公开(公告)号：US20220070462A1

公开(公告)日：2022-03-03

申请号：US17509324

申请日：2021-10-25

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Sergey Yurievich IKONIN ,  Roman Igorevich CHERNYAK ,  Timofey Mikhailovich SOLOVYEV ,  Alexander Alexandrovich KARABUTOV ,  Jianle CHEN ,  Elena Alexandrovna ALSHINA

IPC: H04N19/126 ,  H04N19/132 ,  H04N19/44 ,  H04N19/186

Abstract: A method of obtaining a chrominance quantization parameter (QP) for chrominance components based on a luminance QP for luminance component, wherein the method is performed by a decoder, comprising parsing a received bitstream to obtain the luminance QP and information of a mapping function (ƒ) which associates a QP index (QPi) to the chrominance QP (QPc); obtaining the QPi based at least in a part on the luminance QP; obtaining the mapping function based on the obtained information; and obtaining a QPc based on the obtained mapping function and the obtained QPi.

公开(公告)号：US20220007020A1

公开(公告)日：2022-01-06

申请号：US17447340

申请日：2021-09-10

Applicant: Huawei Technologies Co., Ltd.

Inventor： Biao WANG ,  Semih ESENLIK ,  Anand Meher KOTRA ,  Han GAO ,  Jianle CHEN

IPC: H04N19/119 ,  H04N19/159 ,  H04N19/176

Abstract: The present disclosure provides a method of video coding implemented in a decoding device or an encoding device, the method comprising: determining a block size of a current coding block, the current coding block being coded in intra prediction mode; selecting, based on the determined block size of the current coding block, a sub-partitioning rule that determines a number of sub-partitions and a partition direction into which the current coding block is to be divided; and dividing the current coding block into sub-partitions based on the selected sub-partitioning rule.

公开(公告)号：US20210400304A1

公开(公告)日：2021-12-23

申请号：US17446849

申请日：2021-09-03

Applicant: Huawei Technologies Co., Ltd.

Inventor： Han GAO ,  Semih ESENLIK ,  Biao WANG ,  Anand Meher KOTRA ,  Jianle CHEN

IPC: H04N19/593 ,  H04N19/176 ,  H04N19/132 ,  H04N19/105 ,  H04N19/186 ,  H04N19/184 ,  H04N19/159

Abstract: The present disclosure provides a method of video coding implemented by a decoding device or an encoding device for optimum usage of a hardware reference memory buffer, wherein a group of reference coding tree units (CTUs) for Intra Block Copy (IBC) mode prediction of a current block of a current CTU is determined based on a size of the current CTU, and wherein the reference samples of the current block are obtained from the group of reference CTUs.

公开(公告)号：US20210352304A1

公开(公告)日：2021-11-11

申请号：US17368502

申请日：2021-07-06

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Roman Igorevich CHERNYAK ,  Yin ZHAO ,  Sergey Yurievich IKONIN ,  Jianle CHEN

IPC: H04N19/186 ,  H04N19/176 ,  H04N19/70 ,  H04N19/60 ,  H04N19/44

Abstract: A method of coding implemented by a decoding device or encoding device, the method comprising obtaining a bitstream, the bitstream comprises a transform unit syntax; the syntax comprises at least two cbf flags for chroma blocks (in an example, transform unit syntax correspond to either transform unit or sub-transform units which include two chroma cbf flags: tu_cbf_cb and tu_cbf_cb—one flag for each chroma plane), a chroma cbf flag specifies whether certain block has residue in correspondent color plane; deriving a value of a luma cbf flag tu_cbf_luma based on one or any combination of a value of a cu_cbf flag, values of two chroma cbf flags corresponding to a current transform unit or sub-transform unit, location of the sub-transform unit within transform unit, values of luma and chroma cbf flags correspondent to previous sub-transform units in the current transform unit.

公开(公告)号：US20210344931A1

公开(公告)日：2021-11-04

申请号：US17360224

申请日：2021-06-28

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Alexey Konstantinovich FILIPPOV ,  Vasily Alexeevich RUFITSKIY ,  Jianle CHEN

IPC: H04N19/159 ,  H04N19/11 ,  H04N19/186 ,  H04N19/132 ,  H04N19/176

Abstract: An intra prediction method is described. The method can include determining a prediction value for a sample of a current block from one or more reference samples outside the current block by using an intra predication mode. The method can also include deriving a weighted prediction value, when one or more predefined conditions are not satisfied, wherein the one or more predefined conditions relate to at least one of a width and/or a height of the current block and the intra prediction mode. Furthermore, the method can include coding the current block using the weighted prediction value, when the one or more predefined conditions are not satisfied.

公开(公告)号：US20210337238A1

公开(公告)日：2021-10-28

申请号：US17351957

申请日：2021-06-18

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Alexey Konstantinovich FILIPPOV ,  Vasily Alexeevich RUFITSKIY ,  Jianle CHEN

IPC: H04N19/82 ,  H04N19/105 ,  H04N19/50

Abstract: The present disclosure relates to intra- or inter-prediction for video encoding and decoding. For that purpose, an apparatus and methods obtain a reference sample and a subpixel offset value. A 4-tap interpolation filter is used to filter the reference sample to obtain a predicted sample value. The filter coefficients c0, c1, c2, and c3 of the 4-tap interpolation filter satisfy c 0 = 16 - p 2 , c 1 = 16 + 16 - p 2 , c 2 = 16 + p 2 , and ⁢ ⁢ c 3 = p 2 , with p being a fractional part of the value of the subpixel offset.

公开(公告)号：US20210321113A1

公开(公告)日：2021-10-14

申请号：US17358572

申请日：2021-06-25

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Maxim Borisovitch SYCHEV ,  Timofey Mikhailovich SOLOVYEV ,  Alexander Alexandrovich KARABUTOV ,  Sergey Yurievich IKONIN ,  Jianle CHEN

IPC: H04N19/137 ,  H04N19/159 ,  H04N19/503 ,  H04N19/46 ,  H04N19/176

Abstract: The disclosure provides a motion vector compression method, comprising: obtaining a temporal motion vector; determining a compressed motion vector using a binary representation of the temporal motion vector comprising an exponent part and/or a mantissa part, wherein the exponent part comprises N bits, the mantissa part comprises M bits, and wherein N is a non-negative integer and M is a positive integer; and performing a temporal motion vector prediction (TMVP) using the compressed motion vector.

公开(公告)号：US20210289222A1

公开(公告)日：2021-09-16

申请号：US17333351

申请日：2021-05-28

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Biao WANG ,  Semih ESENLIK ,  Jianle CHEN ,  Anand Meher KOTRA ,  Han GAO

IPC: H04N19/50 ,  H04N19/159 ,  H04N19/46 ,  H04N19/70 ,  H04N19/176

Abstract: The present disclosure relates to the field of picture processing. Especially, the disclosure deals with improving the prediction of a block of a picture when decoding or encoding. A method of coding a block of a picture, comprising: obtaining an indication parameter for a current coding block. The indication parameter represents whether a multi-hypothesis prediction is applied to the current coding block. When the indication parameter represents that the multi-hypothesis prediction is applied to the current coding block, coding the current coding block according to a planar mode.

公开(公告)号：US20210289203A1

公开(公告)日：2021-09-16

申请号：US17336712

申请日：2021-06-02

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Yin ZHAO ,  Haitao YANG ,  Jianle CHEN

IPC: H04N19/122 ,  H04N19/176 ,  H04N19/18 ,  H04N19/61 ,  H04N19/119

Abstract: A video decoding method includes parsing a bitstream to obtain a split mode to transform units (TUs) in a current coding unit (CU). Each of the TUs has a serial number in a one-to-one correspondence with positions of the TUs in the current CU. A transform coefficient of a luminance transform block of a current TU in the TUs is obtained. A transform type of the luminance transform block of the current TU is obtained based on the split mode and a serial number of the current TU. An inverse transform on the transform coefficient of the luminance transform block of the current TU is performed based on the transform type of the luminance transform block of the current TU to obtain a reconstructed residual of the luminance transform block of the current TU. A reconstructed block of the current CU is obtained based on the reconstructed residual.

公开(公告)号：US20210281835A1

公开(公告)日：2021-09-09

申请号：US17328352

申请日：2021-05-24

Applicant: Huawei Technologies Co., Ltd.

Inventor： Alexey Konstantinovich FILIPPOV ,  Vasily Alexeevich RUFITSKIY ,  Jianle CHEN

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

Abstract: The present disclosure provides methods and devices of intra predicting a block of a picture. The method comprises for a sample of the block: obtaining a predicted sample value from one or more reference sample values by performing intra-prediction using a DC intra-prediction mode; multiplying the predicted sample value by a sample weighting factor to produce a weighted predicted sample value; adding an additional value to the weighted predicted sample value to produce a non-normalized predicted sample value; and normalizing the non-normalized predicted sample value by an arithmetic right shift; wherein the sample weighting factor is ((2