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Open AccessArticle

Enhanced Shadow Retargeting with Light-Source Estimation Using Flat Fresnel Lenses

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School of Computing, Edinburgh Napier University, Edinburgh EH10 5DT, UK
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Centre for Vision, Speech and Signal Processing, University of Surrey, Guildford GU2 7XH, UK
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Edinburgh College of Art, University of Edinburgh, Edinburgh EH3 9DF, UK
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Author to whom correspondence should be addressed.
This paper is an extended version of our paper: Casas, L.; Fauconneau, M.; Kosek, M.; Mclister, K.; Mitchell, K. Image Based Proximate Shadow Retargeting. In Proceedings of the Computer Graphics & Visual Computing (CGVC) 2018, Wales, UK, 13–14 September 2018.
Computers 2019, 8(2), 29; https://doi.org/10.3390/computers8020029
Received: 29 January 2019 / Revised: 22 March 2019 / Accepted: 26 March 2019 / Published: 2 April 2019
Shadow-retargeting maps depict the appearance of real shadows to virtual shadows given corresponding deformation of scene geometry, such that appearance is seamlessly maintained. By performing virtual shadow reconstruction from unoccluded real-shadow samples observed in the camera frame, this method efficiently recovers deformed shadow appearance. In this manuscript, we introduce a light-estimation approach that enables light-source detection using flat Fresnel lenses that allow this method to work without a set of pre-established conditions. We extend the adeptness of this approach by handling scenarios with multiple receiver surfaces and a non-grounded occluder with high accuracy. Results are presented on a range of objects, deformations, and illumination conditions in real-time Augmented Reality (AR) on a mobile device. We demonstrate the practical application of the method in generating otherwise laborious in-betweening frames for 3D printed stop-motion animation. View Full-Text
Keywords: augmented reality; mixed reality; computer graphics; interactive graphics; human–computer interaction augmented reality; mixed reality; computer graphics; interactive graphics; human–computer interaction
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Casas Cambra, L.; Fauconneau, M.; Kosek, M.; Mclister, K.; Mitchell, K. Enhanced Shadow Retargeting with Light-Source Estimation Using Flat Fresnel Lenses. Computers 2019, 8, 29.

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