Implication of high dynamic range and wide color gamut content distribution

Lu, Taoran; Pu, Fangjun; Peng, Yin; Chen, Tao; Husak, Walt

doi:10.1117/12.2188572

Cited by 3 publications

(2 citation statements)

References 2 publications

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“…Table 8 shows the HDR-VDP-2 measurements (Average Q values) for 7 test sequences. Each Q value (Anchor and the proposed) represents an average value of 30 frames and all QPs (22,29,32,36) for each sequence. The Q value is a probabilistic indicator that how much the result of the applied method is close to the original HDR image.…”

Section: Resultsmentioning

confidence: 99%

“…Recently, chromatic color artifact problems have been reported during the primary focus on HDR/WCG compression system, and researchers have observed that the chromatic artifacts increase when the bit rate decreases [29]. Thus, Taoran et al [29] studied the phenomenon of color artifact generation in the existing HDR/WCG video coding and IPT-PQ color space. An adaptive reshaping has been proposed to improve both the color performance and texture details before and after the HEVC encoder/decoder using metadata.…”

Section: B Recent Approachesmentioning

confidence: 99%

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Efficient Color Artifact Removal Algorithm Based on High-Efficiency Video Coding (HEVC) for High-Dynamic Range Video Sequences

Lee¹,

Lee

Jun

et al. 2020

IEEE Access

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High efficiency video coding (HEVC) has been developed rapidly to support new generation display devices and their ultra high definition (UHD) with high dynamic range (HDR) and wide color gamut (WCG). To support HDR/WCG sequences on the HEVC standard, pre-/post-processing technique has been designed. After an HDR video is compressed, a reconstructed frame exhibits chromatic distortions that resemble color smearing. To remove this color artifact, we herein propose a block-level quantization parameter (QP) offset-control-based efficient compression algorithm for the HDR sequence. First, we extract the candidate coding units (CUs) with the annoying area to the human eye based on the just noticeable distortion (JND) model. Subsequently, the chromatic distorted blocks are verified by the activity function as the chromatic artifact is observed at the nearby strong edge. For the verified artifact blocks, we reassign the QPs for the Cb and Cr chroma components. Our experimental results show that the proposed method yields an average gain in BD-rate of 3.3% for U, and 3.4% for V with a negligible bitrate increase of 0.3% on average.

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Section: Resultsmentioning

confidence: 99%

Section: B Recent Approachesmentioning

confidence: 99%

Efficient Color Artifact Removal Algorithm Based on High-Efficiency Video Coding (HEVC) for High-Dynamic Range Video Sequences

Lee¹,

Lee

Jun

et al. 2020

IEEE Access

View full text Add to dashboard Cite

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Impact Analysis of Baseband Quantizer on Coding Efficiency for HDR Video

Wong

2016

IEEE Signal Process. Lett.

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Digitally acquired high dynamic range (HDR) video baseband signal can take 10 to 12 bits per color channel. It is economically important to be able to reuse the legacy 8 or 10-bit video codecs to efficiently compress the HDR video. Linear or nonlinear mapping on the intensity can be applied to the baseband signal to reduce the dynamic range before the signal is sent to the codec, and we refer to this range reduction step as a baseband quantization. We show analytically and verify using test sequences that the use of the baseband quantizer lowers the coding efficiency. Experiments show that as the baseband quantizer is strengthened by 1.6 bits, the drop of PSNR at a high bitrate is up to 1.60dB. Our result suggests that in order to achieve high coding efficiency, information reduction of videos in terms of quantization error should be introduced in the video codec instead of on the baseband signal.Comment: Accepted for publication in IEEE Signal Processing Letter

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