公开(公告)号：US20250113028A1

公开(公告)日：2025-04-03

申请号：US18730932

申请日：2023-01-13

Applicant: MEDIATEK INC.

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

IPC: H04N19/119 ,  H04N19/105 ,  H04N19/139 ,  H04N19/176 ,  H04N19/70

Abstract: A method and apparatus for video coding are disclosed for the encoder side and the decoder side. According to the method for the decoder side, encoded data associated with a current block is received. A pseudo GPM in a target GPM group for the current block is determined. The current block is divided into one or more subblocks. Assigned MVs (Motion Vectors) of each subblock are determined according to the pseudo GPM. A cost for each GPM in the target GPM group is determined according to decoded data. A selected GPM is determined based on a mode syntax and a reordered target GPM group corresponding to the target GPM group reordered according to the costs, wherein the pseudo GPM is allowed to be different from the selected GPM. The encoded data is decoded using information comprising the selected GPM.

公开(公告)号：US20250080756A1

公开(公告)日：2025-03-06

申请号：US18720901

申请日：2022-12-20

Applicant: MEDIATEK INC.

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

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

Abstract: A method and apparatus for inter prediction in video coding system are disclosed. According to the method, one or more model parameters of one or more cross-color models for the second-color block are determined. Then, cross-color predictors for the second-color block are determined, wherein one cross-color predictor value for the second-color block is generated for each second-color pixel of the second-color block by applying said one or more cross-color models to corresponding reconstructed or predicted first-color pixels. The input data associated with the second-color block is encoded using prediction data comprising the cross-color predictors for the second-color block at the encoder side, or the input data associated with the second-color block is decoded using the prediction data comprising the cross-color predictors for the second-color block at the decoder side.

公开(公告)号：US20250071288A1

公开(公告)日：2025-02-27

申请号：US18728992

申请日：2023-01-18

Applicant: MEDIATEK INC.

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

IPC: H04N19/136 ,  H04N19/105 ,  H04N19/176 ,  H04N19/186

Abstract: A method and apparatus for video coding are disclosed. According to the method for the decoder side, encoded data associated with a current block comprising a first-colour block and a second-colour block are received. An inherited model parameter set is determined from a previously coded block coded in a first CCLM related mode, wherein the inherited model parameter set comprises a first scaling parameter associated with the first CCLM related mode. A final inherited model parameter set is derived if an update value for the inherited model parameter set is determined, where the final inherited model parameter set is determined based on the first scaling parameter and the update value. Then, the encoded data associated with the second-colour block are decoded using prediction data based on an updated CCLM related model associated with the final inherited model parameter set. A method and apparatus for the encoder side are also disclosed.

公开(公告)号：US20250063155A1

公开(公告)日：2025-02-20

申请号：US18720919

申请日：2022-12-20

Applicant: MEDIATEK INC.

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

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

Abstract: A method and apparatus for inter prediction in video coding system are disclosed. According to the method, input data associated with a current block comprising at least one colour block are received. A blending predictor is determined according to a weighted sum of at least two candidate predictions generated based on one or more first hypotheses of prediction, one or more second hypotheses of prediction, or both. The first hypotheses of prediction are generated based on one or more intra prediction modes comprising a DC mode, a planar mode or at least one angular modes. The second hypotheses of prediction are generated based on one or more cross-component modes and a collocated block of said at least one colour block. The input data associated with the colour block is encoded or decoded using the blending predictor.

公开(公告)号：US20230328256A1

公开(公告)日：2023-10-12

申请号：US17714527

申请日：2022-04-06

Applicant: MEDIATEK INC.

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

IPC: H04N19/147 ,  H04N19/105 ,  H04N19/18 ,  H04N19/176 ,  H04N19/70 ,  H04N19/46

CPC classification number: H04N19/147 ,  H04N19/105 ,  H04N19/46 ,  H04N19/176 ,  H04N19/70 ,  H04N19/18

Abstract: Methods and apparatus for video coding system utilizing Rate-Distortion Optimized Quantization (RDOQ) are provided. According to one method, a rate for a level belonging to a level set of a current quantized transform coefficient is estimated for a current coefficient group (CG) based on neighboring quantized coefficients of the current quantized transform coefficient and the current CG. A best level for the current quantized transform coefficient is selected from the level set for a best RD-cost. In another method, a TB is partitioned into M regions and M best regions are derived for the M regions according to RDOQ. At least two alternative region RD-costs are generated for each of the M best regions based on a relative position between each of the M best regions and a last significant region in the TB. TB RD-cost for the TB is selected according a last non-zero best region position.

公开(公告)号：US20230209042A1

公开(公告)日：2023-06-29

申请号：US18060641

申请日：2022-12-01

Applicant: MEDIATEK INC.

Inventor： Man-Shu CHIANG ,  Chih-Wei HSU

IPC: H04N19/105 ,  H04N19/132 ,  H04N19/88 ,  H04N19/176

CPC classification number: H04N19/105 ,  H04N19/132 ,  H04N19/88 ,  H04N19/176

Abstract: A method and apparatus for video coding. According to this method, a set of candidates associated with coding modes or coding parameters is 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, by using reconstructed or predicted samples of the current block and neighbouring reconstructed or predicted samples of the current block. The reconstructed or predicted samples of the current block are determined according to said one target candidate. The set of candidates are reordered according to the boundary matching costs. The current block is then encoded or decoded using a final candidate selected from the set of candidates based on reordered candidates of the set of candidates.

公开(公告)号：US20230171403A1

公开(公告)日：2023-06-01

申请号：US17702372

申请日：2022-03-23

Applicant: MEDIATEK INC.

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

IPC: H04N19/117 ,  H04N19/82 ,  H04N19/176 ,  H04N19/174

CPC classification number: H04N19/117 ,  H04N19/82 ,  H04N19/174 ,  H04N19/176

Abstract: Video encoding methods and apparatuses include collecting statistics data, determining a matrix and vector representing a set of linear equations, solving the matrix and vector by a novel Gaussian elimination method to derive optimal parameter adjustments for an affine mode or adaptive loop filter coefficients, and encoding the current block by the affine mode or encoding one or more blocks by applying ALF filtering. Embodiments of the novel Gaussian elimination method reduce the critical path of entry operations in each row elimination step from one reciprocal, two multiplication, and one addition operations to one reciprocal, one multiplication, and one addition operations, or one multiplication and one addition operations.

公开(公告)号：US20230119972A1

公开(公告)日：2023-04-20

申请号：US17577500

申请日：2022-01-18

Applicant: MEDIATEK INC.

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

IPC: H04N19/147 ,  H04N19/119 ,  H04N19/132 ,  H04N19/105 ,  H04N19/159 ,  H04N19/176

Abstract: Video encoding methods and apparatuses for performing rate-distortion optimization by a hierarchical architecture include receiving input data associated with a current block in a current picture, determining a block partitioning structure to split the current block into coding blocks and determining a corresponding coding mode for each coding block by multiple Processing Element (PE) groups, and entropy encoding the coding blocks in the current block according to the coding modes determined by the PE groups. Each PE group has parallel PEs and is associated with a particular block size. The parallel PEs in each PE group test a number of coding modes on each partition or sub-partition of the current block to derive rate-distortion costs. The block partitioning structure and corresponding coding modes are then decided based on the rate-distortion costs derived by the PE groups.

公开(公告)号：US20220224898A1

公开(公告)日：2022-07-14

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

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：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.