公开(公告)号：US20210281846A1

公开(公告)日：2021-09-09

申请号：US16332435

申请日：2016-09-13

Applicant: MEDIATEK INC.

Inventor： Shih-Ta HSIANG ,  Shaw-Min LEI ,  Yu-Wen HUANG ,  Yu-Chen SUN

IPC: H04N19/126 ,  H04N19/176 ,  H04N19/167 ,  H04N19/70

Abstract: A method and apparatus for processing transform blocks of video data performed by a video encoder or a video decoder are disclosed. A plurality of quantization matrix sets are determined, where each quantization matrix set includes one or more quantization matrices corresponding to different block types. For a transform block corresponding to a current block in a current picture, a selected quantization matrix set is determined from the plurality of quantization matrix sets for the transform block. Quantization process or de-quantization process is applied to the transform block using a corresponding quantization matrix from the selected quantization matrix set.

公开(公告)号：US20210136420A1

公开(公告)日：2021-05-06

申请号：US17087671

申请日：2020-11-03

Applicant: MEDIATEK INC.

Inventor： Chen-Yen LAI ,  Shih-Ta HSIANG ,  Olena CHUBACH ,  Tzu-Der CHUANG ,  Ching-Yeh CHEN ,  Lulin CHEN

IPC: H04N19/70 ,  H04N19/184 ,  H04N19/172

Abstract: Methods and apparatus for video coding are disclosed. According to one method, a bitstream is generated or received, where the bitstream includes a first syntax and a second syntax. The first syntax is related to a target number of bits used to represent a set of third syntaxes and each third syntax specifies one subpicture ID for one subpicture in a set of subpictures. The second syntax is related to a total number of subpictures in the set of subpicture, where a first number that can be represented by the target number of bits is equal to or greater than the total number of subpictures. According to another method, the subpicture ID syntaxes have different values for different subpictures.

公开(公告)号：US20210037261A1

公开(公告)日：2021-02-04

申请号：US16941834

申请日：2020-07-29

Applicant: MEDIATEK INC.

Inventor： Shih-Ta HSIANG

IPC: H04N19/61 ,  H04N19/70 ,  H04N19/105 ,  H04N19/176

Abstract: Method and apparatus for encoding and decoding prediction residues in a video coding system also disclosed. At the decoder side, a Rice parameter for the target transform coefficient is determined based on a local sum of absolute levels of neighboring transform coefficients of the target transform coefficient. A dependent quantization state is determined and a zero-position variable is determined based on the dependent quantization state and the Rice parameter. One or more coded bits associated with a first syntax element for the target transform coefficient in a transform block are parsed and decoded using one or more codes including a Golomb-Rice code with the Rice parameter, where the first syntax element corresponds to a modified absolute level value of the target transform coefficient. An absolute level value of the target transform coefficient is derived according to the zero-position variable and the first syntax element.

公开(公告)号：US20180278958A1

公开(公告)日：2018-09-27

申请号：US15928917

申请日：2018-03-22

Applicant: MEDIATEK INC.

Inventor： Shih-Ta HSIANG

IPC: H04N19/60 ,  H04N19/186 ,  H04N19/176 ,  H04N19/70

Abstract: A picture defined in video data is partitioned into blocks that include a luminance (luma) transform block and a chrominance (chroma) transform block. One or more constraints pertaining to the picture are determined from high-level syntax elements and transform skipping of one of both of the luma transform block and the chroma transform block is disallowed if the constraints are not met. The video data are encoded in a bitstream along with an indication that the transform of the luma transform block or the chroma transform block is skipped in response to the transform being skipped.

公开(公告)号：US20230188753A1

公开(公告)日：2023-06-15

申请号：US18053427

申请日：2022-11-08

Applicant: MEDIATEK INC.

Inventor： Shih-Ta HSIANG

IPC: H04N19/61 ,  H04N19/18 ,  H04N19/186 ,  H04N19/182 ,  H04N19/167 ,  H04N19/70 ,  H04N19/13 ,  H04N19/11 ,  H04N19/12

CPC classification number: H04N19/61 ,  H04N19/18 ,  H04N19/186 ,  H04N19/182 ,  H04N19/167 ,  H04N19/70 ,  H04N19/13 ,  H04N19/11 ,  H04N19/12

Abstract: A method and apparatus for joint sign prediction of transform coefficients. At the encoder side, a maximum number is determined according to coding context of the current block. A set of jointly predicted coefficient signs associated with a set of selected transform coefficients is determined where a total number of the set of jointly predicted coefficient signs is equal to or smaller than the maximum number. Joint sign prediction for the set of jointly predicted coefficient signs is determined by selecting one hypothesis from a group of hypotheses corresponding to combinations of the set of jointly predicted coefficient signs that achieves a minimum cost.

公开(公告)号：US20220256201A1

公开(公告)日：2022-08-11

申请号：US17608226

申请日：2020-04-30

Applicant: MEDIATEK INC.

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

IPC: H04N19/82 ,  H04N19/174 ,  H04N19/186 ,  H04N19/117 ,  H04N19/136

Abstract: Encoding methods and apparatuses comprise determining parameters of a specific process for a current slice, signaling in one or more Adaptive Parameter Sets (APSs), performing the specific process using the parameters, signaling an APS ID of each signaled APS in a slice header, and encoding the current slice. Each APS is classified into a category according to a type of data carried by the APS. The APS ID of each signaled APS is counted in a category associated with the specific process and is independent of other categories. Decoding methods and apparatuses comprise parsing an APS ID of each referenced APS from a slice header of a current slice for a specific process, determining parameters from each referenced APS according to the parsed APS ID and a category associated with the specific process, performing the specific process on the current slice and decoding the current slice.

公开(公告)号：US20210385436A1

公开(公告)日：2021-12-09

申请号：US17341879

申请日：2021-06-08

Applicant: MEDIATEK INC.

Inventor： Shih-Ta HSIANG ,  Lulin CHEN ,  Chih-Wei HSU ,  Olena CHUBACH

IPC: H04N19/105 ,  H04N19/172 ,  H04N19/159 ,  H04N19/46

Abstract: Method and apparatus for signaling or parsing constrained active entries in reference picture lists for multi-layer coding are disclosed. For the decoder side, when the current picture is a RADL (Random Access Decodable Leading) picture, reference picture list 0 or reference picture list 1 of the current picture is mandatorily required to contain no active entry corresponding to a RASL (Random Access Skipped Leading) picture with pps_mixed_nalu_types_in_pic_flag equal to 0 or a picture that precedes an associated IRAP (Intra Random Access Point) picture in decoding order, and wherein an active entry in the reference picture list 0 or the reference picture list 1 of the RADL picture can refer to a RASL picture with the pps_mixed_nalu_types_in_pic_flag equal to 1 and a referenced RASL picture either belongs to the same layer or a different layer than a layer containing the current picture which is the RADL picture.

公开(公告)号：US20210321105A1

公开(公告)日：2021-10-14

申请号：US17277002

申请日：2019-09-02

Applicant: MEDIATEK INC.

Inventor： Shih-Ta HSIANG

IPC: H04N19/126 ,  H04N19/176 ,  H04N19/60 ,  H04N19/18

Abstract: Processing methods and apparatuses for video data comprise receiving input data associated with a current transform block in a current video picture, determining if a size of the current transform block is a power of 4, determining a normalized quantization or dequantization scaling factor, generating transform coefficient levels by applying a quantization processing to scaled transform coefficients in the current transform block or generating scaled transform coefficients by applying an inverse quantization processing to transform coefficient levels in the current transform block, and encoding or decoding the current transform block. The quantization processing comprises scaling the scaled transform coefficients by the normalized quantization scaling factor and the inverse quantization processing comprises scaling the transform coefficient levels by the normalized dequantization scaling factor.

公开(公告)号：US20210160479A1

公开(公告)日：2021-05-27

申请号：US16952255

申请日：2020-11-19

Applicant: MEDIATEK INC.

Inventor： Shih-Ta HSIANG

IPC: H04N19/103 ,  H04N19/176 ,  H04N19/70 ,  H04N19/172

Abstract: Video processing methods and apparatuses in a video coding system include receiving input video data of a current block in a current picture, determining whether a transform skip mode is enabled for the current picture, signaling or parsing a syntax element associated with a size constraint for enabling the transform skip mode in a SPS referred to by the current picture when the transform skip mode is enabled, determining whether the transform skip mode is applied to the current block when the current block satisfies the size constraint, processing residues of the current block according to the transform skip mode when the transform skip mode is applied to the current block, and encoding or decoding the current block. An enabling flag is signaled in a high-level syntax set or parsed from the high-level syntax set to determine whether the transform skip mode is enabled for the current picture.

公开(公告)号：US20210092394A1

公开(公告)日：2021-03-25

申请号：US17048208

申请日：2019-04-17

Applicant: MEDIATEK INC.

Inventor： Chia-Ming TSAI ,  Chih-Wei HSU ,  Tzu-Der CHUANG ,  Ching-Yeh CHEN ,  Shih-Ta HSIANG ,  Yu-Wen HUANG ,  Zhi-Yi LIN

IPC: H04N19/132 ,  H04N19/119 ,  H04N19/176 ,  H04N19/70 ,  H04N19/96 ,  H04N19/172 ,  H04N19/61 ,  H04N19/46 ,  H04N19/159 ,  H04N19/186

Abstract: A method and apparatus for video coding using block partition are disclosed. According to the present invention, a partition structure corresponding to recursively partitioning a current block into smaller TU (transform unit) blocks until the partition structure reaches a maximum allowed split depth or until a block size of at least one of smaller TU blocks is a supported core transform size, where the current block is partitioned into final smaller TU blocks according to the partition structure. A transform coding process is applied to the current block according to the partition structure, where the transform coding process is skipped for at least one of the final smaller TU blocks. A flag can be signalled for the current block to indicate whether the current block is allowed to skip the transform coding process for said at least one of the final smaller TU blocks.