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Combining spectral and photometric stereo techniques for reflectance estimation using an RGB digital camera

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In this work we describe one experiment investigating the combination of a photometric stereo and a multispectral technique to recover spectral information with an RGB digital camera. A 4-source based-photometric device is used to recover the scene normals and the albedo at each image pixel. We use a multispectral technique based on a linear pseudoinverse method, which directly relates spectral reflectances and RGB camera values. The suggested method uses the recovered albedo for each channel as RGB components to recover the spectral reflectance pixel by pixel. It is possible then to avoid finding different reflectances in different points of the surface due to shadows, as the albedo recovered by photometric stereo techniques is not affected by shadows. We expect that analyzing the difficulties and problems encountered will be useful in applications such us color image reproduction, three-dimensional surface analysis and spectral characterization of materials and micro-facets.
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Document Type: Research Article

Publication date: January 1, 2008

More about this publication?
  • Started in 2002 and merged with the Color and Imaging Conference (CIC) in 2014, CGIV covered a wide range of topics related to colour and visual information, including color science, computational color, color in computer graphics, color reproduction, volor vision/psychophysics, color image quality, color image processing, and multispectral color science. Drawing papers from researchers, scientists, and engineers worldwide, DGIV offered attendees a unique experience to share with colleagues in industry and academic, and on national and international standards committees. Held every year in Europe, DGIV papers were more academic in their focus and had high student participation rates.

    Please note: For purposes of its Digital Library content, IS&T defines Open Access as papers that will be downloadable in their entirety for free in perpetuity. Copyright restrictions on papers vary; see individual papers for details.

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