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Summary: ~ Pergamon
0042-6989(94)E0069-W
VisionRes.Vol. 35, No. 1, pp. 139--148,1995
Copyright t~ 1994ElsevierScienceLtd
Printed in Great Britain. All rights reserved
0042-6989/95$7.00+ 0.00
Structure-from-motion: Perceptual Evidence
for Surface Interpolation
STEFAN TREUE,*t RICHARD A. ANDERSEN,*~ HIROSHI ANDO,§ ELLEN C. HILDRETHIII[[
Received 8 April 1993; in revised form 3 March 1994
Dynamic random-dot displays representing a rotating cylinder were used to investigate surface
interpolation in the perception of structure-from-motion (SFM) in humans. Surface interpolation refers
to a process in which a complete surface in depth is reconstructed from the object depth values extracted
at the stimulus features. Surface interpolation will assign depth values even in parts of the object that
contain no features. Such a "fill-in" process should make the detection of featureless stimulus areas
("holes") difficult. Indeed, we demonstrate that such holes in our rotating cylinder can be as wide as
one-quarter of the stimulus before subjects can reliably detect their presence. Subjects were presented
with a variation on the rotating cylinder in which all dots were oscillating either in synchrony or
asynchronously. Subjects perceive a rigidly rotating cylinder even when such a percept is not in agreement
with the physical stimulus. To reconcile this discrepancy between actual and perceived stimulus we
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