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：US20220417521A1

公开(公告)日：2022-12-29

申请号：US17808510

申请日：2022-06-23

Applicant: QUALCOMM Incorporated

Inventor： Zhi Zhang ,  Chun-Chi Chen ,  Han Huang ,  Vadim Seregin ,  Marta Karczewicz

IPC: H04N19/137 ,  H04N19/105 ,  H04N19/159 ,  H04N19/176 ,  H04N19/70

Abstract: A video decoder can be configured to determine that a current block of the video data is coded in a bi-prediction inter mode; receive a first syntax element identifying a motion vector predictor from a first candidate list of motion vector predictors; receive a second syntax element identifying a motion vector difference; determine a first motion vector for the current block based on the motion vector predictor and the motion vector difference; determine a second motion vector for the current block from a second list of candidate motion vector predictors based on bilateral matching; and determine a prediction block for the current block using the first motion vector and the second motion vector.

公开(公告)号：US20220210438A1

公开(公告)日：2022-06-30

申请号：US17558119

申请日：2021-12-21

Applicant: QUALCOMM Incorporated

Inventor： Chun-Chi Chen ,  Han Huang ,  Zhi Zhang ,  Vadim Seregin ,  Marta Karczewicz

IPC: H04N19/159 ,  H04N19/139 ,  H04N19/176 ,  H04N19/70 ,  H04N19/132 ,  H04N19/513 ,  H04N19/172

Abstract: A video decoder may be configured to determine a motion vector and a motion vector precision for a current block; identify a current block template within the current picture; search within a search area for a final reference block template that corresponds to the current block template, wherein to search within the search area, the one or more processors are further configured to: identify an initial reference block template based on the motion vector, search other reference block templates around the initial reference block template using a step size that is set to an initial step size, and iteratively reduce the step size from the initial step size until the step size is set to a final step size that equals the motion vector precision; determine a prediction block for the current block based on the final reference block template.

公开(公告)号：US20220167001A1

公开(公告)日：2022-05-26

申请号：US17101687

申请日：2020-11-23

Applicant: QUALCOMM Incorporated

Inventor： Zhi Zhang ,  Chun-Chi Chen ,  Han Huang ,  Vadim Seregin ,  Marta Karczewicz

IPC: H04N19/513 ,  H04N19/70 ,  H04N19/176 ,  H04N19/56

Abstract: A method of decoding video data may comprise decoding data from an encoded bitstream to generate motion vectors and performing a decoder-side motion vector refinement (DMVR) process on one or more of the motion vectors. Performing the DMVR process may include determining one or more characteristics of current video block being decoded and determining a search area for the DMVR process for the current video block based on the determined one or more characteristics of the current video block.