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When an object approaches an observer, there are a number of cues to its motion, which can be divided into monocular and binocular classes. Monocularly, image size increases as a function of time. It has been shown that for a small, rapidly moving object, such cues are relatively weak, compared with binocular cues, with which this work is concerned. Binocular information about motion in depth, or 'stereomotion', can be further sub-divided into two seperate cues which coincide in natural examples of MID. As an object approaches, i) its binocular disparity changes and ii) the images on each retinatranslate in opposite directions. Theoretically, stereomotion perception could involve one or both of these cues, which will be referred to as the changing disparity cue and the inter-ocular velocity difference (IOVD) cue respectively. This talk presents evidence from 4 psychophysical
investigations into the processing of stereomotion speed, concluding
that both cues are used, though their relative potency depends
critically on the range of |
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NASA | NASA Ames Research Center | IHH Vision Group | IHH Spatial Display Group | Human Factors Research and Technology Division (IH) | Information Sciences and Technology Directorate (I) |