Spatial frequency tuned channels: implications for structure and function from psychophysical and computational studies of stereopsis.
Various psychophysical experiments investigating the role of spatial frequency tuned channels in stereopsis are reviewed and a computational model of stereopsis deriving from these studies is described. The distinctive features of the model are: (1) it identifies edge locations in each monocular field by searching for zero crossings in non-orientated centre-surround convolution profiles; (2) it selects among all possible binocular point-for-point combinations of edge locations only those which satisfy a (quasi-) collinear figural grouping rule; (3) it presents a concept of the orientated and spatial frequency tuned channel as a nonlinear grouping operator. The success of the model is demonstrated both on a stereo pair of a natural scene and on a random-dot stereogram.
D003201:Computers; D003867:Depth Perception / Q000502:physiology*; D005556:Form Perception / Q000502:physiology*; D007839:Functional Laterality; D006801:Humans; D008962:Models, Theoretical; D009949:Orientation; D012160:Retina / Q000502:physiology; D014795:Visual Pathways / Q000502:physiology*