Accession Number : ADA290361

Title :   Spherical Retinal Flow for a Fixating Observer.

Descriptive Note : Technical rept.,

Corporate Author : PENNSYLVANIA UNIV PHILADELPHIA DEPT OF COMPUTER AND INFORMATION SCIENCE

Personal Author(s) : Thomas, Inigo ; Simoncelli, Eero ; Bajcsy, Ruzena

PDF Url : ADA290361

Report Date : FEB 1994

Pagination or Media Count : 24

Abstract : When a human observer moves, the eye continually fixates on targets in the world. Although fixation is a common process in human vision, its role has not yet been established for computational purposes. The main contribution of this paper is the formalize the retinal flow for a fixating observer. A further contribution - a potentially more practical one - is to explore the role of the periphery in predicting collision. Utilizing fixation is expected to turn out be especially fruitful in light of recent advance in computer vision for constructing active head/eye systems. In this work we make the following assumption: (i) the observer moves with respect to the world and fixates on a target; (ii) the world is rigid, with no independently moving elements; and (iii) the possible rotation axes of the eye lie on a plane (comparable to Listing's Plane). Assumption (ii) and (iii) make the problem of determine retinal flow tractable. We first define retinal flow for a 2D universe and then extend it to the full 3D will be decomposed into longitudinal and latitudinal flow; the behavior of longitudinal flow along the retinal periphery will be further analyzed for interesting properties. Finally the results of a simulated experiment on retinal flow at the periphery will be presented.

Descriptors :   *COMPUTER VISION, *VISUAL PERCEPTION, *PSYCHOPHYSICS, MATHEMATICAL MODELS, OBSERVERS, SIMULATION, HUMANS, MOTION, AXES, FLOW, RETINA, VISION, EYE, ROTATION.

Subject Categories : Bionics

Distribution Statement : APPROVED FOR PUBLIC RELEASE