implies condensing of quantization levels near the BI zero were considered. The influence of random location and direction deviation of elemental hybrid radiating area was explored. In the experimental result, we obtained monochrome computer-generated hologram of 3-D image, suitable for integration into the typical rainbow hologram.
© (2005) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Vladimir I. Girnyk, Sergey A. Kostyukevich, and Eugene V. Braginets "Computer-generated holograms of 3D images in optical security devices", Proc. SPIE 5742, Practical Holography XIX: Materials and Applications, (21 April 2005); https://doi.org/10.1117/12.589126
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