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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 48, Iss. 19 — Jul. 1, 2009
  • pp: 3643–3653

Trichromatic red–green–blue camera used for the recovery of albedo and reflectance of rough-textured surfaces under different illumination conditions

Clara Plata, Juan Luis Nieves, Eva M. Valero, and Javier Romero  »View Author Affiliations


Applied Optics, Vol. 48, Issue 19, pp. 3643-3653 (2009)
http://dx.doi.org/10.1364/AO.48.003643


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Abstract

Photometric-stereo techniques are based on the fact that image intensity depends upon the orientation of the surface with regard to the source of the illumination and its spectral reflectance. They are of special interest when dealing with rough surfaces because they usually present shadowed regions where sudden illumination changes might be found. In the present work we introduce an extension of the four-source photometric-stereo algorithm to color images that is able to recover the surface spectral reflectance of objects captured with a red–green–blue (RGB) camera. This method allows image rendering, even for rough-textured surfaces, under different directions of the impinging illumination. In addition, the introduction of spectral recovery techniques applied to the albedo and spectral reflectance from rough surfaces offers the possibility of image rendering for scenes captured under sources of illumination differing in spectral distribution. Using albedo instead of RGB information helps to avoid any shadows or highlights that might falsify results. One of the advantages of this spectral-based photometric-stereo method is that it can recover not only the albedo values, but also the spectral reflectance spectrum of an object’s surface on a pixel-by-pixel basis, as can be done with more complex hyperspectral imaging devices involving a camera coupled to an extensive set of narrowband filters.

© 2009 Optical Society of America

OCIS Codes
(330.1690) Vision, color, and visual optics : Color
(330.1730) Vision, color, and visual optics : Colorimetry

ToC Category:
Vision, Color, and Visual Optics

History
Original Manuscript: February 18, 2009
Revised Manuscript: May 8, 2009
Manuscript Accepted: June 3, 2009
Published: June 22, 2009

Virtual Issues
Vol. 4, Iss. 9 Virtual Journal for Biomedical Optics

Citation
Clara Plata, Juan Luis Nieves, Eva M. Valero, and Javier Romero, "Trichromatic red-green-blue camera used for the recovery of albedo and reflectance of rough-textured surfaces under different illumination conditions," Appl. Opt. 48, 3643-3653 (2009)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-48-19-3643

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