Locus filters: Theory and application

Deeb, Rada, Finlayson, Graham D. and Daneshvar, Elaheh (2023) Locus filters: Theory and application. Journal of Imaging Science and Technology, 67 (5). pp. 1-11. ISSN 1062-3701

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Abstract

Recently, a theoretical framework was presented for designing colored filters called Locus Filters. Locus filters are designed so that any Wien-Planckian light, post filtering, is mapped to another Wien-Planckian light. Moreover, it was also shown that only filters designed according to the locus filter framework have this locus-to-locus mapping property. In this paper, we investigate how locus filters work in the real world. We make two main contributions. First, for daylights, we introduce a new daylight locus with respect to which a locus filter always maps a daylight to another daylight (and their correlated color temperature maps in analogy to the Wien-Planckian temperatures). Importantly, we show that our new locus is close to the standard daylight locus (but has a simpler and more elegant formalism). Secondly, we evaluate the extent to which some commercially available light balancing and color correction filters behave like locus filters.

Item Type:	Article
Additional Information:	FUNDING: This research is supported by EPSRC grant EP/S028730/1
Faculty \ School:	Faculty of Science > School of Computing Sciences
UEA Research Groups:	Faculty of Science > Research Groups > Colour and Imaging Lab
Depositing User:	LivePure Connector
Date Deposited:	30 Jun 2025 10:30
Last Modified:	30 Jun 2025 10:30
URI:	https://ueaeprints.uea.ac.uk/id/eprint/99764
DOI:	10.2352/J.ImagingSci.Technol.2023.67.5.050407

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