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Perceptual video quality assessment: a survey

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Science China(Information Sciences) 2024年第11期67卷 20-76页

作者： xiongkuo min Huiyu DUAN Wei SUN Yucheng ZHU Guangtao ZHAI Department of Electronic Engineering Shanghai Jiao Tong University

Perceptual video quality assessment plays a vital role in the field of video processing due to the existence of quality degradations introduced in various stages of video signal acquisition, compression,transmission and display. With the advancement of Internet communication and cloud service technology,video content and traffic are growing exponentially, which further emphasizes the requirement for accurate and rapid assessment of video quality. Therefore, numerous subjective and objective video quality assessment studies have been conducted over the past two decades for both generic videos and specific videos such as streaming, user-generated content, 3D, virtual and augmented reality, high dynamic range, high frame rate, audio-visual, etc. This survey provides an up-to-date and comprehensive review of these video quality assessment studies. Specifically, we first review the subjective video quality assessment methodologies and databases, which are necessary for validating the performance of video quality metrics. Second, the objective video quality assessment measures for general purposes are categorized and surveyed according to the methodologies utilized in the quality measures. Third, we overview the objective video quality assessment measures for specific applications and emerging topics. Finally, the performance of the state-of-the-art video quality assessment measures is compared and analyzed. This survey provides a systematic overview of both classical works and recent progress in the realm of video quality assessment, which can help other researchers quickly access the field and conduct relevant research.

关键词： video quality assessment human visual system subjective quality assessment objective quality assessment survey

Perceptual Quality Assessment for Point Clouds:A Survey

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ZTE Communications 2023年第4期21卷 3-16页

作者： ZHOU Yingjie ZHANG Zicheng SUN Wei min xiongkuo ZHAI Guangtao Institute of Image Communication and Network Engineering Shanghai Jiao Tong UniversityShanghai 200240China

A point cloud is considered a promising 3D representation that has achieved wide applications in several ***,quality degradation inevitably occurs during its acquisition and generation,communication and transmission,and rendering and ***,how to accurately perceive the visual quality of point clouds is a meaningful *** this survey,we first introduce the point cloud to emphasize the importance of point cloud quality assessment(PCQA).A review of subjective PCQA is followed,including common point cloud distortions,subjective experimental setups and subjective *** we review and compare objective PCQA methods in terms of modelbased and ***,we provide evaluation criteria for objective PCQA methods and compare the performances of various methods across multiple *** survey provides an overview of classical methods and recent advances in PCQA.

关键词： point cloud quality assessment PCQA databases subjective quality assessment objective quality assessment

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Perceptual Quality Assessment of Omnidirectional Images:Subjective Experiment and Objective Model Evaluation

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ZTE Communications 2019年第1期17卷 38-47页

作者： DUAN Huiyu ZHAI Guangtao min xiongkuo ZHU Yucheng FANG Yi YANG Xiaokang Institute of Image Communication and Network Engineering Shanghai Jiao Tong University

Virtual reality(VR) environment can provide immersive experience to *** the VR environment, providing a good quality of experience is extremely ***, in this paper, we present an image quality assessment(IQA) study on omnidirectional images. We first build an omnidirectional IQA(OIQA) database, including 16 source images with their corresponding 320 distorted images. We add four commonly encountered distortions. These distortions are JPEG compression, JPEG2000 compression, Gaussian blur, and Gaussian noise. Then we conduct a subjective quality evaluation study in the VR environment based on the OIQA database. Considering that visual attention is more important in VR environment, head and eye movement data are also tracked and collected during the quality rating experiments. The 16 raw and their corresponding distorted images,subjective quality assessment scores, and the head-orientation data and eye-gaze data together constitute the OIQA database. Based on the OIQA database, we test some state-of-the-art full-reference IQA(FR-IQA) measures on equirectangular format or cubic formatomnidirectional images. The results show that applying FR-IQA metrics on cubic format omnidirectional images could improve their performance. The performance of some FR-IQA metrics combining the saliency weight of three different types are also tested based on our database. Some new phenomena different from traditional IQA are observed.

关键词： perceptual quality assessment omnidirectional images subjective experiment objective model evaluation visual saliency

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阴道分娩产后出血评估方法的最佳证据总结

军事护理 2024年第7期41卷 15-19页

作者：汪彤周文琳李红刘莹闵雄阔上海交通大学医学院附属国际和平妇幼保健院护理部上海200030 上海交通大学护理学院上海200025 同济大学附属第一妇婴保健院产房上海201204 上海交通大学电子信息与电气工程学院

目的评估和总结国内外阴道分娩产后出血评估方法的相关证据,为临床护理实践提供理论参考。方法基于循证护理学,检索国内外专业协会网站、指南网站及相关数据库中关于阴道分娩产后出血评估方法的相关证据,检索时间为2018年1月至2023年1... 详细信息

目的评估和总结国内外阴道分娩产后出血评估方法的相关证据,为临床护理实践提供理论参考。方法基于循证护理学,检索国内外专业协会网站、指南网站及相关数据库中关于阴道分娩产后出血评估方法的相关证据,检索时间为2018年1月至2023年12月。结果共纳入15篇文献,包括指南6篇、专家共识4篇、证据总结2篇、系统评价1篇、临床决策2篇,归纳出27条证据。结论总结了阴道分娩产后出血评估方法的最佳证据,为提高产后出血量的评估准确率提供参考方法,对预防和管理产后出血具有指导意义。

关键词：产后出血评估量化出血量

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