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3D reconstruction by shadow carving: Theory and practical evaluation

Savarese, Silvio and Andreetto, Marco and Rushmeier, Holly and Bernardini, Fausto and Perona, Pietro (2007) 3D reconstruction by shadow carving: Theory and practical evaluation. International Journal of Computer Vision, 71 (3). pp. 305-336. ISSN 0920-5691.

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Cast shadows are an informative cue to the shape of objects. They are particularly valuable for discovering object's concavities which are not available from other cues such as occluding boundaries. We propose a new method for recovering shape from shadows which we call shadow carving. Given a conservative estimate of the volume occupied by an object, it is possible to identify and carve away regions of this volume that are inconsistent with the observed pattern of shadows. We prove a theorem that guarantees that when these regions are carved away from the shape, the shape still remains conservative. Shadow carving overcomes limitations of previous studies on shape from shadows because it is robust with respect to errors in shadows detection and it allows the reconstruction of objects in the round, rather than just bas-reliefs. We propose a reconstruction system to recover shape from silhouettes and shadow carving. The silhouettes are used to reconstruct the initial conservative estimate of the object's shape and shadow carving is used to carve out the concavities. We have simulated our reconstruction system with a commercial rendering package to explore the design parameters and assess the accuracy of the reconstruction. We have also implemented our reconstruction scheme in a table-top system and present the results of scanning of several objects.

Item Type:Article
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Perona, Pietro0000-0002-7583-5809
Additional Information:© 2006 Springer Science + Business Media. Received May 20, 2005; Revised March 16, 2006; Accepted March 16, 2006. First online version published in June, 2006.
Subject Keywords:shape recovery, shape from shadows, 3D reconstruction, computer vision, shape from silhouettes, shape from contours
Issue or Number:3
Record Number:CaltechAUTHORS:20140730-101717453
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:47600
Deposited By: Caroline Murphy
Deposited On:21 Aug 2014 23:48
Last Modified:31 Oct 2019 23:55

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