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Separating illuminant and surface reflectance spectra from filtered trichromatic camera measurements

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We show how illuminant and reflectance spectra can be accurately measured or separated, up to a multiplicative factor, at each pixel of a scene by using a CCD digital camera instead of a spectroradiometer. In order to obtain suitable spectra of both illuminants and reflectances in a scene, we may use a 6-channel measure from the digital 3-channel RGB camera. This is accomplished by taking two images of the scene, and using a colour filter during the second. No other practical or theoretical restrictions are needed to apply this separation algorithm, which is based on the validity of low-dimensional linear models for representing illuminant and reflectance spectra.
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Document Type: Research Article

Publication date: January 1, 2006

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  • 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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