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UID:196fda71f6dd00c60d632f3148c7c1e0 CATEGORIES:Human and computer vision series:Spring 2015 CREATED:20151203T141544 SUMMARY:The extent of visual space inferred from perspective angles LOCATION:Universiteit Utrecht\, Helmholtz Institute and Chair\, Department of Physic s and Astronomy DESCRIPTION:
Retinal images are perspective projections of the visual environment. De spite this, it is not selfevident that visual space is a perspective repres entation of physical space. Analysis of underlying spatial transformations shows that visual space is perspective only if physically parallel lines va nish at finite distance in visual space. Perspective angles, i.e. the angle perceived between parallel lines in physical space, were estimated for rai ls of a straight railway track. Perspective angles were also estimated from pictures taken from the same point of view. Perspective angles between rai ls ranged from 27% to 83% of their angular size in the retinal image. Persp ective angles prescribe the distance of vanishing points of visual space. C omputed distances were shorter than six meters. This distance of a hypothet ical space inferred from perspective angles does not match the depth of vis ual space. Incongruity between the perceived shape of a railway line on the one hand and the experienced ratio between width and length of the line on the other hand is huge, but apparently so unobtrusive that it has remained unnoticed. The mismatch casts doubt on the existence of a visual space tha t is consistent for distances and angles.
CONTACT:Dr. Casper Erkelens X-EXTRAINFO:Dr. Casper Erkelens (http://www.uu.nl/staff/CJErkelens/0) DTSTAMP:20240319T085920 DTSTART;TZID=America/New_York:20150209T120000 DTEND;TZID=America/New_York:20150209T190000 SEQUENCE:0 TRANSP:OPAQUE END:VEVENT END:VCALENDAR