Abstract
The authors report theoretical and experimental results which
underline the importance of mutual illumination to visual modules
dealing with shape and with surface lightness. The experiments are in
good agreement with results obtained with a simple theoretical model.
These results show the effects of mutual illumination in pictures of
simple objects, and indicate that these effects must be accounted for in
modeling image intensities. The data imply that shape from shading based
on the image irradiance equation make real errors on images of concave
objects, and that edge detectors that respond to only step edges perform
badly on polyhedral scenes and waste information
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