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Image Based Proximate Shadow Retargeting

Casas, Llogari; Fauconneau, Matthias; Kosek, Maggie; Mclister, Kieran; Mitchell, Kenny

Authors

Matthias Fauconneau

Maggie Kosek

Kieran Mclister



Abstract

We introduce Shadow Retargeting which maps real shadow appearance to virtual shadows given a corresponding deformation of scene geometry, such that appearance is seamlessly maintained. By performing virtual shadow reconstruction from un-occluded real shadow samples observed in the camera frame, we recover the deformed shadow appearance efficiently. Our method uses geometry priors for the shadow casting object and a planar receiver surface. Inspired by image retargeting approaches we describe a novel local search strategy, steered by importance based deformed shadow estimation. 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.

Presentation Conference Type Conference Paper (Published)
Conference Name Computer Graphics & Visual Computing (CGVC) 2018
Start Date Sep 13, 2018
End Date Sep 14, 2018
Acceptance Date Jul 24, 2018
Online Publication Date Sep 13, 2018
Publication Date 2018
Deposit Date Sep 14, 2018
Journal EG UK Computer Graphics & Visual Computing
Publisher Eurographics Association
Peer Reviewed Peer Reviewed
Book Title Proceedings of Computer Graphics & Visual Computing (CGVC) 2018
DOI https://doi.org/10.2312/cgvc.20181206
Keywords CCS Concepts, computing methodologies, mixed / augmented reality, graphics systems and interfaces, perception,
Public URL http://researchrepository.napier.ac.uk/Output/1299435