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Titolo:
Information limitations in perception of shape from texture (vol 41, pg 1519, 2001)
Autore:
Li, A; Zaidi, Q;
Indirizzi:
SUNY Coll Optometry, New York, NY 10036 USA SUNY Coll Optometry New York NY USA 10036 tometry, New York, NY 10036 USA
Titolo Testata:
VISION RESEARCH
fascicolo: 22, volume: 41, anno: 2001,
pagine: 2925 -
SICI:
0042-6989(200110)41:22<2925:ILIPOS>2.0.ZU;2-S
Fonte:
ISI
Lingua:
ENG
Soggetto:
SMOOTHLY CURVED SURFACES; SPATIAL-FREQUENCY; IDEAL OBSERVERS; STRIATE-CORTEX; ORIENTATION; REPRESENTATION; PATTERNS; SPACE; CUES;
Keywords:
shape from texture; axis of maximum curvature; orientation modulations; spatial frequency modulations;
Tipo documento:
Correction, Addition
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
33
Recensione:
Indirizzi per estratti:
Indirizzo: Li, A SUNY Coll Optometry, 33 W 42th St, New York, NY 10036 USA SUNY Coll Optometry 33 W 42th St New York NY USA 10036 NY 10036 USA
Citazione:
A. Li e Q. Zaidi, "Information limitations in perception of shape from texture (vol 41, pg 1519, 2001)", VISION RES, 41(22), 2001, pp. 2925

Abstract

Li and Zaidi (Li. A., and Zaidi, Q. (2000) Vision Research, 40, 217-242) showed that the veridical perception of the 3-dimensional (3D) shape of a corrugated surface from texture cues is entirely dependent on the visibility of critical patterns of oriented energy. These patterns are created by perspective projection of surface markings oriented along lines of maximum 3D curvature. In images missing these orientation modulations, observers confused concavities with convexities, and leftward slants with rightward slants. In this paper, it is shown that these results were a direct consequence ofthe physical information conveyed by different oriented components of the texture pattern. For texture patterns consisting of single gratings of arbitrary spatial frequency and orientation. equations are derived from perspective geometry that describe the local spatial frequency and orientation forany slant at any height above and below eye level. The analysis shows thatonly gratings oriented within a few degrees of the axis Of Maximum curvature exhibit distinct patterns of orientation modulations for convex, concave, and leftward and rightward slanted portions of a corrugated surface. All other gratings exhibit patterns of frequency and orientation modulations that are distinct for curvatures on the one hand and slants on the other, butthat are nearly identical for curvatures of different sign, and nearly identical for slants of different direction. The perceived shape of surfaces was measured in a 5AFC paradigm (concave, convex, leftward slant, rightward slant, and flat-frontoparallel). Observers perceived all five shapes correctly only for gratings oriented within a few degrees of the axis of maximum curvature. For all other oriented gratings, observers could distinguish curvatures from slants, but could not distinguish signs of curvature or directions of slant. These results demonstrate that human observers utilize the shape information provided by texture components along both critical and non-critical orientations. (C) 2001 Elsevier Science Ltd. All rights reserved.

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Documento generato il 28/03/20 alle ore 22:38:34