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Spectrum-Locus Convexity: A Metric for Cameras?

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Spectrum-locus convexity confers to human vision the property that optimal colors are 1-0 with at most two transition wavelengths. It also confers illuminant-invariance of the CW/CCW chromaticity ordering of certain reflectance triads. The same holds for cameras, and provides a less stringent criterion for camera quality than that of Maxwell and Ives. Unlike in applications that design reflectance spectra, the camera convexity criterion has the goal of ensuring that cameras and humans share the same non-reversing reflectance triads, not of ensuring illuminant-invariance of the triads themselves. Convexity may be a useful metric, but is undefined when the sensors are non-overlapping. This paper will qualitatively explore these issues.
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Document Type: Research Article

Publication date: January 1, 2013

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  • CIC is the premier annual technical gathering for scientists, technologists, and engineers working in the areas of color science and systems, and their application to color imaging. Participants represent disciplines ranging from psychophysics, optical physics, image processing, color science to graphic arts, systems engineering, and hardware and software development. While a broad mix of professional interests is the hallmark of these conferences, the focus is color. CICs traditionally offer two days of short courses followed by three days of technical sessions that include three keynotes, an evening lecture, a vibrant interactive (poster) papers session, and workshops. An endearing symbol of the meeting is the Cactus Award, given each year to the author(s) of the best interactive paper; there are also Best Paper and Best Student Paper awards.

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