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Prediction of the Helmholtz-Kohlrausch Effect for Natural Images Using a Correction Function

Yuki HAYAMI, Daiki TAKASU, Hisakazu AOYANAGI, Hiroaki TAKAMATSU, Yoshifumi SHIMODAIRA, Gosuke OHASHI

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Summary :

The human visual system exhibits a characteristic known as the Helmholtz-Kohlrausch (H-K) effect: even if the hue and the lightness retain the same values, the actual lightness (perceived lightness) changes with changes in the color saturation. Quantification of this effect is expected to be useful for the future development and evaluation of high-quality displays. We have been studying the H-K effect in natural images projected by LED projectors, which play important roles in practical uses. To verify the effectiveness of the determinations of the H-K effect for natural images, we have performed a subjective-evaluation experiment by method of adjustment for natural images and compared the experimental values with values calculated from extended form of Nayatani's equation to apply to natural images. In general, we found a high correlation between the two, although there was a low correlation for some images. Therefore, we obtained a correction function derived from the subjective evaluation experiment value of 108 color (hue: 12 × saturation: 3 × lightness: 3) patterns and have applied it to estimate the equation H-K effect.

Publication
IEICE TRANSACTIONS on Fundamentals Vol.E102-A No.9 pp.1217-1224
Publication Date
2019/09/01
Publicized
Online ISSN
1745-1337
DOI
10.1587/transfun.E102.A.1217
Type of Manuscript
Special Section PAPER (Special Section on Image Media Quality)
Category

Authors

Yuki HAYAMI
  Shizuoka University
Daiki TAKASU
  Shizuoka University
Hisakazu AOYANAGI
  NEC Display Solutions, Ltd.
Hiroaki TAKAMATSU
  NEC Display Solutions, Ltd.
Yoshifumi SHIMODAIRA
  Shizuoka University
Gosuke OHASHI
  Shizuoka University

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