公开(公告)号：US11425420B2

公开(公告)日：2022-08-23

申请号：US17131192

申请日：2020-12-22

Applicant: QUALCOMM Incorporated

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

IPC: H04N19/597 ,  H04N19/176 ,  H04N19/80 ,  H04N19/52 ,  H04N19/70 ,  H04N19/159

Abstract: A video decoder can be configured to obtain, from a picture parameter set (PPS) data structure of video data, a value for a wraparound offset; in response to determining that a block of the video data is encoded in an inter prediction mode, determine a motion vector for the block and a reference picture for the block; determine a horizontal wrap around position in the reference picture based on the value for the wraparound offset; and determine a prediction block for the block based on the horizontal wrap around position.

公开(公告)号：US11418787B2

公开(公告)日：2022-08-16

申请号：US16912232

申请日：2020-06-25

Applicant: QUALCOMM Incorporated

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

IPC: H04N19/186 ,  H04N19/124 ,  H04N19/176 ,  H04N19/169 ,  H04N19/70

Abstract: A video decoder can be configured to determine a predicted luma quantization parameter (QP) for a luma component of a coding unit; receive, in the bitstream of encoded video data, first syntax indicating a luma delta QP value for the luma component; determine a QP value for the luma component based on the predicted luma QP and the luma delta QP value; determine a predicted chroma QP for a chroma component of the coding unit; receive, in the bitstream of encoded video data, second syntax indicating a chroma delta QP value for the chroma component of the coding unit; and determine a QP value for the chroma component of the coding unit based on the predicted chroma QP and the chroma delta QP value.

公开(公告)号：US11381819B2

公开(公告)日：2022-07-05

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 ,  H04N19/96 ,  H04N19/463 ,  H04N19/186

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：US11368684B2

公开(公告)日：2022-06-21

申请号：US16842343

申请日：2020-04-07

Applicant: QUALCOMM Incorporated

Inventor： Vadim Seregin ,  Nan Hu ,  Muhammed Zeyd Coban ,  Marta Karczewicz

IPC: H04N19/117 ,  H04N19/70 ,  H04N19/169

Abstract: Techniques are described for adaptation parameter sets (APS) for adaptive loop filter (ALF) parameters. One example involves obtaining an APS ID value and an APS type value associated with a NAL unit from a bitstream. A first APS associated with at least a portion of at least one picture is identified, with the first APS being uniquely identified by a combination of the APS type value and the APS identifier value, and the APS identifier value of the first APS is in a range based on the APS type value. The portion of the at least one picture is then reconstructed using an adaptive loop filter with parameters defined by the first APS uniquely identified by the APS type value and the APS identifier value.

公开(公告)号：US11336918B2

公开(公告)日：2022-05-17

申请号：US16560907

申请日：2019-09-04

Applicant: QUALCOMM Incorporated

Inventor： Marta Karczewicz ,  Muhammed Zeyd Coban ,  Jie Dong

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

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：US11303904B2

公开(公告)日：2022-04-12

申请号：US16584241

申请日：2019-09-26

Applicant: QUALCOMM Incorporated

Inventor： Marta Karczewicz ,  Muhammed Zeyd Coban

IPC: H04N19/14 ,  H04N19/60 ,  H04N19/124 ,  H04N19/176 ,  H04N19/117 ,  H04N19/18 ,  H04N19/132

Abstract: A device for decoding video data determines a quantization parameter (QP) for a block of transform coefficients, wherein the block of transform coefficients is a non-square, rectangular block; determines a value for (log2 (width)+log2 (height), wherein width represents a width of the block of transform coefficients and height represents a height of the block of transform coefficients; in response to the value not being divisible by 2, determines a modified QP for the block of transform coefficients based on the QP; inverse transforms the transform coefficients to determine a block of quantized residual samples; and dequantizes the quantized residual samples based on the modified QP to determine a block of residual samples.

公开(公告)号：US11284114B2

公开(公告)日：2022-03-22

申请号：US16853232

申请日：2020-04-20

Applicant: QUALCOMM Incorporated

Inventor： Nan Hu ,  Vadim Seregin ,  Marta Karczewicz ,  Muhammed Zeyd Coban

IPC: H04N19/80 ,  H04N19/96 ,  H04N19/70

Abstract: Examples for performing adaptive loop filtering in video coding are described. A video decoder may determine that a number of parameter sets, which each include one or more adaptive filters for adaptive loop filtering, that a current coding structure of the video data refers to for adaptive loop filtering is equal to zero. Based on the number of the parameter sets that the current coding structure refers to for adaptive loop filtering being equal to zero, the video decoder may determine which fixed filter from a set of fixed filters to use for adaptive loop filtering without receiving a syntax element that indicates whether one of the set of fixed filters is to be used for adaptive loop filtering. The video decoder may perform adaptive loop filtering on the current block based on the fixed filter from the set of fixed filters.

公开(公告)号：US11228768B2

公开(公告)日：2022-01-18

申请号：US16991305

申请日：2020-08-12

Applicant: QUALCOMM Incorporated

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

IPC: H04N19/157 ,  H04N19/176 ,  H04N19/132 ,  H04N19/124 ,  H04N19/463 ,  H04N19/122

Abstract: A method of decoding video data includes receiving a value indicating that a lossless mode is enabled for a block of the video data and, in response to determining that the value indicates that the lossless mode is enabled for the block of the video data, determining a maximum size for a lossless-coded transform block of the block of the video data is set to a maximum scanning size of the non-lossless coding block. The method further includes inverse scanning residual values for the block of the video data based on the maximum size for the lossless-coded transform block to generate a residual block for the block of the video data and reconstructing the block of the video data based on the residual block.

公开(公告)号：US11184607B2

公开(公告)日：2021-11-23

申请号：US16889601

申请日：2020-06-01

Applicant: QUALCOMM Incorporated

Inventor： Vadim Seregin ,  Adarsh Krishnan Ramasubramonian ,  Muhammed Zeyd Coban ,  Marta Karczewicz

IPC: H04N19/105 ,  H04N19/46 ,  H04N19/172 ,  H04N19/70 ,  H04N19/159

Abstract: Techniques are described for video encoding and decoding with same picture or count numbering for scalability support. One example involves obtaining a portion of a picture (e.g., a slice, a block, or other portion) and determining if weighted prediction is enabled for the portion of the picture. When weighted prediction is enabled, a zero value picture order count offset indicating a reference picture from a reference picture can be used, though different portion of the picture (e.g., different slices of a picture) can have different picture order count offset values. The portion of the picture can then be reconstructed using the reference picture identified by the zero value picture order count offset. Additional embodiments can use weighted prediction flags and different offset value determinations to support scalability or reference pictures in weighted prediction with a different size than the picture being reconstructed.

公开(公告)号：US20210360289A1

公开(公告)日：2021-11-18

申请号：US17318775

申请日：2021-05-12

Applicant: QUALCOMM Incorporated

Inventor： Yong He ,  Vadim Seregin ,  Muhammed Zeyd Coban ,  Yao-Jen Chang ,  Marta Karczewicz ,  Nan Hu

IPC: H04N19/70 ,  H04N19/184 ,  H04N19/172

Abstract: Example methods and devices for coding video data are disclosed. An example device for coding video data includes 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 a value of a first syntax element indicative of whether a first constraint is applicable, the first constraint being that rectangular slices are not used for a plurality of pictures. The one or more processors are also configured to decode the plurality of pictures of the video data in accordance with the value of the first syntax element.