检测沉浸式视听内容感知过程中脑电图谱的存在感变化

Vytautas Abromavičius, Aurimas Gedminas, A. Serackis
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引用次数: 2

摘要

多媒体的体验质量(QoE)进行了充分的研究,以评估最终用户主观感知的内容的总体可接受性。QoE通常通过自我评价的主观量表来量化。然而,随着信号采集、信号处理技术的不断改进和计算效率的提高,可以利用生理信号来评估用户的QoE。本研究通过对生理信号(EEG)的分析,探讨通过存在感(SoP)评价QoE的可能性。为了获得客观QoE评价的更多信息,研究了不同SoP下的视听刺激数据集,重点研究了所收集的主观评价与测量的生理信号之间的关系。统计分析表明,脑电图频谱特征与主观评价问卷结果存在一定的相关性。在研究过程中,我们发现所有研究区域的波段功率都发生了显著变化。此外,α带活动在额叶、中央叶和枕叶不同水平的SoP下显示出变化。β低频段活动在顶叶和颞叶表现出显著变化,β中频段活动在额叶表现出显著差异,β高频段活动在颞叶表现出显著差异。结果表明,脑电信号可作为沉浸式视听交流中SoP变化的客观表征之一。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Detecting sense of presence changes in EEG spectrum during perception of immersive audiovisual content
Quality of Experience (QoE) in multimedia is amply investigated in order to assess the overall acceptability of the content as perceived subjectively by the end user. QoE is usually quantified by self-evaluated subjective scales. However, continuous improvement of signal acquisition, signal processing technologies and increase of computational efficiency enabled the use of physiological signals to evaluate users QoE. In this study the analysis of physiological signals (electroencephalography — EEG) was investigated in order to explore a possibility to evaluate the QoE through the Sense of Presence (SoP). In order to obtain more information about objective QoE evaluation, a dataset of audiovisual stimuli under different SoP was investigated focusing on a relationship between collected subjective assessments and measured physiological signals. Statistical analysis suggests that there exists a relationship between spectral features of EEG and subjective assessment questionnaire results. During investigation, presented in this paper a significant changes in the theta band power was found in all investigated regions. In addition, alpha band activity was shown to change under different levels of the SoP of the frontal, central and occipital lobes. Beta low band activity showed significant changes in the parietal and temporal lobes, beta middle oscillations showed significant differences in the frontal lobe, beta high in temporal lobe. Results revealed that EEG signals can be used as one of the features objectively measuring change of SoP in the immersive audiovisual communications.
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