Height from photometric ratio with model-based light source selection

William Smith, Fufu Fang

Research output: Contribution to journalArticle

20 Citations (Scopus)
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Abstract

In this paper, we present a photometric stereo algorithm for estimating surface height. We follow recent work that uses photometric ratios to obtain a linear formulation relating surface gradients and image intensity. Using smoothed finite difference approximations for the surface gradient, we are able to express surface height recovery as a linear least squares problem that is large but sparse. In order to make the method practically useful, we combine it with a model-based approach that excludes observations which deviate from the assumptions made by the image formation model. Despite its simplicity, we show that our algorithm provides surface height estimates of a high quality even for objects with highly non-Lambertian appearance. We evaluate the method on both synthetic images with ground truth and challenging real images that contain strong specular reflections and cast shadows.
Original languageEnglish
Pages (from-to)128-138
Number of pages11
JournalComputer Vision and Image Understanding
Volume134
Early online date12 Dec 2015
DOIs
Publication statusPublished - Apr 2016

Keywords

  • Photometric Stereo
  • Surface integration
  • Non-Lambertian reflectance
  • Albedo estimation

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