Slant-tilt: The visual encoding of surface orientation

  title={Slant-tilt: The visual encoding of surface orientation},
  author={Kent A. Stevens},
  journal={Biological Cybernetics},
A specific form for the internal representation of local surface orientation is proposed, which is similar to Gibson's (1950) “amount and direction of slant”. Slant amount is usually quantifed by the angle σ between the surface normal and the line of sight (0°≦σ≦90°). Slant direction corresponds to the direction of the gradient of distance from the viewer to the surface, and may be defined by the image direction τ to which the surface normal would project (0°≦τ≦360°). Since the direction of… CONTINUE READING