公开(公告)号：US20190028731A1

公开(公告)日：2019-01-24

申请号：US16065320

申请日：2017-01-06

Applicant: MEDIATEK INC.

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

IPC: H04N19/52 ,  H04N19/159 ,  H04N19/105 ,  H04N19/567 ,  H04N19/176

Abstract: Methods and apparatus of Inter prediction for video coding performed by a video encoder or a video decoder that utilizes motion vector prediction (MVP) to code a motion vector (MV) associated with a block coded with coding modes including affine Inter mode are disclosed. According to one method, MVP pairs for the current block are derived based on neighbouring blocks related to two control points for representing a 4-parameter affine motion model associated with the current block. A final MVP pair is selected based on two MVs for each MVP pair. In another method, MVP sets for three control points are derived to represent a 6-parameter affine motion model associated with the current block. A final MVP set is selected and included in the Inter candidate list. According to another method, one or more decoder-side derived MVs are included in a MVP set for inclusion in the Inter candidate list.

公开(公告)号：US20180270479A1

公开(公告)日：2018-09-20

申请号：US15918646

申请日：2018-03-12

Applicant: MEDIATEK INC.

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

IPC: H04N19/117 ,  H04N19/154 ,  H04N19/182 ,  H04N19/172 ,  H04N19/82 ,  H04N19/119 ,  H04N19/597

CPC classification number: H04N19/117 ,  H04N19/119 ,  H04N19/14 ,  H04N19/154 ,  H04N19/17 ,  H04N19/172 ,  H04N19/176 ,  H04N19/182 ,  H04N19/597 ,  H04N19/82

Abstract: Aspects of the disclosure provide a method for non-local adaptive loop filtering. The method can include receiving reconstructed picture, dividing the picture into current patches, forming patch groups each including a current patch and a number of reference patches, determining a noise level for each of the patch groups, and denoising the patch groups with a non-local denoising technology. The determining a noise level for each of the patch groups can include calculating a pixel variance for a respective patch group, determining a pixel standard deviation (SD) of the respective patch group according to the calculated pixel variance by searching in a lookup table that indicates mapping relationship between patch group pixel SDs and patch group pixel variances, and calculating a noise level for the respective patch group based on a compression noise model that is a function of the pixel SD.

公开(公告)号：US20180152714A1

公开(公告)日：2018-05-31

申请号：US15578221

申请日：2016-06-03

Applicant: MEDIATEK INC.

Inventor： Yu-Chen SUN ,  Tzu-Der CHUANG ,  Han-Liang CHOU ,  Chia-Yun Cheng ,  Ching-Yeh CHEN ,  Yu-Wen Huang

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

CPC classification number: H04N19/186 ,  H04N19/176 ,  H04N19/423 ,  H04N19/433 ,  H04N19/51 ,  H04N19/593 ,  H04N19/70

Abstract: Methods of palette coding to reduce the required coding process are disclosed. According to one method, smaller blocks are derived from a large block. The histogram of the large block is derived based on the histograms of smaller blocks in the large block. According to another method, one or more palette tables are derived based on multiple blocks. One palette table is used for each of the multiple blocks. According to yet another method, index map transpose is performed in the parsing stage according to the transpose flag of the index map. Accordingly, a buffer to store the transpose flags can be saved. According to still yet another method, the palette predictor update is performed using an index mapping table to avoid the need for shuffling the contents of the palette predictor stored in a palette buffer.

公开(公告)号：US20180103260A1

公开(公告)日：2018-04-12

申请号：US15578184

申请日：2016-06-03

Applicant: MEDIATEK INC.

Inventor： Tzu-Der CHUANG ,  Ping CHAO ,  Ching-Yeh CHEN ,  Yu-Chen Sun ,  Chih-Ming WANG ,  Chia-Yun Cheng ,  Han-Liang Chou ,  Yu-Wen Huang

IPC: H04N19/423 ,  H04N19/51

CPC classification number: H04N19/186 ,  H04N19/176 ,  H04N19/423 ,  H04N19/433 ,  H04N19/51 ,  H04N19/593 ,  H04N19/70

Abstract: A method and apparatus of sharing an on-chip buffer or cache memory for a video coding system using coding modes including Inter prediction mode or Intra Block Copy (IntraBC) mode are disclosed. At least partial pre-deblocking reconstructed video data of a current picture is stored in an on-chip buffer or cache memory. If the current block is coded using IntraBC mode, the pre-deblocking reconstructed video data of the current picture stored in the on-chip buffer or cache memory are used to derive IntraBC prediction for the current block. In some embodiments, if the current block is coded using Inter prediction mode, Inter reference video data from the previous picture stored in the on-chip buffer or cache memory are used to derive Inter prediction for the current block. In another embodiment, the motion compensation/motion estimation unit is shared by the two modes.

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：US20170295366A1

公开(公告)日：2017-10-12

申请号：US15632481

申请日：2017-06-26

Applicant: MEDIATEK INC.

Inventor： Ching-Yeh CHEN ,  Chih-Wei HSU ,  Chia-Yang TSAI ,  Yu-Wen HUANG

IPC: H04N19/11 ,  H04N19/59 ,  H04N19/597 ,  H04N19/159 ,  H04N19/82 ,  H04N19/186 ,  H04N19/593

CPC classification number: H04N19/186 ,  H04N19/11 ,  H04N19/159 ,  H04N19/182 ,  H04N19/59 ,  H04N19/593 ,  H04N19/597 ,  H04N19/82

Abstract: In one implementation, a method operates by receiving neighboring reconstructed first-color pixels and current reconstructed first-color pixels of a current first-color block and receiving neighboring reconstructed second-color pixels of a current second-color block collocated with the current first-color block. The method then determines linear model (LM) parameters according to a linear model for one or more LM Intra modes. The method then receives input data associated with current second-color pixels of the current second-color block and generates a cross-color Intra predictor from the current reconstructed first-color pixels of the current first-color block using the LM parameters associated with a LM Intra mode selected from said one or more LM Intra modes. Finally, the method applies cross-color Intra prediction encoding or decoding to the current second-color pixels of the current second-color block using the cross-color Intra predictor for the selected LM Intra mode.

公开(公告)号：US20160234499A1

公开(公告)日：2016-08-11

申请号：US15132454

申请日：2016-04-19

Applicant: MediaTek Inc.

Inventor： Tzu-Der CHUANG ,  Ching-Yeh CHEN ,  Yu-Wen Huang ,  Shaw-Min Lei ,  Chih-Ming FU ,  Chia-Yang TSAI

IPC: H04N19/13 ,  H04N19/154 ,  H04N19/187 ,  H04N19/146

CPC classification number: H04N19/13 ,  H04N19/117 ,  H04N19/119 ,  H04N19/146 ,  H04N19/154 ,  H04N19/187 ,  H04N19/30 ,  H04N19/33 ,  H04N19/61 ,  H04N19/70 ,  H04N19/82 ,  H04N19/86 ,  H04N19/96

Abstract: A method and apparatus for scalable video coding are disclosed, wherein the video data is configured into a Base Layer (BL) and an Enhancement Layer (EL) and wherein the EL has higher spatial resolution or better video quality than the BL. According to embodiments of the present invention, information from the base layer is exploited for coding the enhancement layer. The information coding for the enhancement layer includes CU structure, motion information, motion information, MVP/merge candidates, intra prediction mode, residual quadtree information, texture information, residual information, context adaptive entropy coding, Adaptive Lop Filter (ALF), Sample Adaptive Offset (SAO), and deblocking filter.

Abstract translation: 公开了一种用于可缩放视频编码的方法和装置，其中视频数据被配置为基本层（BL）和增强层（EL），并且其中EL具有比BL更高的空间分辨率或更好的视频质量。 根据本发明的实施例，利用来自基础层的信息来对增强层进行编码。 增强层的信息编码包括CU结构，运动信息，运动信息，MVP /合并候选，帧内预测模式，残余四叉树信息，纹理信息，残差信息，上下文自适应熵编码，自适应Lop滤波器（ALF） 偏移（SAO）和去块滤波器。

公开(公告)号：US20250119572A1

公开(公告)日：2025-04-10

申请号：US18730921

申请日：2023-01-16

Applicant: MEDIATEK INC.

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

IPC: H04N19/513 ,  H04N19/105 ,  H04N19/139 ,  H04N19/176

Abstract: A method for constraining multi-pass decoder-side motion vector refinement (MP-DMVR) is provided. A video coder receives data for a block of pixels to be encoded or decoded as a current block of a current picture of a video. A video coder receives a motion vector that references a block of pixels in a reference picture based on the received data. A video coder refines the motion vector in a plurality of refinement passes by examining pixels in the reference picture that are identified based on the refined motion vector. The refinement of the motion vector is constrained by a refinement range. The video coder encodes or decodes the current block by using the refined motion vector to produce prediction residuals or to reconstruct the current block.