公开(公告)号：US20190394461A1

公开(公告)日：2019-12-26

申请号：US16558759

申请日：2019-09-03

Applicant: MEDIATEK INC.

Inventor： Shan LIU ,  Xiaozhong XU ,  Jing YE

IPC: H04N19/107 ,  H04N19/159 ,  H04N19/46

Abstract: A method processes video data by intra prediction in a video coding system. In one implementation, the method receives input data associated with a current block in a current picture, wherein the current block is a non-square block and is coded or to be coded by intra prediction. The method then determines a first set of angular intra prediction modes for the longer side of the current block, wherein a number of the first set of the angular intra prediction modes is greater than a number of a second set of angular intra prediction modes for the shorter side of the current block. The method then determines a current intra prediction mode to derive an intra predictor for the current block, and encodes or decoding the current block according to the current intra prediction mode.

公开(公告)号：US20170374369A1

公开(公告)日：2017-12-28

申请号：US15629877

申请日：2017-06-22

Applicant: MEDIATEK INC.

Inventor： Tzu-Der CHUANG ,  Ching-Yeh CHEN ,  Yu-Wen HUANG ,  Jing YE ,  Shan LIU ,  Xiaozhong XU ,  Jungsun KIM

IPC: H04N19/159 ,  H04N19/593 ,  H04N19/176 ,  H04N19/70 ,  H04N19/105

CPC classification number: H04N19/159 ,  H04N19/105 ,  H04N19/11 ,  H04N19/176 ,  H04N19/44 ,  H04N19/593 ,  H04N19/70

Abstract: Video processing methods and apparatuses receive input data associated with a current block, determine an actual intra prediction mode for the current block by performing decoder side intra mode derivation, perform intra prediction based on the actual intra prediction mode, replace the actual intra prediction mode with a pseudo mode when processing the current block by an intra mode dependent tool in syntax signaling or parsing, and encode or decode the current block. The pseudo mode referenced by the intra mode dependent tool is a predefined mode or a derived mode, which is referenced as the intra prediction mode for blocks coded using decoder side intra mode derivation, or is referenced by the intra mode dependent tool as the intra prediction mode for all intra prediction coded blocks.

公开(公告)号：US20170353730A1

公开(公告)日：2017-12-07

申请号：US15611841

申请日：2017-06-02

Applicant: MEDIATEK INC.

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

IPC: H04N19/159 ,  H04N19/122 ,  H04N19/96 ,  H04N19/70 ,  H04N19/182 ,  H04N19/176

CPC classification number: H04N19/159 ,  H04N19/105 ,  H04N19/11 ,  H04N19/119 ,  H04N19/122 ,  H04N19/176 ,  H04N19/182 ,  H04N19/70 ,  H04N19/96

Abstract: A method and apparatus for video coding using template-based Intra prediction are disclosed. According to one method, where determining whether to apply the template-based Intra prediction or one or more parameters associated with the template-based Intra prediction depends on the current block size. According to yet another method, the quad-tree plus binary tree (QTBT) structure is used to partition an image or one or more areas of the current image into blocks. If the template-based Intra prediction is used for a current block and the current block is non-square, the width and height of the L-shaped reference pixel line are determined according to width and height of the current block. The L-shaped reference pixel line comprises a top reference pixel segment above the top template and a left reference pixel segment adjacent to a left side of the left template

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.