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The Assumed Light Direction for Perceiving Shape from Shading James P. O'Shea
 

Summary: The Assumed Light Direction for Perceiving Shape from Shading
James P. O'Shea
Vision Science
University of California, Berkeley
Martin S. Banks
Vision Science
University of California, Berkeley
Maneesh Agrawala
Computer Science
University of California, Berkeley
Figure 1: The shading of an object's surface depends on the light source direction. The light is directed from the viewpoint in the left image,
from 22 deg above the viewpoint in the middle image, and from 44 deg above the viewpoint in the right image. The object is positioned
identically in each of the three views. In this paper, we present an experiment designed to test how shape perception is affected by changing
the angle of the light direction. We found the lighting used in the center image led to the most accurate estimations of 3D shape.
Abstract
Recovering 3D shape from shading is an ill-posed problem that the
visual system can solve only by making use of additional informa-
tion such as the position of the light source. Previous research has
shown that people tend to assume light is above and slightly to the
left of the object [Sun and Perona 1998]. We present a study to in-

  

Source: Agrawala, Maneesh - Department of Electrical Engineering and Computer Sciences, University of California at Berkeley
O'Brien, James F. - Department of Electrical Engineering and Computer Sciences, University of California at Berkeley

 

Collections: Computer Technologies and Information Sciences