A Curious Problem with Using the Colour Checker Dataset for Illuminant Estimation

Finlayson, Graham, Hemrit, Ghalia, Gijsenij, Arjan and Gehler, Peter (2017) A Curious Problem with Using the Colour Checker Dataset for Illuminant Estimation. In: 25th Color and Imaging Conference Final Program and Proceedings. Society for Imaging Science and Technology, NOR, pp. 64-69.

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Abstract

In illuminant estimation, we attempt to estimate the RGB of the light. We then use this estimate on an image to correct for the light's colour bias. Illuminant estimation is an essential component of all camera reproduction pipelines. How well an illuminant estimation algorithm works is determined by how well it predicts the ground truth illuminant colour. Typically, the ground truth is the RGB of a white surface placed in a scene. Over a large set of images an estimation error is calculated and different algorithms are then ranked according to their average estimation performance. Perhaps the most widely used publically available dataset used in illuminant estimation is Gehler's Colour Checker set that was reprocessed by Shi and Funt. This image set comprises 568 images of typical everyday scenes. Curiously, we have found three different ground truths for the Shi-Funt Colour Checker image set. In this paper, we investigate whether adopting one ground truth over another results in different rankings of illuminant estimation algorithms. We find that, depending on the ground truth used, the ranking of different algorithms can change, and sometimes dramatically. Indeed, it is entirely possible that much of the recent 'advances' made in illuminant estimation were achieved because authors have switched to using a ground truth where better estimation performance is possible.

Item Type:	Book Section
Uncontrolled Keywords:	illuminant estimation,colour constancy
Faculty \ School:	Faculty of Science Faculty of Science > School of Computing Sciences
UEA Research Groups:	Faculty of Science > Research Groups > Interactive Graphics and Audio Faculty of Science > Research Groups > Colour and Imaging Lab
Depositing User:	Pure Connector
Date Deposited:	30 Nov 2017 06:08
Last Modified:	20 Apr 2023 01:12
URI:	https://ueaeprints.uea.ac.uk/id/eprint/65642
DOI:	10.2352/ISSN.2169-2629.2017.25.64

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