Back to articles
Articles
Volume: 17 | Article ID: art00051
Image
A Unified Approach to Colour2grey and Image Enhancement Through Gradient Field Integration
  DOI :  10.2352/CIC.2009.17.1.art00051  Published OnlineJanuary 2009
Abstract

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.

Subject Areas :
Views 4
Downloads 0
 articleview.views 4
 articleview.downloads 0
  Cite this article 

Graham D. Finlayson, Roberto Montagna, David Connah, "A Unified Approach to Colour2grey and Image Enhancement Through Gradient Field Integrationin Proc. IS&T 17th Color and Imaging Conf.,  2009,  pp 278 - 283,  https://doi.org/10.2352/CIC.2009.17.1.art00051

 Copy citation
  Copyright statement 
Copyright © Society for Imaging Science and Technology 2009
72010350
Color and Imaging Conference
color imaging conf
2166-9635
Society of Imaging Science and Technology
7003 Kilworth Lane, Springfield, VA 22151, USA