公开(公告)号：US20220345748A1

公开(公告)日：2022-10-27

申请号：US17853153

申请日：2022-06-29

Applicant: Huawei Technologies Co., Ltd.

Inventor： Xiang MA ,  Haitao YANG

IPC: H04N19/70 ,  H04N19/105 ,  H04N19/30 ,  H04N19/186 ,  H04N19/172 ,  H04N19/50

Abstract: A method for decoding a coded video bitstream is provided. The method includes: obtaining a reference layer syntax element by parsing the coded video bitstream, wherein a value of the reference layer syntax element specifying whether a layer with index k is a direct reference layer for a layer with index i; determining whether the layer with index j is a reference layer for the layer with index i based on the value of the reference layer syntax element; and when a condition is satisfied, predicting a picture of the layer with index i based on the layer with index j, wherein the value of a chroma format related syntax element applied to the layer with index i is the same as the value of a chroma format related syntax element applied to the layer with index j.

公开(公告)号：US20220232260A1

公开(公告)日：2022-07-21

申请号：US17714318

申请日：2022-04-06

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Xiang MA ,  Haitao YANG

IPC: H04N19/70 ,  H04N19/31 ,  H04N19/187 ,  H04N19/105 ,  H04N19/159 ,  H04N19/172

Abstract: A method of decoding a coded video bitstream is provided, the method comprising: obtaining, from the coded video bitstream, a first syntax element specifying whether the first layer use inter-layer prediction; obtaining, from the coded video bitstream, one or more second syntax elements related to one or more second layers, each second syntax element specifies whether a second layer is a direct reference layer for the first layer; wherein at least one second syntax element of the one or more second syntax elements has a value specifying a second layer is a direct reference layer for the first layer, in case that the value of the first syntax element specifies the first layer is allowed to use inter-layer prediction; performing inter-layer prediction for a picture of the first layer by using a picture of the second layer related to the at least one second syntax element as a reference picture.

公开(公告)号：US20220078484A1

公开(公告)日：2022-03-10

申请号：US17454896

申请日：2021-11-15

Applicant: Huawei Technologies Co., Ltd.

Inventor： Alexey Konstantinovich FILIPPOV ,  Vasily Alexeevich RUFITSKIY ,  Xiang MA ,  Elena Alexandrovna ALSHINA

IPC: H04N19/593 ,  H04N19/132 ,  H04N19/159 ,  H04N19/176 ,  H04N19/149 ,  H04N19/96 ,  H04N19/186

Abstract: A method for intra prediction of a current chroma block, the method comprising: determining a filter for a luma block collocated with the current chroma block, wherein the determining process is performed based on a partitioning data; obtaining filtered reconstructed luma samples, by applying the determined filter to reconstructed luma samples of a luma block collocated with the current chroma block, and to luma samples in a selected position neighboring to the luma block; obtaining, based on the filtered reconstructed luma samples as an input, linear model parameters; and performing cross-component prediction based on the obtained linear model parameters and the filtered reconstructed luma samples of the luma block, to obtain prediction values of the current chroma block.

公开(公告)号：US20210360275A1

公开(公告)日：2021-11-18

申请号：US17389873

申请日：2021-07-30

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Haitao YANG ,  Fan MU ,  Xiang MA ,  Huanbang CHEN ,  Lian ZHANG

IPC: H04N19/51 ,  H04N19/159 ,  H04N19/132 ,  H04N19/105 ,  H04N19/176

Abstract: The inter prediction method is provided, which includes: obtaining a predicted sample value of a current affine block; determining one or more luminance compensation blocks based on motion vectors of one or more subblocks of the current affine block; determining a linear model coefficient based on a first sample set and a second sample set, where the first sample set includes at least one reconstructed sample neighboring to an edge of the current affine block, the second sample set includes at least one reconstructed sample neighboring to an edge of the one or more luminance compensation blocks, and the sample in the first sample set is in a one-to-one correspondence with the sample in the second sample set; and updating the predicted sample value of the current affine block based on the linear model coefficient, to obtain an updated predicted sample value of the current affine block.

公开(公告)号：US20210314581A1

公开(公告)日：2021-10-07

申请号：US17303976

申请日：2021-06-11

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Xiang MA ,  Jianle CHEN ,  Haitao YANG

IPC: H04N19/196 ,  H04N19/176 ,  H04N19/186 ,  H04N19/132 ,  H04N19/159 ,  H04N19/593

Abstract: This application provides a chroma block prediction method and apparatus. The method includes: obtaining a maximum luma value and a minimum luma value based on luma samples corresponding to neighboring samples of a target chroma block, and calculating a first difference between the maximum luma value and the minimum luma value; if the first difference is not equal to 0, processing the first difference based on a quantity of significant bits of the first difference and a first preset bit depth to obtain a second difference; and determining, based on a first chroma value, a second chroma value, and the second difference, an intra prediction model parameter corresponding to the target chroma block, and determining prediction information of the target chroma block based on the intra prediction model parameter and luma reconstruction information corresponding to the target chroma block.

公开(公告)号：US20210289224A1

公开(公告)日：2021-09-16

申请号：US17337556

申请日：2021-06-03

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Haitao YANG ,  Fan MU ,  Lian ZHANG ,  Xiang MA

IPC: H04N19/51 ,  H04N19/172 ,  H04N19/176 ,  H04N19/184

Abstract: This application provides an inter prediction method and a related apparatus. The method includes: parsing a bitstream to determine prediction information of a to-be-processed picture block, where when the prediction information indicates that a prediction direction of the to-be-processed picture block is bidirectional prediction, the bitstream does not include target identification information, where the target identification information is used to indicate to perform local illumination compensation LIC on the to-be-processed picture block; and obtaining a prediction value of the to-be-processed picture block based on the prediction information. According to the foregoing technical solutions, a video decoding speed can be accelerated without greatly affecting video quality.

公开(公告)号：US20210203975A1

公开(公告)日：2021-07-01

申请号：US17185039

申请日：2021-02-25

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Huanbang CHEN ,  Xiang MA ,  Haitao YANG ,  Jianle CHEN

IPC: H04N19/513 ,  H04N19/105 ,  H04N19/159 ,  H04N19/46 ,  H04N19/176

Abstract: This application provides a video picture prediction method and apparatus, to resolve a problem in a conventional technology that a length of a coded video sequence is increased. The first type of identifier may be added to a bitstream. The first type of identifier is used to indicate whether an affine motion model-based inter prediction mode is enabled for a video picture. For a video picture or a picture block included in the slice for which the affine motion model does not need to be used, a parameter, related to the affine motion model, of the picture block may not need to be transmitted. On a decoder side, during decoding of the picture block, the parameter related to the affine motion model does not need to be parsed. This can reduce load of a decoder, increase a processing speed, and decrease a processing time.