公开(公告)号：US20210227248A1

公开(公告)日：2021-07-22

申请号：US17226354

申请日：2021-04-09

Applicant: MEDIATEK INC.

Inventor： Tzu-Der CHUANG ,  Ching-Yeh CHEN ,  Yu-Wen HUANG

IPC: H04N19/52 ,  H04N19/56 ,  H04N19/577 ,  H04N19/44 ,  H04N19/176 ,  H04N19/184

Abstract: Method and apparatus of video coding using decoder derived motion information based on bilateral matching or template matching are disclosed. According to one method, merge index for merge candidate group comprising bilateral matching merge candidate and/or template matching merge candidate are signalled using different codewords. According to another method, the first-stage MV or the first-stage MV pair is used as an only initial MV or MV pair or used as a central MV of search window for second-stage search. According to yet another method, after the reference template for a first reference list is found, the current template is modified for template search in the other reference list. According to yet another method, the sub-PU search is disabled for the template search. According to yet another method, block difference calculation is based on reduced bit depth during MV search associated with the decoder-side MV derivation process.

公开(公告)号：US20210218956A1

公开(公告)日：2021-07-15

申请号：US17117757

申请日：2020-12-10

Applicant: MEDIATEK INC.

Inventor： Tzu-Der CHUANG ,  Ching-Yeh CHEN

IPC: H04N19/105 ,  H04N19/132 ,  H04N19/70 ,  H04N19/186 ,  H04N19/176

Abstract: Method and apparatus of coding a video sequence are disclosed, wherein Reference Picture Resampling (RPR) mode is included as a coding tool. According to the method, a bitstream corresponding to encoded data of the video sequence is generated or received, where the bitstream includes one or more syntaxes related to the RPR mode when the RPR mode is enabled, and scaling information for the RPR mode is derived using first information including said one or more syntaxes, and wherein said one or more syntaxes are constrained by taking into account a value corresponding to Max(8, (minimum coding block size for a luma component)). A target picture of the video sequence is encoded or decoded utilizing the scaling information when the RPR mode is enabled for the target picture.

公开(公告)号：US20210211644A1

公开(公告)日：2021-07-08

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 ,  H04N19/51 ,  H04N19/176

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：US20210195202A1

公开(公告)日：2021-06-24

申请号：US17249665

申请日：2021-03-09

Applicant: MEDIATEK INC.

Inventor： Zhi-Yi LIN ,  Tzu-Der CHUANG ,  Ching-Yeh CHEN ,  Chih-Wei HSU

IPC: H04N19/132 ,  H04N19/105 ,  G06F17/16 ,  H04N19/176 ,  H04N19/159

Abstract: Method and apparatus of video coding are disclosed. According to one method, the left reference boundary samples and the top reference boundary samples are checked jointly. According to another method, selected original left reference boundary samples and selected original top reference boundary samples at specific positions are used for predictor up-sampling. According to yet another method, the horizontal interpolation and the vertical interpolation are in a fixed order regardless of a shape of the current block, size of the current block or both.

公开(公告)号：US20210176501A1

公开(公告)日：2021-06-10

申请号：US17110491

申请日：2020-12-03

Applicant: MEDIATEK INC.

Inventor： Ching-Yeh CHEN ,  Olena CHUBACH ,  Chen-Yen LAI ,  Tzu-Der CHUANG ,  Chih-Wei HSU ,  Yu-Wen HUANG

IPC: H04N19/82 ,  H04N19/176 ,  H04N19/186 ,  H04N19/70 ,  H04N19/46 ,  H04N19/172 ,  H04N19/117 ,  H04N19/174

Abstract: Encoding methods and apparatuses include applying a Cross-Component Adaptive Loop Filter (CCALF) processing on a current picture based on CCALF coefficients signaled in one or more Adaptive Loop Filter (ALF) Adaptation Parameter Sets (APSs) to refine one or more chroma components according to a luma component, signaling two ALF signal flags and two CCALF signal flags in each ALF APS or parsing two ALF signal flags and two CCALF signal flags from each ALF APS, and encoding or decoding the current picture. Values of the two ALF signal flags and the two CCALF signal flags in each ALF APS are not all equal to 0 to ensure none of the ALF APS is an empty APS.

公开(公告)号：US20210160482A1

公开(公告)日：2021-05-27

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

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.

公开(公告)号：US20210014536A1

公开(公告)日：2021-01-14

申请号：US16977158

申请日：2019-03-13

Applicant: MEDIATEK INC.

Inventor： Chun-Chia CHEN ,  Chia-Ming TSAI ,  Yu-Chi SU ,  Chen-Yen LAI ,  Chih-Wei HSU ,  Ching-Yeh CHEN ,  Tzu-Der CHUANG ,  Yu-Wen HUANG ,  Han HUANG

IPC: H04N19/70 ,  H04N19/64 ,  H04N19/66 ,  H04N19/89 ,  H04N19/174

Abstract: In one method, the current block is partitioned into multiple final sub-blocks using one or more stages of sub-tree partition comprising ternary tree partition and at least one other-type partition, where ternary partition tree is excluded from the sub-tree partition if a current sub-tree depth associated with a current sub-block is greater than a first threshold and the first threshold is an integer greater than or equal to 1. In another method, if a test condition is satisfied, the current block is encoded or decoded using a current Inter mode selected from a modified group of Inter tools, where the modified group of Inter tools is derived from an initial group of Inter tools by removing one or more first Inter tools from the initial group of Inter tools, replacing one or more second Inter tools with one or more complexity-reduced Inter tools, or both.

公开(公告)号：US20200344491A1

公开(公告)日：2020-10-29

申请号：US16924478

申请日：2020-07-09

Applicant: MEDIATEK INC.

Inventor： Ching-Yeh CHEN ,  Tzu-Der CHUANG ,  Chih-Wei HSU ,  Yu-Wen HUANG

IPC: H04N19/577 ,  H04N19/109 ,  H04N19/176 ,  H04N19/513 ,  H04N19/523 ,  H04N19/537 ,  H04N19/44 ,  H04N19/52

Abstract: A method of video coding using generalized bi-prediction (GBi) receives input data associated with a current block in a current picture, wherein the input data comprises information associated with a block size of the current block, determines a set of weighting factor pairs, wherein a size of the set of weighting factor pairs depends on the block size of the current block, and derives a set of advanced motion vector prediction (AMVP) candidate lists comprising MVP (motion vector prediction) candidates. The method further derives a set of final motion information based on the MVP candidates, determines that the set of final information comprises a bi-prediction predictor, generates a final predictor by combining two reference blocks associated with the final motion information using a target weighting factor pair selected from the set of weighting factor pairs, and encodes or decoding the current block using the final predictor.

公开(公告)号：US20200014948A1

公开(公告)日：2020-01-09

申请号：US16503758

申请日：2019-07-05

Applicant: MEDIATEK INC.

Inventor： Chen-Yen LAI ,  Tzu-Der CHUANG ,  Ching-Yeh CHEN ,  Chih-Wei HSU

IPC: H04N19/46 ,  H04N19/172 ,  H04N19/70 ,  H04N19/139 ,  H04N19/107 ,  H04N19/436

Abstract: A method of video decoding at a decoder can include receiving a bitstream including encoded data of a picture, decoding a plurality of coding units (CUs) in the picture based on motion information stored in a history-based motion vector prediction (HMVP) table without updating the HMVP table, and updating the HMVP table with motion information of all or a part of the plurality of CUs after the plurality of CUs are decoded based on the motion information stored in the HMVP table.

公开(公告)号：US20190132606A1

公开(公告)日：2019-05-02

申请号：US16168724

申请日：2018-10-23

Applicant: MEDIATEK INC.

Inventor： Yu-Chi SU ,  Chen-Yen LAI ,  Ching-Yeh CHEN

IPC: H04N19/513 ,  H04N19/44 ,  H04N19/119 ,  H04N19/176

Abstract: Aspects of the disclosure provide a method and an apparatus for video coding. A processing circuitry determines a process unit size for a decoder-side motion vector refinement (DMVR). Then, the processing circuitry enables an application of the DMVR on a current block when a size of the current block is smaller than or equal to the process unit size; and disables the application of the DMVR on the current block when the size of the current block is larger than the process unit size. In an example, the application of the DMVR refines the motion vectors with or without a template block.