公开(公告)号：US20200296378A1

公开(公告)日：2020-09-17

申请号：US16816016

申请日：2020-03-11

Applicant: QUALCOMM Incorporated

Inventor： Jie Dong ,  Amir Said ,  Vadim Seregin ,  Marta Karczewicz

IPC: H04N19/13 ,  H04N19/91 ,  H04N19/124 ,  H04N19/44

Abstract: An example method for entropy decoding of video data includes retrieving a pre-defined initialization value for a context of a plurality of contexts used in a context-adaptive entropy coding process to entropy code a value for a syntax element for an independently codable unit of video data; determining, based on the pre-defined initialization value and in a linear domain, an initial probability state of the context; and entropy decoding, from a bitstream and based on the initial probability state of the context, a bin of the value for the syntax element.

公开(公告)号：US20200252622A1

公开(公告)日：2020-08-06

申请号：US16777267

申请日：2020-01-30

Applicant: QUALCOMM Incorporated

Inventor： Hilmi Enes Egilmez ,  Vadim Seregin ,  Amir Said ,  Marta Karczewicz

IPC: H04N19/159 ,  H04N19/176 ,  H04N19/96 ,  H04N19/60

Abstract: An example device applies a primary transform to a current block of video data to create primary transform coefficients. The device determines whether intra sub-partitioning is applied to the current block of video data. The device applies a primary transform to the current block. The device also determines whether a primary transform size for the current block of video data is at least a predetermined size. Based on intra sub-partitioning being applied and the primary transform size being at least the predetermined size, the device applies a secondary transform to primary transform coefficients and codes the current block of video data based on the secondary transform.

公开(公告)号：US10666937B2

公开(公告)日：2020-05-26

申请号：US15848803

申请日：2017-12-20

Applicant: QUALCOMM Incorporated

Inventor： Xin Zhao ,  Vadim Seregin ,  Li Zhang ,  Marta Karczewicz ,  Amir Said

IPC: H04N19/105 ,  H04N19/18 ,  H04N19/176 ,  H04N19/126 ,  H04N19/184 ,  H04N19/136 ,  H04N19/122 ,  H04N19/124 ,  H04N19/129 ,  H04N19/13 ,  H04N19/51 ,  H04N19/593 ,  H04N19/61

Abstract: Sign prediction technology for video coding are generally described. An example device includes a memory configured to store video data, and processing circuitry in communication with the memory. The processing circuitry is configured to determine that a block of the video data stored to the memory is eligible to be coded using sign prediction, to perform the sign prediction with respect to one or more transform coefficients of the block only if the block meets a predetermined criterion, wherein the predetermined criterion is based on at least one of: a width of the block, a height of the block, a coding mode used to code the block, or a position of one or more sign-predicted transform coefficients within the block, and to code the block based on the sign prediction performed with respect to the block.

公开(公告)号：US10609367B2

公开(公告)日：2020-03-31

申请号：US15848759

申请日：2017-12-20

Applicant: QUALCOMM Incorporated

Inventor： Xin Zhao ,  Vadim Seregin ,  Li Zhang ,  Marta Karczewicz ,  Amir Said

IPC: H04N19/105 ,  H04N19/122 ,  H04N19/124 ,  H04N19/126 ,  H04N19/129 ,  H04N19/13 ,  H04N19/136 ,  H04N19/176 ,  H04N19/18 ,  H04N19/184 ,  H04N19/51 ,  H04N19/593 ,  H04N19/61

Abstract: A device includes processing circuitry configured to identify a set of pre-stored residual samples in video data that is stored to a memory, to combine the set of stored residual samples to form a combination, to apply a first sign combination to transform coefficients of the combination to obtain a first hypothesis reconstruction for a current block of the video data, and to apply a second sign combination to the transform coefficients of the combination to obtain a second hypothesis reconstruction for the current block. The processing circuitry is further configured to derive respective cost functions with respect to the first and second hypothesis reconstructions, to compare the respective derived cost functions, to select, based on the comparison, either the first or second hypothesis reconstruction, and to code the current block using a sign prediction associated with the selected one of the first or second hypothesis reconstruction.

公开(公告)号：US20200021852A1

公开(公告)日：2020-01-16

申请号：US16511927

申请日：2019-07-15

Applicant: QUALCOMM Incorporated

Inventor： Yung-Hsuan Chao ,  Amir Said ,  Hilmi Enes Egilmez ,  Vadim Seregin ,  Marta Karczewicz

IPC: H04N19/625 ,  H04N19/20 ,  H04N19/61

Abstract: This disclosure describes examples of extending the number of available discrete cosine transform (DCT) and discrete sine transform (DST) for encoding and decoding. A video coder may determine one or more transforms or inverse transforms to apply from a set of transforms or inverse transforms that includes DCT-2 or inverse DCT-2, DST-7 or inverse DST-7, DST-8 or inverse DST-8, DCT-3 or inverse DCT-3, DST-2 or inverse DST-2, DST-3 or inverse DST-3, DCT-4 or inverse DCT-4, DST-4 or inverse DST-4, DST-5 or inverse DST-5, DST-6 or inverse DST-6, and identity transform an inverse identity transform (IDT).

公开(公告)号：US20190306522A1

公开(公告)日：2019-10-03

申请号：US16368455

申请日：2019-03-28

Applicant: QUALCOMM Incorporated

Inventor： Amir Said ,  Hilmi Enes Egilmez ,  Marta Karczewicz ,  Vadim Seregin

IPC: H04N19/44 ,  H04N19/625 ,  H04N19/96 ,  H04N19/176 ,  G06F17/16

Abstract: A device may perform a first prediction process for a first block of video data to produce a first residual. The device may apply a first transform process to the first residual to generate first transform coefficients for the first block of video data and encode the first transform coefficients. The device may perform a second prediction process for a second block of video data to produce a second residual. The device may determine that a second transform process, which includes the first transform process and at least one of a pre-adjustment operation or a post-adjustment operation, is to be applied to the second residual. The device may apply the first transform process and the pre- or post-adjustment operation to the second residual to generate second transform coefficients for the second block. The coding device may code the first and second transform coefficients.

公开(公告)号：US10425648B2

公开(公告)日：2019-09-24

申请号：US15272034

申请日：2016-09-21

Applicant: QUALCOMM Incorporated

Inventor： Amir Said ,  Xin Zhao ,  Jianle Chen ,  Marta Karczewicz

IPC: H04N19/159 ,  H04N19/105 ,  H04N19/117 ,  H04N19/147 ,  H04N19/157 ,  H04N19/176 ,  H04N19/182 ,  H04N19/70 ,  H04N19/593 ,  H04N19/11 ,  H04N19/146 ,  H04N19/172

Abstract: Techniques are described to improved video intra prediction using position-dependent prediction combination in video coding. In High Efficiency Video Encoding a set of 35 linear predictors are used for doing intra coding and prediction can be computed from either a nonfiltered or a filtered set of neighboring “reference” pixels, depending on the selected predictor mode and block size. Techniques of this disclosure may use a weighted combination of both the nonfiltered and filtered set of reference pixels to achieve better compression via improved prediction and therefore small residual, enable effective parallel computation of all sets of prediction values, and maintain low complexity via applying filtering only to a set of reference pixels and not to predicted values themselves.

公开(公告)号：US20180176582A1

公开(公告)日：2018-06-21

申请号：US15848862

申请日：2017-12-20

Applicant: QUALCOMM Incorporated

Inventor： Xin Zhao ,  Vadim Seregin ,  Li Zhang ,  Marta Karczewicz ,  Amir Said

IPC: H04N19/18 ,  H04N19/129 ,  H04N19/176 ,  H04N19/51 ,  H04N19/593 ,  H04N19/61 ,  H04N19/124 ,  H04N19/13

CPC classification number: H04N19/105 ,  H04N19/122 ,  H04N19/124 ,  H04N19/126 ,  H04N19/129 ,  H04N19/13 ,  H04N19/136 ,  H04N19/176 ,  H04N19/18 ,  H04N19/184 ,  H04N19/51 ,  H04N19/593 ,  H04N19/619

Abstract: Techniques for cost function measurement with respect to sign prediction-based video coding are generally described. An example device includes processing circuitry is configured to apply first and second sign combinations to transform coefficients of a stored block of video data to obtain first and second hypothesis reconstructions of the block, to measure first and second cost functions with respect to the first and second hypothesis reconstructions by determining respective sets of pixel value gradients representing differences between samples of each hypothesis reconstruction of the block and samples of a neighboring block positioned adjacent to the block. The processing circuitry is further configured to compare the respective cost functions, to select, based on the comparison, one of the hypothesis reconstructions of the block, and to code the block using the respective sign combination associated with the selected hypothesis reconstruction.

公开(公告)号：US20170272748A1

公开(公告)日：2017-09-21

申请号：US15463428

申请日：2017-03-20

Applicant: QUALCOMM Incorporated

Inventor： Vadim Seregin ,  Xin Zhao ,  Amir Said ,  Marta Karczewicz

IPC: H04N19/11 ,  H04N19/159 ,  H04N19/61 ,  H04N19/91 ,  H04N19/70 ,  H04N19/46

Abstract: A method of decoding video data comprises receiving a bitstream of encoded video data, the encoded video data representing partitioned luma blocks and partitioned chroma blocks, wherein the chroma blocks are partitioned independently of the luma blocks, determining a respective coding mode corresponding to the respective partitioned luma blocks, decoding the respective partitioned luma blocks according to the determined respective coding modes, decoding a first syntax element indicating that the respective coding modes associated with the respective partitioned luma blocks are to be used for decoding a first partitioned chroma block, wherein the first partitioned chroma block is aligned with two or more partitioned luma blocks, determining a chroma coding mode for the first partitioned chroma block according to a function of the respective coding modes of the two or more partitioned luma blocks, and decoding the first partitioned chroma block in accordance with the determined chroma coding mode.

公开(公告)号：US20170094285A1

公开(公告)日：2017-03-30

申请号：US15272034

申请日：2016-09-21

Applicant: QUALCOMM Incorporated

Inventor： Amir Said ,  Xin Zhao ,  Jianle Chen ,  Marta Karczewicz

IPC: H04N19/159 ,  H04N19/147 ,  H04N19/117 ,  H04N19/70 ,  H04N19/105 ,  H04N19/157

Abstract: Techniques are described to improved video intra prediction using position-dependent prediction combination in video coding. In High Efficiency Video Encoding a set of 35 linear predictors are used for doing intra coding and prediction can be computed from either a nonfiltered or a filtered set of neighboring “reference” pixels, depending on the selected predictor mode and block size. Techniques of this disclosure may use a weighted combination of both the nonfiltered and filtered set of reference pixels to achieve better compression via improved prediction and therefore small residual, enable effective parallel computation of all sets of prediction values, and maintain low complexity via applying filtering only to a set of reference pixels and not to predicted values themselves.