A Unified Approach to Colour2Grey and Image Enhancement Through Gradient Field Integration

Finlayson, Graham D., Montagna, Roberto and Connah, David (2009) A Unified Approach to Colour2Grey and Image Enhancement Through Gradient Field Integration. In: 17th Color Imaging Conference, 2009-01-01.

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The standard approach for the conversion of colour images to greyscale is to remove their chromatic content and keep only the brightness information. However, with this method the detail at equiluminant edges disappears. In this paper, we propose a colour-to-greyscale transformation that preserves details and, at the same time, enhances the output. We consider Socolinsky and Wolff’s technique that codes the contrast information of the three colour channels in a single gradient field. Our contribution is to show how retinex-type algorithms produce a greyscale image by integrating such a gradient. Our approach also addresses the question of integrability where the gradient field is non-integrable (causing the greyscale to have smears and bending artefacts). We show how by diminishing the saturation of the original input we not only reduce the integrability problem but, with enhancement, keep the perceived colour contrast in a greyscale reproduction.

Item Type: Conference or Workshop Item (Paper)
Faculty \ School: 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: Vishal Gautam
Date Deposited: 11 Mar 2011 16:03
Last Modified: 22 Apr 2023 02:43
URI: https://ueaeprints.uea.ac.uk/id/eprint/21859

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