公开(公告)号：US20210274218A1

公开(公告)日：2021-09-02

申请号：US17326421

申请日：2021-05-21

Applicant: MEDIATEK INC.

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

IPC: H04N19/577 ,  H04N19/70

Abstract: A method and apparatus use an Inter coding tool and OBMC (Overlapped Block Motion Compensation). According to one implementation, a method of video coding using OBMC (Overlapped Block Motion Compensation) operates by receiving input data associated with a current block, wherein the input data correspond to pixel data to be coded at an encoder side or coded data to be decoded at a decoder side, applying the OBMC to the current block depending on one or more constraints, and signaling an OBMC syntax conditionally at the encoder side or parsing the OBMC syntax conditionally at the decoder side for the current block, wherein the OBMC syntax indicates whether the OBMC is applied to the current block.

公开(公告)号：US20210250604A1

公开(公告)日：2021-08-12

申请号：US17251008

申请日：2019-06-10

Applicant: MEDIATEK INC.

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

IPC: H04N19/52 ,  H04N19/577 ,  H04N19/174

Abstract: Method and apparatus of using Bi-directional optical flow (BIO) for a true bi-direction predicted block are disclosed. According to one method of the present invention, the gradients are limited to a predefined bit-depth in order to reduce the computational complexity. According to another method, the data range of gradient sum and/or the difference between L0 and L1 interpolated pixels are shifted by a predefined bit-depth. The pre-defined bit-depth can be implicitly determined or signalled in a bit stream at a sequence level, picture level or slice level. The pre-defined bit-depth can also be determined dependent on input bit-depth.

公开(公告)号：US20210160527A1

公开(公告)日：2021-05-27

申请号：US17041655

申请日：2019-04-02

Applicant: MEDIATEK INC.

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

IPC: H04N19/513 ,  H04N19/105 ,  H04N19/119 ,  H04N19/159 ,  H04N19/176

Abstract: Video processing methods and apparatuses for coding a current block comprise receiving input data of a current block, partitioning the current block into multiple sub-blocks, deriving sub-block MVs for the current block according to a sub-block motion compensation coding tool, constraining the sub-block MVs to form constrained sub-block MVs, and encoding or decoding the current block using the constrained sub-block MVs. The sub-block MVs may be constrained according to a size, width, or height of the current block or a sub-block, an inter prediction direction of one of control point MVs of the current block, the current block, or current sub-block, the control point MVs, or a combination of the above.

公开(公告)号：US20210120269A1

公开(公告)日：2021-04-22

申请号：US16494586

申请日：2018-03-13

Applicant: MEDIATEK INC.

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

IPC: H04N19/60 ,  H04N19/176 ,  H04N19/18 ,  H04N19/122

Abstract: A method and apparatus for video coding incorporating enhanced multiple transform (EMT) are disclosed. According to one method, the number of candidates for EMT in the horizontal direction or vertical direction is reduced depending on the current block size. According to another method, an EMT flag, one or more EMT indices or both are signalled only if the total number of non-zero coefficients in at least a part of the 2D coefficient block is greater than a threshold, where the threshold is equal to 1 or larger. A method and apparatus for video coding using non-separable secondary transform (NSST) are disclosed. According to this method, a total number of non-zero first coefficients in a partial block of the 2D coefficient block is determined and used to determine whether to apply the NSST process.

公开(公告)号：US20210092394A1

公开(公告)日：2021-03-25

申请号：US17048208

申请日：2019-04-17

Applicant: MEDIATEK INC.

Inventor： Chia-Ming TSAI ,  Chih-Wei HSU ,  Tzu-Der CHUANG ,  Ching-Yeh CHEN ,  Shih-Ta HSIANG ,  Yu-Wen HUANG ,  Zhi-Yi LIN

IPC: H04N19/132 ,  H04N19/119 ,  H04N19/176 ,  H04N19/70 ,  H04N19/96 ,  H04N19/172 ,  H04N19/61 ,  H04N19/46 ,  H04N19/159 ,  H04N19/186

Abstract: A method and apparatus for video coding using block partition are disclosed. According to the present invention, a partition structure corresponding to recursively partitioning a current block into smaller TU (transform unit) blocks until the partition structure reaches a maximum allowed split depth or until a block size of at least one of smaller TU blocks is a supported core transform size, where the current block is partitioned into final smaller TU blocks according to the partition structure. A transform coding process is applied to the current block according to the partition structure, where the transform coding process is skipped for at least one of the final smaller TU blocks. A flag can be signalled for the current block to indicate whether the current block is allowed to skip the transform coding process for said at least one of the final smaller TU blocks.

公开(公告)号：US20210084295A1

公开(公告)日：2021-03-18

申请号：US17021050

申请日：2020-09-15

Applicant: MEDIATEK INC.

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

IPC: H04N19/117 ,  H04N19/82 ,  H04N19/186

Abstract: Methods and apparatus for cross-colour loop-filter processing of reconstructed video are disclosed. According to one method, a sum of filter coefficients for each of one or more candidate cross-colour loop filters is constrained to be a fixed value. One or more syntax elements indicating a value related to a total number of candidate filters in a filter set are signalled or parsed in the APS (Adaptation Parameter Set).

公开(公告)号：US20210076061A1

公开(公告)日：2021-03-11

申请号：US17047443

申请日：2019-04-15

Applicant: MEDIATEK INC.

Inventor： Zhi-Yi LIN ,  Tzu-Der CHUANG ,  Chun-Chia CHEN ,  Ching-Yeh CHEN ,  Chih-Wei HSU ,  Yu-Wen HUANG

IPC: H04N19/52 ,  H04N19/583 ,  H04N19/105 ,  H04N19/137 ,  H04N19/159 ,  H04N19/186 ,  H04N19/176

Abstract: Exemplary video processing methods and apparatuses for coding a current block by overlapped sub-block motion compensation split the current block into overlapped sub-blocks, determine a sub-block MV for each overlapped sub-block, derive an initial predictor for each sub-block by motion compensation using the sub-block MV, derive a final predictor for each overlapped region by blending the initial predictors of the overlapped region, and encode or decode the current block based on the final predictors. Exemplary video processing methods and apparatuses for coding blocks with OBMC generate a converted MV by changing a MV to an integer MV or changing a MV component to an integer component, derive an OBMC region by motion compensation using the converted MVs, and encode or decode the blocks by blending an OBMC predictor with an original predictor.

公开(公告)号：US20210067771A1

公开(公告)日：2021-03-04

申请号：US16962900

申请日：2019-01-24

Applicant: MEDIATEK INC.

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

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

Abstract: Methods and apparatus of Inter prediction for video coding including affine Inter mode are disclosed. In one method, an affine MVP candidate list is generated, wherein the affine MVP candidate list comprises at least one inherited affine MVP derived from a neighbouring block set. Prediction differences of a current control-point MV set associated with the affine motion model are encoded using one predictor selected from the affine MVP candidate list at the video encoder side or the prediction differences of the current control-point MV set associated with the affine motion model are decoded at the video decoder side using one predictor selected from the affine MVP candidate list. In another method, the inherited affine MVP is derived by considering whether at least one of reference picture lists of said at least one neighbouring block includes one reference picture being the same as a current reference picture of the current block.

公开(公告)号：US20210051345A1

公开(公告)日：2021-02-18

申请号：US17051269

申请日：2019-04-29

Applicant: MEDIATEK INC.

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

IPC: H04N19/85 ,  H04N19/159 ,  H04N19/176 ,  H04N19/52 ,  H04N19/96 ,  H04N19/139

Abstract: A video coder that implements illumination compensation is provided. The video coder receives a first block of pixels in a first video picture to be coded as a current block, wherein the current block is associated with a motion vector that references a second block of pixels in a second video picture as a reference block. The video coder performs inter-prediction for the current block by using the motion vector to generate a set of motion-compensated pixels for the current block. The video coder modifies the set of motion-compensated pixels of the current block by applying a linear model that is computed based on neighboring samples of the reference block and of the current block. The neighboring samples are identified based on a position of the current block within a larger block.

公开(公告)号：US20200336755A1

公开(公告)日：2020-10-22

申请号：US16920209

申请日：2020-07-02

Applicant: MEDIATEK INC.

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

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

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, resetting the HMVP table for every N CTU rows. The method also provides updating the HMVP table with the motion information of the last Q of the plurality of CUs.