公开(公告)号：US11128876B2

公开(公告)日：2021-09-21

申请号：US16816107

申请日：2020-03-11

Applicant: QUALCOMM Incorporated

Inventor： Yung-Hsuan Chao ,  Muhammed Zeyd Coban ,  Hongtao Wang ,  Marta Karczewicz

IPC: H04N19/186 ,  H04N19/176 ,  H04N19/61 ,  H04N19/50 ,  H04N19/70

Abstract: A video decoder configured to receive a first syntax element indicating if any coding group (CG) of a plurality of CGs includes at least one non-zero coefficient, wherein the plurality of CGs includes a luma CG and at least one chroma CG; in response to the first syntax element indicating that a CG of a plurality of CGs includes at least one non-zero coefficient, receive, for each CG of the plurality of CGs, a flag indicating if a corresponding CG of the plurality of CGs includes at least one non-zero coefficient; and for a CG with a corresponding flag indicating that the CG includes at least one non-zero coefficient, receive additional syntax indicating values for coefficients of the CG.

公开(公告)号：US11115658B2

公开(公告)日：2021-09-07

申请号：US16893974

申请日：2020-06-05

Applicant: QUALCOMM Incorporated

Inventor： Thibaud Laurent Biatek ,  Geert Van der Auwera ,  Adarsh Krishnan Ramasubramonian ,  Marta Karczewicz

IPC: H04N7/18 ,  H04N19/11 ,  H04N19/59 ,  H04N19/176 ,  H04N19/70 ,  H04N19/159 ,  H04N19/105 ,  H04N19/132 ,  H04N19/186 ,  H04N19/91 ,  H04N19/167 ,  H04N19/61 ,  H04N19/23 ,  H04N19/136 ,  G06T3/40 ,  G06T7/50

Abstract: A method of decoding video data includes predicting luma samples for a block of the video data using matrix intra prediction (MIP), where using MIP comprises down-sampling a set of luma neighboring samples to generate down-sampled luma neighboring samples. The method further includes predicting chroma samples for the block using cross-component linear model (CCLM) prediction, where using CCLM prediction comprises predicting the chroma samples for the block based on the down-sampled luma neighboring samples generated from the MIP. The method further includes determining a prediction block for the block based on the luma samples and the chroma samples, decoding a residual block for the block, and combining the prediction block and the residual block to decode the block.

公开(公告)号：US11102476B2

公开(公告)日：2021-08-24

申请号：US16723318

申请日：2019-12-20

Applicant: QUALCOMM Incorporated

Inventor： Han Huang ,  Wei-Jung Chien ,  Vadim Seregin ,  Marta Karczewicz

IPC: H04N19/105 ,  H04N19/149 ,  G06F1/03 ,  G06F17/16 ,  H04N19/176

Abstract: A device for processing video data includes a memory configured to store video data and one or more processors implemented in circuitry. The one or more processors are configured to select two or more subblocks of one or more blocks of video data and generate an affine motion model for a current block of video data using a subblock motion vector from each of the two or more subblocks as control-point motion vectors for the current block. The one or more processors are further configured to determine one or more prediction blocks based on the affine motion model and predict the current block with the one or more prediction blocks.

公开(公告)号：US11095893B2

公开(公告)日：2021-08-17

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 ,  H04N19/18 ,  H04N19/169 ,  H04N19/124

Abstract: A video coding device (e.g., a video encoder or a video decoder) is 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：US11057622B2

公开(公告)日：2021-07-06

申请号：US16714432

申请日：2019-12-13

Applicant: QUALCOMM Incorporated

Inventor： Geert Van der Auwera ,  Adarsh Krishnan Ramasubramonian ,  Vadim Seregin ,  Marta Karczewicz

IPC: H04N19/11 ,  H04N19/176

Abstract: A video decoder configured to determine a block of video data is intra predicted using an angular intra prediction mode, wherein the angular intra prediction mode is one of a bottom-left intra prediction mode or a top-right intra prediction mode; determine an aspect ratio of the block; locate one or more reference samples corresponding to the angular intra prediction mode; apply position dependent intra prediction combination to the reference samples to determine modified reference samples based on the aspect ratio of the block; and generate a predictive block for the block based on the modified reference samples.

公开(公告)号：US20210203982A1

公开(公告)日：2021-07-01

申请号：US17136983

申请日：2020-12-29

Applicant: QUALCOMM Incorporated

Inventor： Han Huang ,  Wei-Jung Chien ,  Vadim Seregin ,  Marta Karczewicz

IPC: H04N19/58 ,  H04N19/167 ,  H04N19/139 ,  H04N19/176 ,  H04N19/105

Abstract: A device for decoding video data can be configured to store a table of history-based motion vector predictors (HMVPs); determine motion information for a first block of the video data; add the motion information for the first block to the table of HMVPs in response to determining that the first block is located at a bottom-right corner of a motion estimation region (MER); and use the table of HMVPs to decode a second block of the video data.

公开(公告)号：US20210195195A1

公开(公告)日：2021-06-24

申请号：US17197883

申请日：2021-03-10

Applicant: QUALCOMM Incorporated

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

IPC: H04N19/124 ,  H04N19/61 ,  H04N19/176 ,  H04N19/12 ,  H04N19/103

Abstract: Example techniques are described to illustrate multiple transform applied for Intra prediction residual. It may be used in the context of advanced video codecs, such as extensions of HEVC or the next generation of video coding standards. A video encoder and a video decoder may select transform subsets that each identify one or more candidate transforms. The video encoder and the video decoder may determine transforms from the selected transform subsets.

公开(公告)号：US20210195192A1

公开(公告)日：2021-06-24

申请号：US17125159

申请日：2020-12-17

Applicant: QUALCOMM Incorporated

Inventor： Muhammed Zeyd Coban ,  Marta Karczewicz ,  Hilmi Enes Egilmez ,  Vadim Seregin

IPC: H04N19/12 ,  H04N19/176 ,  H04N19/18 ,  H04N19/70 ,  H04N19/60

Abstract: A video coder may determine, for a transform block of video data, that at least one coefficient group, of the transform block, that comprises a non-zero transform coefficient is outside of a lowest frequency region of the transform block, wherein the at least one coefficient group is one of a plurality of coefficient groups that each comprise transform coefficients. The video coder may determine not to code a syntax element indicative of a multiple transform selection (MTS) for the transform block based at least in part on the determination of that the at least one coefficient group is outside of the lowest frequency region of the transform block. The video coder may code the video data based at least in part on the determination not to code the syntax element indicative of the multiple transform selection for the transform block.

公开(公告)号：US20210195179A1

公开(公告)日：2021-06-24

申请号：US17126914

申请日：2020-12-18

Applicant: QUALCOMM Incorporated

Inventor： Muhammed Zeyd Coban ,  Vadim Seregin ,  Yao-Jen Chang ,  Marta Karczewicz

IPC: H04N19/107 ,  H04N19/70 ,  H04N19/503 ,  H04N19/593 ,  H04N19/186 ,  H04N19/176 ,  H04N19/172

Abstract: An example method of processing video data includes parsing at least one of a first flag of the video data, in a picture header, indicative of whether a set of inter slice syntax elements are included in the picture header, and a second flag of the video data, in the picture header, indicative of whether a set of intra slice syntax elements are included in the picture header, selectively parsing at least one of the set of inter slice syntax elements, in the picture header, based on the first flag and the set of intra slice syntax elements, in the picture header, based on the second flag, and reconstructing the picture based on at least one of the set of inter slice syntax elements and the set of intra slice syntax elements.

公开(公告)号：US11032572B2

公开(公告)日：2021-06-08

申请号：US15931271

申请日：2020-05-13

Applicant: QUALCOMM Incorporated

Inventor： Hilmi Enes Egilmez ,  Vadim Seregin ,  Muhammed Zeyd Coban ,  Marta Karczewicz

IPC: H04N19/61 ,  H04N19/176 ,  H04N19/44 ,  H04N19/70 ,  H04N19/50

Abstract: A video decoder is configured to determine a position of a last significant coefficient in a transform block of video data. The video decoder may then determine a value of a low-frequency non-separable transform (LFNST) index for the transform block based on the position of the last significant coefficient relative to a zero-out region of the transform block, wherein the zero-out region of the transform block includes both a first region within an LFNST region of the transform block and a second region of the transform block outside the LFNST region. The video decoder may then inverse transform the transform block in accordance with the value of the LFNST index.