公开(公告)号：US10455249B2

公开(公告)日：2019-10-22

申请号：US15073171

申请日：2016-03-17

Applicant: QUALCOMM Incorporated

Inventor： Li Zhang ,  Jianle Chen ,  Marta Karczewicz

IPC: H04N19/593 ,  H04N19/117 ,  H04N19/70 ,  H04N19/80 ,  H04N19/186 ,  H04N19/44 ,  H04N19/176 ,  H04N19/167 ,  H04N19/59

Abstract: Example techniques related to linear model (LM) prediction decoding or encoding are described. A video decoder or video encoder determines which filter to apply from a set of filters to downsample samples of a luma block and generate a predictive block for a corresponding chroma block based on characteristics of the chroma block.

公开(公告)号：US20190320172A1

公开(公告)日：2019-10-17

申请号：US16381958

申请日：2019-04-11

Applicant: QUALCOMM Incorporated

Inventor： Li Zhang ,  Cheng-Teh Hsieh ,  Kai Zhang ,  Akshay Gadde ,  Wei-Jung Chien ,  Marta Karczewicz

IPC: H04N19/117 ,  H04N19/189 ,  H04N19/70 ,  H04N19/169

Abstract: A video decoder configured to determine filter information for a region of a picture of video data; for a largest coding unit (LCU) of the region, determine a size for a current unit based on a location of the LCU within the picture, wherein the size for the current unit is different than a size of the LCU; and based on the determined filter information, determine a filter for the current unit of the region; and filter the current unit with the determined filter.

公开(公告)号：US20190306502A1

公开(公告)日：2019-10-03

申请号：US16371764

申请日：2019-04-01

Applicant: QUALCOMM Incorporated

Inventor： Akshay GADDE ,  Li Zhang ,  Marta Karczewicz ,  Wei-Jung Chein

IPC: H04N19/117 ,  H04N19/136 ,  H04N19/82 ,  H04N19/132 ,  H04N19/124 ,  H04N19/70

Abstract: Methods and systems for improved adaptive loop filters (ALFs) used in post-processing stage of in-loop coding or the prediction stage of video coding. To account for various shortcomings, techniques to improve coding gains and visual quality of ALFs are discussed. First, refinement of ALF coefficients for each block is allowed wherein different units (used for class calculation, e.g., 2×2 sub-blocks in GALF) located in different blocks with the same class index may have different filters. Second, ALF filters can be modified or weakened to without signaling ALF filter coefficients.

公开(公告)号：US20190260996A1

公开(公告)日：2019-08-22

申请号：US16268939

申请日：2019-02-06

Applicant: QUALCOMM Incorporated

Inventor： Kai Zhang ,  Li Zhang ,  Wei-Jung Chien ,  Marta Karczewicz

IPC: H04N19/132 ,  H04N19/105 ,  H04N19/186 ,  H04N19/176

Abstract: A method of processing video data includes determining, by processing circuitry, a plurality of neighboring samples for predicting a current block. The plurality of neighboring samples are arranged outside of a region of a current picture, the region comprising the current block, a row of samples adjacent to a top row of the current block, and a column of samples adjacent to a left column of the current block. The method further comprises deriving, by the processing circuitry, local illumination compensation information for the current block using the plurality of neighboring samples and generating, by the processing circuitry, a prediction block using the local illumination compensation information.

公开(公告)号：US20190158837A1

公开(公告)日：2019-05-23

申请号：US16195590

申请日：2018-11-19

Applicant: QUALCOMM Incorporated

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

IPC: H04N19/13 ,  H04N19/167 ,  H04N19/184 ,  H04N19/70 ,  H04N19/55 ,  H04N19/177

Abstract: A method of decoding video data includes determining, by a video decoder implemented in processing circuitry, a context initialization using a plurality of quantization parameters for a portion of a picture of video data decoded using temporal prediction. The method includes storing, by the video decoder, the context initialization with a single probability state for the plurality of quantization parameters. The method includes entropy decoding, by the video decoder, a set of syntax elements in a bitstream using the single probability state.

公开(公告)号：US10200719B2

公开(公告)日：2019-02-05

申请号：US15359568

申请日：2016-11-22

Applicant: QUALCOMM Incorporated

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

IPC: H04N19/60 ,  H04N19/119 ,  H04N19/61 ,  H04N19/91 ,  H04N19/176 ,  H04N19/587 ,  H04N19/124 ,  H04N19/13 ,  H04N19/186 ,  H04N19/573 ,  H04N19/59 ,  H04N19/96 ,  G06F17/14 ,  H04N19/597 ,  H04N19/105 ,  H04N19/122 ,  H04N19/593 ,  H04N19/132 ,  H04N19/82 ,  H04N19/42 ,  H04N19/625

Abstract: As part of a process of encoding video data, a video encoder applies a transform to a non-square residual block to generate a block of transform coefficients. Furthermore, the video encoder modifies the transform coefficients such that each respective transform coefficient of the block of transform coefficients is based on the respective dequantized transform coefficient multiplied by a factor of √{square root over (2)} or an approximation of √{square root over (2)}. As part of a process of decoding video data, a video decoder applies, by the video decoder, a dequantization process to transform coefficients of a non-square transform block. The video decoder modifies the dequantized transform coefficients such that each respective dequantized transform coefficient of the dequantized transform coefficients is based on the respective dequantized transform coefficient divided by a factor of √{square root over (2)} or an approximation of √{square root over (2)}.

公开(公告)号：US10200711B2

公开(公告)日：2019-02-05

申请号：US15080478

申请日：2016-03-24

Applicant: QUALCOMM Incorporated

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

IPC: H04N7/12 ,  H04N19/513 ,  H04N19/70 ,  H04N19/119 ,  H04N19/139 ,  H04N19/176 ,  H04N19/44 ,  H04N19/52 ,  H04N19/56 ,  H04N19/46 ,  H04N19/96 ,  H04N19/109 ,  H04N19/57

Abstract: In an example, a method of processing video data includes determining a candidate motion vector for deriving motion information of a current block of video data, where the motion information indicates motion of the current block relative to reference video data. The method also includes determining a derived motion vector for the current block based on the determined candidate motion vector, where determining the derived motion vector comprises performing a motion search for a first set of reference data that corresponds to a second set of reference data outside of the current block.

公开(公告)号：US10158876B2

公开(公告)日：2018-12-18

申请号：US14247928

申请日：2014-04-08

Applicant: QUALCOMM Incorporated

Inventor： Ying Chen ,  Li Zhang

IPC: H04N19/52 ,  H04N19/597

Abstract: In one example, a device for coding video data includes a video coder configured to code motion information for a block of multiview video data, wherein the motion information includes a reference index that identifies a reference picture comprising a source for backward-warping view synthesis prediction (BVSP), perform BVSP on a portion of the reference picture to produce a BVSP reference block, and predict the block using the BVSP reference block.

公开(公告)号：US20180324464A1

公开(公告)日：2018-11-08

申请号：US15973347

申请日：2018-05-07

Applicant: QUALCOMM Incorporated

Inventor： Li Zhang ,  Nan Hu ,  Wei-Jung Chien ,  Marta Karczewicz

IPC: H04N19/61 ,  H04N19/70 ,  H04N19/176 ,  H04N19/186 ,  H04N19/103 ,  H04N19/159

CPC classification number: H04N19/61 ,  H04N19/103 ,  H04N19/159 ,  H04N19/176 ,  H04N19/186 ,  H04N19/70

Abstract: A device for coding video data is configured to code a first syntax element, wherein a value for the first syntax element indicates whether there is at least one non-zero transform coefficient level associated with a first block of video data; determine a context for a second syntax element based on the value for the first syntax element, wherein the second syntax element indicates coding mode information for a second block of video data; and code the second syntax element based on the determined context.

公开(公告)号：US20180220130A1

公开(公告)日：2018-08-02

申请号：US15879359

申请日：2018-01-24

Applicant: QUALCOMM Incorporated

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

IPC: H04N19/117 ,  H04N19/176 ,  H04N19/14 ,  H04N19/159 ,  H04N19/186 ,  H04N19/82

Abstract: An example method of filtering a reconstructed block of video data includes obtaining, by one or more processors, reconstructed samples of a current block of the video data; and selectively bilaterally filtering, by the one or more processors, the reconstructed samples of the current block to generate a filtered current block. In this example, selectively bilaterally filtering the reconstructed samples of the current block comprises refraining from bilaterally filtering at least one reconstructed sample of the current block such that the filtered current block includes at least one non-bilaterally filtered sample.