title: Feature-based image segmentation in human vision.
abstract: Experiments are described which indicate that the integration of high-precision shape information along a bright line is blocked by the presence of certain image features. All the features involved have three properties: (1) they are points where contours are not smooth (i.e. not twice differentiable) within the limits set by the finite space constants of visual processes; (2) they are all points that are emphasized in the responses of certain classes of circularly symmetric bandpass spatial filter; and (3) they are all significant for three-dimensional shape analysis. The results are interpreted as implying an inflexible segmentation of the contour image before detailed shape analysis.
authors.affiliation: MRC Applied Psychology Unit, Cambridge, UK.
authors.forename: R J
authors.initials: RJ
authors.lastname: Watt
mesh_terms: D005556:Form Perception / Q000502:physiology*; D006801:Humans; D014785:Vision, Ocular / Q000502:physiology*