公开(公告)号：US20240185470A1

公开(公告)日：2024-06-06

申请号：US18488816

申请日：2023-10-17

Applicant: QUALCOMM Incorporated

Inventor： Adarsh Krishnan Ramasubramonian ,  Geert Van der Auwera ,  Marta Karczewicz

IPC: G06T9/00

CPC classification number: G06T9/001

Abstract: A device for processing point cloud data is configured to determine a first attribute value for a first point of a point cloud, the first point being a closest already-decoded point to a current point of the point cloud; determine second and third attribute values for second and third points of the point cloud, the second and third points being second and third closest already-decoded points; determine a fourth attribute value for a fourth point of the point cloud, the fourth point being an already-decoded point that is either further from, or the same distance to, the current point as the third point; generate a set of predictor candidates with a subset of the first attribute value, the second attribute value, the third attribute value, and the fourth attribute value based on a comparison of a location of the second point to a location of the third point.

公开(公告)号：US12002244B2

公开(公告)日：2024-06-04

申请号：US17224984

申请日：2021-04-07

Applicant: QUALCOMM Incorporated

Inventor： Adarsh Krishnan Ramasubramonian ,  Bappaditya Ray ,  Geert Van der Auwera ,  Louis Joseph Kerofsky ,  Marta Karczewicz

IPC: G06T9/00 ,  G06T3/40 ,  G06T9/40

CPC classification number: G06T9/001 ,  G06T3/40 ,  G06T9/40

Abstract: An example device for decoding point cloud data includes: a memory configured to store point cloud data; and one or more processors implemented in circuitry and configured to: decode a frame of the point cloud data including a plurality of points, each of the points being associated with position values defining a respective position of the point; determine a global scaling factor for the frame; and scale the position values of each of the points by the global scaling factor. The scaling may be clipped to prevent the points exceeding the boundaries of a corresponding bounding box including respective points.

公开(公告)号：US11949909B2

公开(公告)日：2024-04-02

申请号：US17558362

申请日：2021-12-21

Applicant: QUALCOMM Incorporated

Inventor： Luong Pham Van ,  Adarsh Krishnan Ramasubramonian ,  Bappaditya Ray ,  Geert Van der Auwera ,  Marta Karczewicz

IPC: H04N19/527 ,  H04N19/124 ,  H04N19/139 ,  H04N19/177 ,  H04N19/597

CPC classification number: H04N19/527 ,  H04N19/124 ,  H04N19/139 ,  H04N19/177 ,  H04N19/597

Abstract: An example device for coding point cloud data includes a memory configured to store data representing points of a point cloud, and one or more processors implemented in circuitry and configured to: determine height values of points in a point cloud; classify the points into a set of ground points or a set of object points according to the height values; and code the ground points and the object points according to the classifications. The one or more processors may determine top and bottom thresholds and classify the ground and object points according to the top and bottom thresholds. The one or more processors may further code a data structure, such as a geometry parameter set (GPS), including data representing the top and bottom thresholds.

公开(公告)号：US11803989B2

公开(公告)日：2023-10-31

申请号：US17143696

申请日：2021-01-07

Applicant: QUALCOMM Incorporated

Inventor： Adarsh Krishnan Ramasubramonian ,  Bappaditya Ray ,  Geert Van der Auwera ,  Marta Karczewicz

IPC: G06T9/40 ,  G06T7/73

CPC classification number: G06T9/40 ,  G06T7/73 ,  G06T2207/10028

Abstract: A method of decoding a point cloud comprises: reconstructing a position of a point of the point cloud; determining a quantized attribute value for the point; deriving a quantization parameter (QP) bit depth offset for the point; deriving a QP range for the point based on the QP bit depth offset for the point; determining a quantization step size for the point based on the QP range for the point; and inverse quantizing the quantized attribute value for the point based on the quantization step size for the point.

公开(公告)号：US20230342987A1

公开(公告)日：2023-10-26

申请号：US18300023

申请日：2023-04-13

Applicant: QUALCOMM Incorporated

Inventor： Luong Pham Van ,  Geert Van der Auwera ,  Adarsh Krishnan Ramasubramonian ,  Marta Karczewicz

IPC: G06T9/40

CPC classification number: G06T9/40

Abstract: A G-PCC coder may determine an occupancy of a reference child node in a reference node, wherein the reference node is in a reference frame of point cloud data used for inter prediction of a current node in a current frame of the point cloud data. The G-PCC coder may further determine a context for decoding a current occupancy bit of a current child node of the current node based on the occupancy of the reference child node, and arithmetic decode the current occupancy bit using the context.

公开(公告)号：US11770562B2

公开(公告)日：2023-09-26

申请号：US17354674

申请日：2021-06-22

Applicant: QUALCOMM Incorporated

Inventor： Bappaditya Ray ,  Adarsh Krishnan Ramasubramonian ,  Geert Van der Auwera ,  Marta Karczewicz

IPC: H04N19/70 ,  H04N19/157 ,  H04N19/184

CPC classification number: H04N19/70 ,  H04N19/157 ,  H04N19/184

Abstract: An apparatus configured for point cloud compression may be configured to code a first syntax element indicating a number of bits used to encode one or more second syntax elements, wherein the one or more second syntax elements indicate one or more of an offset of a bounding box, an origin point of the bounding box, a size of the bounding box, or a number of unique segments. The apparatus may code the first syntax element using an exponential Golomb code. The apparatus may further code the one or more second syntax elements using a fixed length code based on the number of bits indicated by the first syntax element, and code the point cloud based on the decoded one or more second syntax elements.

公开(公告)号：US20230262214A1

公开(公告)日：2023-08-17

申请号：US18306078

申请日：2023-04-24

Applicant: QUALCOMM Incorporated

Inventor： Bappaditya Ray ,  Geert Van der Auwera ,  Vadim Seregin ,  Marta Karczewicz

IPC: H04N19/11 ,  H04N19/159 ,  H04N19/176 ,  H04N19/105 ,  H04N19/186 ,  H04N19/132

CPC classification number: H04N19/11 ,  H04N19/159 ,  H04N19/176 ,  H04N19/105 ,  H04N19/186 ,  H04N19/132

Abstract: An example device for decoding video data includes a memory configured to store video data; and one or more processors implemented in circuitry and configured to: generate an intra-prediction block for a current block of video data using an angular intra-prediction mode, the angular intra-prediction mode being an upper-right angular intra-prediction mode or a lower-left angular intra-prediction mode; determine a prediction direction of the angular intra-prediction mode; for at least one sample of the intra-prediction block for the current block: calculate a gradient term for the at least one sample along the prediction direction; and combine a value of an intra-predicted sample of the intra-prediction block at a position of the at least one sample of the intra-prediction block with the gradient term to produce a value of the at least one sample of the intra-prediction block; and decode the current block using the intra-prediction block.

公开(公告)号：US11671595B2

公开(公告)日：2023-06-06

申请号：US16813508

申请日：2020-03-09

Applicant: QUALCOMM Incorporated

Inventor： Luong Pham Van ,  Geert Van der Auwera ,  Adarsh Krishnan Ramasubramonian ,  Han Huang ,  Marta Karczewicz

IPC: H04N19/119 ,  H04N19/176 ,  H04N19/186 ,  H04N19/96

CPC classification number: H04N19/119 ,  H04N19/176 ,  H04N19/186 ,  H04N19/96

Abstract: A method of decoding video data includes determining, by one or more processors implemented in circuitry, a partition of the video data into a plurality of blocks. The partition of the video data applies a block size restriction to prevent a splitting of a block of the plurality of blocks that would result in a small block comprising a block width and a block height when the block height times the block width is less than a threshold. The method further includes generating, by the one or more processors, prediction information for the block and determining, by the one or more processors, a predicted block for the block based on the prediction information. The method further includes decoding, by the one or more processors, a residual block for the block and combining, by the one or more processors, the predicted block and the residual block to decode the block.

公开(公告)号：US11671592B2

公开(公告)日：2023-06-06

申请号：US17115455

申请日：2020-12-08

Applicant: QUALCOMM Incorporated

Inventor： Bappaditya Ray ,  Geert Van der Auwera ,  Vadim Seregin ,  Marta Karczewicz

IPC: H04N19/11 ,  H04N19/159 ,  H04N19/132 ,  H04N19/105 ,  H04N19/186 ,  H04N19/176

CPC classification number: H04N19/11 ,  H04N19/105 ,  H04N19/132 ,  H04N19/159 ,  H04N19/176 ,  H04N19/186

Abstract: An example device for decoding video data includes a memory configured to store video data; and one or more processors implemented in circuitry and configured to: generate an intra-prediction block for a current block of video data using an angular intra-prediction mode, the angular intra-prediction mode being an upper-right angular intra-prediction mode or a lower-left angular intra-prediction mode; determine a prediction direction of the angular intra-prediction mode; for at least one sample of the intra-prediction block for the current block: calculate a gradient term for the at least one sample along the prediction direction; and combine a value of an intra-predicted sample of the intra-prediction block at a position of the at least one sample of the intra-prediction block with the gradient term to produce a value of the at least one sample of the intra-prediction block; and decode the current block using the intra-prediction block.

公开(公告)号：US20230162406A1

公开(公告)日：2023-05-25

申请号：US18158135

申请日：2023-01-23

Applicant: QUALCOMM Incorporated

Inventor： Adarsh Krishnan Ramasubramonian ,  Bappaditya Ray ,  Geert Van der Auwera ,  Louis Joseph Kerofsky ,  Marta Karczewicz

IPC: G06T9/00 ,  G06T15/30 ,  H04N19/124

CPC classification number: G06T9/001 ,  G06T15/30 ,  H04N19/124 ,  G06T9/00

Abstract: In some examples, a method of decoding a point cloud includes decoding an initial QP value from an attribute parameter set. The method also includes determining a first QP value for a first component of an attribute of point cloud data from the initial QP value. The method further includes determining a QP offset value for a second component of the attribute of the point cloud data and determining a second QP value for the second component of the attribute from the first QP value and from the QP offset value. The method includes decoding the point cloud data based on the first QP value and further based on the second QP value.