公开(公告)号：US12063387B2

公开(公告)日：2024-08-13

申请号：US15861476

申请日：2018-01-03

Applicant: MediaTek Inc.

Inventor： Tzu-Der Chuang ,  Ching-Yeh Chen

IPC: H04N19/577 ,  H04N19/517 ,  H04N19/527 ,  H04N19/96

CPC classification number: H04N19/577 ,  H04N19/517 ,  H04N19/527 ,  H04N19/96

Abstract: The techniques described herein relate to methods, apparatus, and computer readable media configured to determine motion vectors. The techniques relate to both encoders and decoders. For example, a decoder receives compressed video data related to a set of frames. The decoder calculates, using a decoder-side predictor refinement technique, a new motion vector for a current frame from the set of frames, wherein the new motion vector estimates motion for the current frame based on one or more reference frames. The calculation includes retrieving a first motion vector associated with the current frame, executing a first portion of the decoding process using the first motion vector, retrieving a second motion vector associated with the current frame that is different than the first motion vector, and executing a second portion of the decoding process using the second motion vector.

公开(公告)号：US11985324B2

公开(公告)日：2024-05-14

申请号：US17437148

申请日：2020-03-13

Applicant: MEDIATEK INC.

Inventor： Yu-Cheng Lin ,  Chun-Chia Chen ,  Chih-Wei Hsu ,  Ching-Yeh Chen ,  Tzu-Der Chuang ,  Yu-Wen Huang

IPC: H04N19/137 ,  H04N19/105 ,  H04N19/132 ,  H04N19/159 ,  H04N19/176 ,  H04N19/513

CPC classification number: H04N19/137 ,  H04N19/105 ,  H04N19/132 ,  H04N19/159 ,  H04N19/176 ,  H04N19/513

Abstract: Exemplary video processing methods and apparatuses for encoding or decoding a current block by inter prediction are disclosed. Input data of a current block is received and partitioned into sub-partitions and motion refinement is independently performed on each sub-partition. A reference block for each sub-partition is obtained from one or more reference pictures according to an initial motion vector (MV). A refined MV for each sub-partition is derived by searching around the initial MV with N-pixel refinement. One or more boundary pixels of the reference block for a sub-partition is padded for motion compensation of the sub-partition. A final predictor for the current block is generated by performing motion compensation for each sub-partition according to its refined MV. The current block is then encoded or decoded according to the final predictor.

公开(公告)号：US11930169B2

公开(公告)日：2024-03-12

申请号：US17619812

申请日：2020-06-24

Applicant: MEDIATEK INC.

Inventor： Chen-Yen Lai ,  Ching-Yeh Chen ,  Tzu-Der Chuang

IPC: H04N7/12 ,  H04N19/117 ,  H04N19/132 ,  H04N19/172 ,  H04N19/186 ,  H04N19/82

CPC classification number: H04N19/117 ,  H04N19/132 ,  H04N19/172 ,  H04N19/186 ,  H04N19/82

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：US11792401B2

公开(公告)日：2023-10-17

申请号：US17249667

申请日：2021-03-09

Applicant: MEDIATEK INC.

Inventor： Zhi-Yi Lin ,  Tzu-Der Chuang ,  Ching-Yeh Chen ,  Chih-Wei Hsu

IPC: H04N19/132 ,  H04N19/105 ,  G06F17/16 ,  H04N19/176 ,  H04N19/159

CPC classification number: H04N19/132 ,  G06F17/16 ,  H04N19/105 ,  H04N19/159 ,  H04N19/176

Abstract: Method and apparatus of video coding are disclosed. According to one method, the left reference boundary samples and the top reference boundary samples are checked jointly. According to another method, selected original left reference boundary samples and selected original top reference boundary samples at specific positions are used for predictor up-sampling. According to yet another method, the horizontal interpolation and the vertical interpolation are in a fixed order regardless of a shape of the current block, size of the current block or both.

公开(公告)号：US11695953B2

公开(公告)日：2023-07-04

申请号：US17326421

申请日：2021-05-21

Applicant: MEDIATEK INC.

Inventor： Zhi-Yi Lin ,  Tzu-Der Chuang ,  Ching-Yeh Chen ,  Chun-Chia Chen ,  Chih-Wei Hsu

IPC: H04N19/577 ,  H04N19/70

CPC classification number: H04N19/577 ,  H04N19/70

Abstract: A method and apparatus use an Inter coding tool and OBMC (Overlapped Block Motion Compensation). According to one implementation, a method of video coding using OBMC (Overlapped Block Motion Compensation) operates by receiving input data associated with a current block, wherein the input data correspond to pixel data to be coded at an encoder side or coded data to be decoded at a decoder side, applying the OBMC to the current block depending on one or more constraints, and signaling an OBMC syntax conditionally at the encoder side or parsing the OBMC syntax conditionally at the decoder side for the current block, wherein the OBMC syntax indicates whether the OBMC is applied to the current block.

公开(公告)号：US20230199199A1

公开(公告)日：2023-06-22

申请号：US17978530

申请日：2022-11-01

Applicant: MediaTek Inc.

Inventor： Cheng-Yen Chuang ,  Chun-Chia Chen ,  Chih-Wei Hsu ,  Tzu-Der Chuang ,  Ching-Yeh Chen ,  Yu-Wen Huang

IPC: H04N19/176 ,  H04N19/119

CPC classification number: H04N19/176 ,  H04N19/119

Abstract: Various schemes pertaining to video coding parallelization techniques are described. An apparatus receives video data. The apparatus subsequently calculates a plurality of figures of merits (FOMs), each of the FOM representing how well a particular coding tool may perform in encoding the video data. The apparatus further determines a coding tool that may be suitable for encoding the video data by comparing the FOMs. In determining the coding tool, the apparatus utilizes time-interleaving techniques to parallelly process the video data. The video data may include an array of coding blocks, and the apparatus may receive the video data using a snake-like processing order scanning through the array of coding blocks.

公开(公告)号：US20230199170A1

公开(公告)日：2023-06-22

申请号：US17977466

申请日：2022-10-31

Applicant: MediaTek Inc.

Inventor： Cheng-Yen Chuang ,  Man-Shu Chiang ,  Chun-Chia Chen ,  Chih-Wei Hsu ,  Tzu-Der Chuang ,  Ching-Yeh Chen ,  Yu-Wen Huang

IPC: H04N19/105 ,  H04N19/176 ,  H04N19/117 ,  H04N19/423 ,  H04N19/52

CPC classification number: H04N19/105 ,  H04N19/52 ,  H04N19/117 ,  H04N19/176 ,  H04N19/423

Abstract: A video coding system generating candidates for Merge Mode with Motion Vector Difference (MMVD) with reduced resource usage is provided. The system receives data to be encoded or decoded as a current block of a current picture of a video. The system identifies multiple MMVD candidates for different offset positions based on a merge candidate of the current block. The system generates reference samples for the identified MMVD candidates. The system reconstructs the current block or encodes the current block into a bitstream by using the generated reference samples. The system processes the MMVD candidates in separate groups: a first group of vertical MMVD candidates and a second group of horizontal MMVD candidates. The system generates the reference samples for the identified MMVD candidates by applying a vertical filter to source reference samples of horizontal MMVD candidates and then applying a horizontal filter to outputs of the vertical filter.

公开(公告)号：US11539940B2

公开(公告)日：2022-12-27

申请号：US17292184

申请日：2019-11-12

Applicant: MEDIATEK INC.

Inventor： Man-Shu Chiang ,  Chih-Wei Hsu ,  Tzu-Der Chuang ,  Ching-Yeh Chen

IPC: H04N19/105 ,  H04N19/119 ,  H04N19/172 ,  H04N19/176 ,  H04N19/51

Abstract: A method and apparatus of prediction for video coding using MH (Multiple Hypothesis) mode are disclosed. According to this method, a block is partitioned into a first partition and a second partition. A first candidate and a second candidate are derived for the first and second partitions respectively. At least one of the first candidate and the second candidate is derived using a candidate list derived for a regular Merge mode (or also called as normal Merge mode). An MH prediction generated by blending a first prediction corresponding to a first candidate and a second prediction corresponding to a second candidate, and the MH prediction is applied to a part of the current block.

公开(公告)号：US11516513B2

公开(公告)日：2022-11-29

申请号：US16977158

申请日：2019-03-13

Applicant: MEDIATEK INC.

Inventor： Chun-Chia Chen ,  Chia-Ming Tsai ,  Yu-Chi Su ,  Chen-Yen Lai ,  Chih-Wei Hsu ,  Ching-Yeh Chen ,  Tzu-Der Chuang ,  Yu-Wen Huang ,  Han Huang

IPC: H04N19/70 ,  H04N19/174 ,  H04N19/64 ,  H04N19/66 ,  H04N19/89

Abstract: In one method, the current block is partitioned into multiple final sub-blocks using one or more stages of sub-tree partition comprising ternary tree partition and at least one other-type partition, where ternary partition tree is excluded from the sub-tree partition if a current sub-tree depth associated with a current sub-block is greater than a first threshold and the first threshold is an integer greater than or equal to 1. In another method, if a test condition is satisfied, the current block is encoded or decoded using a current Inter mode selected from a modified group of Inter tools, where the modified group of Inter tools is derived from an initial group of Inter tools by removing one or more first Inter tools from the initial group of Inter tools, replacing one or more second Inter tools with one or more complexity-reduced Inter tools, or both.

公开(公告)号：US11509934B2

公开(公告)日：2022-11-22

申请号：US16494586

申请日：2018-03-13

Applicant: MEDIATEK INC.

Inventor： Ching-Yeh Chen ,  Tzu-Der Chuang ,  Yu-Wen Huang

IPC: H04N19/122 ,  H04N19/60 ,  H04N19/176 ,  H04N19/18 ,  H04N19/96

Abstract: A method and apparatus for video coding incorporating enhanced multiple transform (EMT) are disclosed. According to one method, the number of candidates for EMT in the horizontal direction or vertical direction is reduced depending on the current block size. According to another method, an EMT flag, one or more EMT indices or both are signalled only if the total number of non-zero coefficients in at least a part of the 2D coefficient block is greater than a threshold, where the threshold is equal to 1 or larger. A method and apparatus for video coding using non-separable secondary transform (NSST) are disclosed. According to this method, a total number of non-zero first coefficients in a partial block of the 2D coefficient block is determined and used to determine whether to apply the NSST process.