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Search Results (2)

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Keywords = perceptual quantizer (PQ)

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21 pages, 13069 KiB  
Article
An Adaptive Luminance Mapping Scheme for High Dynamic Range Content Display
by Deju Huang, Xifeng Zheng, Jingxu Li, Junchang Chen, Fengxia Liu, Xinyue Mao, Yufeng Chen and Yu Chen
Electronics 2025, 14(6), 1202; https://doi.org/10.3390/electronics14061202 - 19 Mar 2025
Viewed by 564
Abstract
Ideally, the Perceptual Quantizer (PQ) for High Dynamic Range (HDR) image presentation requires a 12-bit depth to ensure accurate quantization. In most cases, mainstream displays employ a limited 10-bit PQ function for HDR image display, resulting in notable issues such as perceived contrast [...] Read more.
Ideally, the Perceptual Quantizer (PQ) for High Dynamic Range (HDR) image presentation requires a 12-bit depth to ensure accurate quantization. In most cases, mainstream displays employ a limited 10-bit PQ function for HDR image display, resulting in notable issues such as perceived contrast loss and the emergence of pseudo-contours in the image hierarchy, particularly in low-brightness scenes. To address this issue, this paper proposes a novel luminance mapping relationship while preserving a 10-bit depth. Unlike conventional methods that derive PQ using a fixed Just Noticeable Difference (JND) fraction, this approach incorporates an adaptive adjustment factor. By adjusting the JND fraction according to brightness levels, this method effectively optimizes the quantization interval, improves reproducible contrast, and ensures uniform perception. The results demonstrate that the proposed approach effectively reduces the perception of contrast loss in low-brightness scenes, eliminates potential artifacts, and enhances the presentation quality of the display system. Full article
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15 pages, 3997 KiB  
Article
A Fast and Reliable Luma Control Scheme for High-Quality HDR/WCG Video
by Tae-Young Kim and Yong-Goo Kim
Appl. Sci. 2018, 8(10), 1975; https://doi.org/10.3390/app8101975 - 18 Oct 2018
Cited by 1 | Viewed by 3849
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 [...] Read more.
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. Full article
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