An Application of the Photometric Stereo Method.

Abstract

The orientation of patches on the surface of an object can be determined from multiple images taken with different illumination, but from the same viewing position. This method, referred to as photometric stereo, can be implemented using table lookup based on numerical inversion of experimentally determined reflectance maps. Here we concentrate on objects with specularly reflecting surfaces, since these are of importance in industrial applications. Previous methods, intended for diffusely reflecting surfaces, employed point source illumination, which is quite unsuitable in this case. Instead, we use a distributed light source obtained by uneven illumination of a diffusely reflecting planar surface. Experimental results are shown to verify analytic expressions obtained for a method employing three light source distributions. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Aug 01, 1979
Accession Number
ADA078125

Entities

People

  • Berthold K. P. Horn
  • Katsushi Ikeuchi

Organizations

  • Massachusetts Institute of Technology

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Brightness
  • Calibration
  • Cameras
  • Classification
  • Computer Stereo Vision
  • Coordinate Systems
  • Diameters
  • Geometric Forms
  • Geometry
  • Light Sources
  • Materials
  • Measurement
  • Reflectance
  • Simulations
  • Surface Properties
  • Three Dimensional
  • Two Dimensional

Readers

  • Computational Modeling and Simulation
  • Computer Vision.
  • Spectroscopy.