A page from the OpenDepot.org service

Jump to the start of the main contents

Schofield, Andrew J. and Rock, Paul B. and Georgeson, Mark A. (2012) Sun and Sky? Probing the Default Illuminant for Human Shape-from-Shading. In: Predicting Perceptions: Proceedings of the 3rd International Conference on Appearance. Lulu Press, Edinburgh UK, pp. 172-176. ISBN 978-1-4716-6869-2

[img]
Preview
PDF (Sun and Sky? Probing the Default Illuminant for Human Shape-from-Shading) - Published Version
Available under License Creative Commons Attribution Non-commercial No Derivatives.

Download (1137Kb) | Preview

    Abstract

    People perceive smooth luminance variations as being due to the shading produced by surface undulations: shape-from-shading. To do this the visual system must simultaneously estimate the nature of the illumination and the shape of the surface. Shape-from- shading operates even when both these properties are unknown and neither can be estimated directly from the image. In such circumstances humans are thought to adopt a default illumination model. It is widely held that the default illuminant is a point source located above the observer’s head, but some have argued that the default illuminant is a diffuse source. We present evidence that humans adopt an illumination model that includes both diffuse and directional (overhead) elements.

    Item Type: Book Section
    Uncontrolled Keywords: Shading, illumination, lighting-from-above, dark-is-deep.
    Subjects: UNSPECIFIED
    Divisions: UNSPECIFIED
    Depositing User: Dr Stefano Padilla
    Date Deposited: 07 May 2012 14:14
    Last Modified: 08 May 2012 12:37
    URI: http://opendepot.org/id/eprint/1091

    Actions (login required)

    View Item