公开(公告)号：US20220159300A1

公开(公告)日：2022-05-19

申请号：US17603505

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 ,  H04N19/186 ,  H04N19/176 ,  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 a transform block to generate final transform coefficients, and adaptively signals a secondary transform index according to a position of a last significant coefficient in the transform block. A value of the secondary transform index is determined according to the transform operation. The video decoding system parses last significant coefficient position syntax of each transform block in the current block from a video bitstream to determine a position of a last significant coefficient for each transform block, and infers inverse secondary transform is not applied to the current block according to the positions of the last significant coefficients; otherwise, the video decoding system determines an inverse transform operation by parsing a secondary transform index from the video bitstream.

公开(公告)号：US20210314602A1

公开(公告)日：2021-10-07

申请号：US17267124

申请日：2019-09-17

Applicant: MEDIATEK INC.

Inventor： Man-Shu CHIANG ,  Chih-Wei HSU

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

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：US20220232205A1

公开(公告)日：2022-07-21

申请号：US17609702

申请日：2020-05-07

Applicant: MEDIATEK INC.

Inventor： Man-Shu CHIANG ,  Chih-Wei HSU ,  Tzu-Der CHUANG ,  Ching-Yeh CHEN ,  Yu-Wen HUANG ,  Shih-Ta HSIANG

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

Abstract: Method and apparatus of video coding are disclosed. According to one method, in the decoder side, a predefined Intra mode is assigned to a neighboring block adjacent to the current luma block when the neighboring block satisfies one or more conditions. An MPM (Most Probable Mode) list is derived based on information comprising at least one of neighboring Intra modes. A current Intra mode is derived utilizing the MPM list. The current luma block is decoded according to the current Intra mode According to another method, a predefined Intra mode is assigned to a neighboring block adjacent to the current luma block if the neighboring block is coded in BDPCM (Block-based Delta Pulse Code Modulation) mode, where the predefined Intra mode is set to horizontal mode or vertical mode depending on prediction direction used by the BDPCM mode.

公开(公告)号：US20220224891A1

公开(公告)日：2022-07-14

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 ,  H04N19/186 ,  H04N19/176

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：US20220201335A1

公开(公告)日：2022-06-23

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 ,  H04N19/176 ,  H04N19/18 ,  H04N19/122 ,  H04N19/159 ,  H04N19/11

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：US20220070456A1

公开(公告)日：2022-03-03

申请号：US17415313

申请日：2019-12-20

Applicant: MEDIATEK INC.

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

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

Abstract: A method and apparatus of Inter prediction for video coding using a target Merge mode comprising a triangle Merge mode are disclosed. According to this method, a current block is partitioned into a first region and a second region using the target partition. A candidate list is determined. Two candidates are determined for the two regions by deriving two target candidates from the candidate list. When a selected target candidate is a uni-prediction candidate, the selected target candidate is used as one candidate; and when the selected target candidate is a bi-prediction candidate, motion information associated of the selected target candidate with List 0 or List 1 is used as one candidate. The current block or current motion information associated with the current block is encoded or decoded according to the candidate list. The candidate list is used to derive the first candidate and the second candidate.

公开(公告)号：US20210392364A1

公开(公告)日：2021-12-16

申请号：US17283338

申请日：2019-10-09

Applicant: MEDIATEK INC.

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

IPC: H04N19/513 ,  H04N19/176

Abstract: Video processing methods and apparatuses for coding a current block generate a final predictor by combining multiple predictors for the current block. A first predictor and a second predictor for the current block are generated by applying one or a combination of settings to the first, second, or both predictors. One or both the first and second predictors are generated from motion compensation. The final predictor is derived from the first and second predictors, and the current block is encoded or decoded according to the final predictor. The settings include supported-mode setting, combined-weight setting, applied-portion setting, motion information setting, precision setting, or a combination of the above settings.

公开(公告)号：US20250056008A1

公开(公告)日：2025-02-13

申请号：US18720890

申请日：2022-12-20

Applicant: MEDIATEK INC.

Inventor： Yu-Ling HSIAO ,  Olena CHUBACH ,  Chun-Chia CHEN ,  Chia-Ming TSAI ,  Man-Shu CHIANG ,  Chih-Wei HSU ,  Tzu-Der CHUANG ,  Ching-Yeh CHEN ,  Yu-Wen HUANG

IPC: H04N19/159 ,  H04N19/132 ,  H04N19/176 ,  H04N19/186

Abstract: A video coding system that uses multiple models to predict chroma samples is provided. The video coding system receives data for a block of pixels to be encoded or decoded as a current block of a current picture of a video. The system constructs two or more chroma prediction models based on luma and chroma samples neighboring the current block. The system applies the two or more chroma prediction models to incoming or reconstructed luma samples of the current block to produce two or more model predictions. The system computes predicted chroma samples by combining the two or more model predictions. The system uses the predicted chroma samples to reconstruct chroma samples of the current block or to encode the current block.

公开(公告)号：US20230388546A1

公开(公告)日：2023-11-30

申请号：US17825269

申请日：2022-05-26

Applicant: MEDIATEK INC.

Inventor： Chih-Hsuan LO ,  Man-Shu CHIANG ,  Chun-Chia CHEN ,  Chih-Wei HSU ,  Tzu-Der CHUANG ,  Ching-Yeh CHEN ,  Yu-Wen HUANG

IPC: H04N19/625 ,  H04N19/122 ,  H04N19/176 ,  H04N19/18 ,  H04N19/124 ,  H04N19/423

CPC classification number: H04N19/625 ,  H04N19/122 ,  H04N19/176 ,  H04N19/18 ,  H04N19/124 ,  H04N19/423

Abstract: Video encoding methods and apparatuses in a video encoding system receive an input residual signal of a current block by a shared transform circuit, apply horizontal transform and vertical transform by a shared transform circuit to generate transform coefficients, apply quantization and inverse quantization to generate recovered transform coefficients, apply inverse vertical transform and inverse horizontal transform to the recovered transform coefficients by the shared transform circuit to generate a reconstructed residual signal for the current block, and encode the current block based on quantized levels of the current block. The shared transform circuit and a coefficient buffer in the folded 4-time transform architecture reuse computation resources in each transform stage. In some embodiments of the folded 4-time transform architecture, a hierarchical design for block size grouping is implemented with fixed throughput for uniform hardware scheduling.

公开(公告)号：US20230224455A1

公开(公告)日：2023-07-13

申请号：US18065179

申请日：2022-12-13

Applicant: MEDIATEK INC.

Inventor： Man-Shu CHIANG ,  Chun-Chia CHEN ,  Chih-Wei HSU ,  Shih-Ta HSIANG ,  Ching-Yeh CHEN ,  Tzu-Der CHUANG ,  Yu-Wen HUANG

IPC: H04N19/105 ,  H04N19/176 ,  H04N19/139 ,  H04N19/70

CPC classification number: H04N19/105 ,  H04N19/176 ,  H04N19/139 ,  H04N19/70

Abstract: A method and apparatus for video coding. According to the method, a set of candidates associated with coding modes or mode parameters are determined. Boundary matching costs associated with the set of candidates are determined, where each of the boundary matching costs is determined for one target candidate of the set of candidates. The costs are calculated by using reconstructed or predicted samples of the current block and one or more neighboring blocks of the current block. Each of the boundary matching costs is calculated using one target configuration selected from a plurality of configurations. A final candidate is selected from the set of candidates based on the boundary matching costs. The current block is encoded or decoded using the final candidate.