ICtCp Versus Y'CbCr: Evaluation of ICtCp Color Space and an Adaptive Reshaper for HDR and WCG

Perrin, Anne-Flore; Řeřábek, Martin; Husak, Walt; Ebrahimi, Touradj

doi:10.1109/mce.2017.2714696

Cited by 4 publications

(4 citation statements)

References 6 publications

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“…The main characteristics of ICtCp color space are achromatic I-channel and isoluminance, Hue linearity, perceptually uniform colors and quantization to limited bit-depth. A detailed analysis of ICtCp versus Y'CbCr is presented in [20].…”

Section: I I C O L O R S P a C E S F O R H D Rmentioning

confidence: 99%

“…Some of the other methods try to "reshape" the HDR signal to improve the compression efficiency [20,[34][35][36][37]. Figure 6 shows the architecture.…”

Section: C) Single-layer Non-backward-compatible Codecsmentioning

confidence: 99%

“…Recently, Dolby Laboratories proposed the ICtCp color space addressing the limitations of Y'CbCr [20]. ICtCp extends the IPT color space [21] by exploring a higher dynamic range (up to 10000 cd/m 2 ) and larger color gamuts such as BT.2020 [18].…”

Section: Color Spaces For Hdrmentioning

confidence: 99%

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The technology behind the exceptional visual experience via high dynamic range

Gadgil

Song

et al. 2018

SIP

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High dynamic range (HDR) technology is rapidly changing today's video landscape by offering spectacular visual experiences. The development in display technology to support higher luminance levels for commercial and consumer electronic devices such as TVs, smartphones, projectors etc., has created an exponential demand for delivering HDR content to viewers. The essential component of the HDR technology is “expanded contrast,” which allows richer black levels and enhanced brightness, providing dramatic contrast that reveals finer details. The use of “wide color gamut” allows wider color spectrum and richer colors providing aesthetically pleasing true-to-life feel. Such visual enhancements clearly establish HDR as one of the most significant upcoming video technologies.In this paper, we review major technical advances in this exciting field of study. Quantization of HDR signals is reviewed in the context of transfer functions that convert optical signals to electrical signals and vice versa. They mainly consist of Perceptual Quantization and Hybrid-Log-Gamma approaches. Compression of HDR content is another broad area of study involving several coding approaches, often categorized in terms of backward-compatibility and single/dual layer methods. Some key industry applications of HDR processing systems are also discussed, followed by some future directions of HDR technology.

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Section: I I C O L O R S P a C E S F O R H D Rmentioning

confidence: 99%

“…Some of the other methods try to "reshape" the HDR signal to improve the compression efficiency [20,[34][35][36][37]. Figure 6 shows the architecture.…”

Section: C) Single-layer Non-backward-compatible Codecsmentioning

confidence: 99%

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The technology behind the exceptional visual experience via high dynamic range

Gadgil

Song

et al. 2018

SIP

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“…A comparison between ITP and Y'CbCr color spaces for HDR video compression has been conducted in a recent work of Perrin et al [20]. The two color spaces have been used in an HDR compression scheme where the RGB colors are converted to the mentioned color spaces.…”

Section: Related Workmentioning

confidence: 99%

Effect of color space on high dynamic range video compression performance

Zerman

Hulusić

Valenzise

et al. 2017

2017 Ninth International Conference on Quality of Multimedia Experience (QoMEX)

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Abstract-High dynamic range (HDR) technology allows for capturing and delivering a greater range of luminance levels compared to traditional video using standard dynamic range (SDR). At the same time, it has brought multiple challenges in content distribution, one of them being video compression. While there has been a significant amount of work conducted on this topic, there are some aspects that could still benefit this area. One such aspect is the choice of color space used for coding. In this paper, we evaluate through a subjective study how the performance of HDR video compression is affected by three color spaces: the commonly used Y'CbCr, and the recently introduced ITP (ICtCp) and Ypu'v'. Five video sequences are compressed at four bit rates, selected in a preliminary study, and their quality is assessed using pairwise comparisons. The results of pairwise comparisons are further analyzed and scaled to obtain quality scores. We found no evidence of ITP improving compression performance over Y'CbCr. We also found that Ypu'v' results in a moderately lower performance for some sequences.

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