公开(公告)号：US11178399B2

公开(公告)日：2021-11-16

申请号：US16816016

申请日：2020-03-11

Applicant: QUALCOMM Incorporated

Inventor： Jie Dong ,  Amir Said ,  Vadim Seregin ,  Marta Karczewicz

IPC: H04N19/13 ,  H04N19/44 ,  H04N19/124 ,  H04N19/91

Abstract: An example method for entropy decoding of video data includes retrieving a pre-defined initialization value for a context of a plurality of contexts used in a context-adaptive entropy coding process to entropy code a value for a syntax element for an independently codable unit of video data; determining, based on the pre-defined initialization value and in a linear domain, an initial probability state of the context; and entropy decoding, from a bitstream and based on the initial probability state of the context, a bin of the value for the syntax element.

公开(公告)号：US20210314623A1

公开(公告)日：2021-10-07

申请号：US17219147

申请日：2021-03-31

Applicant: QUALCOMM Incorporated

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

IPC: H04N19/70 ,  H04N19/159 ,  H04N19/136

Abstract: A method of processing video data comprises performing a bitstream conformance process that determines whether a bitstream that comprises an encoded representation of the video data conforms to a video coding standard, wherein the bitstream conformance process determines that the bitstream does not conform to the video coding standard when at least one of: a chroma-related constraint flag is equal to 0 and when there are no chroma components for pictures in the bitstream, or an inter prediction-related constraint flag is equal to 0 when all slices of the bitstream are I slices.

公开(公告)号：US11134272B2

公开(公告)日：2021-09-28

申请号：US16020511

申请日：2018-06-27

Applicant: QUALCOMM Incorporated

Inventor： Xin Zhao ,  Vadim Seregin ,  Amir Said ,  Marta Karczewicz

IPC: H04N19/61 ,  H04N19/176 ,  H04N19/50 ,  H04N19/18 ,  H04N19/12 ,  H04N19/42 ,  H04N19/60

Abstract: Techniques are described in which a decoder is configured to receive an input data block and apply an inverse non-separable transform to at least part of the input data block to generate an inverse non-separable transform output coefficient block. The applying the inverse non-separable transform comprises assigning a window, assigning a weight for each position inside the assigned window, and determining the inverse non-separable transform output coefficient block based on the assigned weights. The decoder is further configured to forming a decoded video block based on the determined inverse non-separable transform output coefficient block, wherein forming the decoded video block comprises summing the residual video block with one or more predictive blocks.

公开(公告)号：US11134251B2

公开(公告)日：2021-09-28

申请号：US16800832

申请日：2020-02-25

Applicant: QUALCOMM Incorporated

Inventor： Hongtao Wang ,  Wei-Jung Chien ,  Vadim Seregin ,  Marta Karczewicz

IPC: H04N19/186 ,  H04N19/176 ,  H04N19/182 ,  H04N19/51 ,  H04N19/105 ,  H04N19/117 ,  H04N19/132 ,  H04N19/159 ,  H04N19/86

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 coding unit for chroma components of a block of video data. The one or more processors are configured to split the coding unit for chroma components into a first triangle-shaped partition and a second triangle-shaped partition. The one or more processors are configured to apply pixel blending using a set of weights for a YUV 4:2:0 format to generate a predicted block for the chroma components of the block of video data when the one or more processors generate the coding unit for chroma components in the YUV 4:2:0 format and when the one or more processors generate the coding unit for chroma components in a YUV 4:4:4 format.

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：US11095915B2

公开(公告)日：2021-08-17

申请号：US16776323

申请日：2020-01-29

Applicant: QUALCOMM Incorporated

Inventor： Yu Han ,  Wei-Jung Chien ,  Vadim Seregin ,  Hongtao Wang ,  Marta Karczewicz

IPC: H04N19/51 ,  H04N19/70 ,  H04N19/176

Abstract: An example video coding system may determine a first coding mode for a first block of video data of a plurality of blocks of video data in a processing area. The video coding system may compare a characteristic of the processing area to a threshold. The video coding system may determine whether to enable or disable use of a second coding mode for the remainder of the plurality of blocks of video data in the processing area based on the comparison. The video coding system may code the first block based on the first coding mode and code at least one block of the remainder of the plurality of blocks of video data based on the comparison.

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：US10986340B2

公开(公告)日：2021-04-20

申请号：US16426749

申请日：2019-05-30

Applicant: QUALCOMM Incorporated

Inventor： Hilmi Enes Egilmez ,  Yung-Hsuan Chao ,  Amir Said ,  Vadim Seregin ,  Marta Karczewicz ,  Wei-Jung Chien

IPC: H04N19/12 ,  H04N19/46 ,  H04N19/186 ,  H04N19/176 ,  H04N19/169

Abstract: An example device for decoding video data includes a memory configured to store video data; and a processor implemented in circuitry and configured to decode a truncated unary codeword representing a multiple transform (MT) scheme for a current block of the video data to determine the MT scheme; apply the MT scheme to transform coefficients of the current block to produce residual data for the current block of video data; and decode the current block using the residual data. The MT scheme may include a plurality of transforms, such as a horizontal transform and a vertical transform, a primary transform and a second transform, or any combination of separable and/or non-separable transforms. Thus, a single truncated unary codeword may represent the entire MT scheme, that is, each of a plurality of transforms of the MT scheme.