公开(公告)号：US20210203943A1

公开(公告)日：2021-07-01

申请号：US17057349

申请日：2019-05-24

Applicant: MEDIATEK INC.

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

IPC: H04N19/137 ,  H04N19/105 ,  H04N19/159 ,  H04N19/176

Abstract: Method and apparatus for coding system using affine motion model are disclosed. According to one method, a neighbouring block set of the current block comprising multiple spatial neighbouring blocks and one or more collocated blocks is determined for the current block. One or more constructed affine MVP candidates are derived for an affine MVP candidate list based on CP (control-point) MVs (motion vectors) at multiple spatial neighbouring blocks and said one or more collocated blocks. One constructed affine MVP candidate without one temporal MV is checked and inserted into the affine MVP candidate list before any constructed affine MV with one temporal MV. The current block or motion information of the current block is then encoded or decoded based on the affine MVP candidate list.

公开(公告)号：US20210195203A1

公开(公告)日：2021-06-24

申请号：US17249667

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：US20210185306A1

公开(公告)日：2021-06-17

申请号：US17121927

申请日：2020-12-15

Applicant: MEDIATEK INC.

Inventor： Tzu-Der CHUANG ,  Chih-Wei HSU ,  Ching-Yeh CHEN ,  Lulin CHEN

IPC: H04N19/105 ,  H04N19/159 ,  H04N19/186 ,  H04N19/187 ,  H04N19/573

Abstract: Method and apparatus of video coding using a multi-layer prediction mode, are disclosed. According to one method, a bitstream is generated at an encoder side or received at a decoder side, where the bitstream corresponds to coded data of current video data in a current layer. The bitstream complies with a bitstream conformance requirement corresponding both the bit depth values for the current layer and the reference layer being the same and the chroma format index values for the current layer and the reference layer being the same. The current video data in the current layer is then encoded or decoded by utilizing reference video data in the reference layer.

公开(公告)号：US20210056390A1

公开(公告)日：2021-02-25

申请号：US16963566

申请日：2019-01-22

Applicant: MEDIATEK INC.

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

IPC: G06N3/04 ,  H04N19/42

Abstract: A method and apparatus of signal processing using a grouped neural network (NN) process are disclosed. A plurality of input signals for a current layer of NN process are grouped into multiple input groups comprising a first input group and a second input group. The neural network process for the current layer is partitioned into multiple NN processes comprising a first NN process and a second NN process. The first NN process and the second NN process are applied to the first input group and the second input group to generate a first output group and a second output group for the current layer of NN process respectively. In another method, the parameter set associated with a layer of NN process is coded using different code types.

公开(公告)号：US20200344468A1

公开(公告)日：2020-10-29

申请号：US16850210

申请日：2020-04-16

Applicant: MEDIATEK INC.

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

IPC: H04N19/105 ,  H04N19/593 ,  H04N19/176 ,  H04N19/137

Abstract: An intra prediction method includes receiving input data of a current block in a current picture, deriving reference samples of the current block from boundary samples, selecting a matrix for the current block, generating intermediate predicted samples by multiplying the reference samples and the matrix, and clipping the intermediate predicted samples before up-sampling. The intra prediction method further includes performing an up-sampling process on the clipped intermediate predicted samples to generate predicted samples for the current block, and encoding or decoding the current block according to the predicted samples of the current block.

公开(公告)号：US20200322599A1

公开(公告)日：2020-10-08

申请号：US16304209

申请日：2017-05-26

Applicant: MEDIATEK INC.

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

IPC: H04N19/105 ,  H04N19/176 ,  H04N19/70 ,  H04N19/513 ,  H04N19/159

Abstract: A method and apparatus for a video coding system with the current picture referencing (CPR) mode enabled are disclosed. According to one method, if one reference picture index for the current block points to the current image, the affine motion compensation is inferred as Off for the current block without a need for signalling or parsing an affine mode syntax or the adaptive MV resolution is inferred as On for the current block without a need for signalling or parsing an adaptive motion vector resolution syntax. In another method, if the affine mode is used for the current block or if the adaptive MV resolution is not used for the current block, a reference picture index for the current block is signalled or parsed and the reference picture index always points to one reference picture other than the current image.

公开(公告)号：US20200304794A1

公开(公告)日：2020-09-24

申请号：US16825175

申请日：2020-03-20

Applicant: MEDIATEK INC.

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

IPC: H04N19/126 ,  H04N19/176 ,  H04N19/172 ,  H04N19/60 ,  H04N19/30

Abstract: A method and apparatus for video coding are disclosed. According to the present invention, a flag is determined, where the flag indicates whether a scaling matrix is enabled or not enabled for non-separable secondary transform (NSST) coded blocks. When the current block is one NSST coded block and the flag indicates that the scaling matrix is enabled for the NSST blocks, the scaling matrix is determined and applied to the current block. When the current block is one NSST coded block and the flag indicates that the scaling matrix is not enabled for the NSST coded blocks, the scaling matrix is skipped for the current block. According to another method, for a rectangular block, a target scaling matrix is generated directly from a square base scaling matrix in one step without up-sampling-and-down-sampling or down-sampling-and-up-sampling.

公开(公告)号：US20200228832A1

公开(公告)日：2020-07-16

申请号：US16738288

申请日：2020-01-09

Applicant: MEDIATEK INC.

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

IPC: H04N19/593

Abstract: Method and apparatus for constrained de-blocking filter are disclosed. According to one method, a current block is partitioned into a plurality of sub-blocks using SDIP (Short Distance Intra Prediction mod). A first Bs (boundary strength) for an internal block boundary of the plurality of sub-blocks is determined by setting the first Bs to a second Bs of an Intra-coded boundary block of the current block. De-blocking process is applied, using the first Bs, to reconstructed samples across the internal block boundary of the plurality of sub-blocks to generate filtered-reconstructed samples. In another method, the current block is partitioned into two sub-blocks using SBT (sub-block transform) horizontally or vertically and the first Bs (boundary strength) is determined for an internal block boundary between the two sub-blocks by setting the first Bs to a second Bs of a non-zero cbf (coded block flag) block of the two sub-blocks in step.

公开(公告)号：US20200186802A1

公开(公告)日：2020-06-11

申请号：US16629440

申请日：2018-07-12

Applicant: MEDIATEK INC.

Inventor： Tzu-Der CHUANG ,  Ching-Yeh CHEN

IPC: H04N19/13

Abstract: A method and apparatus of entropy coding of coding symbols using Context-Based Adaptive Binary Arithmetic Coder (CABAC) are disclosed. According to the present invention, a math formula is used for calculating the LPS range for deriving rangeOne value and rangeZero value. For example, the LPS range is derived using one or more mathematical operations comprising calculating a multiplication of a first value and a second value, in which the first value is related to (2*the LPS probability index+1) or the LPS probability index, while the second value is related to (2*the range index+1) or the range index. Besides, the LPS range can be derived by using a look-up-table including table contents corresponding to values of LPS range associated with a set of LPS probability indexes and a set of range indexes for encoding or decoding a binary value of the current bin.

公开(公告)号：US20190320199A1

公开(公告)日：2019-10-17

申请号：US16471689

申请日：2017-12-19

Applicant: MEDIATEK INC.

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

IPC: H04N19/577 ,  H04N19/513 ,  H04N19/105 ,  H04N19/159 ,  H04N19/117 ,  H04N19/176

Abstract: Method and apparatus of using Pattern-based MV derivation (PMVD), Bi-directional optical flow (BIO) or Decoder-side MV refinement (DMVR) to refine motion for a bi-direction predicted block are disclosed. According to one method of the present invention, a first and a second motion-compensated reference blocks associated with the current block in a first and a second reference pictures from reference picture list 0 and list 1 are determined respectively. The PMVD process, BIO process or DMVR process is applied to generate motion refinement for the current block using reference data corresponding to the first motion-compensated reference block and the second motion-compensated reference block without other reference data outside the first motion-compensated reference block and the second motion-compensated reference block so as to reduce required system memory bandwidth. Also an adaptive block size method for block-based BIO is disclosed.