公开(公告)号：US11277616B2

公开(公告)日：2022-03-15

申请号：US16905352

申请日：2020-06-18

Applicant: QUALCOMM Incorporated

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

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

Abstract: The disclosure describes examples for determining samples to use for DC intra mode prediction, such as where the samples are in a row or column that is not immediately above or immediately left of the current block. The samples may be aligned with the current block such that a last sample in the samples in a row above the current block is in same column as last column of the current block and such that a last sample in the samples in a column left of the current block is in the same row as the last row of the current block.

公开(公告)号：US20210407143A1

公开(公告)日：2021-12-30

申请号：US17350603

申请日：2021-06-17

Applicant: QUALCOMM Incorporated

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

IPC: G06T9/00 ,  G06T17/20 ,  G01S17/89

Abstract: A device for encoding point cloud data, the device comprising: a memory to store the point cloud data; and one or more processors coupled to the memory and implemented in circuitry, the one or more processors configured to: determine a horizontal plane position of a node, wherein the horizontal plane position indicates a position of a single plane that is perpendicular to a first axis of a coordinate system, wherein the first axis is a horizontal axis; determine, from a plurality of contexts consisting of 8 contexts, a context for the horizontal plane position of the node; and perform arithmetic encoding on a syntax element indicating the horizontal plane position using the determined context.

公开(公告)号：US11197005B2

公开(公告)日：2021-12-07

申请号：US16678041

申请日：2019-11-08

Applicant: QUALCOMM Incorporated

Inventor： Adarsh Krishnan Ramasubramonian ,  Geert Van der Auwera ,  Cheng-Teh Hsieh ,  Marta Karczewicz

IPC: H04N19/186 ,  H04N19/159 ,  H04N19/176 ,  H04N19/124

Abstract: A video coder determines a boundary luma value and derives a chroma value that corresponds to the boundary luma value. The video coder may derive a first prediction model and a second prediction model based on the derived chroma value. The video coder may use the first prediction model to determine a first set of predicted chroma samples of a prediction block for the current block. The first set of predicted chroma samples corresponds to the luma samples of the prediction block that have values less than or equal to the boundary luma value. The video coder may use the second prediction model to determine a second set of predicted chroma samples of the prediction block. The second set of predicted chroma samples corresponds to the luma samples of the prediction block that have values greater than the boundary luma value.

公开(公告)号：US11190758B2

公开(公告)日：2021-11-30

申请号：US16854720

申请日：2020-04-21

Applicant: QUALCOMM Incorporated

Inventor： Muhammed Zeyd Coban ,  Geert Van der Auwera ,  Marta Karczewicz

IPC: H04N19/105 ,  H04N19/159 ,  H04N19/46 ,  H04N19/186 ,  H04N19/176

Abstract: Techniques are described for improving video coding. For example, a first block of a picture included in an encoded video bitstream can be obtained. A second block of the picture can be determined as being coded (e.g., encoded) using a type of block-based quantized residual domain pulse code modulation (BDPCM) mode, such as vertical BDPCM mode or horizontal BDPCM mode. In the event the second block is coded using the vertical BDPCM mode, a vertical intra-prediction mode can be determined for an intra-prediction mode list for the first block. The vertical intra-prediction mode can be added to the intra-prediction mode list for the first block. In the event the second block is coded using the horizontal BDPCM mode, a horizontal intra-prediction mode can be determined for the intra-prediction mode list for the first block and the horizontal intra-prediction mode can be added to the intra-prediction mode list.

公开(公告)号：US20210329298A1

公开(公告)日：2021-10-21

申请号：US17224877

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: H04N19/597 ,  H04N19/174 ,  H04N19/124 ,  H04N19/186 ,  H04N19/70

Abstract: In some examples, a method of decoding a point cloud includes determining a first slice QP value for a first component of an attribute in a slice of point cloud data. The method also includes decoding a first delta QP value for the first component of the attribute for a region in the slice and determining a first region QP value for the first component of the attribute in the region from the first slice QP value and from the first delta QP value. The method further includes decoding a second delta QP value for the second component of the attribute for the region and determining a second region QP value for the second component of the attribute in the region from the second delta QP value. The method includes decoding the point cloud data based on the first and second region QP values.

公开(公告)号：US11153576B2

公开(公告)日：2021-10-19

申请号：US17024551

申请日：2020-09-17

Applicant: QUALCOMM Incorporated

Inventor： Adarsh Krishnan Ramasubramonian ,  Geert Van der Auwera ,  Vadim Seregin ,  Hilmi Enes Egilmez ,  Marta Karczewicz

IPC: H04N19/176 ,  H04N19/70 ,  H04N19/136 ,  H04N19/33 ,  H04N19/60 ,  H04N19/186 ,  H04N19/159

Abstract: An example device for coding video data includes a 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 scaling matrices may be applied to a low-frequency non-separable transform (LFNST) coded block. The one or more processors are also configured to, based on a determination that scaling matrices may not be applied to the LFNST coded block, not applying the scaling matrices to the LFNST coded block. The one or more processors are also configured to code the video data without applying the scaling matrices to the LFNST coded block.

公开(公告)号：US20210314616A1

公开(公告)日：2021-10-07

申请号：US17223780

申请日：2021-04-06

Applicant: QUALCOMM Incorporated

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

IPC: H04N19/61 ,  H04N19/44 ,  H04N13/161

Abstract: A method for decoding point cloud data comprises, based on a comparison of a maximum difference value and a threshold, applying an inverse function to a set of one or more jointly coded values to recover (i) residual values for attribute values of a current point of point cloud data and (ii) a predictor index that indicates a predictor in a predictor list, wherein predictors in the predictor list are based on attribute values of one or more neighbor points; determining predicted attribute values based on the predictor index; and reconstructing the attribute values of the current point based on the residual values and the predicted attribute values.

公开(公告)号：US20210281843A1

公开(公告)日：2021-09-09

申请号：US17191413

申请日：2021-03-03

Applicant: QUALCOMM Incorporated

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

IPC: H04N19/124 ,  H04N19/70 ,  H04N19/176 ,  H04N19/103 ,  H04N19/18 ,  H04N19/136 ,  H04N19/186 ,  H04N19/30

Abstract: A video decoder can be configured to determine that a new scaling list for a set of scaling lists is to be predicted from a reference scaling list, wherein the new scaling list corresponds to a new scaling matrix; receive a syntax element that identifies an ID number corresponding to a scaling list of the set of scaling lists that is to be used as the reference scaling list; determine that the set of scaling lists does not include a scaling list with the ID number; and in response to determining that the set of scaling lists does not include the scaling list with the ID number, determine the new scaling matrix based on a set of default values.

公开(公告)号：US20210211734A1

公开(公告)日：2021-07-08

申请号：US17143607

申请日：2021-01-07

Applicant: QUALCOMM Incorporated

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

IPC: H04N19/70 ,  H04N19/30 ,  H04N19/174 ,  H04N19/597

Abstract: An example device for coding a point cloud includes a memory configured to store the point cloud and one or more processors communicatively coupled to the memory. The one or more processors are configured to determine a value of a numerator syntax element, the value of the numerator syntax element being indicative of a numerator of a scale factor of the point cloud. The one or more processors are configured to determine a value of a denominator syntax element, the value of the denominator syntax element being indicative of a denominator of the scale factor of the point cloud. The one or more processors are configured to process the point cloud at least in part based on the scale factor of the point cloud.

公开(公告)号：US20210209811A1

公开(公告)日：2021-07-08

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

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.