公开(公告)号：WO2020190853A1

公开(公告)日：2020-09-24

申请号：PCT/US2020/022945

申请日：2020-03-16

Applicant: VID SCALE, INC.

Inventor： LUO, Jiancong ,  HE, Yuwen ,  CHEN, Wei

IPC: H04N19/517 ,  H04N19/523

Abstract: Systems and methods are described for video coding. In some embodiments, inter prediction of a sample in a current block is performed by rounding an initial motion vector and determining a rounding error vector caused by the rounding. An unrefined prediction of the sample is generated using the rounded motion vector. Unrefined predictions are similarly generated for other samples in the current block. Based on the unrefined predictions, a spatial gradient is determined for each sample position in the block. A refined prediction is generated for each sample position by adding, to the unrefined prediction, a scalar product between the spatial gradient and the rounding error vector at the sample position. Example methods can reduce the number of reference pixels used to predict a current block and thus may reduce memory access bandwidth.

公开(公告)号：WO2020185925A1

公开(公告)日：2020-09-17

申请号：PCT/US2020/022139

申请日：2020-03-11

Applicant: VID SCALE, INC.

Inventor： YANG, Hua ,  HE, Yuwen

IPC: H04N19/46 ,  H04N19/513 ,  H04N19/577

Abstract: Systems, devices, and methods are described herein for symmetric merge mode motion vector coding. Symmetric bi-prediction (bi-pred) motion vectors (MVs) may be constructed from available candidates in a merge candidate list for regular inter prediction merge mode and/or affine prediction merge mode. Available MV merge candidates may be symmetrically extended or mapped in either direction (e.g., between reference pictures before and after a current picture), for example, when coding a picture that allows bi-directional motion compensation prediction (MCP). A symmetric bi-pred merge candidate may be selected among merge candidates for predicting the motion information of a current prediction unit (PU). The symmetric mapping construction may be repeated by a decoder (e.g., based on a coded index of the MV merge candidate list), for example, to obtain the same merge candidates and coded MV at an encoder.

公开(公告)号：WO2020069076A1

公开(公告)日：2020-04-02

申请号：PCT/US2019/053088

申请日：2019-09-26

Applicant: VID SCALE, INC.

Inventor： HE, Yuwen ,  LUO, Jiancong ,  XIU, Xiaoyu ,  YE, Yan

IPC: H04N19/137 ,  H04N19/159

Abstract: Systems, methods, and instrumentalities may be provided for determining whether to bypass bi-directional optical flow (BDOF) if BDOF is used in combination with bi-prediction with coding unit (CU) weights ( e.g ., generalized bi-prediction (GBi)). A coding system may combine coding modes, coding techniques, and/or coding tools. The coding system may include a wireless transmit/receive unit (WTRU). For example, the coding system may combine BDOF and bi-prediction with GU weights (BCW). BDOF may include refining a motion vector associated with a current CU based at least in part on gradients associated with a location in the current CU. The coding system may determine that BDOF is enabled, and/or that bi-prediction with CU weights is enabled for the current CU. The coding system's determination that bi-prediction with CU weights is enabled and/or that BDOF is enabled may be based on one or more indications.

公开(公告)号：WO2020047132A1

公开(公告)日：2020-03-05

申请号：PCT/US2019/048615

申请日：2019-08-28

Applicant: VID SCALE, INC.

Inventor： HE, Yuwen ,  XIU, Xiaoyu ,  YE, Yan ,  LUO, Jiancong

IPC: H04N19/109 ,  H04N19/13 ,  H04N19/134 ,  H04N19/147 ,  H04N19/176 ,  H04N19/184 ,  H04N19/52 ,  H04N19/523 ,  H04N19/54

Abstract: Systems and methods are described for video coding using affine motion models with adaptive precision. In an example, a block of video is encoded in a bitstream using an affine motion model, where the affine motion model is characterized by at least two motion vectors. A precision is selected for each of the motion vectors, and the selected precisions are signaled in the bitstream. In some embodiments, the precisions are signaled by including in the bitstream information that identifies one of a plurality of elements in a selected predetermined precision set. The identified element indicates the precision of each of the motion vectors that characterize the affine motion model. In some embodiments, the precision set to be used is signaled expressly in the bitstream; in other embodiments, the precision set may be inferred, e.g., from the block size, block shape or temporal layer.

公开(公告)号：WO2019148117A1

公开(公告)日：2019-08-01

申请号：PCT/US2019/015449

申请日：2019-01-28

Applicant: VID SCALE, INC.

Inventor： XIU, Xiaoyu ,  HE, Yuwen ,  YE, Yan

IPC: H04N19/57 ,  H04N19/56

Abstract: Systems and methods are described for selecting a motion vector (MV) to use in frame-rate up conversion (FRUC) coding of a block of video. In one embodiment, a first set of motion vector candidates is identified for FRUC prediction of the block. A search center is defined based on the first set of motion vector candidates, and a search window is determined, the search window having a selected width and being centered on the search center. A search for a selected MV is performed within the search window. In some embodiments, an initial set of MVs is processed with a clustering algorithm to generate a smaller number of MVs that are used as the first set. The selected MV may be subject to a motion refinement search, which may also be performed over a constrained search range. In additional embodiments, search iterations are constrained to limit complexity.

公开(公告)号：WO2019032765A8

公开(公告)日：2019-02-14

申请号：PCT/US2018/045900

申请日：2018-08-09

Applicant: VID SCALE, INC.

Inventor： XIU, Xiaoyu ,  HE, Yuwen ,  YE, Yan ,  ZHANG, Yan

IPC: H04N19/56 ,  H04N19/139 ,  H04N19/176 ,  H04N19/70 ,  H04N19/109

Abstract: When a FRUC mode is enabled for a current coding unit (CU), motion vector (MV) candidates may be derived for the current CU, One or more search MVs may be derived from the MV candidates so that an initiai motion search may be performed for the current CU using the search MVs. The search MVs, which may be fewer than the MV candidates for the CU, may be derived based on one or more attributes of the MV candidates. At the sub-CU level, sub-CU MV candidates may be determined for a current sub-CU. Sub-CU search MVs may be derived from the sub-CU MV candidates for the current sub-CU so that a motion search may be performed for the current sub-CU using the sub-CU search MVs. The number of the sub-CU search MVs may be smaller than the number of the sub-CU MV candidates.

公开(公告)号：WO2018045332A1

公开(公告)日：2018-03-08

申请号：PCT/US2017/049937

申请日：2017-09-01

Applicant: VID SCALE, INC.

Inventor： XIU, Xiaoyu ,  HE, Yuwen

IPC: H04N19/70 ,  H04N19/96

CPC classification number: H04N19/70 ,  H04N19/96

Abstract: Systems and methods are proposed herein for coded block flag (CBF) signaling. In some embodiments, a hierarchical signaling method is used to signal the CBFs of chroma components for the quad-tree plus binary tree (QTBT) structure. A CBF flag may be signaled at each QTBT node level for each chroma component, indicating whether any descendent QTBT leaf node under the current level is associated with a non-zero coefficient. In some embodiments, for inter-coded pictures, a flag at the QTBT root node may indicate whether there are non-zero transform coefficients in the descendent leaf nodes that originate from the current root node. When the flag is equal to 1, the coefficients of the descendent leaf nodes under the current node may be signaled; otherwise, no further residual information is transmitted and all the transform coefficients are inferred to be 0.

Abstract translation: 这里提出了用于编码块标志（CBF）信令的系统和方法。 在一些实施例中，使用分层信令方法来用信号通知四叉树加二叉树（QTBT）结构的色度分量的CBF。 CBF标志可以在每个QTBT节点级针对每个色度分量用信号通知，指示当前级别下的任何派生QTBT叶节点是否与非零系数相关联。 在一些实施例中，对于帧间编码图片，QTBT根节点处的标志可以指示在源自当前根节点的后代叶节点中是否存在非零变换系数。 当标志等于1时，可以发信号通知当前节点下属的叶子节点的系数; 否则，不会传输更多的残差信息，并且所有变换系数都被推断为0。

公开(公告)号：WO2017192898A1

公开(公告)日：2017-11-09

申请号：PCT/US2017/031133

申请日：2017-05-04

Applicant: VID SCALE, INC.

Inventor： XIU, Xiaoyu ,  HE, Yuwen ,  YE, Yan

IPC: H04N19/176 ,  H04N19/147 ,  H04N19/11 ,  H04N19/463 ,  H04N19/182 ,  H04N19/59

CPC classification number: H04N19/105 ,  H04N19/11 ,  H04N19/147 ,  H04N19/176 ,  H04N19/182 ,  H04N19/463 ,  H04N19/59 ,  H04N19/593

Abstract: Systems and methods are described for control-point based intra mode for coding a video bitstream. In an exemplary embodiment, at least two control points in a picture are selected. The control points may be, for example, points at or adjacent to two or more corners of a current block. For each of the control points, an associated intra prediction direction is identified. The intra prediction directions may be encoded in the bitstream, e.g. using differential coding. A derived intra prediction direction is interpolated based on a position of a pixel (or of a block) relative to the control points, and the derived intra prediction direction is used to predict one or more samples in the video. Different interpolation techniques, such as triangular interpolation or bilinear interpolation may be used.

Abstract translation: 针对编码视频比特流的基于控制点的帧内模式描述了系统和方法。 在示例性实施例中，选择图片中的至少两个控制点。 控制点可以是例如在当前块的两个或更多个拐角处或与其相邻的点。 对于每个控制点，识别相关联的帧内预测方向。 帧内预测方向可以被编码在比特流中，例如， 使用差分编码。 导出的帧内预测方向是基于像素（或块的）相对于控制点的位置而被内插的，并且导出的帧内预测方向被用于预测视频中的一个或多个样本。 可以使用不同的插值技术，例如三角插值或双线性插值。

公开(公告)号：WO2017083553A1

公开(公告)日：2017-05-18

申请号：PCT/US2016/061379

申请日：2016-11-10

Applicant: VID SCALE, INC.

Inventor： WANG, Miaohui ,  HE, Yuwen ,  YE, Yan ,  XIU, Xiaoyu

IPC: H04N19/119 ,  H04N19/14 ,  H04N19/147 ,  H04N19/174 ,  H04N19/70

CPC classification number: H04N19/119 ,  H04N19/14 ,  H04N19/147 ,  H04N19/174 ,  H04N19/70

Abstract: Systems and methods are provided for video coding (e.g., encoding and/or decoding). A coding device may include a processor. The processor may be configured to receive a video frame and partition the video frame into a super coding units (SCUs). The processor may be configured to partition each of the SCUs into coding tree units (CTUs) based on a coding mode.

Abstract translation: 系统和方法被提供用于视频编码（例如，编码和/或解码）。 编码设备可以包括处理器。 处理器可以被配置为接收视频帧并将视频帧划分为超级编码单元（SCU）。 处理器可以被配置为基于编码模式将每个SCU分割成编码树单元（CTU）。

公开(公告)号：WO2017059415A1

公开(公告)日：2017-04-06

申请号：PCT/US2016/055143

申请日：2016-10-03

Applicant: VID SCALE, INC.

Inventor： HE, Yuwen ,  YE, Yan ,  KEROFSKY, Louis

IPC: H04N1/60 ,  H04N19/186

CPC classification number: H04N1/6005 ,  H04N19/85

Abstract: Color correction in high dynamic range video (HDR) using 2D look-up table (LUT) may be provided. The color correction may be applied in a decoder after decoding the HDR video signal. For example, the color correction may be applied before, during, or after chroma upsampling of the HDR video signal. The 2D LUT may include a representation of the color space of the HDR video signal. The color correction may include applying triangle interpolation to the sample values of the color component of the color space. The 2D LUT may be estimated by an encoder and signaled to the decoder. The encoder may decide to reuse a prior-signaled 2D LUT or use a new 2D LUT.

Abstract translation: 可以提供使用2D查找表（LUT）的高动态范围视频（HDR）中的颜色校正。 在解码HDR视频信号之后，可以在解码器中应用颜色校正。 例如，可以在HDR视频信号的色度上采样之前，期间或之后应用颜色校正。 2D LUT可以包括HDR视频信号的颜色空间的表示。 颜色校正可以包括对颜色空间的颜色分量的样本值应用三角形插值。 2D LUT可以由编码器估计并发送给解码器。 编码器可以决定重用先前信号的2D LUT或使用新的2D LUT。