公开(公告)号：US20230232012A1

公开(公告)日：2023-07-20

申请号：US18064434

申请日：2022-12-12

Applicant: MEDIATEK INC.

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

IPC: H04N19/137 ,  H04N19/105 ,  H04N19/176

CPC classification number: H04N19/137 ,  H04N19/105 ,  H04N19/176

Abstract: Methods and apparatus for video coding using non-adjacent affine candidates are provided. According to this method, one or more neighboring MVs (motion vectors) are determined from one or more non-adjacent affine-coded neighbors of the current block. CPMVs (Control-Point Motion Vectors) are determined based on said one or more neighboring MVs, wherein if a target neighboring block associated with one target neighboring MV (Motion Vector) is outside an available region, a derived CPMV) is generated to replace the target neighboring MV. An affine merge list or an affine AMVP (Advanced Motion Vector Prediction) list having said one or more neighboring MVs as one non-adjacent affine candidate is generated, wherein said one non-adjacent affine candidate generates a non-adjacent affine predictor using motion information according to the CPMVs. The current block is encoded or decoded using a motion candidate selected from the affine merge list or the affine AMVP list.

公开(公告)号：US20230199196A1

公开(公告)日：2023-06-22

申请号：US17702396

申请日：2022-03-23

Applicant: MEDIATEK INC.

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

IPC: H04N19/154 ,  H04N19/103 ,  H04N19/18 ,  H04N19/176

CPC classification number: H04N19/154 ,  H04N19/103 ,  H04N19/18 ,  H04N19/176

Abstract: Video encoding methods and apparatuses for frequency domain mode decision include receiving residual data of a current block, testing multiple coding modes on the residual data, calculating a distortion associated with each of the coding modes in a frequency domain, performing a mode decision to select a best coding mode from the tested coding modes according to the distortion calculated in the frequency domain, and encoding the current block based on the best coding mode.

公开(公告)号：US20230065083A1

公开(公告)日：2023-03-02

申请号：US17552963

申请日：2021-12-16

Applicant: MEDIATEK INC.

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

IPC: H04N19/119 ,  H04N19/159 ,  H04N19/169 ,  H04N19/186 ,  H04N19/176 ,  H04N19/105

Abstract: Low-latency video coding methods and apparatuses include receiving input data associated with a current Intra slice composed of Coding Tree Units (CTU), where each CTU includes luma and chroma Coding Tree Blocks (CTBs), partitioning each CTB into non-overlapping pipeline units, and encoding or decoding the CTUs in the current Intra slices by performing processing of chroma pipeline units after beginning processing of luma pipeline units in at least one pipeline stage. Each of the pipeline units is processed by one pipeline stage after another pipeline stage, and different pipeline stages process different pipeline units simultaneously. The pipeline stage in the low-latency video coding methods and apparatuses simultaneously processes one luma pipeline unit and at least one previous chroma pipeline unit within one pipeline unit time interval.

公开(公告)号：US20220210439A1

公开(公告)日：2022-06-30

申请号：US17601964

申请日：2020-04-10

Applicant: MEDIATEK INC.

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

IPC: H04N19/159 ,  H04N19/176 ,  H04N19/139 ,  H04N19/167 ,  H04N19/61 ,  H04N19/109 ,  H04N19/172 ,  H04N19/12 ,  H04N19/182 ,  H04N19/105

Abstract: Methods and apparatus of for video coding using sub-block based affine mode are disclosed. In one method, if affine fallback is used or the control-point motion vectors are the same, the sub-block based affine mode is disabled in order to reduce computational complexity. According to another method for video coding using a coding tool belonging to a coding tool group comprising Prediction Refinement with Optical Flow (PROF) and Bi-Directional Optical Flow (BDOF), predictor refinement is derived for pixels of a target subblock of the current block, where a step to derive the predictor refinement comprises to derive gradients for the pixels of the target subblock of the current block and to right-shift the first gradients by a common shift.

公开(公告)号：US20220182633A1

公开(公告)日：2022-06-09

申请号：US17436836

申请日：2020-03-13

Applicant: MEDIATEK INC.

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

IPC: H04N19/132 ,  H04N19/30 ,  H04N19/186 ,  H04N19/176

Abstract: A method and apparatus of video decoding are disclosed. According to one method, the chroma residue scaling factors are derived based on neighboring prediction or reconstructed luma samples of the collocated luma block, where the neighboring prediction or reconstructed luma samples of the collocated luma block correspond to samples among M samples along a top boundary of the collocated luma block and N samples along a left boundary of the collocated luma block. Chroma scaling is applied to chroma residual samples of the chroma residual block according to the chroma residue scaling factors derived. In another method, the chroma residue scaling factors are derived based on one or more reconstructed luma samples outside the collocated luma processing data unit. In another method, the chroma residue scaling factors are signaled in or parsed from APS (Adaptation Parameter Set) of the bitstream.

公开(公告)号：US20220124319A1

公开(公告)日：2022-04-21

申请号：US17567313

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

Abstract: Video processing methods comprise receiving input data of a current block in a current picture having a plurality of Virtual Pipeline Data Units (VPDUs), wherein each VDPU is a fixed size, performing a decoding process to decode Coding Units (CUs) in the current VPDU and generate decoded samples of the current VPDU, wherein each CU coded in a Current Picture Referencing (CPR) mode is decoded by fetching decoded samples in a reference block stored in a CPR referring buffer, and updating the CPR referring buffer by storing the decoded samples of the current VPDU when finishing the decoding process of the current VPDU, wherein the CPR referring buffer is updated one VPDU by one VPDU.

公开(公告)号：US20220094936A1

公开(公告)日：2022-03-24

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 ,  H04N19/61 ,  H04N19/176 ,  H04N19/18 ,  H04N19/70 ,  H04N19/132 ,  H04N19/186

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：US20220060735A1

公开(公告)日：2022-02-24

申请号：US17435440

申请日：2020-03-02

Applicant: MEDIATEK INC.

Inventor： Ching-Yeh CHEN ,  Tzu-Der CHUANG

IPC: H04N19/513 ,  H04N19/105 ,  H04N19/132 ,  H04N19/159 ,  H04N19/176

Abstract: Exemplary video processing methods and apparatuses for encoding or decoding a current block by bi-directional prediction are disclosed. L0 and L1 reference blocks are determined for the current block, and a motion vector refinement is applied to refine the L0 and L1 reference blocks using a motion estimation search performed on each processing unit in the current block. A bi-directional optical flow operation is early terminated according to a cost of each processing unit in the current block. The processing units for cost calculation in the motion vector refinement and the bi-directional optical flow early termination are unified. The bi-directional optical flow operation is applied to the current block to further refine the L0 and L1 reference blocks if the bi-directional optical flow operation is not early terminated. A final inter predictor is derived from the refined L0 and L1 reference blocks for encoding or decoding the current block.

公开(公告)号：US20210400311A1

公开(公告)日：2021-12-23

申请号：US16903453

申请日：2020-06-17

Applicant: MEDIATEK INC.

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

IPC: H04N19/90 ,  H04N19/80 ,  H04N19/176

Abstract: Methods and apparatus of video processing for a video coding system using Neural Network (NN) are disclosed. According to this method, a shifted region is determined for the filter region to avoid unavailable reconstructed or filtered-reconstructed video data for the NN processing of the filter region, where boundaries of the shifted region comprises region boundaries derived by shifting target boundaries upward, leftward, or both upward and leftward, and wherein the target boundaries correspond to one or more top boundaries and one or more left boundaries of target processing region including the current block and one or more remaining un-processed blocks. According to another method, the areas outside boundaries of pictures, slices, tiles, or tile groups are padded. In yet another method, a flag is used to indicate whether the NN processing is allowed to cross a boundary between two slices, two tiles or two tile groups.

公开(公告)号：US20210392322A1

公开(公告)日：2021-12-16

申请号：US17292184

申请日：2019-11-12

Applicant: MEDIATEK INC.

Inventor： Man-Shu CHIANG ,  Chih-Wei HSU ,  Tzu-Der CHUANG ,  Ching-Yeh CHEN

IPC: H04N19/105 ,  H04N19/51 ,  H04N19/176 ,  H04N19/172 ,  H04N19/119

Abstract: A method and apparatus of prediction for video coding using MH (Multiple Hypothesis) mode are disclosed. According to this method, a block is partitioned into a first partition and a second partition. A first candidate and a second candidate are derived for the first and second partitions respectively. At least one of the first candidate and the second candidate is derived using a candidate list derived for a regular Merge mode (or also called as normal Merge mode). An MH prediction generated by blending a first prediction corresponding to a first candidate and a second prediction corresponding to a second candidate, and the MH prediction is applied to a part of the current block.