University of Illinois Urbana-Champaign

Estimation of shape, lighting, and reflectivity from stereo and shading information

Hougen, Darrell Roy

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https://hdl.handle.net/2142/23310

Description

Title
Estimation of shape, lighting, and reflectivity from stereo and shading information
Author(s)
Hougen, Darrell Roy
Issue Date
1994
Doctoral Committee Chair(s)
Ahuja, Narendra
Department of Study
Computer Science
Discipline
Computer Science
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
  • Engineering, Electronics and Electrical
  • Artificial Intelligence
  • Computer Science
Language
eng
Abstract
This thesis is concerned with the combined use of stereo and shading information for the purpose of three-dimensional surface shape estimation. The applicability, resolution, and accuracy of each individual method is examined and compared with that attainable in a combined approach. Integration is examined from standard and stochastic perspectives. The standard approach involves use of stereo information as an initial estimate of the surface shape from which parameters of the shading method such as the light source direction can be estimated. Issues of lighting and reflectivity estimation are addressed and solutions are advanced. In particular, general methods for estimation of the light source distribution and reflectance map are proposed and tested. Colored lighting and color variant reflectance functions are examined as possible sources of additional shape information. A statistical approach to surface shape estimation called 'shape from appearance' is also advanced. In this approach, stereo information is used indirectly as a source of statistical information. It is shown that through a scale change the resulting statistical model can be used to achieve higher resolution than is achievable through the direct use of stereo information.
Type of Resource
text
Permalink
http://hdl.handle.net/2142/23310
Copyright and License Information
Copyright 1994 Hougen, Darrell Roy

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