公开(公告)号：US20210029371A1

公开(公告)日：2021-01-28

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: Techniques are described for wraparound motion compensation such as to better ensure that 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：US20210006794A1

公开(公告)日：2021-01-07

申请号：US16917051

申请日：2020-06-30

Applicant: QUALCOMM Incorporated

Inventor： Marta Karczewicz ,  Yung-Hsuan Chao ,  Hongtao Wang ,  Muhammed Zeyd Coban

IPC: H04N19/126 ,  H04N19/70 ,  H04N19/182 ,  H04N19/103 ,  H04N19/60 ,  H04N19/136

Abstract: A video encoder derives a minimum allowed base quantization parameter for video data based on an input bitdepth of the video data, determines a base quantization parameter for a block of the video data based on the minimum allowed base quantization parameter, and quantizes the block of video data based on the base quantization parameter. In a reciprocal fashion, a video decoder derives a minimum allowed base quantization parameter for the video data based on an input bitdepth of the video data, determines a base quantization parameter for a block of the video data based on the minimum allowed base quantization parameter, and inverse quantizes the block of video data based on the base quantization parameter.

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：US20200296390A1

公开(公告)日：2020-09-17

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

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：US20190387231A1

公开(公告)日：2019-12-19

申请号：US16443557

申请日：2019-06-17

Applicant: QUALCOMM Incorporated

Inventor： Muhammed Zeyd Coban ,  Marta Karczewicz ,  Jie Dong

IPC: H04N19/13 ,  H04N19/12 ,  H04N19/176 ,  H04N19/159 ,  H04N5/232

Abstract: A method and apparatus for coding levels of transform coefficients of a block of video data. The levels of transform coefficients are coded using both context-coded bins and bypass-coded bins. A video decoder may receive encoded bins representing levels of transform coefficients of a block of video data, decode context-coded bins of the levels of the transform coefficients in a coefficient-by-coefficient order, and decode bypass-coded bins of the levels of the transform coefficients in the coefficient-by-coefficient order after decoding the context-coded bins.

公开(公告)号：US10390044B2

公开(公告)日：2019-08-20

申请号：US15486156

申请日：2017-04-12

Applicant: QUALCOMM Incorporated

Inventor： Marta Karczewicz ,  Muhammed Zeyd Coban ,  Peisong Chen ,  Hsiao-Chiang Chuang ,  Rajan Laxman Joshi

IPC: H04N19/11 ,  H04N19/13 ,  H04N19/14 ,  H04N19/46 ,  H04N19/60 ,  H04N19/61 ,  H04N19/85 ,  H04N19/96 ,  H04N19/122 ,  H04N19/129 ,  H04N19/132 ,  H04N19/157 ,  H04N19/159 ,  H04N19/176 ,  H04N19/194 ,  H04N19/196 ,  H04N19/593

Abstract: In one example, an apparatus for encoding video data includes a video encoder configured to select an intra-prediction mode to use to encode a block of video data, determine whether the block includes a sub-block of a size for which multiple transforms are possible based on the size of the sub-block and the selected intra-prediction mode, when the block includes the sub-block of the size for which multiple transforms are possible based on the size of the sub-block and the selected intra-prediction mode, select one of the multiple possible transforms, transform the sub-block using the selected one of the multiple possible transforms, and provide an indication of the selected one of the multiple possible transforms for the size of the block.

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：US20190014347A1

公开(公告)日：2019-01-10

申请号：US16026350

申请日：2018-07-03

Applicant: QUALCOMM Incorporated

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

IPC: H04N19/597 ,  H04N19/82 ,  H04N19/86

Abstract: A method of decoding 360-degree video, including receiving video data indicative of a 360-degree video picture projected onto a 2D picture, the 2D picture being divided into a plurality of blocks, predicting a first of the blocks of the 2D picture, and deblock filtering pixels along a border of the first of the blocks based on the position of the border between the first of the blocks and a second of the blocks in the 360-degree video picture.

公开(公告)号：US10085024B2

公开(公告)日：2018-09-25

申请号：US13800268

申请日：2013-03-13

Applicant: QUALCOMM Incorporated

Inventor： Yang Yu ,  Muhammed Zeyd Coban ,  Marta Karczewicz

IPC: H04B1/66 ,  H04N7/12 ,  H04N11/02 ,  H04N11/04 ,  H04N19/126 ,  H04N19/147 ,  H04N19/172 ,  H04N19/149 ,  H04N19/18

CPC classification number: H04N19/126 ,  H04N19/147 ,  H04N19/149 ,  H04N19/172 ,  H04N19/18

Abstract: A computing device, such as a video encoder, uses respective positions of respective coefficients in a coefficient block to look up, in a lookup table, respective quantization offsets for the respective coefficients. Furthermore, the computing device determines, based at least in part on the quantization offsets for the one or more coefficients, respective quantized levels for the respective coefficients.