共查询到18条相似文献,搜索用时 100 毫秒
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IPTV视频质量评价技术综述 总被引:1,自引:0,他引:1
IPTV作为数字视频的一个重要业务,其提供的视频质量对于用户来说非常重要。如何对IPTV系统提供的数字视频质量进行评价是近年来研究的热点和难点。本文介绍了视频质量主观评价方法和客观评价方法的研究进展,分析了无参考度量技术,对比各种算法、视频质量评价的标准化状况,总结了IPTV视频质量评价的难点和研究方向。 相似文献
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基于清晰度的数字视频客观质量评价方法研究 总被引:1,自引:0,他引:1
清晰度是视频图像质量的重要指标,对视频主观质量评价结果有直接的影响,定量计算图像清晰度可以作为视频客观质量评价的重要参考指标.本文提出了三种基于图像清晰度的视频客观质量评价算法,比较了它们在性能和复杂度方面的差异.实验结果证明,本文提出的三种基于清晰度的客观质量评价方法算法的准确性比现有评价算法均有一定程度的改善. 相似文献
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近年来,随着计算机视觉处理技术的深入研究和虚拟现实设备的不断普及,沉浸式媒体技术飞速发展并在各个领域得到初步应用。考虑到沉浸式视频产生的质量损耗会影响用户身临其境的沉浸式视觉感受,基于沉浸式视频的质量评价研究成为视频处理领域的研究重点并逐渐引起研究者们的重视。如何量化沉浸式视频的质量损耗并进行质量评价,设计符合人眼视觉感知的算法,用以准确高效地评估视频质量,对于沉浸式视频处理研究领域的发展具有学术研究意义和实际应用价值。本文首先回顾了沉浸式视频主观质量评价数据库和客观质量评价方法的研究,然后介绍了近期涉及沉浸式视频质量评价的主要技术,即深度信息和虚拟视图合成,最后对沉浸式视频质量评价研究工作进行总结和展望。 相似文献
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主要研究对MPEG-2全I帧压缩的高清视频码流客观质量评价的方法,对不同码率的全I帧高清测试序列在压缩域进行压缩特征参数码率和平均量化因子的提取,并对其进行加权,得到客观质量评价值。实验结果表明,设计的视频质量客观评价系统得到的结果与主观评价具有较好的一致性,可用于MPEG-2全I帧压缩的高清视频质量评价。 相似文献
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三网融合下视频业务质量评估体系的研究 总被引:2,自引:0,他引:2
随着三网络融合的推进,由电信运营的IPTV、手机影视等视频业务必将加速发展,对视频业务的质量评估和质量保障将日趋紧迫。本文探讨了基于用户主观体验的的视频质量评估模型和指标体系,并根据IPTV业务的特点,提出了适用的关键指标和指标阈值。视频质量评估模型和指标是构建IPTV等视频业务监测手段的关键,是提升视频质量监测评估不可或缺的重要前提。 相似文献
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Jungdong Seo Xingang Liu Donghyun Kim Kwanghoon Sohn 《Circuits, Systems, and Signal Processing》2012,31(3):1089-1107
Stereoscopic video create the impression of depth by using two slightly different viewpoints. Conventional video quality assessment
methods for 2D video are not suitable for stereoscopic video, so a new video quality assessment model for stereoscopic video
is needed. In this paper, we propose a new objective video quality metric for compressed stereoscopic video. The proposed
algorithm uses blocking artifacts, blurring in edge regions and video quality difference between two views. Blocking artifacts
and blurring in edge regions are distortion appeared in the compressed video, and they are widely used in conventional video
quality model. Difference in video quality between two views considers 3D effect of stereoscopic video. To verify the performance
of the proposed algorithm, we performed subjective evaluation of stereoscopic video, and we confirmed that the proposed algorithm
is superior to the conventional algorithms in respect to correlation with the subjective evaluation. 相似文献
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In current society, artificial intelligence processing technology offers convenient video monitoring, but also raises the risk of privacy leakage. Theoretically, the data used in intelligent video processing methods may directly convey visual information containing private content. For the above problem, this paper uses a multi-layer visual privacy-protected (VPP) coding method to blur private content in the video at the visual level, while avoiding the loss of important visual features contained in the video as much as possible. And this provides a guarantee of the quality of the subsequent keyframe extraction step. Then a visual evaluation algorithm is proposed for assessing the quality of VPP-encoded video privacy protection. And the experiment shows that the results are consistent with those of subjective evaluation. In addition, for VPP-encoded video, we propose an unsupervised two-layer clustering keyframe extraction method with corresponding performance evaluation index. Finally, an association model is established to balance the privacy protection quality and the keyframe extraction performance. 相似文献
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基于MDI的视频质量分析模型,设计并实现了多媒体网络可靠性分析系统。首先,基于RTP/RTCP协议,实现了多媒体网络视频的实时远程传输及播放。然后,将多媒体网络的视频主观评价方法与客观评价方法相结合,提出了一种综合可靠性评价方法,相较于目前的网络可靠性分析方法,综合可靠性评价方法更加全面、可信。最后,通过实验给出了可靠性分析系统的结果。 相似文献
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The rapid increase in the development of digital video systems has generated a strong need for objective video quality metrics. Two methods are presented in this work. One is the Gabor difference analysis (GDA) full reference method, and the other is the reverse frame prediction (RFP) no reference video quality method. Both methods are based on the multi-channel properties of the human visual system (HVS). Gabor filtering is used in both methods. In the GDA method, a reference and a degraded digital video sequence are compared by taking into account various psycho-perceptual properties of the HVS. The RFP method does not require a reference video stream and is intended for in-service testing and on-line monitoring. The performances of the proposed methods are evaluated. The methods in this work are shown to be consistent with the data from subjective testing over a wide range of scenes. This work is critical to the evaluation of the effectiveness of compression schemes on HDTV imagery. 相似文献