公开(公告)号：US12273554B2

公开(公告)日：2025-04-08

申请号：US17467794

申请日：2021-09-07

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Sriram Sethuraman ,  Sagar Kotecha ,  Jeeva Raj A ,  Semih Esenlik

IPC: H04N19/52 ,  H04N19/105 ,  H04N19/172 ,  H04N19/176 ,  H04N19/533 ,  H04N19/56 ,  H04N19/567 ,  H04N19/57

Abstract: A method for determining a motion vector to be used in inter-prediction of a current block of a video picture, the method comprising: obtaining an initial motion vector; obtaining at least two groups of points according to the initial motion vector, wherein a first group of the at least two groups of points only includes a first point corresponding to the initial motion vector and additional N points with N≥0 and wherein each point of the first group is closer to the first point than any point of the points of a second group of the at least two groups; and obtaining the motion vector for the current block according to the at least two groups of points and a cost function.

公开(公告)号：US20220368921A9

公开(公告)日：2022-11-17

申请号：US17249771

申请日：2021-03-12

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Sriram SETHURAMAN ,  Jeeva Raj A ,  Sagar KOTECHA

IPC: H04N19/137 ,  H04N19/159 ,  H04N19/105 ,  H04N19/70 ,  H04N19/52 ,  H04N19/176

Abstract: A method for inter-prediction of a current image block in a current picture of a video is provided. The method includes determining whether a first temporal distance (such as TD0) is equal to a second temporal distance (such as TD1), wherein the first temporal distance is represented in terms of a difference between a picture order count value of the current picture and a picture order count value of a first reference image; and the second temporal distance is represented in terms of a difference between a picture order count value of a second reference image and the picture order count value of the current picture; and performing no motion vector refinement (DMVR) procedure when it is determined that the first temporal distance (TD0) is not equal to the second temporal distance (TD1). Thus the DMVR procedure is restricted to only the image block with equal-distance references.

公开(公告)号：US20210392334A1

公开(公告)日：2021-12-16

申请号：US17407617

申请日：2021-08-20

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Semih ESENLIK ,  Sriram SETHURAMAN ,  Jeeva Raj A ,  Sagar KOTECHA

IPC: H04N19/132 ,  H04N19/117 ,  H04N19/82 ,  H04N19/159 ,  H04N19/176

Abstract: It is provided a method of video coding implemented in a decoding device or an encoding device, the method comprising: obtaining initial motion vectors for a current block; obtaining first predictions for a sample value in the current block based on the initial motion vectors; calculating a first matching cost according to the first predictions; determining whether an optical flow refinement process should be performed or not, according to at least one preset condition, the at least one preset condition comprising a condition of whether the calculated first matching cost is equal to or larger than a threshold value; and performing an optical flow refinement process for obtaining a final inter prediction for the sample value in the current block, when it is determined that the optical flow refinement process should be performed.

公开(公告)号：US11985320B2

公开(公告)日：2024-05-14

申请号：US17407617

申请日：2021-08-20

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Semih Esenlik ,  Sriram Sethuraman ,  Jeeva Raj A ,  Sagar Kotecha

IPC: H04N19/132 ,  H04N19/117 ,  H04N19/159 ,  H04N19/176 ,  H04N19/82

CPC classification number: H04N19/132 ,  H04N19/117 ,  H04N19/159 ,  H04N19/176 ,  H04N19/82

Abstract: It is provided a method of video coding implemented in a decoding device or an encoding device, the method comprising: obtaining initial motion vectors for a current block; obtaining first predictions for a sample value in the current block based on the initial motion vectors; calculating a first matching cost according to the first predictions; determining whether an optical flow refinement process should be performed or not, according to at least one preset condition, the at least one preset condition comprising a condition of whether the calculated first matching cost is equal to or larger than a threshold value; and performing an optical flow refinement process for obtaining a final inter prediction for the sample value in the current block, when it is determined that the optical flow refinement process should be performed.

公开(公告)号：US20230188722A1

公开(公告)日：2023-06-15

申请号：US18067458

申请日：2022-12-16

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Sriram Sethuraman ,  Jeeva Raj A ,  Sagar Kotecha

IPC: H04N19/137 ,  H04N19/105 ,  H04N19/159 ,  H04N19/176 ,  H04N19/52 ,  H04N19/70

CPC classification number: H04N19/137 ,  H04N19/105 ,  H04N19/159 ,  H04N19/176 ,  H04N19/52 ,  H04N19/70

Abstract: A method for inter-prediction of a current image block in a current picture of a video is provided. The method includes determining whether a first temporal distance (such as TD0) is equal to a second temporal distance (such as TD1), wherein the first temporal distance is represented in terms of a difference between a picture order count value of the current picture and a picture order count value of a first reference picture; and the second temporal distance is represented in terms of a difference between a picture order count value of a second reference picture and the picture order count value of the current picture; and performing no motion vector refinement (DMVR) procedure when it is determined that the first temporal distance (TD0) is not equal to the second temporal distance (TD1). Thus the DMVR procedure is restricted to only the image block with equal-distance references.

公开(公告)号：US20220116624A1

公开(公告)日：2022-04-14

申请号：US17645608

申请日：2021-12-22

Applicant: Huawei Technologies Co., Ltd.

Inventor： Sriram SETHURAMAN ,  Jeeva Raj A ,  Sagar KOTECHA

IPC: H04N19/137 ,  H04N19/105 ,  H04N19/132 ,  H04N19/159 ,  H04N19/176

Abstract: A method for bi-directional optical flow prediction based on reference sample values from sample positions belonging to an extended region of a predicted block used in the bi-directional optical flow prediction of a current block is provided, wherein sub-pixel positions in the extended region of the predicted block in the reference picture are rounded to obtain integer pixel sample positions in the reference picture, wherein the reference sample values at the obtained integer pixel sample positions in the reference picture are used in the computation of boundary sample gradients corresponding to the boundaries of the predicted block in the reference picture.

公开(公告)号：US11178426B2

公开(公告)日：2021-11-16

申请号：US17103822

申请日：2020-11-24

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Sriram Sethuraman ,  Jeeva Raj A

IPC: H04N19/557 ,  H04N19/513 ,  H04N19/53 ,  H04N19/573 ,  G06T3/40

Abstract: Methods and apparatuses of determining an alignment level between motion compensated reference patches for reducing motion vector refinement steps are provided. According to one method, obtaining, by a decoder, motion compensated interpolated samples based on sub-pixel accurate merge motion vectors from a bilinear motion compensated interpolation; computing, by the decoder, a sum of absolute differences (SAD) between two motion compensated reference patches using a subset of the motion compensated interpolated samples; determining, by the decoder, whether the SAD is less than a coding unit (CU) size-dependent threshold value; when the SAD is less than the CU size-dependent threshold value: skipping remaining decoder-side motion vector refinement (DMVR) process steps; and performing final motion compensation; and when the SAD is not less than the CU size-dependent threshold value: performing the remaining DMVR process steps; and performing the final motion compensation.

公开(公告)号：US11146814B2

公开(公告)日：2021-10-12

申请号：US17103822

申请日：2020-11-24

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Sriram Sethuraman ,  Jeeva Raj A

IPC: H04N19/557 ,  H04N19/513 ,  H04N19/53 ,  H04N19/573 ,  G06T3/40

Abstract: Methods and apparatuses of determining an alignment level between motion compensated reference patches for reducing motion vector refinement steps are provided. According to one method, obtaining, by a decoder, motion compensated interpolated samples based on sub-pixel accurate merge motion vectors from a bilinear motion compensated interpolation; computing, by the decoder, a sum of absolute differences (SAD) between two motion compensated reference patches using a subset of the motion compensated interpolated samples; determining, by the decoder, whether the SAD is less than a coding unit (CU) size-dependent threshold value; when the SAD is less than the CU size-dependent threshold value: skipping remaining decoder-side motion vector refinement (DMVR) process steps; and performing final motion compensation; and when the SAD is not less than the CU size-dependent threshold value: performing the remaining DMVR process steps; and performing the final motion compensation.

公开(公告)号：US20210203946A1

公开(公告)日：2021-07-01

申请号：US17249771

申请日：2021-03-12

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Sriram SETHURAMAN ,  Jeeva Raj A ,  Sagar KOTECHA

IPC: H04N19/137 ,  H04N19/159 ,  H04N19/105 ,  H04N19/70 ,  H04N19/52 ,  H04N19/176

Abstract: A method for inter-prediction of a current image block in a current picture of a video is provided. The method includes determining whether a first temporal distance (such as TD0) is equal to a second temporal distance (such as TD1), wherein the first temporal distance is represented in terms of a difference between a picture order count value of the current picture and a picture order count value of a first reference image; and the second temporal distance is represented in terms of a difference between a picture order count value of a second reference image and the picture order count value of the current picture; and performing no motion vector refinement (DMVR) procedure when it is determined that the first temporal distance (TD0) is not equal to the second temporal distance (TD1). Thus the DMVR procedure is restricted to only the image block with equal-distance references.

公开(公告)号：US12184862B2

公开(公告)日：2024-12-31

申请号：US17645608

申请日：2021-12-22

Applicant: Huawei Technologies Co., Ltd.

Inventor： Sriram Sethuraman ,  Jeeva Raj A ,  Sagar Kotecha

IPC: H04N19/137 ,  H04N19/105 ,  H04N19/132 ,  H04N19/159 ,  H04N19/176

Abstract: A method for bi-directional optical flow prediction based on reference sample values from sample positions belonging to an extended region of a predicted block used in the bi-directional optical flow prediction of a current block is provided, wherein sub-pixel positions in the extended region of the predicted block in the reference picture are rounded to obtain integer pixel sample positions in the reference picture, wherein the reference sample values at the obtained integer pixel sample positions in the reference picture are used in the computation of boundary sample gradients corresponding to the boundaries of the predicted block in the reference picture.