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Titolo:
Fixation could simplify, not complicate, the interpretation of retinal flow
Autore:
Glennerster, A; Hansard, ME; Fitzgibbon, AW;
Indirizzi:
Univ Oxford, Physiol Lab, Oxford OX1 3PT, England Univ Oxford Oxford England OX1 3PT Physiol Lab, Oxford OX1 3PT, England Univ Coll London, Dept Comp Sci, London WC1E 6BT, England Univ Coll London London England WC1E 6BT p Sci, London WC1E 6BT, England Univ Oxford, Dept Engn Sci, Oxford OX1 3PJ, England Univ Oxford Oxford England OX1 3PJ ept Engn Sci, Oxford OX1 3PJ, England
Titolo Testata:
VISION RESEARCH
fascicolo: 6, volume: 41, anno: 2001,
pagine: 815 - 834
SICI:
0042-6989(200103)41:6<815:FCSNCT>2.0.ZU;2-W
Fonte:
ISI
Lingua:
ENG
Soggetto:
EXTRASTRIATE VISUAL-CORTEX; SACCADIC EYE-MOVEMENTS; OPTIC FLOW; SELF-MOTION; HEADING DETECTION; MACAQUE MONKEY; SUPERIOR COLLICULUS; INTRAPARIETAL AREA; COORDINATE SYSTEM; RECEPTIVE-FIELDS;
Keywords:
optic flow; spatial representing; moving observer;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
84
Recensione:
Indirizzi per estratti:
Indirizzo: Glennerster, A Univ Oxford, Physiol Lab, Parks Rd, Oxford OX1 3PT, EnglandUniv Oxford Parks Rd Oxford England OX1 3PT 1 3PT, England
Citazione:
A. Glennerster et al., "Fixation could simplify, not complicate, the interpretation of retinal flow", VISION RES, 41(6), 2001, pp. 815-834

Abstract

The visual system must generate a reference frame to relate retinal imagesin spite of head and eye movements. We show how a reference frame for storing the Visual direction and depth of points can be composed from the angles and changes in angles between pairs and triples of points. The representation has no unique origin in 3-D space nor a unique set of cardinal directions (basis vectors). We show how this relative representation could be built up over a series of fixations and for different directions of translationof the observer. Maintaining gaze on a point as the observer translates helps in building up this representation. In our model, retinal flow is divided into changes in eccentricity and changes in meridional angle. The latter, called 'polar angle disparities' for binocular viewing (Weinshall, 1990. Computer Vision Graphics ann Image Processing, 49 222-241), can be used to recover the relief structure of the scene in a series of stages up to full Euclidean structure. We show how the direction of heading can be recovered by a similar series of stages. (C) 2001 Elsevier Science Ltd. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 25/11/20 alle ore 01:19:01