Shape from Shading in Different Frames of Reference

It has often been reported that, in the absence of information about the direction of illumination, people interpret surface convexities and concavities in accordance with the assumption that illumination comes from above. However, ‘above’ could mean with reference to gravity, the head or the retina...

Full description

Saved in:
Bibliographic Details
Published in:Perception (London) 1990-01, Vol.19 (4), p.523-530
Main Authors: Howard, Ian P, Bergström, Sten S, Ohmi, Masao
Format: Article
Language:English
Subjects:
Adult
Attention
Computer Graphics
Depth Perception
Discrimination Learning
Humans
Light
Optical Illusions
Orientation
Pattern Recognition, Visual
Psychophysics
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:It has often been reported that, in the absence of information about the direction of illumination, people interpret surface convexities and concavities in accordance with the assumption that illumination comes from above. However, ‘above’ could mean with reference to gravity, the head or the retina. Yonas et al reported that four-year-old infants use the head more than gravity as the frame of reference in interpreting surface relief but that seven-year-olds make about equal use of the two frames of reference. The potency of these two frames of reference when acting separately and when pitted against each other was measured on adult subjects. For all subjects the ‘assumption’ about the direction of illumination was predominantly with respect to the head. The gravitational frame was used only when the headcentric frame was irrevelant, and then not consistently.
ISSN:0301-0066
1468-4233
DOI:10.1068/p190523