Perceptual Video Quality Prediction Emphasizing Chroma Distortions
Li-Heng Chen, Christos G. Bampis, Zhi Li, Joel Sole, Alan C. Bovik

TL;DR
This paper investigates perceptual video quality assessment focusing on chroma distortions caused by compression, revealing shortcomings in existing models and proposing a new model that considers chroma fidelity to improve quality prediction.
Contribution
It introduces a new subjective dataset for luma and chroma distortions and develops an objective quality model that accounts for chroma fidelity, advancing the understanding of chroma effects in video quality.
Findings
Existing models poorly predict chroma distortions.
Chroma fidelity significantly impacts perceived video quality.
Potential to reduce bitrate by optimizing chroma compression.
Abstract
Measuring the quality of digital videos viewed by human observers has become a common practice in numerous multimedia applications, such as adaptive video streaming, quality monitoring, and other digital TV applications. Here we explore a significant, yet relatively unexplored problem: measuring perceptual quality on videos arising from both luma and chroma distortions from compression. Toward investigating this problem, it is important to understand the kinds of chroma distortions that arise, how they relate to luma compression distortions, and how they can affect perceived quality. We designed and carried out a subjective experiment to measure subjective video quality on both luma and chroma distortions, introduced both in isolation as well as together. Specifically, the new subjective dataset comprises a total of videos afflicted by distortions caused by varying levels of luma…
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