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1. 发明申请

US20150304709A1 METHOD AND APPARATUS FOR ESTIMATING VIDEO QUALITY 审中-公开
标题翻译：估计视频质量的方法和装置
公开(公告)号：US20150304709A1
公开(公告)日：2015-10-22
申请号：US14443841
申请日：2012-11-30
申请人： Qian ZHANG , Ning LIAO , Fan ZHANG , Zhibo CHEN
发明人： Qian Zhang , Ning Liao , Fan Zhang , Zhibo Chen
IPC分类号： H04N21/44 , H04N21/61 , H04N21/647 , H04N21/643 , H04N21/442 , H04N21/234
CPC分类号： H04N21/44008 , H04N21/23418 , H04N21/44209 , H04N21/4425 , H04N21/6125 , H04N21/64322 , H04N21/6473 , H04N21/64738 , H04N21/64769
摘要： A method and apparatus are disclosed for predicting subjective quality of a video contained in a bit stream on a packet layer. Header information of the bit-stream is parsed and frame layer information, such as frame type, is estimated. Visible artifact levels are then estimated based on frame layer information. An overall artifact level and quality metric are estimated based on artifact levels for individual frames with other parameters. Specifically, different weighting factors are used for different frame types when estimating the levels of initial visible artifacts and propagated visible artifacts. The number of slices per frame is used as a parameter when estimating the overall artifact level for the video. Moreover, the quality assessment model considers quality loss caused by both coding and channel artifacts.
摘要翻译：公开了一种用于预测分组层中的比特流中包含的视频的主观质量的方法和装置。解析比特流的报头信息，并估计帧类信息，如帧类型。然后基于帧层信息来估计可见的伪像级别。基于具有其他参数的单个帧的伪像级别来估计整体神器级别和质量度量。具体来说，当估计初始可见伪像和传播的可见伪像的水平时，不同的加权因子被用于不同的帧类型。当估计视频的整体神器级别时，每帧的片数被用作参数。此外，质量评估模型考虑了由编码和通道伪影引起的质量损失。

2. 发明申请

US20150373324A1 Method And Apparatus For Context-Based Video Quality Assessment 有权
标题翻译：基于语境视频质量评估的方法与装置
公开(公告)号：US20150373324A1
公开(公告)日：2015-12-24
申请号：US14763940
申请日：2013-06-09
申请人： Ning LIAO , Zhibo CHEN , Fan ZHANG , THOMSON LICENSING
发明人： Ning Liao , Zhibo Chen , Fan Zhang
IPC分类号： H04N17/00 , H04N19/114 , G06T7/00 , G06K9/03 , G06K9/00 , H04N19/103 , H04N19/154
CPC分类号： H04N17/004 , G06K9/00536 , G06K9/00711 , G06K9/036 , G06T7/0002 , G06T2207/10016 , H04N19/103 , H04N19/114 , H04N19/154 , H04N19/48 , H04N19/89
摘要： Spatial distortion (i.e., when a frame is viewed independently of other frames in a video sequence) may be quite different from temporal distortion (i.e., when frames are viewed continuously). To estimate temporal distortion, a sliding window approach is used. Specifically, multiple sliding windows around a current frame are considered. Within each sliding window, a large distortion density is calculated and a sliding window with the highest large distortion density is selected. A distance between the current frame and the closest frame with large distortion in the selected window is calculated. Subsequently, the temporal distortion is estimated as a function of the highest large distortion ratio, the spatial distortion for the current frame, and the distance. In another embodiment, a median of spatial distortion values is calculated for each sliding window and the maximum of median spatial distortion values is used to estimate the temporal distortion.
摘要翻译：空间失真（即，当视频序列中独立于其他帧观看帧）可能与时间失真（即，连续观看帧时）完全不同。为了估计时间失真，使用滑动窗口方法。具体地说，考虑当前帧周围的多个滑动窗口。在每个滑动窗口内，计算出较大的失真密度，并选择具有最大大失真密度的滑动窗口。计算当前帧与所选窗口中具有大失真的最近帧之间的距离。随后，将时间失真估计为最大的大失真比，当前帧的空间失真和距离的函数。在另一个实施例中，为每个滑动窗口计算空间失真值的中值，并且使用中值空间失真值的最大值来估计时间失真。

3. 发明申请

US20140301486A1 VIDEO QUALITY ASSESSMENT CONSIDERING SCENE CUT ARTIFACTS 审中-公开
标题翻译：视频质量评估考虑场景剪裁艺术
公开(公告)号：US20140301486A1
公开(公告)日：2014-10-09
申请号：US14355975
申请日：2011-11-25
申请人： Ning Liao , Zhibo Chen , Fan Zhang , Kai Xie
发明人： Ning Liao , Zhibo Chen , Fan Zhang , Kai Xie
IPC分类号： H04N19/86 , H04N19/89 , H04N19/87
CPC分类号： H04N19/48 , H04N19/154 , H04N19/87 , H04N19/895
摘要： A particular implementation detects scene cut artifacts in a bitstream without reconstructing the video. A scene cut artifact is usually observed in the decoded video (1) when a scene cut picture in the original video is partially received or (2) when a picture refers to a lost scene cut picture in the original video. To detect scene cut artifacts, candidate scene cut pictures are first selected and scene cut artifact detection is then performed on the candidate pictures. When a block is determined to have a scene cut artifact, a lowest quality level is assigned to the block.
摘要翻译：特定的实现检测比特流中的场景切割伪像，而不重建视频。通常在解码视频（1）中观察到原始视频中的场景切换图像被部分接收或（2）当图片参考原始视频中的丢失的场景切换图像时，场景切割伪影。为了检测场景切割伪像，首先选择候选场景切割图像，然后对候选图像执行场景切割伪影检测。当确定块具有场景切割伪影时，将最低质量级别分配给块。

4. 发明申请

US20140286441A1 VIDEO QUALITY MEASUREMENT 审中-公开
标题翻译：视频质量测量
公开(公告)号：US20140286441A1
公开(公告)日：2014-09-25
申请号：US14353351
申请日：2011-11-24
申请人： Fan Zhang , Ning Liao , Kai Xie , Zhibo Chen
发明人： Fan Zhang , Ning Liao , Kai Xie , Zhibo Chen
IPC分类号： H04N19/89
CPC分类号： H04N19/00933 , H04N17/004 , H04N19/895
摘要： A particular implementation receives a bitstream and derives parameters from the bitstream. The parameters include quantization parameters, content unpredictability parameters, ratios of lost blocks, ratios of propagated blocks, error concealment distances, motion vectors, durations of freezing, and frame rates. Using these parameters, a compression distortion factor, a slicing distortion factor, and a freezing distortion factor are estimated respectively for distortions resulting from video compression, a slicing mode error concealment, and a freezing slicing mode error concealment. The distortion factors are then mapped to a composite video quality score. For applications with limited computational power, the estimation of distortion factors can be simplified. In particular, the compression distortion factor, the slicing distortion factor, and the freezing distortion factor can be predicted from quantization parameters, ratios of lost blocks, and durations of freezing, respectively.
摘要翻译：特定实现接收比特流并从比特流导出参数。参数包括量化参数，内容不可预测性参数，丢失块的比率，传播块的比率，错误隐藏距离，运动向量，冻结持续时间和帧速率。分别使用这些参数来估计压缩失真因子，切片失真因子和冻结失真因子，用于由视频压缩，切片模式错误隐藏和冷冻切片模式错误隐藏产生的失真。然后将失真因子映射到复合视频质量得分。对于具有有限计算能力的应用，可以简化失真因子的估计。具体地，压缩失真因子，切片失真因子和冻结失真因子可以分别从量化参数，丢失块的比率和冻结时间预测。

5. 发明授权

US10075710B2 Video quality measurement 有权
公开(公告)号：US10075710B2
公开(公告)日：2018-09-11
申请号：US14353351
申请日：2011-11-24
申请人： Fan Zhang , Ning Liao , Kai Xie , Zhibo Chen
发明人： Fan Zhang , Ning Liao , Kai Xie , Zhibo Chen
IPC分类号： H04N19/89 , H04N17/00 , H04N19/895
CPC分类号： H04N19/176 , H04N17/004 , H04N19/895
摘要： A particular implementation receives a bitstream and derives parameters from the bitstream. The parameters include quantization parameters, content unpredictability parameters, ratios of lost blocks, ratios of propagated blocks, error concealment distances, motion vectors, durations of freezing, and frame rates. Using these parameters, a compression distortion factor, a slicing distortion factor, and a freezing distortion factor are estimated respectively for distortions resulting from video compression, a slicing mode error concealment, and a freezing slicing mode error concealment. The distortion factors are then mapped to a composite video quality score. For applications with limited computational power, the estimation of distortion factors can be simplified. In particular, the compression distortion factor, the slicing distortion factor, and the freezing distortion factor can be predicted from quantization parameters, ratios of lost blocks, and durations of freezing, respectively.

6. 发明授权

US09961340B2 Method and apparatus for video quality measurement 有权
公开(公告)号：US09961340B2
公开(公告)日：2018-05-01
申请号：US14364144
申请日：2011-12-15
申请人： Fan Zhang , Ning Liao , Kai Xie , Zhibo Chen
发明人： Fan Zhang , Ning Liao , Kai Xie , Zhibo Chen
IPC分类号： H04N7/12 , H04N17/00 , H04N19/176 , H04N19/124 , H04N19/154
CPC分类号： H04N17/004 , H04N19/124 , H04N19/154 , H04N19/176
摘要： Accuracy and efficiency of video quality measurement are major problems to be solved. According to the invention, a method for accurately predicting video quality uses a rational function of the quantization parameter QP, which is corrected by a correction function that depends on content unpredictability CU. Exemplarily, the correction function is a power function of the CU. Both QP and CU can be computed from the video elementary stream, without full decoding the video. This ensures high efficiency.

7. 发明授权

US09288071B2 Method and apparatus for assessing quality of video stream 有权
标题翻译：用于评估视频流质量的方法和装置
公开(公告)号：US09288071B2
公开(公告)日：2016-03-15
申请号：US13695058
申请日：2010-04-30
申请人： Ning Liao , Zhibo Chen , Xianlei Wang
发明人： Ning Liao , Zhibo Chen , Xianlei Wang
IPC分类号： H04L12/725 , H04L12/24 , H04N17/00 , H04N21/435 , H04N21/6437 , H04L29/06 , H04N19/46 , H04N19/196 , H04N19/61 , H04N19/154 , H04N19/86 , H04N19/895
CPC分类号： H04L12/24 , H04L41/00 , H04L65/4076 , H04L65/80 , H04N17/004 , H04N19/154 , H04N19/196 , H04N19/46 , H04N19/61 , H04N19/86 , H04N19/895 , H04N21/435 , H04N21/6437
摘要： Objective video quality assessment models at media-layer or at packet-layer are known for estimating audio/video quality of experience. Existing models are not able to provide stable performance. A method for enabling quality assessment of a stream of frames of video data comprises receiving a sequence of packets, generating a set of parameters and inserting said generated set of parameters as side information into said stream of frames, wherein at least one parameter refers to a video slice level. A method for assessing the quality of a stream of frames of video data comprises receiving a sequence of packets, extracting a set of parameters from said sequence of packets and generating an estimated mean opinion score, wherein the video data comprise a slice level and wherein the extracted set of parameters comprises at least one parameter that refers to a video slice level.
摘要翻译：用于估计音频/视频体验质量的媒体层或分组层的目标视频质量评估模型是已知的。现有型号不能提供稳定的性能。一种用于实现视频数据帧流的质量评估的方法包括接收分组序列，产生一组参数，并将所述生成的参数集合作为辅助信息插入所述帧流中，其中至少一个参数是指视频切片级别。一种用于评估视频数据帧流的质量的方法包括接收分组序列，从所述分组序列中提取一组参数并生成估计的平均意见分数，其中所述视频数据包括切片级别，其中，提取的参数集合包括参考视频片段级别的至少一个参数。

8. 发明申请

US20150215619A1 METHOD AND APPARATUS FOR DETECTING GRADUAL TRANSITION PICTURE IN VIDEO BITSTREAM 有权
标题翻译：用于检测视频比特中梯度过渡图像的方法和装置
公开(公告)号：US20150215619A1
公开(公告)日：2015-07-30
申请号：US14423325
申请日：2012-12-29
申请人： Ning Liao , Zhibo Chen , Kai Xie
发明人： Ning Liao , Zhibo Chen , Kai Xie
IPC分类号： H04N19/109 , H04N19/176 , H04N19/182 , H04N19/154 , H04N19/142 , H04N19/184
CPC分类号： H04N19/109 , H04N5/147 , H04N17/004 , H04N19/11 , H04N19/142 , H04N19/154 , H04N19/176 , H04N19/182 , H04N19/184 , H04N19/48
摘要： The invention provides a method and apparatus for detecting a gradual transition picture in a bitstream. The method comprises: accessing a bitstream including encoded pictures; and determining a gradual transition picture in the bitstream using information from the bitstream without decoding the bitstream to derive pixel information.
摘要翻译：本发明提供一种用于检测比特流中的逐渐转换图像的方法和装置。该方法包括：访问包括编码图像的比特流; 以及使用来自所述比特流的信息确定所述比特流中的逐渐转换图像，而不解码所述比特流以导出像素信息。

9. 发明授权

US09769501B2 Video quality assessment at a bitstream level 有权
公开(公告)号：US09769501B2
公开(公告)日：2017-09-19
申请号：US14405079
申请日：2012-07-17
申请人： Ning Liao , Zhibo Chen , Kai Xie
发明人： Ning Liao , Zhibo Chen , Kai Xie
IPC分类号： H04N19/895 , H04N19/44 , H04N19/184 , H04N19/139 , H04N19/177 , H04N17/00 , H04N19/86 , H04N19/89 , H04N19/154
CPC分类号： H04N19/895 , H04N17/004 , H04N19/139 , H04N19/154 , H04N19/177 , H04N19/184 , H04N19/44 , H04N19/86 , H04N19/89
摘要： A macroblock in a video sequence may be undecodable because the corresponding compressed data is lost or the syntax is out of synchronization. An undecodable macroblock may be concealed using error concealment technique. The level of initial visible artifacts caused by undecodable macroblocks may be estimated as a function of motion magnitude, error concealment distance, and/or residual energy. The initial visible artifacts may propagate spatially or temporally to other macroblocks through prediction. Considering both initial visible artifacts and propagated artifacts, levels of overall artifacts may be estimated for individual macroblocks. The visual quality for the video sequence can then be estimated by pooling the macroblock level artifact levels.

10. 发明申请

US20140119460A1 METHOD AND DEVICE FOR ASSESSING PACKET DEFECT CAUSED DEGRADATION IN PACKET CODED VIDEO 审中-公开
标题翻译：用于评估分组编码视频中的分组缺陷导致的降解的方法和装置
公开(公告)号：US20140119460A1
公开(公告)日：2014-05-01
申请号：US14128623
申请日：2011-06-24
申请人： Xiao Dong Gu , Ning Liao , Zhibo Chen
发明人： Xiao Dong Gu , Ning Liao , Zhibo Chen
IPC分类号： H04N19/89
CPC分类号： H04N19/89 , H04N19/154
摘要： Because of the encoding, decoding, and/or transmitting characteristic, the blocks affected by packet defect usually gather in a small spatial/temporal area. The viewers perception of each affected block will influence by other affected block in this small area. The invention proposes using processing means for clustering blocks affected by the packet loss into at least one cluster, for using at least one of spatial and temporal characteristics of the at least one cluster for determining a visibility value of the at least one cluster, for classifying the at least one cluster as belonging into one of at least two different class candidates, wherein each class candidate is associated with a different weight; for weighting the determined visibility value with the weight associated with the class of the at least one cluster, and for assessing the degradation of the video using a sum of the weighted visibility value.
摘要翻译：由于编码，解码和/或发送特性，受分组缺陷影响的块通常聚集在小的空间/时间区域中。每个受影响区块的观众感知将受到其他受影响区块的影响。本发明提出使用处理装置，用于将受分组丢失影响的块聚集到至少一个簇中，以便使用至少一个簇的空间和时间特征中的至少一个来确定至少一个簇的可见性值，以便分类所述至少一个集群属于至少两个不同类候选中的一个，其中每个类候选者与不同的权重相关联; 用于利用与所述至少一个集群的类别相关联的权重对所确定的可见性值进行加权，并且使用加权的可见性值的和来评估视频的劣化。

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