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：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.

公开(公告)号：US20220124318A1

公开(公告)日：2022-04-21

申请号：US17567302

申请日：2022-01-03

Applicant: MEDIATEK INC.

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

IPC: H04N19/105 ,  H04N19/159 ,  H04N19/176 ,  H04N19/186 ,  H04N19/96

Abstract: Video processing methods comprise receiving input data of a current block in a current picture, constructing a candidate list for the current block by including one or more History-based Motion Vector Predictor (HMVP) candidates, selecting one candidate from the candidate list, locating a reference block according to motion information of the selected candidate, and encoding or decoding the current block by predicting the current block using the reference block. The one or more HMVP candidates are fetched from a normal HMVP table if the current block is to be processed by a normal inter prediction mode, and the one or more HMVP candidates are fetched form a Current Picture Referencing (CPR) HMVP table if the current block is to be processed by a CPR mode. The two HMVP tables are separately maintained and updated.

公开(公告)号：US20220086439A1

公开(公告)日：2022-03-17

申请号：US17418311

申请日：2019-12-30

Applicant: MEDIATEK INC.

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

IPC: H04N19/119 ,  H04N19/96 ,  H04N19/186 ,  H04N19/176

Abstract: A method and apparatus for block partition are disclosed. If a cross-colour component prediction mode is allowed, the luma block and the chroma block are partitioned into one or more luma leaf blocks and chroma leaf blocks. If a cross-colour component prediction mode is allowed, whether to enable an LM (Linear Model) mode for a target chroma leaf block is determined based on a first split type applied to an ancestor chroma node of the target chroma leaf block and a second split type applied to a corresponding ancestor luma node. According to another method, after the luma block and the chroma block are partitioned using different partition tress, determine whether one or more exception conditions to allow an LM for a target chroma leaf block are satisfied when the chroma partition tree uses a different split type, a different partition direction, or both from the luma partition tree.

公开(公告)号：US20210385467A1

公开(公告)日：2021-12-09

申请号：US17265967

申请日：2019-08-16

Applicant: MEDIATEK INC.

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

IPC: H04N19/196 ,  H04N19/96 ,  H04N19/124 ,  H04N19/70 ,  H04N19/176 ,  H04N19/167

Abstract: Video data processing methods and apparatuses comprise receiving input data associated with a current chroma block, determine a luma Quantization Parameter (QP) of a collocated luma block, reuse the luma QP of the collocated luma block to derive a chroma QP for the current chroma block, and encode or decode one or more Transform Units (TUs) associated with the current chroma block using the chroma QP. The collocated luma block is a block that covers a collocated sample of one predefined sample of the current chroma block, and an example of the predefined sample is a center sample of the current chroma block. The input video data is partitioned according to two separate Coding Unit (CU) partitioning structures for luma and chroma components when dual tree coding is enabled.

公开(公告)号：US20210368175A1

公开(公告)日：2021-11-25

申请号：US17395549

申请日：2021-08-06

Applicant: MEDIATEK INC.

Inventor： Tzu-Der CHUANG ,  Ching-Yeh CHEN ,  Kung-Nien YANG ,  Chun-Chia CHEN

IPC: H04N19/119 ,  H04N19/176 ,  H04N19/186 ,  H04N19/70 ,  H04N19/96

Abstract: A method and apparatus of video coding operate by receiving input data associated with a current data unit in a current picture, wherein the current data unit includes a luma component and a chroma component and the current data unit includes a luma data unit and a chroma data unit. The operation proceeds by splitting the luma data unit and the Chroma data unit using one shared tree until the luma data unit and the chroma data unit reach a stop node, encoding or decoding the stop node as a leaf CU (coding unit) if the stop node is greater than M×N for the luma component, M and N are positive integers, and signalling or parsing a prediction mode for the stop node if the stop node is smaller than or equal to M×N for the luma component.

公开(公告)号：US20210329233A1

公开(公告)日：2021-10-21

申请号：US17260008

申请日：2019-07-12

Applicant: MEDIATEK INC.

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

IPC: H04N19/119 ,  H04N19/176 ,  H04N19/436 ,  H04N19/70 ,  H04N19/96 ,  H04N19/186

Abstract: Video processing methods and apparatuses in a video encoding or decoding system for processing a video picture partitioned into blocks with one or more partition constraints. The video encoding or decoding system receives input data of a current block and checks whether a predefined splitting type is allowed to partition the current block according to first and second constraints. The first constraint restricts each sub-block partitioned from the current block to be completely contained in one pipeline unit, and the second constraint restricts each sub-block partitioned from the current block to contain one or more complete pipeline units. The pipeline units are non-overlapping units in the video picture designed for pipeline processing. The current block is not partitioned by the predefined splitting type if any sub-block partitioned by the predefined splitting type violates both the first and second constraints. The system encodes or decodes the current block.