Local shape approximation from shading

Daphna Weinshall*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

Shading can be used as an independent cue for exact shape recovery, or it can be used as a supplementary cue for shape interpolation between features whose depths are known from other cues. Exact shape cannot be inferred from a local analysis of shading. However, for shape interpolation a crude local approximation may be sufficient. This paper explores the limits of such local approximations that are easy to compute. In particular, the shape of shading is used to approximate the surface in areas of monotonic change of intensity. This analysis is accompanied by a method for computing the direction of a single-point light source from the shading on occluding contours. A qualitative classification of shape near shading singularities is also discussed.

Original languageAmerican English
Pages (from-to)119-138
Number of pages20
JournalJournal of Mathematical Imaging and Vision
Volume4
Issue number2
DOIs
StatePublished - May 1994

Keywords

  • light-source direction
  • local approximation
  • qualitative shape
  • shape from shading

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