公开(公告)号：US11134273B2

公开(公告)日：2021-09-28

申请号：US16560918

申请日：2019-09-04

Applicant: QUALCOMM Incorporated

Inventor： Marta Karczewicz ,  Muhammed Zeyd Coban ,  Jie Dong

IPC: H04N19/61 ,  H04N19/13 ,  H04N19/176

Abstract: A video decoder can be configured to determine a size of a transform unit, wherein the transform unit comprises N coefficient groups and each coefficient group comprises M coefficients, wherein M and N are integer values; determine a regular bin count threshold for the transform unit based on the size of the transform unit; context decode syntax elements for the transform unit until the first number of regular coded bins is reached; in response to reaching the first number of regular coded bins, bypass decode additional syntax elements of the transform unit; determine values for a first set of coefficients of the transform unit based on the context decoded syntax elements; and determine values for a second set of coefficients of the transform unit based on the additional syntax elements.

公开(公告)号：US20210297685A1

公开(公告)日：2021-09-23

申请号：US17205883

申请日：2021-03-18

Applicant: QUALCOMM Incorporated

Inventor： Marta Karczewicz ,  Alican Nalci ,  Muhammed Zeyd Coban ,  Vadim Seregin

IPC: H04N19/44 ,  H04N19/105 ,  H04N19/189 ,  H04N19/176

Abstract: An example method of decoding video data includes determining that one or more lossy coding tools are enabled at a picture level or slice level for a picture or slice of video data that includes a current block, determining that the current block is decoded with transform skip, bypassing use of the one or more lossy coding tools for the current block based on the determination that the current block is decoded with transform skip, performing a residual coding scheme to generate a residual block, and reconstructing the current block based on the residual block.

公开(公告)号：US20210281832A1

公开(公告)日：2021-09-09

申请号：US17189976

申请日：2021-03-02

Applicant: QUALCOMM Incorporated

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

IPC: H04N19/105 ,  H04N19/169 ,  H04N19/70 ,  H04N19/172 ,  H04N19/196 ,  H04N19/159

Abstract: 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 whether a sequence parameter set of the video data refers to a video parameter set. Based on the sequence parameter set not referring to the video parameter set, the one or more processors are configured to determine a value of a first syntax element to be indicative of a profile-tier-layer structure being signaled in the sequence parameter set and code the video data based on the profile-tier-layer structure.

公开(公告)号：US20210266600A1

公开(公告)日：2021-08-26

申请号：US17181876

申请日：2021-02-22

Applicant: QUALCOMM Incorporated

Inventor： Vadim Seregin ,  Muhammed Zeyd Coban

IPC: H04N19/70 ,  H04N19/105 ,  H04N19/503 ,  H04N19/46 ,  H04N19/176 ,  H04N19/174

Abstract: A video decoder may be configured to receive, in response to receiving a first syntax element indicating that reference picture list information is included in a picture header syntax structure, a second syntax element in the picture header syntax structure indicating whether a collocated picture used for temporal motion vector prediction is to be derived from a first reference picture list or a second reference picture list; receive a slice of the video data that refers to the picture header syntax structure; and in response to the slice being a P slice, set a value for a third syntax element associated with the slice to a first value for the third syntax element, with the first value for the third syntax element indicating that the collocated picture used for temporal motion vector prediction is to be derived from the first reference picture list.

公开(公告)号：US11070812B2

公开(公告)日：2021-07-20

申请号：US16816116

申请日：2020-03-11

Applicant: QUALCOMM Incorporated

Inventor： Muhammed Zeyd Coban ,  Marta Karczewicz

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

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.

公开(公告)号：US20210203934A1

公开(公告)日：2021-07-01

申请号：US17131046

申请日：2020-12-22

Applicant: QUALCOMM Incorporated

Inventor： Marta Karczewicz ,  Hongtao Wang ,  Alican Nalci ,  Muhammed Zeyd Coban

IPC: H04N19/12 ,  H04N19/60 ,  H04N19/176 ,  H04N19/18

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 are configured to determine whether transform skip mode is used for a current block of the video data. The one or more processors are configured to disable level mapping for residual coding based on transform skip mode being used for the current block. The one or more processors are configured to code the current block without applying level mapping.

公开(公告)号：US20210195175A1

公开(公告)日：2021-06-24

申请号：US17128767

申请日：2020-12-21

Applicant: QUALCOMM Incorporated

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

IPC: H04N19/105 ,  H04N19/44 ,  H04N19/30 ,  H04N19/139 ,  H04N19/172

Abstract: A video decoder for decoding multi-layer video data can be configured to maintain a decoded picture buffer (DPB) for storing reference pictures for a plurality of layers, wherein the plurality of layers comprise at least a first layer and a second layer; prior to decoding a current picture of an access unit of the first layer, perform a picture output and removal process on the DPB, wherein to perform the picture output and removal process on the DPB, the one or more processors are further configured to remove from the DPB only decoded pictures that belong to the first layer; and after removing a last decoding unit of the current picture from a coded picture buffer (CPB), perform a picture bumping process across all layers of the DPB.

公开(公告)号：US20210084311A1

公开(公告)日：2021-03-18

申请号：US17017278

申请日：2020-09-10

Applicant: QUALCOMM Incorporated

Inventor： Vadim Seregin ,  Muhammed Zeyd Coban

IPC: H04N19/167 ,  H04N19/176 ,  H04N19/186 ,  H04N19/503 ,  H04N19/31

Abstract: A device is configured to modify, based on chroma phase shifts in a horizontal direction, a horizontal component of a chroma location pointed to by a motion vector of a current block of a current picture. The chroma location is in a reference picture that has a different resolution or a different chroma sampling type from the current picture. The device may modify, based on chroma phase shifts in a vertical direction, a vertical component of the chroma location. Additionally, the device may generate, based on chroma samples of the reference picture corresponding to a modified chroma location chroma samples of a prediction block for a current block of the current picture. The modified chroma location is defined by the modified horizontal and vertical components of the chroma location. The device may code the current block based on the prediction block for the current block.

公开(公告)号：US20200382813A1

公开(公告)日：2020-12-03

申请号：US16886381

申请日：2020-05-28

Applicant: QUALCOMM Incorporated

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

IPC: H04N19/88

Abstract: Techniques for coding coefficients in a residual block are described. A video coder (e.g., video encoder or video decoder) may code (e.g., encode or decode), in an interleaving manner, coefficient information on a coefficient-by-coefficient basis for coefficients in a residual block of a current block of the video data in a first pass, wherein the coefficient information for a coefficient includes one or more of a significance flag indicating whether a value of the coefficient is not zero, a parity flag indicating whether the value of the coefficient is odd or even, a sign flag indicating whether the value of the coefficient is positive or negative, and one or more greater than flags indicating whether an absolute value of the coefficient is greater than respective threshold values, and after the first pass, code remainder information for coefficients in the residual block of the current block in a second pass.

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.