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Volume: 11 | Article ID: art00007
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Spectral Measurement of Omnidirectional Light Distribution and Its Application to Image Rendering
  DOI :  10.2352/CIC.2003.11.1.art00007  Published OnlineJanuary 2003
Abstract

This paper proposes a method for estimating a set of spectral-power distributions of an omnidirectional light distribution from images taken by a camera aimed at a mirrored ball. First, we introduce some measuring systems that are designed for acquiring ambient light at any location in natural scenes. Second, a mapping algorithm is determined between coordinates on the ball and light rays in the world. Then we create images representing the omnidirectional light distribution. Third, the illuminant spectral-power distribution is recovered using the RGB image data and the calibrated reflectance data of the ball. Fourth, a CG image is created using the estimated omnidirectional illuminant distribution and a spectral-reflectance model for various objects. An experiment is conducted in our university gym.

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Shoji Tominaga, Norihiro Tanaka, "Spectral Measurement of Omnidirectional Light Distribution and Its Application to Image Renderingin Proc. IS&T 11th Color and Imaging Conf.,  2003,  pp 30 - 35,  https://doi.org/10.2352/CIC.2003.11.1.art00007

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