公开(公告)号：US20210329275A1

公开(公告)日：2021-10-21

申请号：US17225643

申请日：2021-04-08

Applicant: QUALCOMM Incorporated

Inventor： Wei-Jung Chien ,  Han Huang ,  Yung-Hsuan Chao ,  Jianle Chen ,  Marta Karczewicz

IPC: H04N19/30 ,  H04N19/70 ,  H04N19/176 ,  H04N19/186

Abstract: An example method includes decoding, from a coded video bitstream, an explicitly defined scaling list; determining, based on values of one or more syntax elements decoded from a sequence parameter set (SPS) of the coded video bitstream, a set of block types to which the explicitly defined scaling list is eligible for application; and applying the explicitly defined scaling list to a block included in the set of block types.

公开(公告)号：US20210203930A1

公开(公告)日：2021-07-01

申请号：US17132836

申请日：2020-12-23

Applicant: QUALCOMM Incorporated

Inventor： Yung-Hsuan Chao ,  Vadim Seregin ,  Marta Karczewicz

IPC: H04N19/119 ,  H04N19/176 ,  H04N19/157 ,  H04N19/70 ,  H04N19/186

Abstract: A method of decoding video data includes determining that a current block of the video data is coded in palette mode, determining, between single tree or dual tree partitioning, that the current block is coded with single tree partitioning enabled, determining that the current block is coded in monochrome format, when the current block is coded with single tree partitioning enabled and when the current block is coded in monochrome format, determining that a number of color components used for palette mode decoding the current block is equal to one, and palette mode decoding the current block based on the determined number of color components used for palette mode decoding the current block being equal to one.

公开(公告)号：US10999594B2

公开(公告)日：2021-05-04

申请号：US16716310

申请日：2019-12-16

Applicant: QUALCOMM Incorporated

Inventor： Cheng-Teh Hsieh ,  Luong Pham Van ,  Vadim Seregin ,  Wei-Jung Chien ,  Yung-Hsuan Chao

IPC: H04N19/513 ,  H04N19/159 ,  H04N19/176 ,  H04N19/423 ,  H04N19/105

Abstract: Systems and techniques for intra-block copy (IBC) prediction in processing video data include the use of one or more virtual search areas (VSAs) which can be generated to include one or more references to one or more pixels stored in a physical memory. The one or more VSAs can provide references to additional reconstructed sample values that are derived from previously decoded blocks without incurring physical memory use for storage of the additional reconstructed samples. A search area for performing the IBC prediction for a current block of the video data can be extended to include the one or more VSAs. Extending the search area to include the one or more VSAs provides the IBC prediction with additional search area for finding one or more prediction blocks or prediction samples without having to utilize physical memory to store the additional reconstructed samples from previously decoded blocks.

公开(公告)号：US20210051332A1

公开(公告)日：2021-02-18

申请号：US16991305

申请日：2020-08-12

Applicant: QUALCOMM Incorporated

Inventor： Marta Karczewicz ,  Yung-Hsuan Chao ,  Muhammed Zeyd Coban ,  Hongtao Wang

IPC: H04N19/157 ,  H04N19/176 ,  H04N19/122 ,  H04N19/124 ,  H04N19/463 ,  H04N19/132

Abstract: A method of decoding video data includes receiving a value indicating that a lossless mode is enabled for a block of the video data and, in response to determining that the value indicates that the lossless mode is enabled for the block of the video data, determining a maximum size for a lossless-coded transform block of the block of the video data is set to a maximum scanning size of the non-lossless coding block. The method further includes inverse scanning residual values for the block of the video data based on the maximum size for the lossless-coded transform block to generate a residual block for the block of the video data and reconstructing the block of the video data based on the residual block.

公开(公告)号：US20210006794A1

公开(公告)日：2021-01-07

申请号：US16917051

申请日：2020-06-30

Applicant: QUALCOMM Incorporated

Inventor： Marta Karczewicz ,  Yung-Hsuan Chao ,  Hongtao Wang ,  Muhammed Zeyd Coban

IPC: H04N19/126 ,  H04N19/70 ,  H04N19/182 ,  H04N19/103 ,  H04N19/60 ,  H04N19/136

Abstract: A video encoder derives a minimum allowed base quantization parameter for video data based on an input bitdepth of the video data, determines a base quantization parameter for a block of the video data based on the minimum allowed base quantization parameter, and quantizes the block of video data based on the base quantization parameter. In a reciprocal fashion, a video decoder derives a minimum allowed base quantization parameter for the video data based on an input bitdepth of the video data, determines a base quantization parameter for a block of the video data based on the minimum allowed base quantization parameter, and inverse quantizes the block of video data based on the base quantization parameter.

公开(公告)号：US20210006792A1

公开(公告)日：2021-01-07

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 ,  H04N19/186 ,  H04N19/463 ,  H04N19/96

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：US10863193B2

公开(公告)日：2020-12-08

申请号：US16455444

申请日：2019-06-27

Applicant: QUALCOMM Incorporated

Inventor： Yung-Hsuan Chao ,  Wei-Jung Chien ,  Marta Karczewicz

IPC: H04N19/52 ,  H04N19/96 ,  H04N19/70 ,  H04N19/176

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: construct a motion vector predictor candidate list for a current block of the video data, the motion vector predictor candidate list identifying one or more blocks that are non-adjacent to the current block, each of the non-adjacent blocks being in a coding tree unit (CTU) including the current block or a line buffer including the current block; select a motion vector predictor from one of the blocks that is non-adjacent to the current block and in the motion vector predictor candidate list; and code motion information of the current block using the motion vector predictor.

公开(公告)号：US20200296390A1

公开(公告)日：2020-09-17

申请号：US16816107

申请日：2020-03-11

Applicant: QUALCOMM Incorporated

Inventor： Yung-Hsuan Chao ,  Muhammed Zeyd Coban ,  Hongtao Wang ,  Marta Karczewicz

IPC: H04N19/186 ,  H04N19/176 ,  H04N19/70 ,  H04N19/50 ,  H04N19/61

Abstract: A video decoder configured to receive a first syntax element indicating if any coding group (CG) of a plurality of CGs includes at least one non-zero coefficient, wherein the plurality of CGs includes a luma CG and at least one chroma CG; in response to the first syntax element indicating that a CG of a plurality of CGs includes at least one non-zero coefficient, receive, for each CG of the plurality of CGs, a flag indicating if a corresponding CG of the plurality of CGs includes at least one non-zero coefficient; and for a CG with a corresponding flag indicating that the CG includes at least one non-zero coefficient, receive additional syntax indicating values for coefficients of the CG.

公开(公告)号：US10708592B2

公开(公告)日：2020-07-07

申请号：US16372180

申请日：2019-04-01

Applicant: QUALCOMM Incorporated

Inventor： Jie Dong ,  Yung-Hsuan Chao ,  Wei-Jung Chien ,  Marta Karczewicz ,  Li Zhang

IPC: H04N19/117 ,  H04N19/176 ,  G06K9/62 ,  H04N19/159

Abstract: Deblocking is a step in video coding for removing distortions that may result from dividing a video frame into blocks, and encoding the video frame based on the blocks. Techniques described herein can include determining the activity in neighboring blocks along the boundary of the blocks, where the activity measures smoothness or complexity of pixels in the boundary area. An average of the activity can then be determined, as well a difference in the activity between the left block and the right block. The average activity and the difference in activity can then be used to determine a classification for the boundary area. The classification can further be used to select a filter to apply to the pixels in the boundary area. Once the filter have been applied, the blocks can be added to a reconstructed video frame.

公开(公告)号：US20190313115A1

公开(公告)日：2019-10-10

申请号：US16379560

申请日：2019-04-09

Applicant: QUALCOMM Incorporated

Inventor： Yung-Hsuan Chao ,  Yu-Chen Sun ,  Wei-Jung Chien ,  Yi-Wen Chen ,  Marta Karczewicz

IPC: H04N19/513 ,  H04N19/44 ,  H04N19/176 ,  H04N19/70

Abstract: A method of decoding video data comprising performing a prediction process for one or more neighboring blocks of video data that are neighboring a current block of video data to obtain prediction pixel values for neighboring pixels of the current block of video data, deriving a template for the current block of video data using the prediction pixel values, performing a decoder-side motion vector derivation technique using the derived template to derive a motion vector for the current block of video data, and decoding the current block of video data using the derived motion vector.