公开(公告)号：US11956469B2

公开(公告)日：2024-04-09

申请号：US17603505

申请日：2020-04-15

Applicant: MEDIATEK INC.

Inventor： Man-Shu Chiang ,  Chih-Wei Hsu ,  Tzu-Der Chuang ,  Ching-Yeh Chen

IPC: H04N19/60 ,  H04N19/12 ,  H04N19/167 ,  H04N19/176 ,  H04N19/18 ,  H04N19/186 ,  H04N19/70

CPC classification number: H04N19/60 ,  H04N19/12 ,  H04N19/167 ,  H04N19/176 ,  H04N19/18 ,  H04N19/186 ,  H04N19/70

Abstract: Video processing methods and apparatuses implemented in a video encoding or decoding system with conditional secondary transform signaling. The video encoding system determines and applies a transform operation to residuals of a transform block to generate final transform coefficients, and adaptively signals a secondary transform index according to a position of a last significant coefficient in the transform block. A value of the secondary transform index is determined according to the transform operation. The video decoding system parses last significant coefficient position syntax of each transform block in the current block from a video bitstream to determine a position of a last significant coefficient for each transform block, and infers inverse secondary transform is not applied to the current block according to the positions of the last significant coefficients; otherwise, the video decoding system determines an inverse transform operation by parsing a secondary transform index from the video bitstream.

公开(公告)号：US11917185B2

公开(公告)日：2024-02-27

申请号：US17537699

申请日：2021-11-30

Applicant: MEDIATEK INC.

Inventor： Man-Shu Chiang ,  Chih-Wei Hsu ,  Tzu-Der Chuang ,  Ching-Yeh Chen ,  Yu-Wen Huang

IPC: H04N19/513 ,  H04N19/105 ,  H04N19/159 ,  H04N19/176 ,  H04N19/46 ,  H04N19/80

CPC classification number: H04N19/513 ,  H04N19/105 ,  H04N19/159 ,  H04N19/176 ,  H04N19/46 ,  H04N19/80

Abstract: A method and apparatus of Inter prediction for video coding using Multi-hypothesis (MH) are disclosed. If an MH mode is used for the current block: at least one MH candidate is derived using reduced reference data by adjusting at least one coding-control setting; an Inter candidate list is generated, where the Inter candidate list comprises said at least one MH candidate; and current motion information associated with the current block is encoded using the Inter candidate list at the video encoder side or the current motion information associated with the current block is decoded at the video decoder side using the Merge candidate list. The coding control setting may correspond to prediction direction setting, filter tap setting, block size of reference block to be fetched, reference picture setting or motion limitation setting.

公开(公告)号：US11838557B2

公开(公告)日：2023-12-05

申请号：US17726713

申请日：2022-04-22

Applicant: MEDIATEK INC.

Inventor： Shih-Chun Chiu ,  Chih-Wei Hsu ,  Ching-Yeh Chen ,  Chun-Chia Chen ,  Tzu-Der Chuang ,  Yu-Wen Huang

IPC: H04N19/82 ,  H04N19/117 ,  H04N19/124 ,  H04N19/186 ,  H04N19/147

CPC classification number: H04N19/82 ,  H04N19/117 ,  H04N19/124 ,  H04N19/147 ,  H04N19/186

Abstract: Video encoding methods and apparatuses include receiving reconstructed video samples, determining an initial clipping setting for ALF coefficients, deriving clipping setting candidates from the initial clipping setting. ALF coefficients for the initial clipping setting and the clipping setting candidates are derived by solving inverse matrices, where partial intermediate results of solving ALF coefficients are shared by two or more clipping settings. A distortion value corresponds to the derived ALF coefficients for each clipping setting is computed, and final clipping indices for final ALF coefficients are determined according to the distortion values. ALF filtering is applied to the reconstructed video samples based on the final ALF coefficients and the final clipping indices.

公开(公告)号：US11785258B2

公开(公告)日：2023-10-10

申请号：US16980920

申请日：2019-03-25

Applicant: MEDIATEK INC.

Inventor： Shih-Ta Hsiang ,  Zhi-Yi Lin ,  Tzu-Der Chuang ,  Ching-Yeh Chen ,  Chih-Wei Hsu

IPC: H04N19/70 ,  H04N19/119 ,  H04N19/176 ,  H04N19/96

CPC classification number: H04N19/70 ,  H04N19/119 ,  H04N19/176 ,  H04N19/96

Abstract: A method and apparatus of video coding for a video encoding system or video decoding system are disclosed. According to one method, the current block region is partitioned into one or more leaf blocks using quadtree (QT) partition and/or 1D (one-dimensional) partition by firstly signalling or parsing a first syntax element to indicate whether the current block region is split into multiple smaller blocks. According to a second method, a target syntax model from multiple syntax models is determined. The current block region is partitioned into one or more leaf blocks using QT partition and/or 1D partition and signalling block partition information according to the target syntax model at an encoder side, or the block partition information is parsed according to the target syntax model and the current block region is partitioned into one or more leaf blocks at a decoder side.

公开(公告)号：US20230199217A1

公开(公告)日：2023-06-22

申请号：US17992797

申请日：2022-11-22

Applicant: MediaTek Inc.

Inventor： Cheng-Yen Chuang ,  Man-Shu Chiang ,  Yu-Ling Hsiao ,  Chun-Chia Chen ,  Chih-Wei Hsu ,  Tzu-Der Chuang ,  Ching-Yeh Chen ,  Yu-Wen Huang

IPC: H04N19/577 ,  H04N19/176 ,  H04N19/172 ,  H04N19/154 ,  H04N19/52

CPC classification number: H04N19/577 ,  H04N19/176 ,  H04N19/172 ,  H04N19/154 ,  H04N19/52

Abstract: A video encoder receives raw pixel data to be encoded as a current block of a current picture of a video into a bitstream. The video encoder identifies multiple candidate bi-prediction positions for the current block, including a center position, a first set of offset positions, and a second set of offset positions. The first set of offset positions and the second set of offset positions interleave each other. The encoder computes distortion values for each of the candidate bi-prediction positions based on several possible weighting parameter values. The distortion values for the center position are based on each of the several possible weighting parameter values. The distortion values for the first set of offset positions are based on a first subset of the possible weighting parameter values. The distortion values for the second set of offset positions are based on a second subset of the possible weighting parameter values.

公开(公告)号：US11356689B2

公开(公告)日：2022-06-07

申请号：US16920209

申请日：2020-07-02

Applicant: MEDIATEK INC.

Inventor： Chen-Yen Lai ,  Tzu-Der Chuang ,  Ching-Yeh Chen ,  Chih-Wei Hsu

IPC: H04N19/46 ,  H04N19/139 ,  H04N19/107 ,  H04N19/172 ,  H04N19/436 ,  H04N19/70

Abstract: A method of video decoding at a decoder can include receiving a bitstream including encoded data of a picture, decoding a plurality of coding units (CUs) in the picture based on motion information stored in a history-based motion vector prediction (HMVP) table, resetting the HMVP table for every N CTU rows. The method also provides updating the HMVP table with the motion information of the last Q of the plurality of CUs.

公开(公告)号：US11343541B2

公开(公告)日：2022-05-24

申请号：US17051269

申请日：2019-04-29

Applicant: MEDIATEK INC.

Inventor： Chia-Ming Tsai ,  Chun-Chia Chen ,  Chih-Wei Hsu ,  Ching-Yeh Chen ,  Tzu-Der Chuang

IPC: H04N19/52 ,  H04N19/85 ,  H04N19/96 ,  H04N19/139 ,  H04N19/159 ,  H04N19/176 ,  H04N19/117

Abstract: A video coder that implements illumination compensation is provided. The video coder receives a first block of pixels in a first video picture to be coded as a current block, wherein the current block is associated with a motion vector that references a second block of pixels in a second video picture as a reference block. The video coder performs inter-prediction for the current block by using the motion vector to generate a set of motion-compensated pixels for the current block. The video coder modifies the set of motion-compensated pixels of the current block by applying a linear model that is computed based on neighboring samples of the reference block and of the current block. The neighboring samples are identified based on a position of the current block within a larger block.

公开(公告)号：US11297320B2

公开(公告)日：2022-04-05

申请号：US17143823

申请日：2021-01-07

Applicant: MEDIATEK INC.

Inventor： Chen-Yen Lai ,  Chih-Wei Hsu ,  Tzu-Der Chuang ,  Ching-Yeh Chen

IPC: H04N19/00 ,  H04N19/124 ,  H04N19/96 ,  H04N19/184

Abstract: A video decoder parses a sequence parameter set (SPS) that is applicable to a current sequence of video pictures that includes the current picture, the SPS comprises a first dependent quantization flag and a first sign hiding flag. When the first dependent quantization flag indicates that dependent quantization is enabled for the current sequence, the decoder parses a second dependent quantization flag for indicating whether dependent quantization is used for quantizing the one or more slices of the current picture. When the second dependent quantization flag indicates that dependent quantization is not used for one or more slices of the current picture and the first sign hiding flag indicates that sign hiding is enabled for the current sequence, the decoder parses a second sign hiding flag for indicating whether sign hiding is used for quantizing the one or more slices of the current picture.

公开(公告)号：US11228787B2

公开(公告)日：2022-01-18

申请号：US17105573

申请日：2020-11-26

Applicant: MediaTek Inc.

Inventor： Man-Shu Chiang ,  Chih-Wei Hsu ,  Tzu-Der Chuang ,  Ching-Yeh Chen

IPC: H04N19/176 ,  H04N19/625

Abstract: A method for multiple transform selection (MTS) is provided. A video decoder receives data from a bitstream for a block of pixels to be decoded as a current block of a current picture of a video. The decoder sets a zero-out indication based on one or more non-zero coefficient indications of subblocks of the current block. When the zero-out indication indicates that a zero-out region has no non-zero coefficient, the decoder parses the bitstream for an MTS index. When the zero-out indication indicates that the zero-out region has at least one non-zero coefficient, the decoder sets the MTS index to a default value without parsing the MTS index from the bitstream. The decoder selects a transform mode according to the MTS index for the current block. The decoder reconstructs the current block by using the selected transform mode.

公开(公告)号：US20210360280A1

公开(公告)日：2021-11-18

申请号：US17386407

申请日：2021-07-27

Applicant: MEDIATEK INC.

Inventor： Zhi-Yi Lin ,  Tzu-Der Chuang ,  Chun-Chia Chen ,  Ching-Yeh Chen ,  Chih-Wei Hsu ,  Yu-Wen Huang

IPC: H04N19/52 ,  H04N19/105 ,  H04N19/137 ,  H04N19/159 ,  H04N19/176 ,  H04N19/186 ,  H04N19/583

Abstract: Exemplary video processing methods and apparatuses for coding a current block. One implementation operates by receiving input video data associated with a current block in a current picture; determining one or more Motion Vectors (MVs) for generating an OBMC region; generating one or more converted MVs by changing said one or more MVs to one or more integer MVs or changing a MV component of said one or more MVs to an integer component; deriving the OBMC region by motion compensation using said one or more converted MVs; applying OBMC by blending an OBMC predictor in the OBMC region with an original predictor; and encoding or decoding the current block.