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Summary: Effect of decorrelation on 3-D grating detection with static
and dynamic random-dot stereograms
Stephen Palmisano a,*, Robert S. Allison b,c
, Ian P. Howard c
a
Department of Psychology, University of Wollongong, NSW 2522, Australia
b
Department of Computer Science, York University, Ont., Canada M3J 1P3
c
Centre for Vision Research, York University, Toronto, Ont., Canada M3J 1P3
Received 12 July 2004; received in revised form 4 October 2005
Abstract
Three experiments examined the effects of image decorrelation on the stereoscopic detection of sinusoidal depth gratings in static and
dynamic random-dot stereograms (RDS). Detection was found to tolerate greater levels of image decorrelation as: (i) density increased
from 23 to 676 dots/deg2
; (ii) spatial frequency decreased from 0.88 to 0.22 cpd; (iii) amplitude increased above 0.5 arcmin; and (iv) dot
lifetime decreased from 1.6 s (static RDS) to 80 ms (dynamic RDS). In each case, the specific pattern of tolerance to decorrelation could
be explained by its consequences for image sampling, filtering, and the influence of depth noise.
Ó 2005 Elsevier Ltd. All rights reserved.
Keywords: Stereo vision; Correspondence; Stereogram; Surface detection
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