公开(公告)号：US12212736B2

公开(公告)日：2025-01-28

申请号：US17809167

申请日：2022-06-27

Applicant: QUALCOMM Incorporated

Inventor： Chun-Chi Chen ,  Han Huang ,  Cheng-Teh Hsieh ,  Wei-Jung Chien ,  Zhi Zhang ,  Yao-Jen Chang ,  Yan Zhang ,  Vadim Seregin ,  Marta Karczewicz

IPC: H04N19/105 ,  H04N19/132 ,  H04N19/137 ,  H04N19/176

Abstract: A device for decoding video data includes a memory configured to store video data; and one or more processors implemented in circuitry and configured to: determine a deterministic bounding box from which to retrieve reference samples of reference pictures of video data for performing decoder-side motion vector derivation (DMVD) for a current block of the video data; derive a motion vector for the current block according to DMVD using the reference samples within the deterministic bounding box; form a prediction block using the motion vector; and decode the current block using the prediction block.

公开(公告)号：US12160574B2

公开(公告)日：2024-12-03

申请号：US17806221

申请日：2022-06-09

Applicant: QUALCOMM Incorporated

Inventor： Yao-Jen Chang ,  Han Huang ,  Vadim Seregin ,  Marta Karczewicz

IPC: H04N19/119 ,  H04N19/105 ,  H04N19/139 ,  H04N19/159 ,  H04N19/176 ,  H04N19/52 ,  H04N19/573

Abstract: A video coder may be configured to determine a partitioning for a block of video data using geometric partitioning mode; construct two uni-prediction motion vector candidate lists for the block of video data, and code the block of video data using uni-prediction based on at least one of the two uni-prediction motion vector candidate lists to generate a decoded block of video data.

公开(公告)号：US11997258B2

公开(公告)日：2024-05-28

申请号：US17931656

申请日：2022-09-13

Applicant: QUALCOMM Incorporated

Inventor： Keming Cao ,  Yao-Jen Chang ,  Bappaditya Ray ,  Vadim Seregin ,  Marta Karczewicz

IPC: H04N19/105 ,  H04N19/159 ,  H04N19/169 ,  H04N19/176

CPC classification number: H04N19/105 ,  H04N19/159 ,  H04N19/176 ,  H04N19/1883

Abstract: A video encoder and video decoder are configured to code video data using multiple reference line processing. The video encoder and video decoder may determine a number of reference lines to use for multiple reference line processing based on an intra prediction mode, and decode a block of video data using the multiple reference line processing based on the number of reference lines.

公开(公告)号：US20240129458A1

公开(公告)日：2024-04-18

申请号：US18483891

申请日：2023-10-10

Applicant: QUALCOMM Incorporated

Inventor： Yao-Jen Chang ,  Vadim Seregin ,  Bappaditya Ray ,  Marta Karczewicz

IPC: H04N19/107 ,  H04N19/117 ,  H04N19/132 ,  H04N19/136 ,  H04N19/176 ,  H04N19/186 ,  H04N19/503 ,  H04N19/593 ,  H04N19/70

CPC classification number: H04N19/107 ,  H04N19/117 ,  H04N19/132 ,  H04N19/136 ,  H04N19/176 ,  H04N19/186 ,  H04N19/503 ,  H04N19/593 ,  H04N19/70

Abstract: A method coding video data includes receiving a block of video data, wherein chroma samples of the block of video data are subsampled relative to luma samples of the block of video data (e.g., 4:2:0 or 4:2:2 video content). A video coder may determine a subsampling technique, from a plurality of subsampling techniques, for the luma samples of the block of video data for a cross-component prediction mode, and may code the block of video data using the subsampling technique and the cross-component prediction mode. A first subsampling technique of the plurality of subsampling techniques includes not applying subsampling to the luma samples of the block of video data, and a second subsampling technique of the plurality of subsampling techniques includes a combination of downsampling filters to be applied to the luma samples of the block.

公开(公告)号：US11936877B2

公开(公告)日：2024-03-19

申请号：US17715571

申请日：2022-04-07

Applicant: QUALCOMM Incorporated

Inventor： Chun-Chi Chen ,  Han Huang ,  Zhi Zhang ,  Yao-Jen Chang ,  Yan Zhang ,  Vadim Seregin ,  Marta Karczewicz

IPC: H04N19/176 ,  H04N19/105 ,  H04N19/132 ,  H04N19/137

CPC classification number: H04N19/137 ,  H04N19/105 ,  H04N19/132 ,  H04N19/176

Abstract: A video decoder can be configured to determine that a current block in a current picture of the video data is coded in an affine prediction mode; determine one or more control-point motion vectors (CPMVs) for the current block; identify an initial prediction block for the current block in a reference picture using the one or more CPMVs; determine a current template for the current block in the current picture; and determine an initial reference template for the initial prediction block in the reference picture; and perform a motion vector refinement process to determine a modified prediction block based on a comparison of the current template to the initial reference template.

公开(公告)号：US20240015295A1

公开(公告)日：2024-01-11

申请号：US18339302

申请日：2023-06-22

Applicant: QUALCOMM Incorporated

Inventor： Keming Cao ,  Bappaditya Ray ,  Yao-Jen Chang ,  Vadim Seregin ,  Marta Karczewicz

IPC: H04N19/132 ,  H04N19/105 ,  H04N19/159 ,  H04N19/176

CPC classification number: H04N19/132 ,  H04N19/105 ,  H04N19/159 ,  H04N19/176

Abstract: A method of decoding video data includes generating a fusion of predictors from two or more reference lines of samples relative to a block of video data based on an intra-prediction mode. The method further includes decoding the block of video data using the fusion of predictors and the intra-prediction mode.

公开(公告)号：US20230247216A1

公开(公告)日：2023-08-03

申请号：US18153949

申请日：2023-01-12

Applicant: QUALCOMM Incorporated

Inventor： Han Huang ,  Yao-Jen Chang ,  Chun-Chi Chen ,  Marta Karczewicz ,  Vadim Seregin ,  Yan Zhang ,  Zhi Zhang

IPC: H04N19/513 ,  H04N19/44

CPC classification number: H04N19/513 ,  H04N19/44

Abstract: An example device for decoding video data includes one or more processors implemented in circuitry and configured t: form first and second prediction blocks using first and second motion vectors and combine the first and second prediction blocks according to BDOF to form a final prediction block. For at least one sample location, the one or more processors are configured to determine that a first predictor for the at least one sample location is outside of a boundary of the first reference picture; determine that a second predictor for the at least one sample location is within a boundary of the second reference picture; set the first predictor equal to the second predictor; and determine a final BDOF value for a sample at the at least one sample location using the first predictor and the second predictor.

公开(公告)号：US11563980B2

公开(公告)日：2023-01-24

申请号：US17219147

申请日：2021-03-31

Applicant: QUALCOMM Incorporated

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

IPC: H04N19/70 ,  H04N19/136 ,  H04N19/159

Abstract: A method of processing video data comprises performing a bitstream conformance process that determines whether a bitstream that comprises an encoded representation of the video data conforms to a video coding standard, wherein the bitstream conformance process determines that the bitstream does not conform to the video coding standard when at least one of: a chroma-related constraint flag is equal to 0 and when there are no chroma components for pictures in the bitstream, or an inter prediction-related constraint flag is equal to 0 when all slices of the bitstream are I slices.

公开(公告)号：US20220400257A1

公开(公告)日：2022-12-15

申请号：US17806221

申请日：2022-06-09

Applicant: QUALCOMM Incorporated

Inventor： Yao-Jen Chang ,  Han Huang ,  Vadim Seregin ,  Marta Karczewicz

IPC: H04N19/119 ,  H04N19/52 ,  H04N19/139 ,  H04N19/176 ,  H04N19/573 ,  H04N19/105 ,  H04N19/159

Abstract: A video coder may be configured to determine a partitioning for a block of video data using geometric partitioning mode; construct two uni-prediction motion vector candidate lists for the block of video data, and code the block of video data using uni-prediction based on at least one of the two uni-prediction motion vector candidate lists to generate a decoded block of video data.

公开(公告)号：US20210385497A1

公开(公告)日：2021-12-09

申请号：US17340727

申请日：2021-06-07

Applicant: QUALCOMM Incorporated

Inventor： Yong He ,  Yao-Jen Chang ,  Vadim Seregin ,  Muhammed Zeyd Coban

IPC: H04N19/70 ,  H04N19/105 ,  H04N19/184 ,  H04N19/172

Abstract: An example method includes decoding, from a coded video bitstream, a first syntax element that specifies a constraint for a second syntax element that specifies whether subpicture information is present in the coded video bitstream and whether more than one subpicture is allowed to be present in the coded video bitstream; and decoding, based on the constraint specified by the first syntax element, the second syntax element.