公开(公告)号：US20210195172A1

公开(公告)日：2021-06-24

申请号：US17119758

申请日：2020-12-11

Applicant: QUALCOMM Incorporated

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

IPC: H04N19/105 ,  H04N19/132 ,  H04N19/30 ,  H04N19/70 ,  H04N19/176

Abstract: A video encoder and video decoder may be configured to disable subpicture processing in situations where reference picture scaling is enabled. In another example, when reference picture scaling is enabled, a video encoder may determine a reference picture scaling ratio for the reference picture resampling process based on a width of a scaling window (PicOutputWidthL) of the current picture and a height of the scaling window (PicOutputHeightL) of the current picture. The values of PicOutputWidthL and PicOutputHeightL are constrained, respectively, relative to a width of a scaling window (refPicOutputWidthL) of the reference picture and a height of the scaling window (refPicOutputHeightL) of the reference picture.

公开(公告)号：US11019346B2

公开(公告)日：2021-05-25

申请号：US16459164

申请日：2019-07-01

Applicant: QUALCOMM Incorporated

Inventor： Muhammed Zeyd Coban ,  Jie Dong ,  Marta Karczewicz

IPC: H04N19/18 ,  H04N19/126 ,  H04N19/96 ,  H04N19/463 ,  H04N19/103 ,  H04N19/176

Abstract: The disclosure describes example techniques for determining a context used for encoding or decoding flags used to indicate a value of a coefficient. The techniques also relate to determining a quantization or dequantization factor to use for the coefficient. For determining the context and the quantization or dequantization factor, a video coder may determine values of flags used for encoding or decoding a previous coefficient and use the determined values of the flags for determining the context and the quantization or dequantization factor for the current coefficient.

公开(公告)号：US10992937B2

公开(公告)日：2021-04-27

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 ,  H04N5/232 ,  H04N19/159 ,  H04N19/176

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：US20210112279A1

公开(公告)日：2021-04-15

申请号：US17066308

申请日：2020-10-08

Applicant: QUALCOMM Incorporated

Inventor： Marta Karczewicz ,  Muhammed Zeyd Coban ,  Alican Nalci ,  Hilmi Enes Egilmez

IPC: H04N19/61 ,  H04N19/70 ,  H04N19/176 ,  H04N19/46 ,  H04N19/124 ,  H04N19/103

Abstract: An example method of decoding video data that includes receiving one or more syntax elements of the video data indicative of whether a first type of coding scheme or a second type of coding scheme is applied to residual values of a block of video data coded with transform skip, wherein the residual values are indicative of a difference between the block and a prediction block, and wherein, in transform skip, the residual values are not transformed from a sample domain to a frequency domain. The method includes determining a type of coding scheme to apply to the residual values based on the one or more syntax elements, determining the residual values based on the determined type of coding scheme, and reconstructing the block based on the determined residual values and the prediction block.

公开(公告)号：US20210092421A1

公开(公告)日：2021-03-25

申请号：US17027262

申请日：2020-09-21

Applicant: QUALCOMM Incorporated

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

IPC: H04N19/44 ,  H04N19/70 ,  H04N19/132 ,  H04N19/423 ,  H04N19/186 ,  H04N19/176

Abstract: A video decoder can be configured to decode a first syntax element indicating a size of a coding tree unit (CTU); after decoding the first syntax element indicating the size of the CTU, decode a second syntax element indicating a width of elements of a subpicture identifier grid; after decoding the first syntax element indicating the size of the CTU, decode a third syntax element indicating a height of the elements of the subpicture identifier grid; and determine a location of a subpicture within a picture based on the first syntax element, the second syntax element, and the third syntax element.

公开(公告)号：US20210092414A1

公开(公告)日：2021-03-25

申请号：US17028928

申请日：2020-09-22

Applicant: QUALCOMM Incorporated

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

IPC: H04N19/189 ,  H04N19/105 ,  H04N19/70 ,  H04N19/176

Abstract: Embodiments are directed to systems and methods of using rice code in video coding. In one embodiment includes a method of encoding or decoding video data, e.g., on a video encoder or decoder. The method includes determining available residual coefficients neighboring a current position in a transform unit of video data and determining a sum of the available residual coefficients. The method further includes modifying the sum based on the number of available residual coefficients and determining a rice parameter based on the modified sum. The method further includes encoding or decoding a syntax element of video data based on the determined rice parameter.

公开(公告)号：US10798417B2

公开(公告)日：2020-10-06

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 ,  H04N19/86 ,  H04N19/117 ,  H04N19/82 ,  H04N19/176 ,  H04N19/167

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：US20200221159A1

公开(公告)日：2020-07-09

申请号：US16736610

申请日：2020-01-07

Applicant: QUALCOMM Incorporated

Inventor： Thomas Stockhammer ,  Muhammed Zeyd Coban ,  Zhen Liu

IPC: H04N21/43 ,  H04N21/4405 ,  H04N21/439 ,  H04N19/70 ,  G06F9/54

Abstract: An example client device for retrieving media data includes a memory configured to store media data; and one or more processors implemented in circuitry and configured to execute a plurality of video decoders; determine a complexity value for the media data including a plurality of encoded video streams, the complexity value representing complexity of an aggregation of the encoded video streams; retrieve the media data including the encoded video streams in response to determining that the client device is capable of decoding the encoded video streams using the complexity value; and distribute the encoded video streams and synchronization information to corresponding video decoders of the plurality of video decoders to cause the video decoders to decode the corresponding video streams and to output decoded video data from the video streams in a synchronized fashion.

公开(公告)号：US20200077117A1

公开(公告)日：2020-03-05

申请号：US16560907

申请日：2019-09-04

Applicant: QUALCOMM Incorporated

Inventor： Marta Karczewicz ,  Muhammed Zeyd Coban ,  Jie Dong

IPC: H04N19/61 ,  H04N19/50 ,  H04N19/176 ,  H04N19/18

Abstract: A video decoder can be configured to determine a threshold number of regular coded bins for a first decoding pass; for a first set of coefficients, context decode syntax elements of a coefficient group until the threshold number of regular coded bins is reached; and in response to reaching the threshold number of regular coded bins, for a second set of coefficients, bypass decode additional syntax elements, wherein to bypass decode the additional syntax elements the video decoder, for a coefficient of the second set of coefficients, derives a value for a Rice parameter based on a sum of absolute values of neighboring coefficients to the coefficient; determine values for the first set of coefficients of the transform unit based on the context decoded syntax elements; and determine values for the second set of coefficients of the transform unit based on the additional syntax elements.

公开(公告)号：US10484682B2

公开(公告)日：2019-11-19

申请号：US16025729

申请日：2018-07-02

Applicant: QUALCOMM Incorporated

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

IPC: H04N19/115 ,  H04N19/597 ,  H04N19/186 ,  H04N19/96 ,  H04N19/176 ,  H04N19/51 ,  H04N19/563 ,  H04N19/105 ,  H04N19/134 ,  H04N19/117 ,  H04N19/85 ,  H04N19/88 ,  G06T15/20

Abstract: This disclosure describes techniques for generating reference frames packed with extended faces from a cubemap projection or adjusted cubemap projection of 360-degree video data. The reference frames packed with the extended faces may be used for inter-prediction of subsequent frames of 360-degree video data.