公开(公告)号：US20170353719A1

公开(公告)日：2017-12-07

申请号：US15611850

申请日：2017-06-02

Applicant: MEDIATEK INC.

Inventor： Shan LIU ,  Jing YE ,  Xiaozhong XU ,  Tzu-Der CHUANG ,  Ching-Yeh CHEN

IPC: H04N19/11 ,  H04N19/593 ,  H04N19/176 ,  H04N19/82 ,  H04N19/156

CPC classification number: H04N19/11 ,  H04N19/147 ,  H04N19/156 ,  H04N19/176 ,  H04N19/463 ,  H04N19/593 ,  H04N19/82

Abstract: A method and apparatus for video coding using template-based Intra prediction are disclosed. According to one method, the template-based Intra prediction searches N template matching candidates to reduce the complexity. In another method, the template-based Intra prediction assigns different weights for different pixel locations of template or uses different pixel precision for interpolation filter during cost evaluation among template matching candidates. In yet another method, truncated template size is used to reduce the complexity. In yet another method, the left and top templates may have different sizes for non-square block. In yet another method, inverse templated-based Intra prediction is used.

公开(公告)号：US20170195677A1

公开(公告)日：2017-07-06

申请号：US15308722

申请日：2015-05-22

Applicant: MediaTek Inc.

Inventor： Jing YE ,  Shan LIU ,  Xiaozhong XU

IPC: H04N19/159 ,  H04N19/11 ,  H04N19/70 ,  H04N19/463 ,  H04N19/593 ,  H04N19/96 ,  H04N19/34 ,  H04N19/176

CPC classification number: H04N19/159 ,  H04N19/11 ,  H04N19/176 ,  H04N19/34 ,  H04N19/463 ,  H04N19/593 ,  H04N19/70 ,  H04N19/96

Abstract: A method and apparatus for video coding including an IntraBC (Intra-block copy) mode with flipping for prediction unit (PU) with a non-2N×2N partition size is disclosed. An IntraBC mode is selected from a mode group comprising a normal IntraBC mode and a flipping mode for a current PU with a current PU size belonging to a size group including at least one PU size selected from 2N×N, N×2N and N×N and N is a positive integer. When the IntraBC mode is used for the current PU, a flipping flag is signaled in a current PU-level syntax to indicate whether the current PU is coded using the flipping mode. Furthermore, when the current PU is coded using the flipping mode, a flip-direction flag is signaled in the current PU-level syntax to indicate a flipping direction of a corresponding flipped reference block.

公开(公告)号：US20200288145A1

公开(公告)日：2020-09-10

申请号：US16304207

申请日：2017-05-26

Applicant: MEDIATEK INC.

Inventor： Tzu-Der CHUANG ,  Yu-Chen SUN ,  Shan LIU ,  Ching-Yeh CHEN ,  Yu-Wen HUANG ,  Xiaozhong XU ,  Wang-Lin LAI ,  Jing YE

IPC: H04N19/157 ,  H04N19/11 ,  H04N19/119 ,  H04N19/129 ,  H04N19/176 ,  H04N19/186

Abstract: Methods and apparatus for a coding system using palette mode coding for colour video are disclosed. According to method, when the palette mode is enabled, separate coding of luma and chroma components is disabled or if separate coding of luma and chroma components, the palette mode is disabled. According to another method, when the palette mode is enabled for the current image, palette mode coding is only applied to the luma blocks and non-palette mode coding is applied to the chroma blocks. According to yet another method, palette mode coding is applied to the luma blocks using luma palettes if the palette mode is selected for the luma blocks and palette mode coding applying to the chroma blocks using chroma palettes if the palette mode is selected for the chroma blocks. According to yet another method, the scan direction for a non-square CU depends on the shape of the non-square.

公开(公告)号：US20200260111A1

公开(公告)日：2020-08-13

申请号：US15776170

申请日：2016-11-18

Applicant: MEDIATEK INC.

Inventor： Shan LIU ,  Xiaozhong XU

IPC: H04N19/527 ,  H04N19/70

Abstract: A method and apparatus of Inter prediction for video coding performed in a video encoder or a video decoder are disclosed. In one method, a GMC (global motion compensation) indication indicating whether global motion compensation is enabled is signalled at the video encoder side or parsed from the video bitstream at the video decoder side. The current processing unit is encoded or decoded using one or more coding modes including a GMC mode if the GMC indication is indicates GMC is enabled. According to another method, if a GMC mode is enabled for a region, a number representing the total number of multiple global motion models allowed is determined for encoding or decoding the processing units in the region using multiple global motion models. In yet another method the GMC and local motion compensation are applied selectively or in a combined fashion.

公开(公告)号：US20200228821A1

公开(公告)日：2020-07-16

申请号：US16827881

申请日：2020-03-24

Applicant: MEDIATEK INC.

Inventor： Tzu-Der CHUANG ,  Ching-Yeh CHEN ,  Han HUANG ,  Xiaozhong XU ,  Shan LIU

IPC: H04N19/513 ,  H04N19/423 ,  H04N19/52 ,  H04N19/537 ,  H04N19/119 ,  H04N19/176 ,  H04N19/58

Abstract: An embodiment of the method receives input data associated with a current block in a current picture at a video encoder or receiving a video bitstream corresponding to compressed data including the current block in the current picture at a video decoder, wherein the current block is coded or to be coded in an affine mode according to an affine motion model; calculates and storing affine parameters for a plurality of coded blocks in the current picture; retrieves the affine parameters of one or more coded blocks from the temporal buffer; derives an affine candidate including affine motion vectors using the retrieved affine parameters of the neighboring block; and encodes or decodes the current block by predicting the current block using one or more motion compensated blocks by the derived affine candidate.

公开(公告)号：US20200045322A1

公开(公告)日：2020-02-06

申请号：US16338514

申请日：2017-09-28

Applicant: MEDIATEK INC.

Inventor： Jing YE ,  Xiaozhong XU ,  Shan LIU

IPC: H04N19/176 ,  H04N19/186 ,  H04N19/593 ,  H04N19/11 ,  H04N19/105 ,  H04N19/159

Abstract: A method and apparatus for video coding of chroma coded in derived-mode Intra prediction are disclosed. If derived-mode (DM) Intra prediction is selected for a current chroma block, a corresponding luma block area is determined by locating a first upper-left pixel address of the corresponding luma block area corresponding to that of the current chroma block; one or more candidate luma coding modes are determined from a sub-block set consisting of one or more sub-blocks of the corresponding luma block area, where if the sub-block set consists of only one sub-block, the sub-block set excludes a corner sub-block located at a top-left corner of the corresponding luma block area; a current chroma Intra mode for the current chroma block is derived based on information comprising the candidate luma coding modes; and Intra-prediction encoding or decoding is applied to the current chroma block using the current chroma Intra mode derived.

公开(公告)号：US20190222859A1

公开(公告)日：2019-07-18

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 ,  H04N19/186 ,  H04N19/176 ,  H04N19/105 ,  H04N19/96 ,  H04N19/119

CPC classification number: H04N19/52 ,  H04N19/00 ,  H04N19/105 ,  H04N19/119 ,  H04N19/159 ,  H04N19/176 ,  H04N19/186 ,  H04N19/436 ,  H04N19/513 ,  H04N19/70 ,  H04N19/96

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：US20180131963A1

公开(公告)日：2018-05-10

申请号：US15564205

申请日：2016-04-13

Applicant: MEDIATEK INC.

Inventor： Tzu-Der CHUANG ,  Shan LIU ,  Xiaozhong XU

IPC: H04N19/593 ,  H04N19/105 ,  H04N19/176 ,  H04N19/11 ,  H04N19/70

CPC classification number: H04N19/593 ,  H04N19/105 ,  H04N19/11 ,  H04N19/159 ,  H04N19/176 ,  H04N19/51 ,  H04N19/70

Abstract: A method and apparatus of video coding using IntraBC (Intra Block Copy) for video data are disclosed. Restricted prediction is determined, in which one or more selected PU (prediction unit) sizes, PU prediction types or both are disabled or disallowed. Video coding is applied to the current block using coding modes including IntraBC prediction in accordance with the restricted prediction. The selected PU sizes, PU prediction types or both may correspond to 8×8 bi-prediction PU. In one example, the selected PU sizes, PU prediction types or both are disabled or disallowed for the restricted prediction except one or more conditions are determined to be satisfied. The conditions may correspond to at least one of two motion vectors of the 8×8 bi-prediction PU having integer values, the conditions may also correspond to at least one of motion vector components of the 8×8 bi-prediction PU having integer valueIntraBCIntraBCIntraBCIntraBCIntraBC.

公开(公告)号：US20170318302A1

公开(公告)日：2017-11-02

申请号：US15520575

申请日：2015-11-06

Applicant: MEDIATEK INC.

Inventor： Jing YE ,  Shan LIU ,  Xiaozhong XU

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

CPC classification number: H04N19/186 ,  H04N19/119 ,  H04N19/463 ,  H04N19/593 ,  H04N19/70 ,  H04N19/90 ,  H04N19/96

Abstract: A method of palette coding to apply the palette coding to sub-blocks of a coding unit and to allow each sub-block to use an individual palette table is disclosed. If the current coding block is not partitioned, the palette coding is applied to the current coding block using a first palette. If the current coding block is partitioned into multiple sub-blocks, the palette coding is applied to each sub-block using an individual second palette. Each sub-block may correspond to one prediction unit (PU). In another embodiment of the present invention, a method is disclosed that skips update of palette predictor such as last coded palette table, last coded palette size and palette predictor size associated with the current coding block if the current palette size is smaller than or equal to palette update size.

公开(公告)号：US20170310959A1

公开(公告)日：2017-10-26

申请号：US15521513

申请日：2015-10-28

Applicant: MEDIATEK INC.

Inventor： Ching-Yeh CHEN ,  Yu-Wen HUANG ,  Xiaozhong XU ,  Shan LIU

IPC: H04N19/105 ,  H04N19/593 ,  H04N19/182 ,  H04N19/176 ,  H04N19/117 ,  H04N19/82 ,  H04N19/11

CPC classification number: H04N19/105 ,  H04N19/11 ,  H04N19/117 ,  H04N19/176 ,  H04N19/182 ,  H04N19/593 ,  H04N19/82

Abstract: A method of Intra prediction filtering to determine whether to turn on or off the Intra prediction filter based on interleaved Intra prediction mode sets implicitly is disclosed. In one embodiment, initial Intra prediction block is derived based on neighboring reconstructed pixels of the current block. If the Intra prediction filter is on for the current Intra prediction mode, the Intra prediction filter is applied to the initial Intra prediction block to form a filtered Intra prediction block and Intra prediction encoding or decoding is applied to the current block using the filtered Intra prediction block as a predictor for the current block. For example, Intra gradient filter can be applied for even modes of Intra prediction modes from v to (v+8) and/or from h and (h+8). Bi-directional Intra prediction filter can be applied to some or all other modes.