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Titolo:
A note about preferred orientations at the first and second stages of complex (second-order) texture channels
Autore:
Graham, N; Wolfson, SS;
Indirizzi:
Columbia Univ, Dept Psychol, New York, NY 10027 USA Columbia Univ New York NY USA 10027 Dept Psychol, New York, NY 10027 USA
Titolo Testata:
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION
fascicolo: 9, volume: 18, anno: 2001,
pagine: 2273 - 2281
SICI:
1084-7529(200109)18:9<2273:ANAPOA>2.0.ZU;2-4
Fonte:
ISI
Lingua:
ENG
Soggetto:
SPATIAL-FREQUENCY-SELECTIVITY; SIMPLE FOURIER; NONLINEAR PROCESSES; REGION SEGREGATION; CONTRAST; VISION; MECHANISMS; DISCRIMINATION; FACILITATION; BOUNDARIES;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
43
Recensione:
Indirizzi per estratti:
Indirizzo: Graham, N Columbia Univ, Dept Psychol, New York, NY 10027 USA Columbia Univ New York NY USA 10027 hol, New York, NY 10027 USA
Citazione:
N. Graham e S.S. Wolfson, "A note about preferred orientations at the first and second stages of complex (second-order) texture channels", J OPT SOC A, 18(9), 2001, pp. 2273-2281

Abstract

Complex (second-order) channels have been useful in explaining many of thephenomena of perceived texture segregation. These channels contain two stages of linear filtering with an intermediate pointwise nonlinearity. One unanswered question about these hypothetical channels is that of the relationship between the preferred orientations of the two stages of filtering. Is a particular orientation at the second stage equally likely to occur with all orientations at the first stage, or is there a bias in the "mapping" between the two stages' preferred orientations? In this study we consider two possible mappings: that where the orientations at the two stages are identical (called "consistent" here) and that where the orientations at the two stages are perpendicular ("inconsistent"). We explore these mappings using atexture-segregation task with textures composed of arrangements of grating-patch elements. The results imply that, to explain perceived texture segregation, complex channels with a consistent orientation mapping must be either somewhat more prevalent or more effective than those with an inconsistent mapping. (C) 2001 Optical Society of America.

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Documento generato il 06/04/20 alle ore 05:44:12