公开(公告)号：US20200213593A1

公开(公告)日：2020-07-02

申请号：US16726924

申请日：2019-12-25

Applicant: MediaTek Inc.

Inventor： Man-Shu Chiang ,  Chun-Chia Chen ,  Chih-Wei Hsu

IPC: H04N19/137 ,  H04N19/105 ,  H04N19/30 ,  H04N19/176

Abstract: A video coder receives data from a bitstream for a block of pixels to be encoded or decoded as a current block of a current picture of a video. Upon determining that an applied block setting of the current block satisfies a threshold condition, the video coder generates a first prediction based on a first motion information for a first prediction unit of the current block. The video coder generates a second prediction based on a second motion information for a second prediction unit of the current block. The video coder generates a third prediction based on the first and second motion information for an overlap prediction region that is defined based on a partitioning between the first prediction unit and the second prediction unit. The video coder encodes or decodes the current block by using the first, second, and third predictions.

公开(公告)号：US20190327482A1

公开(公告)日：2019-10-24

申请号：US16392040

申请日：2019-04-23

Applicant: MediaTek Inc.

Inventor： Zhi-Yi Lin ,  Tzu-Der Chuang ,  Ching-Yeh Chen ,  Man-Shu Chiang ,  Chih-Wei Hsu

IPC: H04N19/513 ,  H04N19/176

Abstract: A video coder implementing affine prediction is provided. The video coder receives input data associated with a current block to be coded. The video coder derives a control point motion vector (CPMV) of the current block according to an affine model. The video coder derives a set of motion compensation motion vectors (MCMVs) for a set of sub-blocks of the current block based on the derived CPMV of the current block according to the affine model. The video coder performs motion compensation for the current block based on the set of MCMVs. The CPMV of the current block is derived based on a CPMV of a first reference block that is a neighboring block located in a same region of the current block or an MCMV of a second reference block that is not a neighboring block located in the same region of the current block.

公开(公告)号：US20190052886A1

公开(公告)日：2019-02-14

申请号：US16047506

申请日：2018-07-27

Applicant: MediaTek Inc.

Inventor： Man-Shu Chiang ,  Chih-Wei Hsu

IPC: H04N19/139 ,  H04N19/109 ,  H04N19/176 ,  H04N19/105 ,  H04N19/159 ,  H04N19/196 ,  H04N19/107

Abstract: A combined prediction mode for encoding or decoding a pixel block of a video picture is provided. When it is determined that the combined prediction mode is used, a video codec generates an intra predictor for the current block based on a selected intra-prediction mode and a merge-indexed predictor for the current block based on a selected merge candidate from a merge candidates list. The video codec then generates a final predictor for the current block based on the intra predictor and the merge-indexed predictor. The final predictor is then used to encode or decode the current block.

公开(公告)号：US20180302631A1

公开(公告)日：2018-10-18

申请号：US15946765

申请日：2018-04-06

Applicant: MediaTek Inc.

Inventor： Man-Shu Chiang ,  Chih-Wei Hsu ,  Tzu Der Chuang ,  Ching-Yeh Chen

IPC: H04N19/176 ,  H04N19/124 ,  H04N19/61 ,  H04N19/122

Abstract: A method and apparatus related to secondary transform operations. In which, the non-zero transform coefficients in a particular subset of the transform coefficients of the block of pixels is counted and compared with a particular threshold so as to determine whether or not to perform the secondary transform on the block of pixels. Besides, the optimal secondary transform kernel size is derived implicitly based on the size of the block, or derived explicitly based on a flag coded by using an adaptive code word.

公开(公告)号：US12160569B2

公开(公告)日：2024-12-03

申请号：US17609707

申请日：2020-05-06

Applicant: MEDIATEK INC.

Inventor： Man-Shu Chiang ,  Chih-Wei Hsu ,  Tzu-Der Chuang ,  Ching-Yeh Chen ,  Yu-Wen Huang ,  Shih-Ta Hsiang

IPC: H04N19/11 ,  H04N19/159 ,  H04N19/176 ,  H04N19/186

Abstract: A method and apparatus of prediction for video coding are disclosed. According to one method, a luma Intra prediction mode is determined for a corresponding luma block collocated with the current chroma block, where a predefined mode is assigned to the luma Intra prediction mode when the corresponding luma block collocated with the current chroma block satisfies one or more conditions. A chroma Intra prediction mode is determined for the current chroma block according to the luma Intra prediction mode. The current chroma block is then encoded or decoded according to the chroma Intra prediction mode. According to another method, a predefined mode is assigned to Intra prediction mode for the current block when the current block satisfies one or more conditions. The current block is then encoded or decoded according to the Intra prediction mode.

公开(公告)号：US12047596B2

公开(公告)日：2024-07-23

申请号：US17426077

申请日：2020-01-22

Applicant: MEDIATEK INC.

Inventor： Man-Shu Chiang ,  Chih-Wei Hsu ,  Tzu-Der Chuang ,  Ching-Yeh Chen

IPC: H04N19/513 ,  H04N19/119 ,  H04N19/176 ,  H04N19/593

CPC classification number: H04N19/513 ,  H04N19/119 ,  H04N19/176 ,  H04N19/593

Abstract: A method and apparatus of prediction for video coding are disclosed. According to one method, a block is partitioned into a first and second regions using a target partition selected from a partition set comprising triangle partition. A Merge candidate list is determined for a partitioned current block by including at least one HMVP (history-based motion vector prediction) candidate from an HMVP buffer, where the HMVP buffer stores motion information of previously coded blocks. The partitioned current block or current motion information associated with the partitioned current block are encoded or decoded using the Merge candidate list, where the Merge candidate list is used to derive a first candidate for the first region and a second candidate for the second region. In another method, whether to apply triangular CIIP (combined Inter/Intra prediction) to the current block is signaled at an encoder side or parsed at a decoder side.

公开(公告)号：US11997311B2

公开(公告)日：2024-05-28

申请号：US17267124

申请日：2019-09-17

Applicant: MEDIATEK INC.

Inventor： Man-Shu Chiang ,  Chih-Wei Hsu

IPC: H04N19/56 ,  H04N19/176 ,  H04N19/517

CPC classification number: H04N19/56 ,  H04N19/176 ,  H04N19/517

Abstract: Video processing methods and apparatuses for coding a current block generate a final predictor by combining multiple predictors of the current block. One of the predictors for the current block is a motion compensated predictor, which is generated according to one candidate selected from a first candidate list. The construction of the first candidate list includes deriving an average candidate by averaging motion information of existing candidates in the first candidate list. A second predictor for the current block is another motion compensated predictor or an intra predictor.

公开(公告)号：US11991393B2

公开(公告)日：2024-05-21

申请号：US17604149

申请日：2020-04-15

Applicant: MEDIATEK INC.

Inventor： Man-Shu Chiang ,  Chih-Wei Hsu ,  Tzu-Der Chuang ,  Ching-Yeh Chen

IPC: H04N19/61 ,  H04N19/11 ,  H04N19/122 ,  H04N19/132 ,  H04N19/159 ,  H04N19/176 ,  H04N19/18 ,  H04N19/186

CPC classification number: H04N19/61 ,  H04N19/11 ,  H04N19/122 ,  H04N19/159 ,  H04N19/176 ,  H04N19/18 ,  H04N19/132 ,  H04N19/186

Abstract: Video processing methods and apparatuses in a video encoding or decoding system for transforming residuals of transform blocks into final transform coefficients or inverse transforming final transform coefficients into residuals. In order to solve the latency issue, exemplary embodiments check if a width or height of a coding block is larger than a predefined threshold, and disable secondary transform or inverse secondary transform for any transform block within the coding block if the width or height of the coding block is larger than the predefined threshold. Another embodiment checks if there are multiple transform blocks in a coding block, and disables secondary transform or inverse secondary transform if the coding block contains multiple transform blocks.

公开(公告)号：US11943476B2

公开(公告)日：2024-03-26

申请号：US17603484

申请日：2020-04-15

Applicant: MEDIATEK INC.

Inventor： Man-Shu Chiang ,  Chih-Wei Hsu ,  Tzu-Der Chuang ,  Ching-Yeh Chen

IPC: H04N19/60 ,  H04N19/12 ,  H04N19/167 ,  H04N19/176 ,  H04N19/18 ,  H04N19/186 ,  H04N19/70

CPC classification number: H04N19/60 ,  H04N19/12 ,  H04N19/167 ,  H04N19/176 ,  H04N19/18 ,  H04N19/186 ,  H04N19/70

Abstract: Video processing methods and apparatuses implemented in a video encoding or decoding system with conditional secondary transform signaling. The video encoding system determines and applies a transform operation to residuals of one or more transform blocks to generate final transform coefficients, and skip signaling a secondary transform index if a position of a last significant coefficient in each considered transform block is less than or equal to a predefined position; otherwise, the video encoding system signals a secondary transform index according to the transform operation. The video decoding system parses last significant coefficient position syntax of each considered transform block to determine a position of a last significant coefficient, and infers inverse secondary transform is not applied if the positions of the last significant coefficients are less than or equal to the predefined position; otherwise, the video decoding system determines an inverse transform operation by parsing a secondary transform index.

公开(公告)号：US11924413B2

公开(公告)日：2024-03-05

申请号：US18117855

申请日：2023-03-06

Applicant: MediaTek Inc.

Inventor： Man-Shu Chiang ,  Chih-Wei Hsu

IPC: H04N7/12 ,  H04N19/105 ,  H04N19/11 ,  H04N19/117 ,  H04N19/136 ,  H04N19/159 ,  H04N19/176 ,  H04N19/189 ,  H04N19/507

CPC classification number: H04N19/11 ,  H04N19/105 ,  H04N19/117 ,  H04N19/136 ,  H04N19/159 ,  H04N19/176 ,  H04N19/189 ,  H04N19/507

Abstract: A video decoder that decodes a current block of pixels by using multi-hypothesis combined prediction mode is provided. The video decoder generates a first prediction of the current block based on an inter prediction mode. The video decoder enables the combined prediction mode for the current block based on a block size of the current block determined according to a width and a height of the current block. The combined prediction mode is disabled when the width of or the height of the current block is greater than a threshold length. When the combined prediction mode is enabled, the video decoder generates a second prediction based on an intra prediction mode that is inferred to be a planar mode, and subsequently a combined prediction for the current block based on the first prediction and the second prediction. The video decoder reconstructs the current block by using the combined prediction.