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Volume: 14 | Article ID: art00048
Image
Grey Colour Sharpening
  DOI :  10.2352/CIC.2006.14.1.art00048  Published OnlineJanuary 2006
Abstract

We propose a colour to greyscale algorithmproviding colour separation as well as edge and texture enhancement. An image dependent grey-axis is computed based on the colour distribution in the image. An initial greyscale image is created by a point-wise operation where the grey value is the magnitude of the RGB coordinates re-mapped to the grey axis. The resulting greyscale image is enhanced by applying a novel correction mask. This mask, resembling an unsharp mask, is the sum of the difference between each of the colour components and a blurred version of the greyscale image. The resulting greyscale images are rich in detail without undesirable artifacts.

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Ali Alsam, Øyvind Kolås, "Grey Colour Sharpeningin Proc. IS&T 14th Color and Imaging Conf.,  2006,  pp 263 - 267,  https://doi.org/10.2352/CIC.2006.14.1.art00048

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