Perceiving motion and rigid structure from optic flow: a combined weak-perspective and polar-perspective approach.
Structure-from-motion algorithms based on weak-perspective projection have many interesting properties and could serve as a basis for a model of human perception of motion and structure from motion (M&SFM). There is some psychophysical evidence, however, that points to discrepancies between what can be accomplished with these algorithms and the performance of human subjects in certain M&SFM tasks. In light of this evidence, this paper presents a mechanism that both takes advantage of all the possibilities offered by a weak-perspective approach and behaves in a manner that is in close correspondence with human performance in M&SFM tasks. It consists of a novel weak-perspective-based method operating at small visual angles and a complementary, perspective-projection-based method operating at larger visual angles.
Lind
M
M
Department of Psychology, Uppsala University, Sweden. mats.lind@nomos.se
D000465:Algorithms; D001288:Attention; D003867:Depth Perception; D004193:Discrimination Learning; D006801:Humans; D009039:Motion Perception; D009949:Orientation; D010364:Pattern Recognition, Visual; D011601:Psychophysics