Abstract
The evolution of display technologies makes high dynamic range/wide color gamut (HDR/WCG) media of great interest in various applications including cinema, TV, blue-ray titles, and others. However, the HDR/WCG media format for consumer electronics requires the sampling rate conversion of chroma signals, resulting in a quality problem on the luminance perception of media, even without compression. In order to reduce such luminance perception problems, this paper proposes a fast and reliable luma control scheme which takes advantage of the bounds on the best luma value derived from the solution based on truncated Taylor series. Simulations performed for an extensive comparison study demonstrate that the proposed algorithm significantly outperforms the previous representative fast luma control schemes, resulting in almost the same quality of the iterative optimal solution with a fixed amount of computations per processing unit.
Highlights
High dynamic range and wide color gamut (HDR/WCG) video has recently received much attention due to its significant impact on the improvement of video quality by using a much higher contrast range, wider color primaries, and higher bit depth than conventional standard dynamic range (SDR) video
In order to facilitate the usage of such HDR/WCG video, standardization efforts have been made, including the production format of HDR-TV [1], the HDR electro-optical transfer function (EOTF) [2], the common media format for consumer electronics [3], and so on
In dealing with such HDR/WCG video, chroma subsampling, which is a key component for a video preprocessing system, introduces a severe quality problem on subjective luminance perception
Summary
Received: 19 September 2018; Accepted: 15 October 2018; Published: 18 October 2018. Featured Application: The proposed scheme is highly useful for high quality HDR imaging applications including cameras and post-production systems using HDR-10 media profile.
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