公开(公告)号：US11895291B2

公开(公告)日：2024-02-06

申请号：US17056111

申请日：2019-05-23

Applicant: MEDIATEK INC.

Inventor： Yu-Chi Su ,  Ching-Yeh Chen ,  Zhi-Yi Lin ,  Tzu-Der Chuang

IPC: H04N19/105 ,  H04N19/159 ,  H04N19/176 ,  H04N19/51

CPC classification number: H04N19/105 ,  H04N19/159 ,  H04N19/176 ,  H04N19/51

Abstract: A method and apparatus of encoding or decoding for a coding system, where bi-directional CU (coding unit) weighting (BCW) is enabled for the coding system to allow using multiple pairs of weights, are disclosed. According to this method, a Merge candidate list is generated for the current block, where current bi-directional CU weights for a bi-directional predictor of the current block associated with a target Merge candidate in the Merge candidate list are set to a pre-define pair of weights when the target Merge candidate corresponds to a selected Merge candidate. In another method, current bi-directional CU weights for a bi-directional predictor associated with a target Merge candidate in the Merge candidate list are inherited from the target Merge candidate when the target Merge candidate corresponds to a selected Merge candidate.

公开(公告)号：US11805245B2

公开(公告)日：2023-10-31

申请号：US17874009

申请日：2022-07-26

Applicant: MediaTek Inc.

Inventor： Chih-Yao Chiu ,  Chun-Chia Chen ,  Chih-Wei Hsu ,  Ching-Yeh Chen ,  Tzu-Der Chuang ,  Yu-Wen Huang

IPC: H04N19/105 ,  H04N19/176 ,  H04N19/182 ,  H04N19/136

CPC classification number: H04N19/105 ,  H04N19/136 ,  H04N19/176 ,  H04N19/182

Abstract: For each prediction candidate of a set of one or more prediction candidates of the current block, a video coder computes a matching cost between a set of reference pixels of the prediction candidate in a reference picture and a set of neighboring pixels of a current block in a current picture. The video coder identifies a subset of the reference pictures as major reference pictures based on a distribution of the prediction candidates among the reference pictures of the current picture. A bounding block is defined for each major reference picture, the bounding block encompassing at least portions of multiple sets of reference pixels for multiple prediction candidates. The video coder assigns an index to each prediction candidate based on the computed matching cost of the set of prediction candidates. A selection of a prediction candidate is signaled by using the assigned index of the selected prediction candidate.

公开(公告)号：US11785207B2

公开(公告)日：2023-10-10

申请号：US17567302

申请日：2022-01-03

Applicant: MEDIATEK INC.

Inventor： Chen-Yen Lai ,  Yu-Ling Hsiao ,  Tzu-Der Chuang ,  Ching-Yeh Chen

IPC: H04N19/105 ,  H04N19/159 ,  H04N19/176 ,  H04N19/186 ,  H04N19/96

CPC classification number: H04N19/105 ,  H04N19/159 ,  H04N19/176 ,  H04N19/186 ,  H04N19/96

Abstract: Video processing methods comprise receiving input data of a current block in a current picture, constructing a candidate list for the current block by including one or more History-based Motion Vector Predictor (HMVP) candidates, selecting one candidate from the candidate list, locating a reference block according to motion information of the selected candidate, and encoding or decoding the current block by predicting the current block using the reference block. The one or more HMVP candidates are fetched from a normal HMVP table if the current block is to be processed by a normal inter prediction mode, and the one or more HMVP candidates are fetched form a Current Picture Referencing (CPR) HMVP table if the current block is to be processed by a CPR mode. The two HMVP tables are separately maintained and updated.

公开(公告)号：US11743458B2

公开(公告)日：2023-08-29

申请号：US17286713

申请日：2019-10-18

Applicant: MEDIATEK INC.

Inventor： Ching-Yeh Chen ,  Tzu-Der Chuang ,  Yu-Chi Su ,  Chih-Wei Hsu ,  Yu-Wen Huang

IPC: H04N19/117 ,  H04N19/132 ,  H04N19/176 ,  H04N19/186 ,  H04N19/80

CPC classification number: H04N19/117 ,  H04N19/132 ,  H04N19/176 ,  H04N19/186 ,  H04N19/80

Abstract: Methods and apparatus for in-loop processing of reconstructed video are disclosed. According to one method, a virtual boundary is determined for to-be-processed pixels in the current picture, where the virtual boundary is aligned with block boundaries and at least one to-be-processed pixel on a first side of the virtual boundary requires one or more second pixels on a second side of the virtual boundary. According to the method, the in-loop processing is modified if a target to-be-processed pixel requires at least one second pixel from the second side of the virtual boundary and the modified in-loop processing eliminates the need for any second pixel on the second side of the virtual boundary. According to another method, the operations of block classification are changed when part of the required pixels in one 10×10 window used in classification are at the other side of virtual boundaries.

公开(公告)号：US11595656B2

公开(公告)日：2023-02-28

申请号：US17424639

申请日：2020-01-22

Applicant: MEDIATEK INC.

Inventor： Tzu-Der Chuang ,  Ching-Yeh Chen

IPC: H04N19/13 ,  H04N19/105 ,  H04N19/176 ,  H04N19/18

Abstract: A method and apparatus for encoding or decoding transform coefficients in a video coding system are disclosed. According to this method, a region after zero-outis determined. A remaining number of context-coded bins is determined for the current TB based on a size of the region after zero-out. The current TB is encoded or decoded using context-based coding with a constraint based on the remaining number of context-coded bins. According to another method, a remaining number of context-coded bins is determined for the current TB based on the last significant CG index.

公开(公告)号：US11589049B2

公开(公告)日：2023-02-21

申请号：US17395549

申请日：2021-08-06

Applicant: MEDIATEK INC.

Inventor： Tzu-Der Chuang ,  Ching-Yeh Chen ,  Kung-Nien Yang ,  Chun-Chia Chen

IPC: H04N19/70 ,  H04N19/119 ,  H04N19/176 ,  H04N19/186 ,  H04N19/96

Abstract: A method and apparatus of video coding operate by receiving input data associated with a current data unit in a current picture, wherein the current data unit includes a luma component and a chroma component and the current data unit includes a luma data unit and a chroma data unit. The operation proceeds by splitting the luma data unit and the Chroma data unit using one shared tree until the luma data unit and the chroma data unit reach a stop node, encoding or decoding the stop node as a leaf CU (coding unit) if the stop node is greater than M×N for the luma component, M and N are positive integers, and signalling or parsing a prediction mode for the stop node if the stop node is smaller than or equal to M×N for the luma component.

公开(公告)号：US11589044B2

公开(公告)日：2023-02-21

申请号：US17068817

申请日：2020-10-12

Applicant: MediaTek Inc.

Inventor： Shih-Ta Hsiang ,  Chen-Yen Lai ,  Ching-Yeh Chen

IPC: H04N11/02 ,  H04N19/119 ,  H04N19/176 ,  H04N19/184 ,  H04N19/96 ,  H04N19/44

Abstract: A video system that applies constraints on block partitioning is provided. The system receives a partitioning control parameter from a bitstream specifying a maximum block size for enabling ternary-tree split that is constrained to be 64 or smaller. The system receives data from a bitstream for a block of pixels to be decoded as a current block of a current picture of a video. The system splits the current block into one or more partitions recursively, wherein ternary split is disallowed for a partition of the current block unless the partition is less than or equal to the maximum block size. The system reconstructs the one or more partitions of the current block.

公开(公告)号：US11582466B2

公开(公告)日：2023-02-14

申请号：US17180190

申请日：2021-02-19

Applicant: MediaTek Inc.

Inventor： Chen-Yen Lai ,  Ching-Yeh Chen ,  Tzu-Der Chuang ,  Olena Chubach

IPC: H04N19/169 ,  H04N19/503

Abstract: A video coding method using inter-layer prediction or referencing is provided. A video decoder receives data from a bitstream carrying data for video pictures in a plurality of different layers. At least one of the plurality of layers comprises temporal sublayers that correspond to levels in a hierarchical temporal prediction structure. Each temporal sublayer is associated with a temporal identifier. The video decoder receives an inter-layer prediction constraint parameter constraining a maximum temporal sublayer used in inter-layer prediction. The video decoder reconstructs a first picture in a first layer by referencing data of a second picture in a second layer. A temporal identifier of the referenced data satisfies the received inter-layer prediction constraint parameter.

公开(公告)号：US11582454B2

公开(公告)日：2023-02-14

申请号：US17441795

申请日：2020-03-23

Applicant: MEDIATEK INC.

Inventor： Chen-Yen Lai ,  Tzu-Der Chuang ,  Ching-Yeh Chen ,  Chih-Wei Hsu ,  Yu-Wen Huang ,  Olena Chubach

IPC: H04N19/126 ,  H04N19/132 ,  H04N19/176 ,  H04N19/18 ,  H04N19/186 ,  H04N19/61 ,  H04N19/70

Abstract: A method and apparatus for video coding utilizing a current block, a maximum side of the transform block of the current block corresponds to 64. A scaling matrix is derived from elements of an 8×8 base scaling matrix, where the elements in a bottom-right 4×4 region of the 8×8 base scaling matrix are skipped, either not signaled or set to zero. According to another method, a current block belongs to a current picture in a first color format that has only a first color component. A first scaling matrix is signaled at the video encoder side or parsed at the video decoder side for the first color component of the current block. Signaling any second scaling matrix is disabled at the video encoder side or parsing any second scaling matrix is disabled at the video decoder side for a second or third color component of the current block.

公开(公告)号：US11539939B2

公开(公告)日：2022-12-27

申请号：US17104037

申请日：2020-11-25

Applicant: MEDIATEK INC.

Inventor： Chih-Yao Chiu ,  Chun-Chia Chen ,  Chih-Wei Hsu ,  Ching-Yeh Chen ,  Yu-Wen Huang ,  Tzu-Der Chuang

IPC: H04N19/159 ,  H04N19/105 ,  H04N19/176 ,  H04N19/30 ,  H04N19/46 ,  H04N19/52

Abstract: Video processing methods and apparatuses for processing a current block in a current picture include receiving input data of the current block, determining a reference picture, determining whether picture sizes of the current and reference pictures are different, determining whether horizontal wraparound motion compensation is enabled for predicting the current block, performing motion compensation for the current block to obtain a reference block from the reference picture, and encoding or decoding the current block according to the reference block. Horizontal wraparound motion compensation is disabled when the picture sizes of the current and reference pictures are different.