公开(公告)号：EP2945383B1

公开(公告)日：2018-07-18

申请号：EP15167533.7

申请日：2015-05-13

申请人： BlackBerry Limited

发明人： He, Dake ,  Wang, Xiaofeng ,  Wang, Jing ,  Ji, Tianying ,  Flynn, David

IPC分类号： H04N19/13 ,  H04N19/157 ,  H04N19/174 ,  H04N19/172 ,  H03M7/40

CPC分类号： H04N19/91 ,  H04N19/124 ,  H04N19/13 ,  H04N19/157 ,  H04N19/172 ,  H04N19/174

摘要： Methods of encoding and decoding video are described. The encoder and decoder include a buffer storing at least two context model states, each being the context model state after context-adaptive encoding/decoding of a respective previously-encoded/decoded picture. One of the at least two stored context model states is selected from the buffer and used to initialize the context model for context-adaptively decoding a current picture. The current picture is then context-adaptively entropy encoding/decoded.

公开(公告)号：EP2816805A1

公开(公告)日：2014-12-24

申请号：EP13169785.6

申请日：2013-05-29

申请人： BlackBerry Limited

发明人： He, Dake ,  Nguyen, Nguyen ,  Martin-Cocher, Gaëlle Christine ,  Flynn, David

IPC分类号： H04N19/00 ,  H04N19/503 ,  H04N19/61

CPC分类号： H04N19/105 ,  H04N19/147 ,  H04N19/36 ,  H04N19/50 ,  H04N19/61

摘要： Methods of encoding and decoding media, for example video, using conditional reconstruction refinement are described. The encoding and decoding relies upon predictions that are based on previously encoded and decoded samples. Prediction information identifies the previously reconstructed samples upon which a prediction is to be based and is available to both the encoder and decoder. On the basis that a previously-reconstructed sample is going to be used as source data for a prediction, the encoder refines that reconstructed sample, uses the refined reconstructed sample for the prediction, and encodes refinement data to enable the decoder to also refine the previously-reconstructed sample during decoding. In some cases, a reconstructed sample may be refined more than once. Various flags or bits may be used to signal when refinement is enabled or disabled and may be signaled at various hierarchical points in the coding structure.

摘要翻译： 描述使用条件重建细化来对介质（例如视频）进行编码和解码的方法。 编码和解码依赖于基于先前编码和解码的样本的预测。 预测信息识别先前重建的样本，预测将基于该样本，并且对编码器和解码器均可用。 在先前重构的样本将被用作预测的源数据的基础上，编码器精化重建样本，使用精确的重构样本进行预测，并且对细化数据进行编码，以使解码器能够先前改进 - 解码过程中重构样本。 在某些情况下，重建样本可能会被多次精炼。 可以使用各种标志或位来在细化被启用或禁用时发出信号，并且可以在编码结构中的各个分层点发出信号。

公开(公告)号：EP2753078A1

公开(公告)日：2014-07-09

申请号：EP13150555.4

申请日：2013-01-08

申请人： BlackBerry Limited

发明人： Flynn, David ,  He, Dake

IPC分类号： H04N7/24

CPC分类号： H04N19/00569 ,  H04N19/117 ,  H04N19/176 ,  H04N19/186 ,  H04N19/44 ,  H04N19/46 ,  H04N19/50 ,  H04N19/503 ,  H04N19/593 ,  H04N19/82

摘要： Methods of encoding and decoding video, in particular chroma components, using filtered predictions, are described. An intra or inter predicted block is first filtered before being used to determine residual data at the encoder or to reconstruct chroma data at the decoder. The filtering tends to be low-pass filtering, which removes high-frequency components from the prediction block. The encoder signals the use of the filter to the decoder by including a filtered-prediction flag for each coding unit, or other region within a picture, that has been subject to prediction filtering. The syntax may provide that only coding units above a threshold size have an associated filtered-prediction flag; smaller coding units are governed by a filtered-prediction flag sent in connection with a higher node in the coding tree block.

摘要翻译： 描述了使用滤波预测对视频，特别是色度分量进行编码和解码的方法。 在用于确定编码器处的残差数据或在解码器处重构色度数据之前，首先对帧内或帧内预测块进行滤波。 滤波往往是低通滤波，从预测块中去除高频分量。 编码器通过对已经进行预测过滤的每个编码单元或图像内的其他区域包括滤波预测标志，向滤波器通知滤波器的使用。 语法可以规定，仅高于阈值大小的编码单元具有相关联的滤波预测标志; 较小的编码单元由与编码树块中的较高节点相关联地发送的滤波预测标志来管理。

公开(公告)号：EP2843949A1

公开(公告)日：2015-03-04

申请号：EP13174435.1

申请日：2013-06-28

申请人： BlackBerry Limited

发明人： Nguyen, Nguyen ,  He, Dake ,  Flynn, David

IPC分类号： H04N19/00

CPC分类号： H04N19/186 ,  H04N19/124 ,  H04N19/176 ,  H04N19/46

摘要： Methods of encoding and decoding video in a low-fidelity mode are described. A coding unit level low-fidelity flag is present in the bitstream to signal whether low-fidelity mode is enabled for a particular coding unit or not. If enabled, then, for that coding unit, the chroma quantization parameter is determined using the luma quantization parameter adjusted by a low-fidelity-mode offset. If not enabled, then, for that coding unit, the chroma quantization parameter is determined using the luma quantization parameter without adjustment by the low-fidelity-mode offset. The chroma quantization parameter is then used in the scaling of quantized chroma transform domain coefficients. Use with luma or other video components is also proposed.

摘要翻译： 描述以低保真模式对视频进行编码和解码的方法。 比特流中存在编码单元级低保真标志，以指示是否为特定编码单元启用低保真模式。 如果启用，则对于该编码单元，使用由低保真度模式偏移调整的亮度量化参数来确定色度量化参数。 如果没有使能，则对于该编码单元，使用亮度量化参数来确定色度量化参数，而不通过低保真度模式偏移进行调整。 色度量化参数然后用于量化色度变换域系数的缩放。 还提出使用亮度或其他视频组件。

公开(公告)号：EP2945383A1

公开(公告)日：2015-11-18

申请号：EP15167533.7

申请日：2015-05-13

申请人： BlackBerry Limited

发明人： He, Dake ,  Wang, Xiaofeng ,  Wang, Jing ,  Ji, Tianying ,  Flynn, David

IPC分类号： H04N19/13 ,  H04N19/157 ,  H04N19/174 ,  H04N19/172 ,  H03M7/40

CPC分类号： H04N19/91 ,  H04N19/124 ,  H04N19/13 ,  H04N19/157 ,  H04N19/172 ,  H04N19/174

摘要： Methods of encoding and decoding video are described. The encoder and decoder include a buffer storing at least two context model states, each being the context model state after context-adaptive encoding/decoding of a respective previously-encoded/decoded picture. One of the at least two stored context model states is selected from the buffer and used to initialize the context model for context-adaptively decoding a current picture. The current picture is then context-adaptively entropy encoding/decoded.

摘要翻译： 描述了编码和解码视频的方法。 编码器和解码器包括存储至少两个上下文模型状态的缓冲器，每个上下文模型状态都是在相应的先前编码/解码图片的上下文自适应编码/解码之后的上下文模型状态。 从缓冲器中选择至少两个存储的上下文模型状态中的一个，并将其用于初始化用于上下文自适应地解码当前图片的上下文模型。 然后对当前图片进行上下文自适应熵编码/解码。