公开(公告)号：US11166033B2

公开(公告)日：2021-11-02

申请号：US16893100

申请日：2020-06-04

Applicant: QUALCOMM Incorporated

Inventor： Vadim Seregin ,  Muhammed Zeyd Coban ,  Adarsh Krishnan Ramasubramonian

IPC: H04N19/169 ,  H04N19/174 ,  H04L29/06 ,  H04N19/70

Abstract: A device is configured to obtain a bitstream that comprises an encoded representation of the video data. Additionally, the device is configured to determine that the bitstream does not satisfy a constraint imposed by a video coding standard based on a layer identifier of an applicable Luma Mapping and Chroma Scaling (LMCS) Adaptation Parameter Set (APS) Network Abstraction Layer (NAL) unit not being equal to a layer identifier of the coded slice NAL unit and not being equal to a layer identifier of any layer that is allowed to be used to predict a layer of the coded slice NAL unit. The applicable LMCS APS NAL unit has an APS identifier specified by a LMCS APS identifier syntax element for the coded slice NAL unit.

公开(公告)号：US11153577B2

公开(公告)日：2021-10-19

申请号：US17066405

申请日：2020-10-08

Applicant: QUALCOMM Incorporated

Inventor： Marta Karczewicz ,  Hongtao Wang ,  Muhammed Zeyd Coban

IPC: H04N19/176 ,  H04N19/184 ,  H04N19/70

Abstract: Embodiments are directed to systems and methods of using a Rice code in video coding. In one embodiment includes a method of encoding or decoding video data, e.g., on a video encoder or decoder. In particular, embodiments are directed to determining a Rice parameter for encoding or decoding syntax elements related to coefficient levels.

公开(公告)号：US20210274204A1

公开(公告)日：2021-09-02

申请号：US17249264

申请日：2021-02-25

Applicant: QUALCOMM Incorporated

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

IPC: H04N19/44 ,  H04N19/70 ,  H04N19/169 ,  H04N19/172

Abstract: In one example, a device for decoding video data includes one or more processors implemented in circuitry and configured to: determine that a value for a syntax element representing a number of profile-tier-level (PTL) data structures in a video parameter set (VPS) of a bitstream is equal to a total number of output layer sets (OLSs) specified for the VPS; in response to determining that the value for the syntax element representing the number of profile-tier-level data structures in the VPS is equal to the total number of OLSs specified for the VPS, infer values for OLS PTL index values, without explicitly decoding values for the OLS PTL index values; and decode video data of one or more OLSs using corresponding PTL data structures of the PTL data structures in the VPS according to the inferred values for the OLS PTL index values.

公开(公告)号：US20210203988A1

公开(公告)日：2021-07-01

申请号：US17131192

申请日：2020-12-22

Applicant: QUALCOMM Incorporated

Inventor： Yao-Jen Chang ,  Vadim Seregin ,  Muhammed Zeyd Coban

IPC: H04N19/597 ,  H04N19/176 ,  H04N19/159 ,  H04N19/52 ,  H04N19/70 ,  H04N19/80

Abstract: A video decoder can be configured to obtain, from a picture parameter set (PPS) data structure of video data, a value for a wraparound offset; in response to determining that a block of the video data is encoded in an inter prediction mode, determine a motion vector for the block and a reference picture for the block; determine a horizontal wrap around position in the reference picture based on the value for the wraparound offset; and determine a prediction block for the block based on the horizontal wrap around position.

公开(公告)号：US20210195248A1

公开(公告)日：2021-06-24

申请号：US17130759

申请日：2020-12-22

Applicant: QUALCOMM Incorporated

Inventor： Muhammed Zeyd Coban ,  Vadim Seregin ,  Adarsh Krishnan Ramasubramonian ,  Marta Karczewicz

IPC: H04N19/70 ,  H04N19/172 ,  H04N19/184 ,  H04N19/169 ,  H04N19/174

Abstract: A method of processing video data comprises obtaining a bitstream and locating intra random access pictures (IRAP) or Gradual Decoder Refresh (GDR) pictures among the encoded pictures in the bitstream. Locating the IRAP or GDR pictures may comprise obtaining, from a picture header Network Abstraction Layer (NAL) unit in the bitstream, a syntax element that indicates that a picture associated with the picture header NAL unit must be either an Intra Random Access Picture (IRAP) or a Gradual Decoder Refresh (GDR) picture. The picture header NAL unit contains syntax elements that apply to all slices of the picture associated with the picture header NAL unit.

公开(公告)号：US20210195222A1

公开(公告)日：2021-06-24

申请号：US17128898

申请日：2020-12-21

Applicant: QUALCOMM Incorporated

Inventor： Hilmi Enes Egilmez ,  Alican Nalci ,  Muhammed Zeyd Coban ,  Marta Karczewicz

IPC: H04N19/186 ,  H04N19/64 ,  H04N19/176

Abstract: An example device includes memory configured to store video data and one or more processors implemented in circuitry and coupled to the memory. The one or more processors determine whether a chroma block of the video data is encoded using dual tree partitioning. The one or more processors determine whether transform skip mode for the chroma block is enabled. The one or more processors, based on the chroma block being encoded using dual tree partitioning and transform skip mode being enabled for the chroma block, infer a value of a low-frequency non-separable transform (LFNST) index for the chroma block.

公开(公告)号：US20210195173A1

公开(公告)日：2021-06-24

申请号：US17125486

申请日：2020-12-17

Applicant: QUALCOMM Incorporated

Inventor： Vadim Seregin ,  Yao-Jen Chang ,  Muhammed Zeyd Coban

IPC: H04N19/105 ,  H04N19/176 ,  H04N19/503

Abstract: A video coder is configured to determine a reference block of a reference picture for prediction of a current block of a current picture using motion information and to generate a set of reference samples for the current block of the current picture. To generate the set of reference samples, the video coder is configured to perform reference sample clipping on the reference block of the reference picture based on a size of the reference picture. The video coder is further configured to generate a prediction block for the current block of the current picture based on the set of reference samples.

公开(公告)号：US20210092455A1

公开(公告)日：2021-03-25

申请号：US17029550

申请日：2020-09-23

Applicant: QUALCOMM Incorporated

Inventor： Yao-Jen Chang ,  Muhammed Zeyd Coban ,  Marta Karczewicz

IPC: H04N19/70 ,  H04N19/96 ,  H04N19/172 ,  H04N19/136 ,  H04N19/176 ,  H04N19/119 ,  H04N19/174

Abstract: A video coder may code, in a picture parameter set (PPS), a syntax element indicative of a luma coding tree block size of coding tree units (CTUs) of a picture of video data to which the PPS is applicable. The video coder may further code the picture of the video data to which the PPS is applicable in accordance with the syntax element in the PPS.

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：US20210037260A1

公开(公告)日：2021-02-04

申请号：US17072381

申请日：2020-10-16

Applicant: QUALCOMM Incorporated

Inventor： Peisong Chen ,  Yunfei Zheng ,  Rajan Laxman Joshi ,  Muhammed Zeyd Coban ,  Marta Karczewicz

IPC: H04N19/60 ,  H04N19/46 ,  H04N19/129 ,  H04N19/176 ,  H04N19/159 ,  H04N19/147 ,  H04N19/122

Abstract: A video encoder may transform residual data by using a transform selected from a group of transforms. The transform is applied to the residual data to create a two-dimensional array of transform coefficients. A scanning mode is selected to scan the transform coefficients in the two-dimensional array into a one-dimensional array of transform coefficients. The combination of transform and scanning mode may be selected from a subset of combinations that is based on an intra-prediction mode. The scanning mode may also be selected based on the transform used to create the two-dimensional array. The transforms and/or scanning modes used may be signaled to a video decoder.