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Lovell, P. George and Spencer, Lucy J. and Bloj, Marina and Harris, Julie M. (2012) Learning a 3-D Visual Light Field: Effects of Exploration on Lightness Constancy. In: Predicting Perceptions: Proceedings of the 3rd International Conference on Appearance. Lulu Press, Edinburgh UK, pp. 155-157. ISBN 978-1-4716-6869-2

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Abstract

The pattern of light across a scene is determined by the lighting, the material properties of objects in the scene, and the three- dimensional (3-D) scene structure. The problem of determining the material properties of an object is therefore a complex one. To do this correctly the relationship between 3-D scene structure and lighting must be understood by the viewer. In this paper we describe experiments which evaluate how exploration of the lightfield [1] within the scene aids the estimation of surface lightness (albedo). We find that the experience of viewing a block moving throughout the 3D scene - illustrating the variations in lightfield – results in lightness constancy, i.e. viewers are able to estimate surface albedo under varying illumination. Exploration of the lightfield facilitated albedo recovery as opposed to simple brightness matching.

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