公开(公告)号：US11695960B2

公开(公告)日：2023-07-04

申请号：US16899063

申请日：2020-06-11

Applicant: QUALCOMM Incorporated

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

IPC: H04N19/645 ,  H04N19/18 ,  H04N19/124 ,  H04N19/70 ,  H04N19/186 ,  H04N19/176

CPC classification number: H04N19/645 ,  H04N19/124 ,  H04N19/176 ,  H04N19/18 ,  H04N19/186 ,  H04N19/70

Abstract: A video decoder determines, based on a block size of a current block and a low-frequency non-separable transform (LFNST) syntax element, a zero-out pattern of normatively defined zero-coefficients. The LFNST syntax element is signaled at a transform unit (TU) level. Additionally, the video decoder determines transform coefficients of the current block. The transform coefficients of the current block include transform coefficients in an LFNST region of the current block and transform coefficients outside the LFNST region of the current block. As part of determining the transform coefficients of the current block, the video decoder applies an inverse LFNST to determine values of one or more transform coefficients in the LFNST region of the current block. The video decoder also determines that transform coefficients of the current block in a region of the current block defined by the zero-out pattern are equal to 0.

公开(公告)号：US11659201B2

公开(公告)日：2023-05-23

申请号：US16990910

申请日：2020-08-11

Applicant: QUALCOMM Incorporated

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

IPC: H04N19/59 ,  H04N19/184 ,  H04N19/172

CPC classification number: H04N19/59 ,  H04N19/172 ,  H04N19/184

Abstract: Systems, methods, and computer-readable storage media for calculating scaling ratios are described. An example method can include obtaining a current picture of video data and one or more scaling windows associated with the current picture and/or a reference picture selected for use in coding the current picture; determining a first size of the current picture and/or a second size of the reference picture, the first size including a first height and a first width and the second size including a second height and a second width; based on the one or more scaling windows and the first size and/or the second size, determining one or more scaling ratios associated with the current picture and/or the reference picture.

公开(公告)号：US11638036B2

公开(公告)日：2023-04-25

申请号：US17220829

申请日：2021-04-01

Applicant: QUALCOMM Incorporated

Inventor： Alican Nalci ,  Marta Karczewicz ,  Muhammed Zeyd Coban

IPC: H04N19/70 ,  H04N19/124 ,  H04N19/174 ,  H04N19/176 ,  H04N19/46

Abstract: An example device includes memory and one or more processors implemented in circuitry and communicatively coupled to the memory. The one or more processors are configured to receive a first slice header syntax element for a slice of the video data and determine a first value for the first slice header syntax element, the first value being indicative of whether dependent quantization is enabled. The one or more processors are configured to receive a second slice header syntax element for the slice of the video data and determine a second value for the second slice header syntax element, the second value being indicative of whether sign data hiding is enabled. The one or more processors are configured to determine whether transform skip residual coding is disabled for the slice based on the first value and the second value and decode the slice based on the determinations.

公开(公告)号：US11632540B2

公开(公告)日：2023-04-18

申请号：US17119758

申请日：2020-12-11

Applicant: QUALCOMM Incorporated

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

IPC: H04N19/105 ,  H04N19/132 ,  H04N19/30 ,  H04N19/70 ,  H04N19/176

Abstract: A video encoder and video decoder may be configured to disable subpicture processing in situations where reference picture scaling is enabled. In another example, when reference picture scaling is enabled, a video encoder may determine a reference picture scaling ratio for the reference picture resampling process based on a width of a scaling window (PicOutputWidthL) of the current picture and a height of the scaling window (PicOutputHeightL) of the current picture. The values of PicOutputWidthL and PicOutputHeightL are constrained, respectively, relative to a width of a scaling window (refPicOutputWidthL) of the reference picture and a height of the scaling window (refPicOutputHeightL) of the reference picture.

公开(公告)号：US11496771B2

公开(公告)日：2022-11-08

申请号：US17181876

申请日：2021-02-22

Applicant: QUALCOMM Incorporated

Inventor： Vadim Seregin ,  Muhammed Zeyd Coban

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

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：US20220329819A1

公开(公告)日：2022-10-13

申请号：US17658385

申请日：2022-04-07

Applicant: QUALCOMM Incorporated

Inventor： Louis Joseph Kerofsky ,  Muhammed Zeyd Coban ,  Bappaditya Ray ,  Hilmi Enes Egilmez ,  Marta Karczewicz

IPC: H04N19/136 ,  H04N19/159 ,  H04N19/18 ,  H04N19/176

Abstract: A method of decoding video data includes determining an intra prediction mode from a plurality of intra prediction modes for a current block of the video data, determining a low frequency non-separable transform (LFNST) kernel from a plurality of LFNST kernels for the current block based on the determined intra prediction mode, wherein at least one LFNST kernel of the plurality of LFNST kernels is associated with at least two different intra prediction modes of the plurality of intra prediction modes, applying an inverse of the determined LFNST kernel to coefficient values generated from a transform unit (TU) of the current block to generate intermediate values, applying an inverse primary transform on the intermediate values to generate residual data, and reconstructing the current block based on the residual data.

公开(公告)号：US11457229B2

公开(公告)日：2022-09-27

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 ,  H04N19/176 ,  H04N19/64

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：US11381867B2

公开(公告)日：2022-07-05

申请号：US16736610

申请日：2020-01-07

Applicant: QUALCOMM Incorporated

Inventor： Thomas Stockhammer ,  Muhammed Zeyd Coban ,  Zhen Liu

IPC: H04N7/173 ,  H04N21/43 ,  H04N21/4405 ,  G06F9/54 ,  H04N19/70 ,  H04N21/439

Abstract: An example client device for retrieving media data includes a memory configured to store media data; and one or more processors implemented in circuitry and configured to execute a plurality of video decoders; determine a complexity value for the media data including a plurality of encoded video streams, the complexity value representing complexity of an aggregation of the encoded video streams; retrieve the media data including the encoded video streams in response to determining that the client device is capable of decoding the encoded video streams using the complexity value; and distribute the encoded video streams and synchronization information to corresponding video decoders of the plurality of video decoders to cause the video decoders to decode the corresponding video streams and to output decoded video data from the video streams in a synchronized fashion.

公开(公告)号：US11356685B2

公开(公告)日：2022-06-07

申请号：US17027262

申请日：2020-09-21

Applicant: QUALCOMM Incorporated

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

IPC: H04N19/44 ,  H04N19/70 ,  H04N19/132 ,  H04N19/423 ,  H04N19/186 ,  H04N19/176

Abstract: A video decoder can be configured to decode a first syntax element indicating a size of a coding tree unit (CTU); after decoding the first syntax element indicating the size of the CTU, decode a second syntax element indicating a width of elements of a subpicture identifier grid; after decoding the first syntax element indicating the size of the CTU, decode a third syntax element indicating a height of the elements of the subpicture identifier grid; and determine a location of a subpicture within a picture based on the first syntax element, the second syntax element, and the third syntax element.

公开(公告)号：US11330305B2

公开(公告)日：2022-05-10

申请号：US17182583

申请日：2021-02-23

Applicant: QUALCOMM Incorporated

Inventor： Vadim Seregin ,  Muhammed Zeyd Coban

IPC: H04N19/70 ,  H04N19/174 ,  H04N19/159 ,  H04N19/46

Abstract: An example device includes memory configured to store 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 picture of the video data is an intra random access picture (IRAP) and determine whether all layers of the picture are independent. Based on the picture being an IRAP and all layers of the picture being independent, the one or more processors are configured to determine a value of a first syntax element to be indicative of an inter slice not being allowed in the picture and code the picture without using inter slice prediction.