公开(公告)号：US20250119572A1

公开(公告)日：2025-04-10

申请号：US18730921

申请日：2023-01-16

Applicant: MEDIATEK INC.

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

IPC: H04N19/513 ,  H04N19/105 ,  H04N19/139 ,  H04N19/176

Abstract: A method for constraining multi-pass decoder-side motion vector refinement (MP-DMVR) is provided. A video coder receives data for a block of pixels to be encoded or decoded as a current block of a current picture of a video. A video coder receives a motion vector that references a block of pixels in a reference picture based on the received data. A video coder refines the motion vector in a plurality of refinement passes by examining pixels in the reference picture that are identified based on the refined motion vector. The refinement of the motion vector is constrained by a refinement range. The video coder encodes or decodes the current block by using the refined motion vector to produce prediction residuals or to reconstruct the current block.

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：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：US20230345029A1

公开(公告)日：2023-10-26

申请号：US17728392

申请日：2022-04-25

Applicant: MEDIATEK INC.

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

IPC: H04N19/463 ,  H04N19/172 ,  H04N19/52 ,  H04N19/139 ,  H04N19/82 ,  H04N19/117 ,  H04N19/136 ,  H04N19/184

CPC classification number: H04N19/463 ,  H04N19/172 ,  H04N19/52 ,  H04N19/139 ,  H04N19/82 ,  H04N19/117 ,  H04N19/136 ,  H04N19/184

Abstract: Method and apparatus for affine CPMV or ALF refinement are mentioned. According to this method, statistical data associated with the affine CPMV or ALF refinement are collected over a picture area. Updated parameters for the affine CPMV refinement or the ALF refinement are then derived based on the statistical data, where a process to derive the updated parameters includes performing multiplication using a reduced-precision multiplier for the statistical data. The reduced-precision multiplier truncates at least one bit of the mantissa part. In another embodiment, the process to derive the updated parameters includes performing reciprocal for the statistical data using a lookup table with (m−k)-bit input by truncating k bits from the m-bit mantissa part, and contents of the lookup table includes m-bit outputs. m and k are positive integers.

公开(公告)号：US20230328278A1

公开(公告)日：2023-10-12

申请号：US18181858

申请日：2023-03-10

Applicant: MEDIATEK INC.

Inventor： Yu-Cheng LIN ,  Chun-Chia CHEN ,  Tzu-Der CHUANG ,  Chih-Wei HSU ,  Ching-Yeh CHEN

IPC: H04N19/583 ,  H04N19/105 ,  H04N19/176

CPC classification number: H04N19/583 ,  H04N19/176 ,  H04N19/105

Abstract: A method and apparatus for Overlapped Boundary Motion Compensation (OBMC) are provided. According to the method, input data associated with a current block is received, wherein the input data includes pixel data for the current block to be encoded at an encoder side or coded data associated with the current block to be decoded at a decoder side. An inter prediction tool from a set of inter-prediction coding tools is determined for the current block. An OBMC subblock size for the current block is determined based on information related to the inter prediction tool selected for the current block or the inter prediction tool of a neighboring block. Subblock OBMC is applied to a subblock boundary between a neighboring subblock and a current subblock of the current block according to the OBMC subblock size.

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.

公开(公告)号：US20220303529A1

公开(公告)日：2022-09-22

申请号：US17619812

申请日：2020-06-24

Applicant: MEDIATEK INC.

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

IPC: H04N19/117 ,  H04N19/82 ,  H04N19/132 ,  H04N19/186 ,  H04N19/172

Abstract: Methods and apparatus for video coding are disclosed. According to one method, First ALF (Adaptive Loop Filter) processing is applied to the reconstructed chroma samples for a target reconstructed chroma sample to generate a first filtered chroma sample. Second ALF processing is applied to the related reconstructed luma samples to generate a second filtered chroma sample for the target reconstructed chroma sample, where positions of the related reconstructed luma samples selected for the second ALF processing are determined according to the target chroma format. According to another method, the luma ALF and the cross-component ALF have the same filter coefficient precision.

公开(公告)号：US20220210470A1

公开(公告)日：2022-06-30

申请号：US17619788

申请日：2020-06-24

Applicant: MEDIATEK INC.

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

IPC: H04N19/593 ,  H04N19/176 ,  H04N19/172 ,  H04N19/11 ,  H04N19/105 ,  H04N19/132 ,  H04N19/186 ,  H04N19/61 ,  H04N19/18 ,  H04N19/70

Abstract: An image or video processing method comprises receiving input data of a current block, mapping an MIP mode index to a default mode, and encoding or decoding the current block by referencing the default mode. Another image or video processing method comprises receiving input data of a current block coded or to be coded by an MIP mode, and parsing or signaling a transpose flag for the current block indicating whether transposing is applied in coding the current block. Reference samples of the current block are prepared from neighboring boundary samples according to the transpose flag. A matrix is selected to be multiplied to the reference samples to generate predicted samples. A transposing process is adaptively applied to the current block according to the transpose flag, and the predicted samples are used to encode or decode the current block.