公开(公告)号：US12244805B2

公开(公告)日：2025-03-04

申请号：US16997321

申请日：2020-08-19

Applicant: QUALCOMM Incorporated

Inventor： Adarsh Krishnan Ramasubramonian ,  Geert Van der Auwera ,  Wei-Jung Chien ,  Han Huang ,  Yu Han ,  Bappaditya Ray ,  Marta Karczewicz

IPC: H04N19/124 ,  H04N19/176 ,  H04N19/186 ,  H04N19/44

Abstract: Techniques are described for decoding video data. A video decoder may determine chroma blocks in a chroma quantization group (QG) of the video data, determine a quantization parameter predictor that is the same for each of the chroma blocks of the chroma QG, determine an offset value that is the same for two or more of the chroma blocks of the chroma QG, determine a quantization parameter value for each of the two or more of the chroma blocks in the chroma QG based on the quantization parameter predictor and the offset value inverse quantize coefficients of one or more residual blocks for the chroma blocks based on the determined quantization parameter value, generate the one or more residual blocks based on the inverse quantized coefficients, and reconstruct the chroma blocks based on the one or more residual blocks.

公开(公告)号：US11418787B2

公开(公告)日：2022-08-16

申请号：US16912232

申请日：2020-06-25

Applicant: QUALCOMM Incorporated

Inventor： Yu Han ,  Geert Van der Auwera ,  Muhammed Zeyd Coban ,  Wei-Jung Chien ,  Yung-Hsuan Chao ,  Alican Nalci ,  Marta Karczewicz

IPC: H04N19/186 ,  H04N19/124 ,  H04N19/176 ,  H04N19/169 ,  H04N19/70

Abstract: A video decoder can be configured to determine a predicted luma quantization parameter (QP) for a luma component of a coding unit; receive, in the bitstream of encoded video data, first syntax indicating a luma delta QP value for the luma component; determine a QP value for the luma component based on the predicted luma QP and the luma delta QP value; determine a predicted chroma QP for a chroma component of the coding unit; receive, in the bitstream of encoded video data, second syntax indicating a chroma delta QP value for the chroma component of the coding unit; and determine a QP value for the chroma component of the coding unit based on the predicted chroma QP and the chroma delta QP value.

公开(公告)号：US11381819B2

公开(公告)日：2022-07-05

申请号：US16918741

申请日：2020-07-01

Applicant: QUALCOMM Incorporated

Inventor： Yu Han ,  Geert Van der Auwera ,  Muhammed Zeyd Coban ,  Wei-Jung Chien ,  Yung-Hsuan Chao ,  Alican Nalci ,  Marta Karczewicz

IPC: H04N19/124 ,  H04N19/176 ,  H04N19/96 ,  H04N19/463 ,  H04N19/186

Abstract: Examples of block-level signaling of quantization parameter offsets is described. Such block-level signaling of quantization parameter offsets provides block level flexibility to determine a more precise chroma quantization parameter (QP) for a chroma block. With the block-level quantization parameter offset signaling described in this disclosure, there is more flexibility in defining the chroma QP, resulting in more accurate determination of chroma QP on a chroma block-by-chroma block basis.

公开(公告)号：US20200296360A1

公开(公告)日：2020-09-17

申请号：US16816147

申请日：2020-03-11

Applicant: QUALCOMM Incorporated

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

IPC: H04N19/107 ,  H04N19/176 ,  H04N19/115

Abstract: An example video coding system may determine that a first block of video data in a processing area is coded using a first prediction mode. The example video coding system may determine whether a characteristic of the processing area meets a criterion. The example coding system may, in response to determining that the characteristic of the processing area meets the criterion, determine, based at least in part on the first prediction mode used to code the first block of video data in the processing area, whether to use a second prediction mode to code a current block of video data in the processing area. The example coding system may, in response to determining not to use the second prediction mode to code the current block of video data, code the current block of video data using a default prediction mode.

公开(公告)号：US20200213586A1

公开(公告)日：2020-07-02

申请号：US16730708

申请日：2019-12-30

Applicant: QUALCOMM Incorporated

Inventor： Yu Han ,  Wei-Jung Chien ,  Chun-Chi Chen ,  Vadim Seregin ,  Marta Karczewicz

IPC: H04N19/115 ,  H04N19/176 ,  H04N19/96 ,  H04N19/119

Abstract: A device for processing video data includes a memory configured to store video data and one or more processors implemented in circuitry. The one or more processors are configured to generate a first weighting factor for a first reference picture in a first picture list using a second weighting factor for a second reference picture in a second picture list. The one or more processors are further configured to generate prediction information for a current block of video data using the first weighting factor and the second weighting factor.

公开(公告)号：US20200053379A1

公开(公告)日：2020-02-13

申请号：US16530181

申请日：2019-08-02

Applicant: QUALCOMM Incorporated

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

IPC: H04N19/52 ,  H04N19/61 ,  H04N19/176

Abstract: A video coder is configured to perform motion vector prediction to predict a motion vector for a block of video data. The motion vector prediction may use a motion vector predictor list that includes both adjacent and non-adjacent candidates relative to the current block. The video coder may divide spatial motion vector prediction candidates for a current block of video data into groups, add the spatial motion vector prediction candidates to a motion vector predictor list based on the groups, and decode a motion vector for the current block of video data based on the motion vector predictor list.

公开(公告)号：US20240107023A1

公开(公告)日：2024-03-28

申请号：US17934508

申请日：2022-09-22

Applicant: QUALCOMM Incorporated

Inventor： Yu Han ,  Vladan Andrijanic ,  Wei-Jung Chien ,  Cheng-Teh Hsieh ,  Marta Karczewicz

IPC: H04N19/132 ,  H04N19/105 ,  H04N19/139 ,  H04N19/156 ,  H04N19/167 ,  H04N19/172 ,  H04N19/176 ,  H04N19/436 ,  H04N19/52

CPC classification number: H04N19/132 ,  H04N19/105 ,  H04N19/139 ,  H04N19/156 ,  H04N19/167 ,  H04N19/172 ,  H04N19/176 ,  H04N19/436 ,  H04N19/52

Abstract: A method of encoding video data includes determining an integer sample in a reference picture of the video data; determining, based on the integer sample, at least a first fractional sample and a second fractional sample, wherein the first fractional sample has a first fractional pel resolution, and the second fractional sample has a second fractional pel resolution different from the first fractional pel resolution; subsequent to determining both the first fractional sample and the second fractional sample, determining a first cost metric associated with the first fractional sample and a second cost metric associated with the second fractional sample; determining a reference block for a current block based on at least one of the first cost metric or the second cost metric; and encoding the current block based on the reference block.

公开(公告)号：US11388398B2

公开(公告)日：2022-07-12

申请号：US16772424

申请日：2018-01-11

Applicant: QUALCOMM Incorporated

Inventor： Yu Han ,  Kai Zhang ,  Wei-Jung Chien ,  Marta Karczewicz

IPC: H04N19/107 ,  H04N19/176 ,  H04N19/503 ,  H04N19/593

Abstract: A video coding device includes a memory configured to store video data, and processing circuitry in communication with the memory. The processing circuitry is configured to determine that a current block of the video data stored to the memory is to be coded according to a merge mode, and to determine a temporal candidate associated with a merge candidate list for the current block in accordance with the merge mode. The processing circuitry is further configured to determine a pool of spatial candidates associated with the merge candidate list, based on each spatial candidate of the pool having a same reference picture as the temporal candidate, and to set a local illumination compensation (LIC) flag value for the temporal candidate based on respective LIC flag values of one or more spatial candidates of the pool.

公开(公告)号：US11064192B2

公开(公告)日：2021-07-13

申请号：US16592005

申请日：2019-10-03

Applicant: QUALCOMM Incorporated

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

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

Abstract: A device and method for coding video data determines a spatial-temporal motion vector predictor (STMVP) so that the STMVP does not need to be motion vector scaled. The device may determine a candidate list. The device may then determine which candidates in the candidate list have the same reference picture. The device may then generate the STMVP based on the candidates in the candidate list determined to have the same reference picture. The device may then code a current block of video data using the STMVP.

公开(公告)号：US11051034B2

公开(公告)日：2021-06-29

申请号：US16593388

申请日：2019-10-04

Applicant: QUALCOMM Incorporated

Inventor： Yu Han ,  Wei-Jung Chien ,  Han Huang ,  Chao-Hsiung Hung ,  Marta Karczewicz

IPC: H04N7/12 ,  H04N19/52 ,  H04N19/176 ,  H04N19/56 ,  H04N19/132 ,  H04N19/105 ,  H04N19/159 ,  H04N19/172

Abstract: Systems and techniques for processing video data include a history-based motion vector predictor (HMVP) table with two or more HMVP candidates, where a first entry of the HMVP table associated with a first index value includes a first HMVP candidate and a second entry of the HMVP table associated with a second index value includes a second HMVP candidate, the first index value being lower than the second index value. For an advanced motion vector prediction (AMVP) candidate list, one or more HMVP candidates from the HMVP table are selected in a reverse order, where the second HMVP candidate is selected before the first HMVP candidate according to the reverse order. The selected one or more HMVP candidates are added to the AMVP candidate list. The AMVP candidate list can be used to perform AMVP for the one or more blocks of video data.