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A Ground Truth Data Set for Nikon Camera's Spectral Sensitivity Estimation

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Camera spectral sensitivity functions are obtained either by measurements in the laboratory or via estimation algorithms. A procedure for camera spectral sensitivity measurement is explained in this article, which aims to provide high accuracy ground-truth values with known uncertainty. The measurements were carried out on a Nikon D5100 camera at the National Physical Laboratory, London.

We use the obtained ground truth spectral sensitivity functions to evaluate the performance of some estimation algorithms reported in the literature. We conclude that the estimated sensitivities are not as accurate as the ground truth spectral sensitivities and further improvements are required. We validate previous work, which shows that a known camera basis provides a powerful constraint for estimation.

We have made the ground truth spectral sensitivities measured at NPL along with the detailed uncertainty levels available online for the community to use as a reference data set.
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Document Type: Research Article

Publication date: November 3, 2014

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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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