公开(公告)号：US20210314625A1

公开(公告)日：2021-10-07

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 ,  H04N19/46 ,  H04N19/176 ,  H04N19/174

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：US20210314579A1

公开(公告)日：2021-10-07

申请号：US17218898

申请日：2021-03-31

Applicant: QUALCOMM Incorporated

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

IPC: H04N19/186 ,  H04N19/70 ,  H04N19/176 ,  H04N19/103 ,  H04N19/50 ,  H04N19/82

Abstract: A method of coding video data includes determining that chroma related syntax elements of the video data are present for luma mapping with chroma scaling (LMCS) for a coding unit (CU) of the video data, coding a syntax element of the video data when the chroma related syntax elements are present for LMCS for the CU, the syntax element is indicative of a value for determining a scaling parameter for chroma scaling in LMCS, and coding a chroma block of the CU based on the scaling parameter for chroma scaling.

公开(公告)号：US11128876B2

公开(公告)日：2021-09-21

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 ,  H04N19/61 ,  H04N19/50 ,  H04N19/70

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：US20210289219A1

公开(公告)日：2021-09-16

申请号：US17196444

申请日：2021-03-09

Applicant: QUALCOMM Incorporated

Inventor： Vadim Seregin ,  Yong He ,  Muhammed Zeyd Coban

IPC: H04N19/44 ,  H04N19/187

Abstract: A video decoder may be configured to output layers of video data according to layers specified in an output layer set mode as well as based on the actual layers received in an access unit. Accordingly, the video coder may be configured to output layers actually received rather than restart a video bitstream in situations where the layers actually received do not match the layers specified in the output layer set mode. In another example, a video encoder may disable inter prediction when the sub-picture ID of a sub-picture in a currently coded picture does not match the sub-picture ID of a sub-picture in a reference picture.

公开(公告)号：US11095916B2

公开(公告)日：2021-08-17

申请号：US16934483

申请日：2020-07-21

Applicant: QUALCOMM Incorporated

Inventor： Vadim Seregin ,  Muhammed Zeyd Coban

IPC: H04N19/51 ,  H04N19/44 ,  H04N19/70 ,  H04N19/176

Abstract: Parameters used to perform wraparound motion compensation are available in a common parameter set. A video encoder may signal and a video decoder may parse a syntax element in a picture parameter set (PPS) indicative of an offset used for wraparound motion compensation for a current block of the video data.

公开(公告)号：US20210235124A1

公开(公告)日：2021-07-29

申请号：US17159508

申请日：2021-01-27

Applicant: QUALCOMM Incorporated

Inventor： Vadim Seregin ,  Muhammed Zeyd Coban

IPC: H04N19/70 ,  H04N19/184 ,  H04N19/44 ,  H04N19/146

Abstract: An example method includes decoding, when a sequence parameter set (SPS) of a current bitstream of video data is referred to by a layer that is an only layer of an output layer set (OLS), a decoded picture buffer (DPB) parameters syntax structure from the SPS; and reconstructing, based on the DPB parameters syntax structure, video data represented by the current bitstream.

公开(公告)号：US20210195192A1

公开(公告)日：2021-06-24

申请号：US17125159

申请日：2020-12-17

Applicant: QUALCOMM Incorporated

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

IPC: H04N19/12 ,  H04N19/176 ,  H04N19/18 ,  H04N19/70 ,  H04N19/60

Abstract: A video coder may determine, for a transform block of video data, that at least one coefficient group, of the transform block, that comprises a non-zero transform coefficient is outside of a lowest frequency region of the transform block, wherein the at least one coefficient group is one of a plurality of coefficient groups that each comprise transform coefficients. The video coder may determine not to code a syntax element indicative of a multiple transform selection (MTS) for the transform block based at least in part on the determination of that the at least one coefficient group is outside of the lowest frequency region of the transform block. The video coder may code the video data based at least in part on the determination not to code the syntax element indicative of the multiple transform selection for the transform block.

公开(公告)号：US20210195179A1

公开(公告)日：2021-06-24

申请号：US17126914

申请日：2020-12-18

Applicant: QUALCOMM Incorporated

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

IPC: H04N19/107 ,  H04N19/70 ,  H04N19/503 ,  H04N19/593 ,  H04N19/186 ,  H04N19/176 ,  H04N19/172

Abstract: An example method of processing video data includes parsing at least one of a first flag of the video data, in a picture header, indicative of whether a set of inter slice syntax elements are included in the picture header, and a second flag of the video data, in the picture header, indicative of whether a set of intra slice syntax elements are included in the picture header, selectively parsing at least one of the set of inter slice syntax elements, in the picture header, based on the first flag and the set of intra slice syntax elements, in the picture header, based on the second flag, and reconstructing the picture based on at least one of the set of inter slice syntax elements and the set of intra slice syntax elements.

公开(公告)号：US11032572B2

公开(公告)日：2021-06-08

申请号：US15931271

申请日：2020-05-13

Applicant: QUALCOMM Incorporated

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

IPC: H04N19/61 ,  H04N19/176 ,  H04N19/44 ,  H04N19/70 ,  H04N19/50

Abstract: A video decoder is configured to determine a position of a last significant coefficient in a transform block of video data. The video decoder may then determine a value of a low-frequency non-separable transform (LFNST) index for the transform block based on the position of the last significant coefficient relative to a zero-out region of the transform block, wherein the zero-out region of the transform block includes both a first region within an LFNST region of the transform block and a second region of the transform block outside the LFNST region. The video decoder may then inverse transform the transform block in accordance with the value of the LFNST index.

公开(公告)号：US20210092449A1

公开(公告)日：2021-03-25

申请号：US17022253

申请日：2020-09-16

Applicant: QUALCOMM Incorporated

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

IPC: H04N19/70 ,  H04N19/172

Abstract: An example device includes a memory and one or more processors implemented in circuitry and communicatively coupled to the memory. The one or more processors are configured to determine a value of a first syntax element indicative of a number of subpictures in a picture of video data. The one or more processors are configured to determine, for each subpicture among the subpictures in the picture, a value of a respective second syntax element indicative of an identification of a respective subpicture. The one or more processors are also configured to code the respective subpicture identified by the respective second syntax element.