公开(公告)号：US20220256203A1

公开(公告)日：2022-08-11

申请号：US17650935

申请日：2022-02-14

Applicant: QUALCOMM Incorporated

Inventor： Li Zhang ,  Wei-Jung Chien ,  Jianle Chen ,  Xin Zhao ,  Marta Karczewicz

IPC: H04N19/96 ,  H04N19/70 ,  H04N19/593 ,  H04N19/11 ,  H04N19/463 ,  H04N19/186 ,  H04N19/46

Abstract: An example device includes a memory and processing circuitry in communication with the memory. The processing circuitry of a device is configured to form a most probable mode (MPM) candidate list for a chroma block of the video data stored to the memory, such that the MPM candidate list includes one or more derived modes (DMs) associated with a luma block of the video data associated with the chroma block, and a plurality of luma prediction modes that can be used for coding luminance components of the video data. The processing circuitry is further configured to select a mode from the MPM candidate list, and to code the chroma block according to the mode selected from the MPM candidate list.

公开(公告)号：US11412224B2

公开(公告)日：2022-08-09

申请号：US17197883

申请日：2021-03-10

Applicant: QUALCOMM Incorporated

Inventor： Xin Zhao ,  Vadim Seregin ,  Marta Karczewicz ,  Jianle Chen

IPC: H04N19/159 ,  H04N19/593 ,  H04N19/124 ,  H04N19/61 ,  H04N19/176 ,  H04N19/12 ,  H04N19/103

Abstract: Example techniques are described to illustrate multiple transform applied for Intra prediction residual. It may be used in the context of advanced video codecs, such as extensions of HEVC or the next generation of video coding standards. A video encoder and a video decoder may select transform subsets that each identify one or more candidate transforms. The video encoder and the video decoder may determine transforms from the selected transform subsets.

公开(公告)号：US11146795B2

公开(公告)日：2021-10-12

申请号：US15914514

申请日：2018-03-07

Applicant: QUALCOMM Incorporated

Inventor： Vadim Seregin ,  Marta Karczewicz ,  Xin Zhao

IPC: H04N19/159 ,  H04N19/61 ,  H04N19/82 ,  H04N19/126 ,  H04N19/70 ,  H04N19/14 ,  H04N19/18 ,  H04N19/176 ,  H04N19/11 ,  H04N19/117 ,  H04N19/13 ,  H04N19/147 ,  H04N19/157

Abstract: A method of decoding video data including, receiving a first block of video data, receiving a first syntax element indicating if a coding mode is to be used for the first block of video data in the case that the first block of video data is associated with a number of non-zero transform coefficients greater than or equal to a threshold, explicitly decoding a value of the received first syntax element, and applying the coding mode to the first block of video data in accordance with a value of the first syntax element.

公开(公告)号：US11095893B2

公开(公告)日：2021-08-17

申请号：US15782686

申请日：2017-10-12

Applicant: QUALCOMM Incorporated

Inventor： Cheng-Teh Hsieh ,  Vadim Seregin ,  Xin Zhao ,  Amir Said ,  Vijayaraghavan Thirumalai ,  Marta Karczewicz

IPC: H04N19/122 ,  H04N19/176 ,  H04N19/18 ,  H04N19/169 ,  H04N19/124

Abstract: A video coding device (e.g., a video encoder or a video decoder) is configured to perform various transformations on video data. The video coding device applies a primary transform to a block of the video data, the primary transform having a first size, and the sub-block being at least a portion of the block. The video coding device determines whether application of a secondary transform, having a second size, to a sub-block of the block is allowed. Application of the secondary transform is disallowed when the first size is equal to the second size. Based on the application of the secondary transform being allowed, the video coding device applies the secondary transform to the sub-block. Application of the primary transform and the secondary transform construct a residual block in a pixel domain.

公开(公告)号：US20210195195A1

公开(公告)日：2021-06-24

申请号：US17197883

申请日：2021-03-10

Applicant: QUALCOMM Incorporated

Inventor： Xin Zhao ,  Vadim Seregin ,  Marta Karczewicz ,  Jianle Chen

IPC: H04N19/124 ,  H04N19/61 ,  H04N19/176 ,  H04N19/12 ,  H04N19/103

Abstract: Example techniques are described to illustrate multiple transform applied for Intra prediction residual. It may be used in the context of advanced video codecs, such as extensions of HEVC or the next generation of video coding standards. A video encoder and a video decoder may select transform subsets that each identify one or more candidate transforms. The video encoder and the video decoder may determine transforms from the selected transform subsets.

公开(公告)号：US10764587B2

公开(公告)日：2020-09-01

申请号：US16020179

申请日：2018-06-27

Applicant: QUALCOMM Incorporated

Inventor： Kai Zhang ,  Jianle Chen ,  Xin Zhao ,  Marta Karczewicz

IPC: H04N19/159 ,  H04N19/593 ,  H04N19/109 ,  H04N19/11 ,  H04N19/176 ,  H04N19/186 ,  H04N19/70

Abstract: An apparatus configured to encode or decode video data that includes a memory configured to store at least one reconstructed sample of video data and at least one processor, in communication with the memory, that is configured to identify at least one reconstructed sample, determine at least one extended angular intra prediction mode to use for intra prediction of at least one sample of a current block, intra predict, using the at least one extended angular intra prediction mode, at least one sample of the current block based on the at least one reconstructed sample, extended angular intra prediction modes including angular intra prediction modes other than angular prediction modes between horizontal −45 degrees and vertical −45 degrees, and encode or decode the current block based on the at least one predicted sample.

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：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：US10382781B2

公开(公告)日：2019-08-13

申请号：US15709270

申请日：2017-09-19

Applicant: QUALCOMM Incorporated

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

IPC: H04N19/102 ,  H04N19/105 ,  H04N19/11 ,  H04N19/115 ,  H04N19/119 ,  H04N19/573 ,  H04N19/117 ,  H04N19/159 ,  H04N19/176 ,  H04N19/82 ,  H04N19/593 ,  H04N19/59

Abstract: Techniques are described in which a video coder is configured to determine, using one or more characteristics of an interpolation filter, a number of reference samples to be stored at a reference buffer. The video coder is further configured to generate a plurality of values corresponding to the number of reference samples in the reference buffer. The video coder is further configured to generate prediction information for intra-prediction using the interpolation filter and the plurality of values. The video coder is further configured to reconstruct the block of video data based on the prediction information.