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Computational approach for depth from defocus

Ghita, Ovidiu and Whelan, Paul F. and Mallon, John (2005) Computational approach for depth from defocus. Journal of Electronic Imaging, 14 (2). ISSN 1017-9909

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Abstract

Active depth from defocus (DFD) eliminates the main limitation faced by passive DFD, namely its inability to recover depth when dealing with scenes defined by weakly textured (or textureless) objects. This is achieved by projecting a dense illumination pattern onto the scene and depth can be recovered by measuring the local blurring of the projected pattern. Since the illumination pattern forces a strong dominant texture on imaged surfaces, the level of blurring is determined by applying a local operator (tuned on the frequency derived from the illumination pattern) as opposed to the case of window-based passive DFD where a large range of band pass operators are required. The choice of the local operator is a key issue in achieving precise and dense depth estimation. Consequently, in this paper we introduce a new focus operator and we propose refinements to compensate for the problems associated with a suboptimal local operator and a nonoptimized illumination pattern. The developed range sensor has been tested on real images and the results demonstrate that the performance of our range sensor compares well with those achieved by other implementations, where precise and computationally expensive optimization techniques are employed.

Item Type:Article (Published)
Refereed:Yes
Uncontrolled Keywords:depth from defocus (DFD);
Subjects:Computer Science > Image processing
DCU Faculties and Centres:DCU Faculties and Schools > Faculty of Engineering and Computing > School of Electronic Engineering
Research Initiatives and Centres > Research Institute for Networks and Communications Engineering (RINCE)
Publisher:IS&T--The Society for Imaging Science & Technology and SPIE--The International Society for Optical Engineering
Official URL:http://dx.doi.org/10.1117/1.1900743
Copyright Information:Copyright 2005 Society of Photo-Optical Instrumentation Engineers and The Society for Imaging Science and Technology. One print or electronic copy may be made for personal use only. Systematic electronic or print reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.
ID Code:2454
Deposited On:09 Mar 2009 14:34 by DORAS Administrator. Last Modified 09 Mar 2009 14:34

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