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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

US10110893B2 Method and device for calculating distortion of a video being affected by compression artifacts and channel artifacts 有权
公开(公告)号：US10110893B2
公开(公告)日：2018-10-23
申请号：US14343047
申请日：2011-09-09
申请人： Xiao Dong Gu , Fan Zhang , Zhibo Chen
发明人： Xiao Dong Gu , Fan Zhang , Zhibo Chen
IPC分类号： H04N19/00 , H04N19/86 , H04N19/154
摘要： In video quality control and estimation, the joint evaluation of compression artifacts and channel artifacts is a problem. The invention considers the joint perception of both a compression artifact level Dm(V) and a channel artifact level Dh(V) in a method for calculating overall distortion in a video being affected by compression artifacts and channel artifacts. The method comprises a step of adding a compression artifact level Dm(V) and a summand S that is derived from log (Dh(V)) multiplied with a factor that decreases with increasing compression artifact level Dm, such as D(V)=Dm(V)+c·(K−Dm(V))·log(Dh(V)). The result obtained is a measure for the overall distortion.

8. 发明授权

US09288453B2 Method and device for lossy encoding data and corresponding device for reconstructing data 有权
标题翻译：用于有损编码数据的方法和装置以及用于重构数据的对应装置
公开(公告)号：US09288453B2
公开(公告)日：2016-03-15
申请号：US14113005
申请日：2011-04-22
申请人： Wenfei Jiang , Zhibo Chen , Fan Zhang
发明人： Wenfei Jiang , Zhibo Chen , Fan Zhang
IPC分类号： G06K9/36 , H04N19/50 , H04N19/147 , H04N19/60 , H04N19/124 , H04N19/132 , H04N19/18 , H04N19/467 , H04N19/86
CPC分类号： H04N19/50 , H04N19/124 , H04N19/132 , H04N19/147 , H04N19/18 , H04N19/467 , H04N19/60 , H04N19/86
摘要： The invention proposes modification of quantized coefficients for signalling of a post-processing method. Therefore, it is proposed a method for lossy compress-encoding data comprising at least one of image data and audio data. Said method comprises determining quantized coefficients using a quantization of a discrete cosine transformed residual of a prediction of said data. Said method further comprises modifying said quantized coefficients for minimizing rate-distortion cost wherein distortion is determined using a post-processed reconstruction of the data, the post-processed reconstruction being post-processed according to a postprocessing method, and compress-encoding said modified coefficients. In said proposed method, the post-processing method is that one of n>1 different predetermined post processing method candidates whose position in an predetermined order of arrangement of the post processing method candidates equals a remainder of division, by n, of a sum of the modified coefficients. Doing so removes the overhead of flags in the bit stream.
摘要翻译：本发明提出了对后处理方法的信令的量化系数的修改。因此，提出了一种包括图像数据和音频数据中的至少一个的有损压缩编码数据的方法。所述方法包括使用所述数据的预测的离散余弦变换残差的量化来确定量化系数。所述方法还包括修改所述量化系数以最小化速率失真成本，其中使用数据的后处理重建来确定失真，后处理重建根据后处理方法进行后处理，并且对所述修改系数进行压缩编码。在所述提出的方法中，后处理方法是以后处理方法候补的预定排列顺序的位置等于n除以n的余数的n≥1个不同的预定后处理方法候选中的一个，修正系数。这样做会消除位流中标志的开销。

9. 发明授权

US09930329B2 Video encoding and decoding based on image refinement 有权
公开(公告)号：US09930329B2
公开(公告)日：2018-03-27
申请号：US14353811
申请日：2011-11-03
申请人： Wenfei Jiang , Fan Zhang , Zhibo Chen
发明人： Wenfei Jiang , Fan Zhang , Zhibo Chen
IPC分类号： H04N19/136 , H04N19/176 , H04N19/147 , H04N19/103 , H04N19/117 , H04N19/132 , H04N19/14 , H04N19/82 , H04N19/124 , H04N19/192 , H04N19/86
CPC分类号： H04N19/86 , H04N19/103 , H04N19/117 , H04N19/124 , H04N19/132 , H04N19/14 , H04N19/147 , H04N19/176 , H04N19/192 , H04N19/82
摘要： A particular implementation forms an initial reconstructed image block from inverse quantization and inverse transform, and further refines the reconstructed image block using pixels from neighboring reconstructed blocks. The image block may be refined using a bilateral filter, whose space parameter and range parameter are adaptive to the quantization parameter. The particular implementation can be used in both encoding and decoding when reconstructing an image block. When used in encoding, the particular implementation can be used jointly with coefficient truncation, where some non-zero transform coefficients are set to zero. The number of remaining non-zero transform coefficients after coefficient truncation may be adaptive to the quantization parameter, the variance of the image block, the number of non-zero transform coefficients of the image block, and the index of the last non-zero transform coefficient in a zigzag scanning order.

10. 发明申请

US20140254676A1 VIDEO ENCODING AND DECODING BASED ON IMAGE REFINEMENT 有权
标题翻译：基于图像精化的视频编码和解码
公开(公告)号：US20140254676A1
公开(公告)日：2014-09-11
申请号：US14353811
申请日：2011-11-03
申请人： Wenfei Jiang , Fan Zhang , Zhibo Chen
发明人： Wenfei Jiang , Fan Zhang , Zhibo Chen
IPC分类号： H04N19/18 , H04N19/117 , H04N19/82 , H04N19/136
CPC分类号： H04N19/86 , H04N19/103 , H04N19/117 , H04N19/124 , H04N19/132 , H04N19/14 , H04N19/147 , H04N19/176 , H04N19/192 , H04N19/82
摘要： A particular implementation forms an initial reconstructed image block from inverse quantization and inverse transform, and further refines the reconstructed image block using pixels from neighboring reconstructed blocks. The image block may be refined using a bilateral filter, whose space parameter and range parameter are adaptive to the quantization parameter. The particular implementation can be used in both encoding and decoding when reconstructing an image block. When used in encoding, the particular implementation can be used jointly with coefficient truncation, where some non-zero transform coefficients are set to zero. The number of remaining non-zero transform coefficients after coefficient truncation may be adaptive to the quantization parameter, the variance of the image block, the number of non-zero transform coefficients of the image block, and the index of the last non-zero transform coefficient in a zigzag scanning order.
摘要翻译：特定的实施方式从反量化和逆变换形成初始重建图像块，并且使用来自相邻重建块的像素进一步精化重构图像块。可以使用双边滤波器对图像块进行精细化，该双边滤波器的空间参数和范围参数适应量化参数。在重构图像块时，特定的实施方式可用于编码和解码两者。当用于编码时，特定的实现可以与系数截断一起使用，其中一些非零变换系数被设置为零。系数截断后剩余的非零变换系数的数量可以适应于量化参数，图像块的方差，图像块的非零变换系数的数量以及最后的非零变换的索引系数为锯齿形扫描顺序。

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