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Shadow modelling based upon Rayleigh scattering and Mie theory

journal contribution
posted on 2014-07-01, 00:00 authored by Lin Gu, Antonio Robles-KellyAntonio Robles-Kelly
In this paper, we present a method to model shadows in outdoor scenes. Here, we note that the shadow areas correspond to the diffuse skylight which arises from the scattering of the sunlight by particles in the atmosphere. This yields a treatment in which shadows in the image can be viewed as a linear combination of scattered light obeying Rayleigh scattering and Mie theory. This allows for the computation of a ratio which permits casting the problem of recovering the shadowed areas in the image into a clustering setting making use of active contours. This also opens-up the formulation of a metric that can be used to assess the degree upon which the scene is overcast. We illustrate the utility of the method for purposes of detecting shadows in real-world imagery, provide time complexity results and compare against a number of alternatives elsewhere in the literature.

History

Journal

Pattern recognition letters

Volume

43

Pagination

89 - 97

Publisher

Elsevier

Location

Amsterdam, The Netherlands

ISSN

0167-8655

Language

eng

Publication classification

C1.1 Refereed article in a scholarly journal

Copyright notice

2013, Elsevier B.V.