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Titolo:
DISCRIMINATION OF 3-D SHAPE AND 3-D CURVATURE FROM MOTION IN ACTIVE VISION
Autore:
VANDAMME WJM; OOSTERHOFF FH; VANDEGRIND WA;
Indirizzi:
UNIV UTRECHT,DEPT COMPARAT PHYSIOL,PADUALAAN 8 3584 CH UTRECHT NETHERLANDS
Titolo Testata:
Perception & psychophysics
fascicolo: 3, volume: 55, anno: 1994,
pagine: 340 - 349
SICI:
0031-5117(1994)55:3<340:DO3SA3>2.0.ZU;2-E
Fonte:
ISI
Lingua:
ENG
Soggetto:
KINETIC DEPTH; VISUAL-PERCEPTION; SURFACES;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Social Sciences Citation Index
Science Citation Index Expanded
Citazioni:
22
Recensione:
Indirizzi per estratti:
Citazione:
W.J.M. Vandamme et al., "DISCRIMINATION OF 3-D SHAPE AND 3-D CURVATURE FROM MOTION IN ACTIVE VISION", Perception & psychophysics, 55(3), 1994, pp. 340-349

Abstract

We examined the ability of human observers to discriminate between different 3-D quadratic surfaces defined by motion, and with head position fed back to the stimulus to provide an up-to-date dynamical perspective view. We tested whether 3-D shape or 3-D curvature would affect discrimination performance. It appeared that discrimination of 3-D quadratic shape clearly depended on shape but not on the amount of curvature. Even when the amount of curvature was randomized, subjects' performance was not altered. On the other hand, the discrimination of 3-D curvature clearly depended linearly on curvature with Weber fractions of20% on the average and, to a small degree, on 3-D shape. The experiment shows that observers can easily separate 3-D shape and 3-D curvature, and that Koenderink's shape index and curvedness provide a convenient way to specify shape. These results warn us against using just any arbitrary 3-D shape in 3-D shape perception tasks and indicate, for example, that emphasizing 3-D shape in computer displays by exaggeratingcurvature does not have any effect.

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Documento generato il 03/12/20 alle ore 12:53:50