Mechanisms of Stereoscopic Processing: Stereoattention and Surface Perception in Depth Reconstruction
| Autor: | Leonid L. Kontsevich, Christopher W. Tyler |
|---|---|
| Rok vydání: | 1995 |
| Předmět: |
Eye Movements
Surface Properties Property (programming) Computer science Experimental and Cognitive Psychology Stereoscopy 050105 experimental psychology law.invention 03 medical and health sciences 0302 clinical medicine Optics Artificial Intelligence law Humans Attention Visual Pathways 0501 psychology and cognitive sciences Computer vision Spurious relationship Set (psychology) Depth Perception Monocular business.industry 05 social sciences Sensory Systems Ophthalmology Stereopsis Space Perception Stage (hydrology) Artificial intelligence business Depth perception 030217 neurology & neurosurgery |
| Zdroj: | Perception. 24:127-153 |
| ISSN: | 1468-4233 0301-0066 |
| DOI: | 10.1068/p240127 |
| Popis: | Consideration of the range of phenomena from studies of human stereopsis suggests that a five-stage model is required to provide a complete account of the processes involved, within which any stereoattention mechanism must operate. The information from the disparity field of the optical projections to the two eyes (stage 1) goes to a set of parallel Keplerian arrays of disparity detectors, each array selective for a different spatiotemporal property of the visual images (stage 2). Global interactions produce a cyclopean depth image that is cleaned of the spurious ghost images in the Keplerian arrays (stage 3) and that may then be processed for its (hypercyclopean) form elements (stage 4). Finally, there must be a stage of integration of the stereoscopic depth cues with monocular and kinesthetic depth cues to form the overall map of perceived distance (stage 5). The fact that multiple cyclopean surfaces may be perceived as transparent implies that the stereoscopic system is not limited by a singular-surface constraint. However, it is unclear whether multiple surfaces can be seen simultaneously or whether only one surface is seen at a time by a selective-attention process, with the others perceived as a purely inchoate (qualitative) depth impression. New experiments on cueing of ambiguous stereocorrugations by singular flat planes suggest that selective stereoattention is a powerful mechanism. In fact, the results show that attention can be focused not just in horopteral planes but in a variety of depth configurations. Moreover, this attention focus may act as a tracking mechanism to allow perception of smooth cyclopean stereomotion, which has a frequency response up to ~ 5 Hz (in contrast to the ~15 Hz limit for detecting planar disparity shifts as jerky appearance and disappearance effects). Finally, the spatial limits of stereosurface reconstruction are explored with cyclopean targets to show some interesting asymmetries of the surface-wrapping process that may represent object-oriented constraints on depth reconstruction. |
| Databáze: | OpenAIRE |
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