Abstract
With the advent of Recommendation ITU-R BT.2020 (Rec. 2020) color space for
ultra-high definition television (UHDTV), the development of a gamut mapping algorithm
for wide to standard gamuts is greatly needed. In wide-gamut UHDTV production,
particularly under the assumption of simultaneous live UHDTV and high-definition
television (HDTV) broadcast scenarios, real-time gamut mapping from UHDTV to HDTV is
vital. Designing such an algorithm requires a careful consideration of the shape and
size of significantly different gamuts. In this paper, we set some requirements for
gamut mapping from UHDTV to HDTV, and propose a hue-preserved gamut mapping algorithm.
The mapping paths are designed in the CIE 1976
${L^{\ast}}{a^{\ast}}{b^{\ast}}$
(CIELAB) color space through modifications of the hue prediction based
on our subjective experimental results on the constant perceived hue. To prevent an
excessive chroma reduction, the lightness of the out-of-gamut colors is changed. The
design process and mathematical expressions of our proposed gamut mapping algorithm are
provided. In addition, we demonstrate the improvements in image quality.
© 2016 IEEE
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