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ICOP & ICPET 2018, 24 - : 69-72 Back to browse issues page
Spectral scanning foveated imaging
Farhang Javaherian * 1, Bizhan Rashidian 1
1- Sharif University of Technology, Department of Electrical Enginering
Abstract:   (59 Views)

In foveated imaging method, geometrical aberrations are corrected in just one point of view called fovea. The fovea can be dynamically changed by changing the phase of a liquid crystal spatial light modulator (LC-SLM). These devices suffer from technological problems that limit their range of change capability. This limitation, renders the foveated imaging systems that use such devices, single wavelength and thus having a low illumination. In this paper, a technique named Spectral Scanning (SS) is proposed. In the SS method, aberration compensation is performed sequentially for each of three colors that span a wide band. Based on the sharpening effect, the combined image shows a rather good resolvability in the whole band. Foveated imager implemented by this technique can be used to image multi-chromatically and pan-chromatically large field angles with an acceptably little loss in the contrast as compared with traditional single wavelength systems. In fact, the design example showcased in this paper is shown to extend field of view up to 10 times of that of the original lens and illumination gain is about 15-fold as compared with the single wavelength foveated imager.

Keywords: foveated imaging, wide angle lens design, sharpening effect, liquid crystal spatial light modulator, aberration compensation
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Type of Study: Research | Subject: Special
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Javaherian F, Rashidian B. Spectral scanning foveated imaging. ICOP & ICPET. 2018; 24 :69-72
URL: http://opsi.ir/article-1-1587-en.html

Volume 24 - Back to browse issues page
انجمن اپتیک و فوتونیک ایران Optics and Photonics Society of Iran
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