公开(公告)号：US10856003B2

公开(公告)日：2020-12-01

申请号：US16148738

申请日：2018-10-01

Applicant: QUALCOMM Incorporated

Inventor： Kai Zhang ,  Jianle Chen ,  Xiang Li ,  Wei-Jung Chien ,  Yi-Wen Chen ,  Li Zhang ,  Marta Karczewicz

IPC: H04B1/66 ,  H04N7/12 ,  H04N11/02 ,  H04N11/04 ,  H04N19/52 ,  H04N19/176 ,  H04N19/54 ,  H04N19/137 ,  H04N19/105

Abstract: An example device for coding video data includes a memory configured to store video data, and one or more processors implemented in circuitry and configured to code a first motion vector difference (MVD) representing a difference between a first motion vector of a current block of video data predicted using affine prediction and a first motion vector predictor (MVP) for the first motion vector, predict a second MVD from the first MVD for a second motion vector of the current block, and code the current block using affine prediction according to the first motion vector and the second motion vector. Predicting the second MVD from the first MVD in this may reduce bitrate of a bitstream including coded video data, as well as improve processing efficiency.

公开(公告)号：US20200374550A1

公开(公告)日：2020-11-26

申请号：US16858046

申请日：2020-04-24

Applicant: QUALCOMM Incorporated

Inventor： Han Huang ,  Wei-Jung Chien ,  Marta Karczewicz

IPC: H04N19/577 ,  H04N19/176 ,  H04N19/159 ,  H04N19/169

Abstract: A video coder is configured to code a block of video data using bi-prediction with bi-directional optical flow. The video coder may determine an offset using bi-directional optical flow and may add the offset to prediction samples determined from the bi-prediction. In one example, the video coder code a current block of video data using bi-prediction and bi-directional optical flow, wherein the bi-directional flow does not include one or more of a rounding operation or a division by 2 in an offset calculation. Additionally, the video coder may perform a motion vector refinement calculation for the bi-directional flow, wherein the motion vector refinement calculation is compensated to account for the offset calculation not including the division by 2.

公开(公告)号：US20200344494A1

公开(公告)日：2020-10-29

申请号：US16853232

申请日：2020-04-20

Applicant: QUALCOMM Incorporated

Inventor： Nan Hu ,  Vadim Seregin ,  Marta Karczewicz ,  Muhammed Zeyd Coban

IPC: H04N19/80 ,  H04N19/70 ,  H04N19/96

Abstract: Examples for performing adaptive loop filtering in video coding are described. A video decoder may determine that a number of parameter sets, which each include one or more adaptive filters for adaptive loop filtering, that a current coding structure of the video data refers to for adaptive loop filtering is equal to zero. Based on the number of the parameter sets that the current coding structure refers to for adaptive loop filtering being equal to zero, the video decoder may determine which fixed filter from a set of fixed filters to use for adaptive loop filtering without receiving a syntax element that indicates whether one of the set of fixed filters is to be used for adaptive loop filtering. The video decoder may perform adaptive loop filtering on the current block based on the fixed filter from the set of fixed filters.

公开(公告)号：US10812798B2

公开(公告)日：2020-10-20

申请号：US16156894

申请日：2018-10-10

Applicant: QUALCOMM Incorporated

Inventor： Wei-Jung Chien ,  Kai Zhang ,  Yi-Wen Chen ,  Marta Karczewicz

IPC: H04N19/124 ,  H04N19/196 ,  H04N19/42 ,  H04N19/70 ,  H04N19/157 ,  H04N19/103 ,  H04N19/174 ,  H04N19/186

Abstract: Provided are systems, methods, and computer-readable medium for encoding and decoding video data. In various examples, a coding device can include multiple luma QP and chroma QP relationship tables. In performing quantization or inverse quantization one video data being encoded or decoded, respectively, the coding device can select a table. The table can be selected based on, for example, a slice type, a prediction mode, and/or a luminance value, among other factors. The coding device can then use the luma QP value to look up a chroma QP value from the table. The luma QP and chroma QP values can then be used in quantization or inverse quantization.

公开(公告)号：US10812791B2

公开(公告)日：2020-10-20

申请号：US15701711

申请日：2017-09-12

Applicant: QUALCOMM Incorporated

Inventor： Wei-Jung Chien ,  Yi-Wen Chen ,  Li Zhang ,  Marta Karczewicz

IPC: H04N19/105 ,  H04N19/70 ,  H04N19/52 ,  H04N19/139 ,  H04N19/44 ,  H04N19/513

Abstract: In one example, a method includes receiving, in a coded video bitstream and for a current prediction unit (PU) of a current picture of video data, a representation of an offset vector that identifies a block of a reference picture, wherein the offset vector is within a set of values that are not uniformly distributed. The example method further includes determining, based on the block of the reference picture identified by the offset vector, motion information for the current PU. The example method further includes reconstructing the current PU based on the determined motion information.

公开(公告)号：US20200322636A1

公开(公告)日：2020-10-08

申请号：US16838553

申请日：2020-04-02

Applicant: QUALCOMM Incorporated

Inventor： Hilmi Enes Egilmez ,  Vadim Seregin ,  Amir Said ,  Marta Karczewicz

IPC: H04N19/625 ,  H04N19/176 ,  H04N19/61

Abstract: An example device for coding video data includes a memory configured to store video data; and one or more processors implemented in circuitry and configured to: code a first codeword representing a selected transform scheme of a set of transform candidates of a multiple transform selection (MTS) scheme for a current block of video data, the selected transform scheme being a secondary transform of a set of available secondary transforms to be applied in addition to a primary transform; code a second codeword representing the secondary transform from the set of available secondary transforms; and apply the primary transform and the secondary transform during coding of residual data for the current block. The second codeword may be a value for a low-frequency non-separable transform (LFNST) syntax element.

公开(公告)号：US20200314424A1

公开(公告)日：2020-10-01

申请号：US16822990

申请日：2020-03-18

Applicant: QUALCOMM Incorporated

Inventor： Nan Hu ,  Vadim Seregin ,  Marta Karczewicz

IPC: H04N19/117 ,  H04N19/176 ,  H04N19/70 ,  H04N19/186

Abstract: A method of decoding video data including decoding, from a video bitstream for which adaptive loop filtering is enabled for luma blocks of one or more of a picture, a slice, a tile, or a tile group, a first syntax element indicating a number of adaptive parameter sets for the luma blocks, decoding a plurality of first adaptive parameter set indices for the luma blocks based on the number of adaptive parameter sets for the luma blocks, and decoding, from the video bitstream for which adaptive loop filtering is enabled for chroma blocks of the one or more of the picture, the slice, the tile, or the tile group, a second adaptive parameter set index for the chroma blocks.

公开(公告)号：US20200314419A1

公开(公告)日：2020-10-01

申请号：US16829626

申请日：2020-03-25

Applicant: QUALCOMM Incorporated

Inventor： Hongtao Wang ,  Han Huang ,  Yu Han ,  Geert Van der Auwera ,  Wei-Jung Chien ,  Marta Karczewicz

IPC: H04N19/11 ,  H04N19/139 ,  H04N19/132 ,  H04N19/159 ,  H04N19/70 ,  H04N19/186 ,  H04N19/176

Abstract: A video coder selects a set of wide-angle intra prediction directions based on a size of a luma block of a picture having a YUV 4:2:2 chroma sampling format. Additionally, the video coder determines an intra prediction direction for the luma block. The intra prediction direction for the luma block is in the set of wide-angle intra prediction directions. The video coder also determines an intra prediction direction for a chroma block. The luma block is collocated in the picture with the chroma block. The chroma block has a different width/height ratio than the luma block. The intra prediction direction for the chroma block is guaranteed to have the intra prediction direction for the luma block. The video coder uses the intra prediction directions for the luma and chroma blocks to generate prediction blocks for the luma and chroma blocks, respectively.

公开(公告)号：US20200296420A1

公开(公告)日：2020-09-17

申请号：US16814654

申请日：2020-03-10

Applicant: QUALCOMM Incorporated

Inventor： Marta Karczewicz ,  Muhammed Zeyd Coban ,  Hongtao Wang

IPC: H04N19/61 ,  H04N19/70 ,  H04N19/176

Abstract: A device for decoding video data determines, for a residual block of video data encoded using a transform skip mode, a value for a first neighboring coefficient of a coefficient currently being decoded; determines a value for a second neighboring coefficient of the coefficient currently being decoded; determines a context offset for the coefficient currently being decoded based on the value for the first neighboring coefficient and the value for the second neighboring coefficient; and decodes a value for the coefficient currently being decoded based on the determined context offset.

公开(公告)号：US20200296381A1

公开(公告)日：2020-09-17

申请号：US16816116

申请日：2020-03-11

Applicant: QUALCOMM Incorporated

Inventor： Muhammed Zeyd Coban ,  Marta Karczewicz

IPC: H04N19/132 ,  H04N19/105 ,  H04N19/70 ,  H04N19/159 ,  H04N19/176

Abstract: A video decoder may determine, based on syntax elements in a bitstream that comprises an encoded representation of the video data, residual quantized samples of a block of the video data. Additionally, the video decoder may determine quantized residual values based on the residual quantized samples. After determining the quantized residual values, the video decoder may inverse quantize the quantized residual values. The video decoder may generate predicted values by performing intra prediction for the block using unfiltered samples from above or left block boundary samples. Furthermore, the video decoder may reconstruct original sample values of the block based on the inverse-quantized quantized residual values and the prediction values.