公开(公告)号：US20200288126A1

公开(公告)日：2020-09-10

申请号：US16809250

申请日：2020-03-04

Applicant: QUALCOMM Incorporated

Inventor： Nan Hu ,  Vadim Seregin ,  Marta Karczewicz

IPC: H04N19/117 ,  H04N19/30 ,  H04N19/176 ,  H04N19/186 ,  H04N19/159

Abstract: An example device for decoding video data includes a memory configured to store video data; and one or more processors implemented in circuitry and configured to: calculate an average value of a subset of pixels of a luminance block of the video data, without using pixels of the luminance block that are not included in the subset; decode chrominance transform coefficients for a chrominance residual block of a chrominance block of the video data, the chrominance block corresponding to the luminance block; inverse transform the chrominance transform coefficients to produce chrominance residual values of the chrominance residual block; determine a scaling value using the average value; scale the chrominance residual values using the scaling value; and decode the chrominance block using the scaled chrominance residual values of the chrominance residual block.

公开(公告)号：US10547854B2

公开(公告)日：2020-01-28

申请号：US15590261

申请日：2017-05-09

Applicant: QUALCOMM Incorporated

Inventor： Vadim Seregin ,  Xin Zhao ,  Amir Said ,  Marta Karczewicz ,  Nan Hu ,  Wei-Jung Chien ,  Vijayaraghavan Thirumalai

IPC: H04N19/159 ,  H04N5/926 ,  H04N19/593 ,  H04N1/417 ,  H04N9/804 ,  H04N9/808

Abstract: A device for coding video data is configured to determine that a current block of video data is coded using an intra prediction mode; add an intra prediction mode of a first neighboring block of the current block to a most probable mode candidate list for the current block; add an intra prediction mode for a second neighboring block of the current block to the most probable mode candidate list for the current block; add an intra prediction mode for a third neighboring block of the current block to the most probable mode candidate list for the current block; and code the current block of video data using an intra prediction mode.

公开(公告)号：US20180063531A1

公开(公告)日：2018-03-01

申请号：US15685738

申请日：2017-08-24

Applicant: QUALCOMM Incorporated

Inventor： Nan Hu ,  Jianle Chen ,  Vadim Seregin ,  Marta Karczewicz

IPC: H04N19/124 ,  H04N19/132 ,  H04N19/176 ,  H04N19/48 ,  H04N19/587 ,  H04N19/61

CPC classification number: H04N19/124 ,  H04N19/132 ,  H04N19/176 ,  H04N19/186 ,  H04N19/42 ,  H04N19/48 ,  H04N19/577 ,  H04N19/587 ,  H04N19/61

Abstract: A device for coding video data can be configured to perform a parameter derivation operation to determine one or more first parameters for a first block of video data; performing the parameter derivation operation to determine one or more second parameters for a second block of video data that is coded in a different coding mode than the first block of video data; code the first block of video data based on the one or more first parameters; and code the second block of video data based on the one or more second parameters.

公开(公告)号：US12200207B2

公开(公告)日：2025-01-14

申请号：US17853274

申请日：2022-06-29

Applicant: QUALCOMM Incorporated

Inventor： Nan Hu ,  Vadim Seregin ,  Marta Karczewicz

IPC: H04N19/117 ,  H04N19/105 ,  H04N19/159 ,  H04N19/176 ,  H04N19/70 ,  H04N19/82

Abstract: A video decoder is configured to determine, for a current block of video data, a classifier from a plurality of available classifiers for the current block, wherein each classifier of the plurality of available classifiers defines a process for calculating a class index; determine a class index based on the classifier and one or more sample values of the current block; select a filter from a set of filters based on the class index; and apply the filter to the current block.

公开(公告)号：US11736688B2

公开(公告)日：2023-08-22

申请号：US16905502

申请日：2020-06-18

Applicant: QUALCOMM Incorporated

Inventor： Nan Hu ,  Hilmi Enes Egilmez ,  Vadim Seregin ,  Marta Karczewicz

IPC: H04N19/117 ,  H04N19/46 ,  H03M7/30 ,  H03M7/40 ,  H04N19/176

CPC classification number: H04N19/117 ,  H03M7/4075 ,  H03M7/6011 ,  H04N19/176 ,  H04N19/46

Abstract: Example techniques are described for coding video data by obtaining a block of video data, obtaining an adaptive parameter set, determining a set of adaptive loop filter parameters for a plurality of filters for the block of video data based on the adaptive parameter set, wherein a plurality of adaptive loop parameters of the set of adaptive loop filter parameters are signaled using the same signaling parameter for each of the plurality of filters of the adaptive parameter set, and coding the block of video data using the set of adaptive loop filter parameters. The example techniques can be performed as part of an encoding or decoding process and/or by an encoder or a decoder.

公开(公告)号：US11601657B2

公开(公告)日：2023-03-07

申请号：US17218898

申请日：2021-03-31

Applicant: QUALCOMM Incorporated

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

IPC: H04N19/186 ,  H04N19/70 ,  H04N19/103 ,  H04N19/82 ,  H04N19/50 ,  H04N19/176

Abstract: A method of coding video data includes determining that chroma related syntax elements of the video data are present for luma mapping with chroma scaling (LMCS) for a coding unit (CU) of the video data, coding a syntax element of the video data when the chroma related syntax elements are present for LMCS for the CU, the syntax element is indicative of a value for determining a scaling parameter for chroma scaling in LMCS, and coding a chroma block of the CU based on the scaling parameter for chroma scaling.

公开(公告)号：US20230010869A1

公开(公告)日：2023-01-12

申请号：US17853274

申请日：2022-06-29

Applicant: QUALCOMM Incorporated

Inventor： Nan Hu ,  Vadim Seregin ,  Marta Karczewicz

IPC: H04N19/117 ,  H04N19/176 ,  H04N19/70 ,  H04N19/105 ,  H04N19/159 ,  H04N19/82

Abstract: A video decoder is configured to determine, for a current block of video data, a classifier from a plurality of available classifiers for the current block, wherein each classifier of the plurality of available classifiers defines a process for calculating a class index; determine a class index based on the classifier and one or more sample values of the current block; select a filter from a set of filters based on the class index; and apply the filter to the current block.

公开(公告)号：US11431968B2

公开(公告)日：2022-08-30

申请号：US16670759

申请日：2019-10-31

Applicant: QUALCOMM Incorporated

Inventor： Vadim Seregin ,  Nan Hu ,  Wei-Jung Chien ,  Marta Karczewicz ,  Xin Zhao ,  Vijayaraghavan Thirumalai

IPC: H04N19/00 ,  H04N19/11 ,  H04N19/157 ,  H04N19/463 ,  H04N19/159 ,  H04N19/176 ,  H04N19/593 ,  H04N19/10 ,  H04N19/103 ,  H04N19/105 ,  H04N19/112 ,  H04N19/122 ,  H04N19/129 ,  H04N19/149 ,  H04N19/167 ,  H04N19/169 ,  H04N19/182

Abstract: A video coder determines a first block of the video data is intra mode coded; based on a first height and the first width of the first block, identifies a group of N available intra prediction modes for the first block of video data; selects from the group of N available intra prediction modes, a first intra prediction mode used to code the first block of the video data; and codes the first block using the first intra prediction mode. A video coder generates a first most probable mode (MPM) candidate list for the block; codes a first flag indicating an actual intra prediction mode used to code the block is not included in the first MPM candidate list; generates a second MPM candidate list by deriving at least one candidate intra prediction mode based on an intra prediction mode in the first MPM candidate list.

公开(公告)号：US11425422B2

公开(公告)日：2022-08-23

申请号：US17318775

申请日：2021-05-12

Applicant: QUALCOMM Incorporated

Inventor： Yong He ,  Vadim Seregin ,  Muhammed Zeyd Coban ,  Yao-Jen Chang ,  Marta Karczewicz ,  Nan Hu

IPC: H04B1/66 ,  H04N7/12 ,  H04N11/02 ,  H04N11/04 ,  H04N19/70 ,  H04N19/172 ,  H04N19/184

Abstract: Example methods and devices for coding video data are disclosed. An example device for coding video data includes memory configured to store the video data, and one or more processors implemented in circuitry and communicatively coupled to the memory. The one or more processors are configured to determine a value of a first syntax element indicative of whether a first constraint is applicable, the first constraint being that rectangular slices are not used for a plurality of pictures. The one or more processors are also configured to decode the plurality of pictures of the video data in accordance with the value of the first syntax element.

公开(公告)号：US20220201292A1

公开(公告)日：2022-06-23

申请号：US17557706

申请日：2021-12-21

Applicant: QUALCOMM Incorporated

Inventor： Marta Karczewicz ,  Nan Hu ,  Vadim Seregin

IPC: H04N19/117 ,  H04N19/132 ,  H04N19/176 ,  H04N19/70 ,  H04N19/14 ,  H04N19/124 ,  H04N19/159

Abstract: A video decoder can be configured to apply a first stage adaptive loop filter (ALF) to a reconstructed sample by determining a first class index for the reconstructed sample, selecting a filter from a first set of filters based on the first class index, and applying the filter from the first set of filters to the reconstructed sample to determine a first intermediate sample value; apply a second stage ALF to the reconstructed sample by determining a second class index for the reconstructed sample; select a second filter from a second set of filters based on the second class index, applying the second filter to the reconstructed sample to determine a first sample modification value, and determining a second sample modification value based on the first intermediate sample value; and determine a filtered reconstructed sample based on the reconstructed sample and the first and second sample modification values.