公开(公告)号：US20210176465A1

公开(公告)日：2021-06-10

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

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：US20210084341A1

公开(公告)日：2021-03-18

申请号：US17024458

申请日：2020-09-17

Applicant: QUALCOMM Incorporated

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

IPC: H04N19/82 ,  H04N19/176 ,  H04N19/186

Abstract: A video coder determines whether a coding mode of a first block of the video data is in a set of applicable coding modes. The set of applicable coding modes includes at least one of a block-based delta pulse code modulation mode, a transform skip mode, or a palette mode. The video coder determines whether a coding mode of a second block of the video data is in the set of applicable coding modes, wherein the second block is adjacent to the first block. The video coder determines that a deblocking filter is disabled for a color component of at least one of the first block or the second block based on at least one of: the coding mode of the first block being in the set of applicable coding modes or the coding mode of the second block being in the set of applicable coding modes.

公开(公告)号：US20210006792A1

公开(公告)日：2021-01-07

申请号：US16918741

申请日：2020-07-01

Applicant: QUALCOMM Incorporated

Inventor： Yu Han ,  Geert Van der Auwera ,  Muhammed Zeyd Coban ,  Wei-Jung Chien ,  Yung-Hsuan Chao ,  Alican Nalci ,  Marta Karczewicz

IPC: H04N19/124 ,  H04N19/176 ,  H04N19/186 ,  H04N19/463 ,  H04N19/96

Abstract: Examples of block-level signaling of quantization parameter offsets is described. Such block-level signaling of quantization parameter offsets provides block level flexibility to determine a more precise chroma quantization parameter (QP) for a chroma block. With the block-level quantization parameter offset signaling described in this disclosure, there is more flexibility in defining the chroma QP, resulting in more accurate determination of chroma QP on a chroma block-by-chroma block basis.

公开(公告)号：US20200260091A1

公开(公告)日：2020-08-13

申请号：US16781751

申请日：2020-02-04

Applicant: QUALCOMM Incorporated

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

IPC: H04N19/159 ,  H04N19/176 ,  H04N19/186 ,  H04N19/169

Abstract: An example device for coding (encoding or decoding) video data includes a memory for storing video data and one or more processors implemented in circuitry and configured to form an inter-prediction block for a current chrominance block of the video data; form an intra-prediction block for the current chrominance block of the video data; determine a number of neighboring blocks to a luminance block corresponding to the current chrominance block that are intra-prediction coded; determine a first weight and a second weight according to the number of neighboring blocks that are intra-prediction coded; apply the first weight to the inter-prediction block and the second weight to the intra-prediction block; combine the first weighted inter-prediction block and the second weighted intra-prediction block to form a prediction block for the current chrominance block; and code the current chrominance block using the prediction block.

公开(公告)号：US20200162728A1

公开(公告)日：2020-05-21

申请号：US16684440

申请日：2019-11-14

Applicant: QUALCOMM Incorporated

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

IPC: H04N19/105 ,  H04N19/159 ,  H04N19/132 ,  H04N19/423 ,  H04N19/136 ,  H04N19/176

Abstract: An example device for coding (encoding or decoding) video data includes a memory configured to store video data; and one or more processors implemented in circuitry and configured to: determine a first number of neighboring blocks to a current block of the video data that are intra-predicted; determine a second number of the neighboring blocks that are inter-predicted; determine a first weight value to be applied to intra-prediction samples of an intra-prediction block for the current block; determine a second weight value to be applied to inter-prediction samples of an inter-prediction block for the current block; generate a prediction block for the current block as a weighted combination of the intra-prediction block to which the first weight value is applied and the inter-prediction block to which the second weight value is applied; and code the current block using the prediction block.

公开(公告)号：US20200021817A1

公开(公告)日：2020-01-16

申请号：US16510863

申请日：2019-07-12

Applicant: QUALCOMM Incorporated

Inventor： Geert Van der Auwera ,  Adarsh Krishnan RAMASUBRAMONIAN ,  Marta KARCZEWICZ

IPC: H04N19/159 ,  H04N19/52 ,  H04N19/105 ,  H04N19/11 ,  H04N19/593 ,  H04N19/176 ,  H04N19/96

Abstract: Techniques are described using Position Dependent Intra Prediction Combination (PDPC) with wide angle intra prediction. For example, a size of the current block of video data can be determined. Based on the size, a wide angle intra-prediction mode can be determined for the current block. A prediction block for the current block can be determined using the wide angle intra-prediction mode. A prediction sample from the prediction block can be modified to generate a modified prediction sample using PDPC, which can include determining one or more reference samples that are external to the current block based on the wide angle intra-prediction mode, and modifying the prediction sample to generate the modified prediction sample based on the determined one or more reference samples.

公开(公告)号：US20200014922A1

公开(公告)日：2020-01-09

申请号：US16503089

申请日：2019-07-03

Applicant: QUALCOMM Incorporated

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

IPC: H04N19/117 ,  H04N19/11 ,  H04N19/176 ,  H04N19/91 ,  H04N19/61

Abstract: A video decoder may be configured to determine that a block of video data is coded using an intra prediction mode with position dependent intra prediction combination (PDPC); in response to the intra prediction mode being a particular intra prediction mode, apply a first filter to a first sample in a first reference line to obtain a first PDPC reference sample value; in response to the intra prediction mode being the particular intra prediction mode, apply a second filter to a second sample in a second reference line to obtain a second PDPC reference sample value; determine a predicted reference sample value based on the intra prediction mode; predict a sample of the block of video data based on the predicted reference sample value, the first PDPC reference sample value, and the second PDPC reference sample value.

公开(公告)号：US20190253733A1

公开(公告)日：2019-08-15

申请号：US16274674

申请日：2019-02-13

Applicant: QUALCOMM Incorporated

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

IPC: H04N19/597 ,  H04N19/70 ,  H04N19/184

Abstract: This disclosure describes techniques for signaling 360-degree video information in syntax structures. As one example, this disclosure describes examples for signaling projection types and related information for 360-degree video in syntax structures that include one or more syntax elements. In some examples, the same syntax structures may include non-360-degree video information as well. Accordingly, the syntax structure may be used for encoding and decoding a bitstream carrying only non-360-degree video data, only 360-degree video data, or both non-360-degree video data and 360-degree video data.

公开(公告)号：US20190253703A1

公开(公告)日：2019-08-15

申请号：US16274889

申请日：2019-02-13

Applicant: QUALCOMM Incorporated

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

IPC: H04N19/105 ,  H04N19/513 ,  H04N19/563 ,  H04N19/70 ,  H04N19/159 ,  H04N19/46 ,  H04N19/176

Abstract: A device for decoding 360-degree video data is configured to store a decoded picture of 360-degree video as a reference frame; derive an extended reference frame from the stored reference frame based on a padding amount by extending a first cube face in the reference frame; inter-predict a block of a current picture from a block of the extended reference frame by determining a motion vector for the block of the current picture; in response to a determination that the motion vector points to a cube face in the extended reference frame other than the first cube face, clipping the motion vector such that the motion vector points to a location in the first cube face; and locating a prediction block for a current block using the clipped motion vector.

公开(公告)号：US10319071B2

公开(公告)日：2019-06-11

申请号：US15253447

申请日：2016-08-31

Applicant: QUALCOMM Incorporated

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

IPC: G06T3/00 ,  G06T3/40 ,  G06T15/00 ,  G06T19/00 ,  H04N13/117 ,  H04N13/122 ,  H04N13/161 ,  H04N13/279

Abstract: Techniques and systems are described for mapping 360-degree video data to a truncated square pyramid shape. A 360-degree video frame can include 360-degrees' worth of pixel data, and thus be spherical in shape. By mapping the spherical video data to the planes provided by a truncated square pyramid, the total size of the 360-degree video frame can be reduced. The planes of the truncated square pyramid can be oriented such that the base of the truncated square pyramid represents a front view and the top of the truncated square pyramid represents a back view. In this way, the front view can be captured at full resolution, the back view can be captured at reduced resolution, and the left, right, up, and bottom views can be captured at decreasing resolutions. Frame packing structures can also be defined for 360-degree video data that has been mapped to a truncated square pyramid shape.