公开(公告)号：US20210203998A1

公开(公告)日：2021-07-01

申请号：US17269620

申请日：2019-08-19

Applicant: MEDIATEK INC.

Inventor： Shih-Ta HSIANG

IPC: H04N19/70 ,  H04N19/50 ,  H04N19/176 ,  H04N19/60 ,  H04N19/124

Abstract: A method and apparatus or decoding prediction residues in a video coding system are disclosed. According to this method, a first syntax element to a fourth syntax element are signalled or parsed in a first coding pass for at least sub-block. The current residual block is encoded or decoded using information comprising the first syntax element, the second syntax element, the third syntax element, and the fourth syntax element. The first syntax element indicates whether an absolute value of a current transform coefficient level is greater than 0. The second syntax element indicates whether the absolute value of the current transform coefficient level is greater than 1. The third syntax element indicates a parity of the current transform coefficient level. The fourth syntax element indicates whether the absolute value of the current transform coefficient level downward shifted by 1 is greater than 1.

公开(公告)号：US20160198154A1

公开(公告)日：2016-07-07

申请号：US14916480

申请日：2014-10-14

Applicant: MediaTek Inc.

Inventor： Shih-Ta HSIANG

IPC: H04N19/103 ,  H04N19/70 ,  H04N19/18 ,  H04N19/65 ,  H04N19/124 ,  H04N19/174 ,  H04N19/172 ,  H04N19/44 ,  H04N19/91

CPC classification number: H04N19/103 ,  H04N19/12 ,  H04N19/124 ,  H04N19/157 ,  H04N19/172 ,  H04N19/174 ,  H04N19/18 ,  H04N19/44 ,  H04N19/65 ,  H04N19/70 ,  H04N19/91

Abstract: A method of efficient lossless mode syntax signaling for a coding system supporting both lossless and lossy coding is disclosed. In one embodiment, a first syntax element is incorporated in a picture level to indicate whether to use a forced lossless coding mode if lossless coding is allowed for the current picture. If the first syntax indicates that the forced lossless coding mode is selected, all coding units in the slices of the picture are coded using lossless coding. If the first syntax indicates that the forced lossless coding mode is not selected, each coding unit in a slice of the picture can be coded according to a second syntax element indicating whether each coding unit is coded using lossless coding or not. In another embodiment, the forced lossless mode can be applied to coding units on a slice by slice basis.

Abstract translation: 公开了一种用于支持无损和有损编码的编码系统的有效的无损模式语法信令的方法。 在一个实施例中，如果允许当前图像的无损编码，则第一语法元素被并入画面级，以指示是否使用强制无损编码模式。 如果第一语法指示强制无损编码模式被选择，则图像片中的所有编码单元都使用无损编码进行编码。 如果第一语法指示不选择强制无损编码模式，则可以根据指示每个编码单元是否使用无损编码进行编码的第二语法元素来编码图片片中的每个编码单元。 在另一实施例中，强制无损模式可以逐个片地应用于编码单元。

公开(公告)号：US20220232205A1

公开(公告)日：2022-07-21

申请号：US17609702

申请日：2020-05-07

Applicant: MEDIATEK INC.

Inventor： Man-Shu CHIANG ,  Chih-Wei HSU ,  Tzu-Der CHUANG ,  Ching-Yeh CHEN ,  Yu-Wen HUANG ,  Shih-Ta HSIANG

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

Abstract: Method and apparatus of video coding are disclosed. According to one method, in the decoder side, a predefined Intra mode is assigned to a neighboring block adjacent to the current luma block when the neighboring block satisfies one or more conditions. An MPM (Most Probable Mode) list is derived based on information comprising at least one of neighboring Intra modes. A current Intra mode is derived utilizing the MPM list. The current luma block is decoded according to the current Intra mode According to another method, a predefined Intra mode is assigned to a neighboring block adjacent to the current luma block if the neighboring block is coded in BDPCM (Block-based Delta Pulse Code Modulation) mode, where the predefined Intra mode is set to horizontal mode or vertical mode depending on prediction direction used by the BDPCM mode.

公开(公告)号：US20220224891A1

公开(公告)日：2022-07-14

申请号：US17609707

申请日：2020-05-06

Applicant: MEDIATEK INC.

Inventor： Man-Shu CHIANG ,  Chih-Wei HSU ,  Tzu-Der CHUANG ,  Ching-Yeh CHEN ,  Yu-Wen HUANG ,  Shih-Ta HSIANG

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

Abstract: A method and apparatus of prediction for video coding are disclosed. According to one method, a luma Intra prediction mode is determined for a corresponding luma block collocated with the current chroma block, where a predefined mode is assigned to the luma Intra prediction mode when the corresponding luma block collocated with the current chroma block satisfies one or more conditions. A chroma Intra prediction mode is determined for the current chroma block according to the luma Intra prediction mode. The current chroma block is then encoded or decoded according to the chroma Intra prediction mode. According to another method, a predefined mode is assigned to Intra prediction mode for the current block when the current block satisfies one or more conditions. The current block is then encoded or decoded according to the Intra prediction mode.

公开(公告)号：US20210392325A1

公开(公告)日：2021-12-16

申请号：US17343914

申请日：2021-06-10

Applicant: MEDIATEK INC.

Inventor： Shih-Ta HSIANG

IPC: H04N19/119 ,  H04N19/172 ,  H04N19/96 ,  H04N19/105 ,  H04N19/159 ,  H04N19/70

Abstract: Video processing methods and apparatuses include receiving input data associated with a current picture composed of multiple Coding Tree Units (CTUs) for encoding or decoding, partitioning the current picture into multiple subpictures, determining one or more reference pictures for inter coding the current picture, and encoding or decoding one or more blocks in one or more CTUs of the current picture by inter coding using the one or more reference pictures. Each of the reference pictures used for inter coding the current picture has a same CTU size as that of the current picture when the reference picture is not an Inter Layer Reference Picture (ILRP) containing one subpicture.

公开(公告)号：US20190273930A1

公开(公告)日：2019-09-05

申请号：US16414992

申请日：2019-05-17

Applicant: MEDIATEK INC.

Inventor： Shih-Ta HSIANG ,  Tzu-Der CHUANG ,  Yu-Wen HUANG

IPC: H04N19/186 ,  G06T9/00 ,  H04N19/593 ,  H04N19/70 ,  H04N19/91 ,  H04N19/182

Abstract: A method and apparatus for video coding using coding modes including a palette mode are disclosed. In one embodiment, the total number of palette indices in the current block is coded into a binary string using a TR (Truncated Rice) binarization process with the Rice parameter to generate a prefix part and using an EGk (k-th order Exp-Golomb) binary process to generate a suffix part for the binary string, or using the EGk binarization process with the Rice parameter (k). The suffix part is allowed to be empty. In another embodiment, a Rice parameter is determined. If the Rice parameter is equal to or greater than log-base-2 of current block size, the variable related to a total number of palette indices in the current block of video data is binarized into a binary string using a fixed-length code with bit length equal to log-base-2 of current block size.

公开(公告)号：US20180007359A1

公开(公告)日：2018-01-04

申请号：US15542732

申请日：2016-01-29

Applicant: MEDIATEK INC.

Inventor： Shih-Ta HSIANG

IPC: H04N19/13 ,  H04N19/184 ,  H04N19/169 ,  H04N19/70

CPC classification number: H04N19/13 ,  H04N19/139 ,  H04N19/184 ,  H04N19/1887 ,  H04N19/52 ,  H04N19/70 ,  H04N19/91

Abstract: A general entropy coding method for source symbols is disclosed. This method determines a prefix part and any suffix part for the current symbol. The method divides prefix of the source symbol into at least two parts by comparing a test value related to the prefix part against a threshold. If the test value is greater than or equal to the threshold, the method derives a first binary string by binarizing a first prefix part related to the prefix part using a first variable length code. If the test value related to the prefix part is less than the threshold, the method derives a second binary string by binarizing a second prefix part related to the prefix part using a second variable length code or a first fixed-length code. The method then encodes at least one of the first binary string and the second binary string using a CABAC mode.

公开(公告)号：US20170223379A1

公开(公告)日：2017-08-03

申请号：US15514926

申请日：2015-10-08

Applicant: MEDIATEK INC.

Inventor： Tzu-Der CHUANG ,  Xiaozhong XU ,  Yu-Chen SUN ,  Shih-Ta HSIANG ,  Shan LIU

IPC: H04N19/593 ,  H04N19/513 ,  H04N19/167 ,  H04N19/176

CPC classification number: H04N19/593 ,  H04N19/513 ,  H04N19/52

Abstract: A method of video coding using coding modes including IntraBC mode (Intra-block copy mode) for a picture is disclosed. The system determines whether the current reference block is located above a current coding unit (CU) containing the current prediction unit (PU) in a vertical direction and whether the current reference block is located on a left side of the current CU in a horizontal direction based on the original block vector (BV). If both results are not true, the original BV is clipped to a clipped BV so that a relocated reference block corresponding to the clipped BV is above the current CU in the vertical direction or to the left side of the current CU in the horizontal direction. The clipped BV is used as a predictor for encoding or decoding of a current BV or used for IntraBC encoding or decoding of the current PU.

公开(公告)号：US20250039460A1

公开(公告)日：2025-01-30

申请号：US18716344

申请日：2022-09-21

Applicant: MEDIATEK INC.

Inventor： Shih-Ta HSIANG

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

Abstract: A method and apparatus for joint sign prediction of transform coefficients of residual blocks in a video coding system are disclosed. At the encoder side, a transform coefficient region or an index value range is determined according to coding context associated with the current block. A set of signs associated with a set of selected transform coefficients are determined for joint sign prediction are determined according to the transform coefficient region or the index value range. Joint sign prediction for the set of signs is determined by selecting a hypothesis from a group of hypotheses for the set of signs that achieves a minimum cost. The sign prediction is then used for coding the set of signs. A corresponding method and apparatus for the decoder side is also disclosed.

公开(公告)号：US20210400270A1

公开(公告)日：2021-12-23

申请号：US17343897

申请日：2021-06-10

Applicant: MEDIATEK INC.

Inventor： Shih-Ta HSIANG

IPC: H04N19/119 ,  H04N19/96 ,  H04N19/172 ,  H04N19/70 ,  H04N19/105

Abstract: Video processing methods and apparatuses include receiving input video data associated with a current picture composed of multiple Coding Tree Units (CTUs) for encoding or decoding, determining a number of subpictures, partitioning the current picture into one or more subpictures, and encoding or decoding each subpicture in the current picture. Each subpicture contains multiple complete CTUs and boundaries of each subpicture are aligned with grids of the current picture in units of CTUs. The number of subpictures in the current picture is limited by an allowed maximum number of slices.