Informatics and Applications
December 2013, Volume 7, Issue 4, pp 44-51
FUNCTIONS OPTIMIZATION OF LAB-CONTRAST GRADED TRANSFORMATION
- O. P. Arkhipov
- Z. P. Zykova
Abstract
The purpose of this study is to create algorithm for custom conversion of contrast distribution on
stepped-tone scales. The idea is to find suitable Lab-contrast distribution, keeping in mind that scaled distortion of
digital representation of pixels would keep the real perception of color contrast all the same, if only less bright. In
order to approximately calculate the function of Lab-contrast gradual conversion, this study considers two families
of parametric algorithms, the first one uses subset of pixels on the scale as parameters, while the another one uses
many gradations as they are. The problem of selecting the set of optimal parameters is solved by comparison of
range of calculation errors achieved on a set of typical examples by the function of Lab-contrast distribution on
stepped-tone scales. The study shows the function of Lab-contrast distribution on stepped-tone scales that gives
the least error and provides example that proves that with optimal set of parameters chosen, it is not only possible to
avoid visual distortion but the details can also be improved. These findings may be useful in management of maps
of RGB-color images for PC peripherals in order to improve perceptive quality of details.
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[+] About this article
Title
FUNCTIONS OPTIMIZATION OF LAB-CONTRAST GRADED TRANSFORMATION
Journal
Informatics and Applications
December 2013, Volume 7, Issue 4, pp 44-51
Cover Date
2013-12-31
DOI
10.14357/19922264130405
Print ISSN
1992-2264
Publisher
Institute of Informatics Problems, Russian Academy of Sciences
Additional Links
Key words
color reproduction; color perception; Lab-coordinate; contrast; gradation
Authors
O. P. Arkhipov  and Z. P. Zykova
Author Affiliations
Oryol Branch, Institute of Informatics Problems, Russian Academy of Sciences, Oryol, Russia
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