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How Vision WorksThe Physiological Mechanisms Behind What We See$
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Nigel Daw

Print publication date: 2012

Print ISBN-13: 9780199751617

Published to Oxford Scholarship Online: May 2012

DOI: 10.1093/acprof:oso/9780199751617.001.0001

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Brightness and Contrast

Brightness and Contrast

Chapter:
(p.34) Chapter 3 Brightness and Contrast
Source:
How Vision Works
Author(s):

Nigel Daw

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780199751617.003.0003

The lightness of an object is determined in relation to the objects around it. The overall illumination of the scene is ignored, and so are shadows falling across the object, and curvature of the object. The lightness is thus calculated by the sharp changes at boundaries, and the slow changes across the object are ignored. The process is started in the retina, where cells respond to contrast with the immediate surround, and continued in visual cortex where influences from a wider area come in. Further influences, such as the effect of perception of transparency, probably come in at higher levels of the system.

Keywords:   lightness, surround, shadows, transparency, curvature, retina, lateral geniculate, visual cortex

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