Apparent Greyscale: A Simple and Fast Conversion to Perceptually Accurate Images and Video
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Date
2008
Journal Title
Journal ISSN
Volume Title
Publisher
The Eurographics Association and Blackwell Publishing Ltd
Abstract
This paper presents a quick and simple method for converting complex images and video to perceptually accurate greyscale versions. We use a two-step approach first to globally assign grey values and determine colour ordering, then second, to locally enhance the greyscale to reproduce the original contrast. Our global mapping is image independent and incorporates the Helmholtz-Kohlrausch colour appearance effect for predicting differences between isoluminant colours. Our multiscale local contrast enhancement reintroduces lost discontinuities only in regions that insufficiently represent original chromatic contrast. All operations are restricted so that they preserve the overall image appearance, lightness range and differences, colour ordering, and spatial details, resulting in perceptually accurate achromatic reproductions of the colour original.
Description
@article{10.1111:j.1467-8659.2008.01116.x,
journal = {Computer Graphics Forum},
title = {{Apparent Greyscale: A Simple and Fast Conversion to Perceptually Accurate Images and Video}},
author = {Smith, Kaleigh and Landes, Pierre-Edouard and Thollot, Joelle and Myszkowski, Karol},
year = {2008},
publisher = {The Eurographics Association and Blackwell Publishing Ltd},
ISSN = {1467-8659},
DOI = {10.1111/j.1467-8659.2008.01116.x}
}