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Apparent Greyscale: A Simple and Fast Conversion to Perceptually Accurate Images and Video
Author(s) -
Smith Kaleigh,
Landes PierreEdouard,
Thollot Joëlle,
Myszkowski Karol
Publication year - 2008
Publication title -
computer graphics forum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.578
H-Index - 120
eISSN - 1467-8659
pISSN - 0167-7055
DOI - 10.1111/j.1467-8659.2008.01116.x
Subject(s) - grayscale , artificial intelligence , computer vision , contrast (vision) , computer science , achromatic lens , classification of discontinuities , chromatic scale , lightness , pattern recognition (psychology) , image (mathematics) , mathematics , optics , mathematical analysis , physics , combinatorics
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.