公开(公告)号：US20210176501A1

公开(公告)日：2021-06-10

申请号：US17110491

申请日：2020-12-03

Applicant: MEDIATEK INC.

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

IPC: H04N19/82 ,  H04N19/176 ,  H04N19/186 ,  H04N19/70 ,  H04N19/46 ,  H04N19/172 ,  H04N19/117 ,  H04N19/174

Abstract: Encoding methods and apparatuses include applying a Cross-Component Adaptive Loop Filter (CCALF) processing on a current picture based on CCALF coefficients signaled in one or more Adaptive Loop Filter (ALF) Adaptation Parameter Sets (APSs) to refine one or more chroma components according to a luma component, signaling two ALF signal flags and two CCALF signal flags in each ALF APS or parsing two ALF signal flags and two CCALF signal flags from each ALF APS, and encoding or decoding the current picture. Values of the two ALF signal flags and the two CCALF signal flags in each ALF APS are not all equal to 0 to ensure none of the ALF APS is an empty APS.

公开(公告)号：US20250071260A1

公开(公告)日：2025-02-27

申请号：US18727004

申请日：2023-01-10

Applicant: MEDIATEK INC.

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

IPC: H04N19/105 ,  H04N19/176 ,  H04N19/182

Abstract: A method and apparatus for video coding are disclosed. According to the method, a set of MC (Motion Compensation) candidates with each MC candidate comprising predicted samples for coding boundary pixels of the current block are determined. The set of MC candidates comprises a first candidate, and wherein the first candidate corresponds to a weighted sum of first predicted pixels generated according to first motion information of the current block and second predicted pixels generated according to second motion information of a neighbouring boundary block of the current block. Boundary matching costs associated with the set of MC candidates are determined respectively. A final candidate is determined from the set of MC candidates based on the boundary matching costs. The current block is encoded or decoded using the final candidate.

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：US20240357153A1

公开(公告)日：2024-10-24

申请号：US18684787

申请日：2022-08-18

Applicant: MEDIATEK INC.

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

IPC: H04N19/513 ,  G06V10/75 ,  H04N19/139 ,  H04N19/176

CPC classification number: H04N19/513 ,  G06V10/751 ,  H04N19/139 ,  H04N19/176

Abstract: Method and apparatus for template matching with a determined area are disclosed. According to this method, a current template comprising current neighbouring pixels on an above side of the current block, on a left side of the current block, or a combination thereof for a current block is received. An area in a reference picture is then determined, where the reference picture corresponds to a previously coded picture. A matching result between a restricted reference template of a reference block and the current template is then determined, wherein the restricted reference template is generating by using only neighbouring reference pixels of a reference template inside the determined area, the reference template has a same shape as the current template, and a location of the reference template is determined according to a target motion vector (MV) from the current template.

公开(公告)号：US20210321106A1

公开(公告)日：2021-10-14

申请号：US17350966

申请日：2021-06-17

Applicant: MEDIATEK INC.

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

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

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：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.