Non-mechanical sub-pixel image shifter for acquiring super-resolution digital images

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/28119

Title:	Non-mechanical sub-pixel image shifter for acquiring super-resolution digital images
Authors:	Lan,HC;Wu,ML;Yeatman,EM
Contributors:	光電科學研究所
Keywords:	POLARIZERS;VIEW
Date:	2009
Issue Date:	2010-06-29 19:42:01 (UTC+8)
Publisher:	中央大學
Abstract:	A sub-pixel image shifter is presented, for use in enhancing the spatial resolution of digital image sensors by combining multiple displaced sub-images using a super-resolution (SR) algorithm. The device uses the walk-off phenomenon in birefringent crystals to separate images with opposite polarizations by a sub-pixel displacement. A liquid crystal (LC) waveplate plus a polarizer can then select the specific image to be exposed, with fast, non-mechanical control. This cascaded device, comprising two sapphire crystals, two LCs, and a single polarizer, is capable of 2-dimensional image shift with displacements of 0.5 pixels. The experimental results show that the image registration stability can be precisely controlled within 0.05 pixels and the contrast transfer function ratio of the SR image is enhanced by up to 1.36 times compared to the original captured image. Moreover, based on the fast transition time of LCs, the displaced sub-images can be recorded in video form with a frame rate of 40 fps. (C) 2009 Optical Society of America
Relation:	OPTICS EXPRESS
Appears in Collections:	[Graduate Institute of Optics and Photonics] journal & Dissertation

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