Abstract
This paper presents a new method for sequentially estimating object color, light source color, and direction by using a cuboid. The method is based on the dichromatic reflection model. First, it is pointed out that three surfaces of a cuboid illuminated by parallel rays give pure diffuse reflection (DR) to a camera directed to the surfaces. The second point is that normal DR radiance (NDR) corresponding to normally incident rays can be derived from radiance of the surfaces. The NDR gives object color and light source direction. Light source color is estimated as the difference between object color and observed color. © 2005 Wiley Periodicals, Inc. Syst Comp Jpn, 36(12): 1–10, 2005; Published online in Wiley InterScience (). DOI 10.1002sscj.20399
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