Shape from shading in different frames of reference.

Abstract:

: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 irrelevant, and then not consistently.

journal_name

Perception

journal_title

Perception

authors

Howard IP,Bergström SS,Ohmi M

doi

10.1068/p190523

subject

Has Abstract

pub_date

1990-01-01 00:00:00

pages

523-30

issue

4

eissn

0301-0066

issn

1468-4233

journal_volume

19

pub_type

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