公开(公告)号：US11350131B2

公开(公告)日：2022-05-31

申请号：US16908436

申请日：2020-06-22

Applicant: MediaTek Inc.

Inventor： Shih-Ta Hsiang ,  Lulin Chen ,  Tzu-Der Chuang ,  Chih-Wei Hsu ,  Ching-Yeh Chen ,  Olena Chubach ,  Yu-Wen Huang

IPC: H04N19/70 ,  H04N19/105 ,  H04N19/124 ,  H04N19/176

Abstract: A method for performing transform skip mode (TSM) in a video decoder is provided. A video decoder receives data from a bitstream to be decoded as a plurality of video pictures. The video decoder parses the bitstream for a first syntax element in a sequence parameter set (SPS) of a current sequence of video pictures. When the first syntax element indicates that transform skip mode is allowed for the current sequence of video pictures and when transform skip mode is used for a current block in a current picture of the current sequence, the video decoder reconstructs the current block by using quantized residual signals that are not transformed.

公开(公告)号：US11159788B2

公开(公告)日：2021-10-26

申请号：US17257929

申请日：2019-08-02

Applicant: MEDIATEK INC.

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

IPC: H04N19/00 ,  H04N19/105 ,  H04N19/159 ,  H04N19/176 ,  H04N19/70 ,  H04N19/137

Abstract: A method and apparatus Inter prediction for video coding including IBC (Intra Block Copy) coding tool are disclosed. According to one method, a current permitted band inside the current picture for the current block is identified. A target IBC candidate is selected, where a target block vector of the target IBC candidate points from the current block to a target reference block in the current picture. An adjusted candidate list is generated by taking into account of the target IBC candidate and the current permitted band. The current motion information associated with the current block is encoded using the adjusted candidate list at the video encoder side or decoded using the adjusted candidate list at the video decoder side using the adjusted candidate list. In another method, a syntax for a target MVD (Motion Vector Difference) is decoded without sign information or with reduced sign information of the target MVD.

公开(公告)号：US11153607B2

公开(公告)日：2021-10-19

申请号：US16216650

申请日：2018-12-11

Applicant: MEDIATEK INC.

Inventor： Chia-Ming Tsai ,  Tzu-Der Chuang ,  Chih-Wei Hsu ,  Ching-Yeh Chen ,  Yu-Wen Huang

IPC: H04B1/66 ,  H04N7/12 ,  H04N11/02 ,  H04N11/04 ,  H04N19/86 ,  H04N19/117 ,  H04N19/132 ,  H04N19/137 ,  H04N19/176 ,  H04N19/80

Abstract: A deblocking filtering method includes receiving reconstructed video data associated with a block boundary in a video coding system. The block boundary has N lines of samples crossing the block boundary from a P side to a Q side of the boundary. The method further includes determining whether to apply a first filter set to reduce block artifacts at the block boundary based on whether a first inter-side difference of a first line of the N lines of samples is greater than an inter-side difference threshold, determining a filter length of a filter in the first filter set based on a first side length of the P side, and a second side length of the Q side when it is determined to apply the first filter set, and applying at least one filter in the first filter set with the determined filter length on the block boundary.

公开(公告)号：US11122285B2

公开(公告)日：2021-09-14

申请号：US16743631

申请日：2020-01-15

Applicant: MEDIATEK INC.

Inventor： Chun-Chia Chen ,  Chih-Wei Hsu ,  Ching-Yeh Chen ,  Yu-Wen Huang

IPC: H04N19/51 ,  G06F16/783 ,  H04N19/70 ,  H04N19/573 ,  H04N19/119 ,  H04N19/513 ,  H04N19/52 ,  H04N19/176

Abstract: Aspects of the disclosure provide a video coding method for processing a current prediction unit (PU) with a sub-PU temporal motion vector prediction (TMVP) mode. The method can include receiving the current PU including sub-PUs, determining an initial motion vector that is a motion vector of a spatial neighboring block of the current PU, performing a searching process to search for a main collocated picture in a sequence of reference pictures of the current PU based on the initial motion vector, and obtaining collocated motion information in the main collocated picture for the sub-PUs of the current PU. The searching process can include turning on motion vector scaling operation for searching a subset of the sequence of reference pictures, and turning off the motion vector scaling operation for searching the other reference pictures in the sequence of reference pictures.

公开(公告)号：US11109062B2

公开(公告)日：2021-08-31

申请号：US16494565

申请日：2018-03-02

Applicant: MEDIATEK INC.

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

IPC: H04N19/577 ,  H04N19/523

Abstract: Method and apparatus of using Bi-directional optical flow (BIO) for a true bi-direction predicted block are disclosed. According to one method of the present invention, a division-free BIO process is disclosed, where the x-motion offset and y-motion offset are derived using operations including right-shifting without any division operation. According to another method, a refined predictor is generated for the current block by applying BIO process to the reference blocks, where said applying the BIO process comprises applying a boundary-condition-dependent BIO process conditionally to boundary pixels associated with the reference blocks.

公开(公告)号：US20210258613A1

公开(公告)日：2021-08-19

申请号：US17178134

申请日：2021-02-17

Applicant: MediaTek Inc.

Inventor： Chih-Wei Hsu ,  Lulin Chen ,  Chun-Chia Chen ,  Yu-Ling Hsiao ,  Yu-Wen Huang ,  Ching-Yeh Chen ,  Tzu-Der Chuang

IPC: H04N19/70 ,  H04N19/119 ,  H04N19/184 ,  H04N19/174

Abstract: A video system that partitions slices of video pictures into slice chunks is provided. A video decoder receives data from a bitstream to be decoded as a current picture of a video. When a first syntax element in a picture parameter set (PPS) of the current picture indicates that one or more slices of the current picture are allowed to be divided into multiple slice chunks and when a second syntax element in a slice header of a current slice of the current picture indicates that data of the current slice is encoded and delivered in two or more slice chunks, the video decoder parses and specifies sizes and positions of the slice chunks of the current slice and reconstructs the current picture based on the slice chunks of the current slice.

公开(公告)号：US11089323B2

公开(公告)日：2021-08-10

申请号：US16301772

申请日：2017-05-26

Applicant: MEDIATEK INC.

Inventor： Tzu-Der Chuang ,  Ching-Yeh Chen ,  Yu-Chen Sun ,  Yu-Wen Huang ,  Shan Liu ,  Xiaozhong Xu

IPC: H04N19/52 ,  H04N19/105 ,  H04N19/176 ,  H04N19/119 ,  H04N19/186 ,  H04N19/513 ,  H04N19/70 ,  H04N19/00 ,  H04N19/159 ,  H04N19/96 ,  H04N19/436

Abstract: A method and apparatus for a video coding system with the current picture referencing (CPR) mode enabled are disclosed. According to one method, the luma and chroma blocks of the current image are jointly coded using a same coding unit (CU) structure if the CPR mode is selected for the luma and the chroma blocks. Alternatively, if the luma and chroma components are partitioned into the luma and the chroma blocks separately using separate CU structures, the luma and chroma blocks are encoded or decoded using a coding mode selected from a coding mode group excluding the CPR mode. According to another method, the luma and chroma blocks of the current image are coded separately using a different CU structure if the CPR mode is selected for the luma and chroma blocks. In yet another method, reconstructed reference data is disclosed for the CPR mode with CU equal to PU.

公开(公告)号：US11064220B2

公开(公告)日：2021-07-13

申请号：US16707191

申请日：2019-12-09

Applicant: MEDIATEK INC.

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

IPC: H04N19/96 ,  H04N19/167 ,  H04N19/176 ,  H04N19/70 ,  H04N19/119 ,  H04N19/134

Abstract: A video data processing method includes receiving input data associated with a current block in a current picture, wherein the current picture is partitioned into multiple non-overlapped blocks, and recursively splitting the current block into multiple leaf blocks based on a location of the current block in the current picture. The recursively splitting operation includes, when the location of the current block satisfies with a first condition, recursively splitting the current block according to a quadtree split, and, when the location of the current block satisfies with a second condition, recursively splitting the current block according to a selected split determined from a group comprising a vertical binary tree split and a horizontal binary tree split. The method further includes encoding or decoding the current block by individually processing each leaf blocks in the current block for prediction and transform processing.

公开(公告)号：US10999595B2

公开(公告)日：2021-05-04

申请号：US15776154

申请日：2016-11-08

Applicant: MEDIATEK INC.

Inventor： Jian-Liang Lin ,  Tzu-Der Chuang ,  Yu-Wen Huang ,  Yi-Wen Chen

IPC: H04N19/517 ,  H04N19/105 ,  H04N19/159 ,  H04N19/176 ,  H04N19/46 ,  H04N19/70

Abstract: A method and apparatus of priority-based MVP (motion vector predictor) derivation for motion compensation in a video encoder or decoder are disclosed. According to this method, one or more final motion vector predictors (MVPs) are derived using priority-based MVP derivation process. The one or more final MVPs are derived by selecting one or more firstly available MVs from a priority-based MVP list for Inter prediction mode, Skip mode or Merge mode based on reference data of one or two target reference pictures that are reconstructed prior to the current block according to a priority order. Therefore, there is no need for transmitting information at the encoder side nor deriving information at the decoder side that is related to one or more MVP indices to identify the one or more final MVPs in the video bitstream.

公开(公告)号：US10944989B2

公开(公告)日：2021-03-09

申请号：US15561110

申请日：2016-03-31

Applicant: MEDIATEK INC.

Inventor： Yi-Wen Chen ,  Jicheng An ,  Jian-Liang Lin ,  Yu-Wen Huang

IPC: H04N19/593 ,  H04N19/96 ,  H04N19/186 ,  H04N19/105 ,  H04N19/157 ,  H04N19/176 ,  H04N19/122

Abstract: A method and apparatus for Intra prediction of non-square chroma blocks are disclosed. The system uses a block partitioning structure for partitioning a chroma block into one or more final sub-blocks including at least one non-square final sub-block using block partition recursively. The block partition either splits each given block into intermediate sub-blocks using one or more split modes including one binary split mode or applies no splitting to each given block. The block is treated as an initial given block and each intermediate sub-block is treated as one given block in a next recursion. Any given block that is not further split becomes a final sub-block. After the final sub-blocks are determined, non-square Intra prediction is applied to each non-square final sub-block.