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Volume: 26 | Article ID: art00031
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Using a Simple Colour Pre-filter to Make Cameras More Colorimetric
  DOI :  10.2352/ISSN.2169-2629.2018.26.182  Published OnlineNovember 2018
Abstract

The idea of placing a coloured filter in front of a camera to make it more colorimetric has been previously proposed. However, this prior art approach sought to increase the dimensionality of the capture – i.e. to take an image with and without a filter – rather than to change the spectral characteristics of the sensor itself. In this paper, we set out a new method for finding the filter that, in a least-squares sense best achieves the Luther condition. That is, the filter multiplied by the camera spectral sensitivities is 'almost' a linear combination from the colour matching functions of the human visual system. We show that for a given sensor set the best filter and best linear mapping can be found together by solving an alternating least-squares problem. Experiments demonstrate that placing an optimal filter in front of a camera can result in a dramatic improvement in its ability to see the world colorimetrically.

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  Cite this article 

Graham D. Finlayson, Yuteng Zhu, Han Gong, "Using a Simple Colour Pre-filter to Make Cameras More Colorimetricin Proc. IS&T 26th Color and Imaging Conf.,  2018,  pp 182 - 186,  https://doi.org/10.2352/ISSN.2169-2629.2018.26.182

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Copyright © Society for Imaging Science and Technology 2018
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Color and Imaging Conference
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