The concave cusp as a determiner of figure-ground.

@article{Stevens1988TheCC,
  title={The concave cusp as a determiner of figure-ground.},
  author={Kent A. Stevens and Allen Brookes},
  journal={Perception},
  year={1988},
  volume={17 1},
  pages={35-42}
}
The tendency to interpret as figure, relative to background, those regions that are lighter, smaller, and, especially, more convex is well known. Wherever convex opaque objects abut or partially occlude one another in an image, the points of contact between the silhouettes form concave cusps, each indicating the local assignment of figure versus ground across the contour segments. It is proposed that this local geometric feature is a preattentive determiner of figure-ground perception and that… CONTINUE READING

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