周边情境影响下的移动视频感知研究

Jingteng Xue, Chang Wen Chen
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引用次数: 24

摘要

当代用户几乎可以随时随地通过移动设备观看视频内容。这些移动用户的一个共同体验是,当观看环境变化(例如从室内到室外)时,视觉感知存在显著差异。ITU-T建议书中定义的传统视频质量评估(VQA)概述了一组需要严格遵守的评估条件。这些条件,包括观看距离,房间照明,显示亮度和背景色度,历史上被调整为模拟客厅电视观看场景。在本文中,我们首先提出了一组独特的移动视频上下文因素,这些因素与传统的客厅评估条件有很大不同。我们设计并执行了一系列主观测试,以评估在移动视频中经常遇到的这些上下文因素的影响。评价结果表明:(1)感知质量与语境因素高度相关;(2)在情境视觉干扰存在的情况下,观看者发现的视频信号失真较小,对移动视频质量的期望值较低。然后,我们提出了一个基于可注意失真(JND)理论的VQA模型,并证明了该模型能够提供感知移动视频质量的上下文感知预测。最后,讨论了该VQA模型在视频传输系统设计中的应用。
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A study on perception of mobile video with surrounding contextual influences
Contemporary users have been viewing video contents via mobile devices from virtually anywhere and at any time. One common experience these mobile users feel is the significant difference in visual perception when viewing context changes, e.g. from indoor to outdoor. Conventional video quality assessment (VQA) defined under ITU-T recommendations outlines a set of evaluation conditions that need to be strictly followed. These conditions, including viewing distance, room illumination, display brightness and chromaticity of background are historically tuned to simulate the living room television viewing scenario. In this paper, we first present a set of contextual factors that are unique for mobile video and are substantially different from conventional living room evaluation conditions. We design and perform a series of subjective tests to evaluate the influence of these contextual factors that frequently encountered in the case of mobile video. These evaluation results show that (1) perceptual quality is highly correlated with the con-text factors; (2) with the presence of the contextual visual interference, the viewers shall spot less video signal distortion and have lower expectations on the quality of mobile video. We then pro-pose a VQA model based on the Just Noticeable Distortion (JND) theory and we prove that this model is able to provide context aware prediction of perceived mobile video quality. Finally, we also discuss its application of this VQA model in the design of video transmission systems.
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