公开(公告)号：US10057574B2

公开(公告)日：2018-08-21

申请号：US15040913

申请日：2016-02-10

Applicant: QUALCOMM Incorporated

Inventor： Xiang Li ,  Hongbin Liu ,  Ying Chen ,  Xin Zhao ,  Li Zhang ,  Jianle Chen ,  Marta Karczewicz

IPC: H04N19/117 ,  H04N19/70 ,  H04N19/61 ,  H04N19/593 ,  H04N19/176 ,  H04N19/50 ,  H04N19/503 ,  H04N19/82 ,  H04N19/86

CPC classification number: H04N19/117 ,  H04N19/176 ,  H04N19/50 ,  H04N19/503 ,  H04N19/593 ,  H04N19/61 ,  H04N19/70 ,  H04N19/82 ,  H04N19/86

Abstract: Examples include a device for coding video data, the device including a memory configured to store video data, and one or more processors configured to obtain adaptive loop filtering (ALF) information for a current coding tree unit (CTU) from one or more of: (i) one or more spatial neighbor CTUs of the current CTU or (ii) one or more temporal neighbor CTUs of the current CTU, to form a candidate list based at least partially on the obtained ALF information for the current CTU, and to perform a filtering operation on the current CTU using ALF information associated with a candidate from the candidate list. Coding video data includes encoding video data, decoding video data, or both encoding and decoding video data.

公开(公告)号：US20180199072A1

公开(公告)日：2018-07-12

申请号：US15862203

申请日：2018-01-04

Applicant: QUALCOMM Incorporated

Inventor： Xiang Li ,  Xin Zhao ,  Li Zhang ,  Jianle Chen ,  Hsiao-Chiang Chuang ,  Marta Karczewicz

IPC: H04N19/96 ,  H04N19/176 ,  H04N19/61 ,  H04N19/18 ,  H04N19/124 ,  H04N19/105 ,  H04N19/13 ,  H04N19/159

Abstract: A method of decoding video comprising: receiving an encoded block of video data, determining a transform for the encoded block of video data, wherein the transform has a size S that is not a power of two, rounding S to a power of two creating a transform with a modified size S′, applying an inverse transform with the modified size S′ to the encoded block of video data to create residual video data, and decoding the residual video data to create decoded block of video data.

公开(公告)号：US20180103252A1

公开(公告)日：2018-04-12

申请号：US15782686

申请日：2017-10-12

Applicant: QUALCOMM Incorporated

Inventor： Cheng-Teh Hsieh ,  Vadim Seregin ,  Xin Zhao ,  Amir Said ,  Vijayaraghavan Thirumalai ,  Marta Karczewicz

IPC: H04N19/122 ,  H04N19/176 ,  H04N19/169 ,  H04N19/18

CPC classification number: H04N19/122 ,  H04N19/124 ,  H04N19/176 ,  H04N19/18 ,  H04N19/1883

Abstract: In general, the disclosure describes a video coding device (e.g., a video encoder or a video decoder) configured to perform various transformations on video data. The video coding device applies a primary transform to a block of the video data, the primary transform having a first size, and the sub-block being at least a portion of the block. The video coding device determines whether application of a secondary transform, having a second size, to a sub-block of the block is allowed. Application of the secondary transform is disallowed when the first size is equal to the second size. Based on the application of the secondary transform being allowed, the video coding device applies the secondary transform to the sub-block. Application of the primary transform and the secondary transform construct a residual block in a pixel domain.

公开(公告)号：US20180098064A1

公开(公告)日：2018-04-05

申请号：US15723950

申请日：2017-10-03

Applicant: QUALCOMM Incorporated

Inventor： Vadim Seregin ,  Nan Hu ,  Wei-Jung Chien ,  Marta Karczewicz ,  Xin Zhao ,  Vijayaraghavan Thirumalai

IPC: H04N19/11 ,  H04N19/176 ,  H04N19/159 ,  H04N19/593

CPC classification number: H04N19/11 ,  H04N19/157 ,  H04N19/159 ,  H04N19/176 ,  H04N19/463 ,  H04N19/593

Abstract: A video coder determines a first block of the video data is intra mode coded; based on a first height and the first width of the first block, identifies a group of N available intra prediction modes for the first block of video data; selects from the group of N available intra prediction modes, a first intra prediction mode used to code the first block of the video data; and codes the first block using the first intra prediction mode. A video coder generates a first most probable mode (MPM) candidate list for the block; codes a first flag indicating an actual intra prediction mode used to code the block is not included in the first MPM candidate list; generates a second MPM candidate list by deriving at least one candidate intra prediction mode based on an intra prediction mode in the first MPM candidate list.

公开(公告)号：US20170332084A1

公开(公告)日：2017-11-16

申请号：US15590261

申请日：2017-05-09

Applicant: QUALCOMM Incorporated

Inventor： Vadim Seregin ,  Xin Zhao ,  Amir Said ,  Marta Karczewicz ,  Nan Hu ,  Wei-Jung Chien ,  Vijayaraghavan Thirumalai

IPC: H04N19/159 ,  H04N5/926 ,  H04N19/593 ,  H04N1/417 ,  H04N9/808 ,  H04N9/804

CPC classification number: H04N19/159 ,  H04N1/417 ,  H04N5/9262 ,  H04N9/8045 ,  H04N9/8082 ,  H04N19/11 ,  H04N19/157 ,  H04N19/176 ,  H04N19/463 ,  H04N19/593 ,  H04N19/91

Abstract: A device for coding video data is configured to determine that a current block of video data is coded using an intra prediction mode; add an intra prediction mode of a first neighboring block of the current block to a most probable mode candidate list for the current block; add an intra prediction mode for a second neighboring block of the current block to the most probable mode candidate list for the current block; add an intra prediction mode for a third neighboring block of the current block to the most probable mode candidate list for the current block; and code the current block of video data using an intra prediction mode.

公开(公告)号：US09756359B2

公开(公告)日：2017-09-05

申请号：US14569126

申请日：2014-12-12

Applicant: QUALCOMM Incorporated

Inventor： Xin Zhao ,  Ying Chen ,  Li Zhang

IPC: H04N19/597 ,  H04N19/52 ,  H04N19/11

CPC classification number: H04N19/597 ,  H04N19/11 ,  H04N19/52

Abstract: In some examples, a method of decoding depth data in a video coding process includes defining a depth prediction unit (PU) of a size greater than 32×32 within a depth coding unit (CU) and generating one or more partitions of the depth PU. The method also includes obtaining residual data for each of the partitions; obtaining prediction data for each of the partitions; and reconstructing each of the partitions based on the residual data and the prediction data for the respective partitions.

公开(公告)号：US20170150176A1

公开(公告)日：2017-05-25

申请号：US15359563

申请日：2016-11-22

Applicant: QUALCOMM Incorporated

Inventor： Li Zhang ,  Jianle Chen ,  Wei-Jung Chien ,  Xin Zhao ,  Xiang Li ,  Marta Karczewicz

IPC: H04N19/59 ,  H04N19/186 ,  H04N19/573 ,  H04N19/61 ,  H04N19/91 ,  H04N19/587 ,  H04N19/124 ,  H04N19/13

CPC classification number: H04N19/649 ,  G06F17/147 ,  H04N19/105 ,  H04N19/119 ,  H04N19/122 ,  H04N19/124 ,  H04N19/13 ,  H04N19/132 ,  H04N19/176 ,  H04N19/186 ,  H04N19/42 ,  H04N19/573 ,  H04N19/587 ,  H04N19/59 ,  H04N19/593 ,  H04N19/597 ,  H04N19/61 ,  H04N19/625 ,  H04N19/82 ,  H04N19/91 ,  H04N19/96

Abstract: A video coder reconstructs a set of chroma reference samples and reconstructs luma samples of a non-square prediction unit. Additionally, the video coder sub-samples the set of luma reference samples such that a total number of the luma reference samples that neighbor a longer side of the non-square prediction block is the same as a total number of the luma reference samples that neighbor a shorter side of the non-square prediction block. The video coder determines a Linear Model (LM) parameter based on: β=(Σyi−α·Σxi)/I, where I is a total number of reference samples in the set of the luma reference samples, xi is a luma reference sample in the set of luma reference samples, yi is a chroma reference sample in the set of chroma reference samples. The video coder uses the LM parameter in a process to determine values of chroma samples of the non-square prediction block.

公开(公告)号：US20170094314A1

公开(公告)日：2017-03-30

申请号：US15270507

申请日：2016-09-20

Applicant: QUALCOMM Incorporated

Inventor： Xin Zhao ,  Jianle Chen ,  Amir Said ,  Marta Karczewicz ,  Vadim Seregin

IPC: H04N19/61 ,  H04N19/159 ,  H04N19/124 ,  H04N19/625 ,  H04N19/122 ,  H04L12/26

Abstract: Techniques are described in which a decoder is configured to reorganize a first 2-dimensional coefficient block as a first 1-dimensional coefficient vector according to a coefficient scanning order and apply a first inverse transform to the first 1-dimensional coefficient vector to generate a second 1-dimensional coefficient vector. The first inverse transform is a non-separable transform. The decoder is further configured to reorganize the first 1-dimensional coefficient vector as a second 2-dimensional coefficient block and apply a second inverse transform to the second 2-dimensional coefficient block to generate a residual video block. The second inverse transform converts the second 2-dimensional coefficient block from a frequency domain to a pixel domain. The decoder is further configured to form a decoded video block, wherein forming the decoded video block comprises summing the residual video block with one or more predictive blocks.

公开(公告)号：US20170094313A1

公开(公告)日：2017-03-30

申请号：US15270455

申请日：2016-09-20

Applicant: QUALCOMM Incorporated

Inventor： Xin Zhao ,  Jianle Chen ,  Amir Said ,  Marta Karczewicz ,  Vadim Seregin

IPC: H04N19/61 ,  H04N1/32 ,  H04N19/159 ,  H04N19/124 ,  H04N19/625

CPC classification number: H04N19/61 ,  H04L43/16 ,  H04N1/32181 ,  H04N19/12 ,  H04N19/122 ,  H04N19/124 ,  H04N19/159 ,  H04N19/176 ,  H04N19/18 ,  H04N19/182 ,  H04N19/625

Abstract: Techniques are described in which a decoder is configured to inverse quantize a first coefficient block and apply a first inverse transform to at least part of the inverse quantized first coefficient block to generate a second coefficient block. The first inverse transform is a non-separable transform. The decoder is further configured to apply a second inverse transform to the second coefficient block to generate a residual video block. The second inverse transform converts the second coefficient block from a frequency domain to a pixel domain. The decoder is further configured to form a decoded video block, wherein forming the decoded video block comprises summing the residual video block with one or more predictive blocks.

公开(公告)号：US20160373742A1

公开(公告)日：2016-12-22

申请号：US15184067

申请日：2016-06-16

Applicant: QUALCOMM Incorporated

Inventor： Xin Zhao ,  Jianle Chen ,  Li Zhang ,  Marta Karczewicz

IPC: H04N19/11 ,  H04N19/147 ,  H04N19/18 ,  H04N19/176

CPC classification number: H04N19/11 ,  H04N19/13 ,  H04N19/136 ,  H04N19/147 ,  H04N19/176 ,  H04N19/18 ,  H04N19/463 ,  H04N19/593 ,  H04N19/91

Abstract: A device includes one or more processors configured to derive M most probable modes (MPMs) for intra prediction of a block of video data. A syntax element that indicates whether a MPM index or a non-MPM index is used to indicate a selected intra prediction mode of the plurality of intra prediction modes for intra prediction of the block of video data is decoded. The one or more processors are configured such that, based on the MPM index indicating the selected intra prediction mode, the one or more processors decode the non-MPM index. The non-MPM index is encoded in the bitstream as a code word shorter than [log2 N] bits if the non-MPM index satisfies a criterion and is encoded in the bitstream as a fixed length code with [log2 N] bits otherwise. The one or more processors reconstruct the block based on the selected intra prediction mode.

Abstract translation: 一种设备包括被配置为导出M个最可能模式（MPM）的一个或多个处理器，用于视频数据块的帧内预测。 指示MPM索引或非MPM索引是否用于指示用于视频数据块的帧内预测的多个帧内预测模式的所选帧内预测模式的语法元素被解码。 一个或多个处理器被配置为使得基于指示所选择的帧内预测模式的MPM索引，一个或多个处理器解码非MPM索引。 如果非MPM索引满足标准，则将非MPM索引作为比[log2N]比特短的代码字被编码在比特流中，否则以[log2 N]比特被编码在比特流中作为固定长度码。 一个或多个处理器基于所选择的帧内预测模式重构块。