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Outdoor shadow modelling and its applications

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posted on 2023-02-03, 03:13 authored by L Gu, Antonio Robles-KellyAntonio Robles-Kelly
This chapter deals with shadow modelling and its utilities in shadow detection and weather estimation in out-door space. Noting the diffuse skylight is scattered by particles in the atmosphere, we view the skylight, which casts the shadow, as a linear combination of scattered sunlight obeying Rayleigh scattering and Mie theory. Thus, we propose a ratio on the shadow-sunlit boundary which only depends on atmospheric condition. This ratio recasts recovering the shadow areas into a clustering setting making use of active contours. It also allows a metric to be formulated that indicates the degree to which a scene is overcast. We illustrate the utility of the method for purposes of detecting shadows and weather estimation in real-world imagery, provide time complexity results and compare against a number of alternatives elsewhere in the literature.

History

Chapter number

3.5

Pagination

473-490

ISBN-13

9789814656535

Edition

5

Language

eng

Publication classification

B1.1 Book chapter

Extent

3.9

Editor/Contributor(s)

Chen CH

Publisher

WORLD SCIENTIFIC

Place of publication

Singapore

Title of book

Handbook Of Pattern Recognition And Computer Vision (5th Edition)

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