公开(公告)号：US11178414B2

公开(公告)日：2021-11-16

申请号：US16802455

申请日：2020-02-26

Applicant: MediaTek Inc.

Inventor： Man-Shu Chiang ,  Chun-Chia Chen ,  Chih-Wei Hsu ,  Chia-Ming Tsai

IPC: H04N7/12 ,  H04N19/44 ,  H04N19/176 ,  H04N19/159 ,  H04N19/107 ,  H04N19/46 ,  H04N19/189

Abstract: A video codec receives data to be encoded or decoded as a current block of a current picture of a video. first and/or second flags indicate whether to apply a first combined prediction mode or a second combined prediction mode. The video codec decodes or encodes the current block. When the combined inter and intra prediction mode is applied, the current block is coded by using a combined prediction that is generated based on an inter-prediction and an intra-prediction. When the triangle prediction mode is applied, the current block is coded by using a combined prediction that is generated based on at least two inter-predictions.

公开(公告)号：US11166037B2

公开(公告)日：2021-11-02

申请号：US16802448

申请日：2020-02-26

Applicant: MediaTek Inc.

Inventor： Man-Shu Chiang ,  Chun-Chia Chen ,  Chih-Wei Hsu ,  Chia-Ming Tsai

IPC: H04N7/12 ,  H04N19/44 ,  H04N19/176 ,  H04N19/159 ,  H04N19/107 ,  H04N19/46 ,  H04N19/189

Abstract: A video decoder that implements a mutually exclusive grouping of coding modes is provided. The video decoder receives data for a block of pixels to be decoded as a current block of a current picture of a video. When a first coding mode for the current block is enabled, a second coding mode is disabled for the current block, wherein the first and second coding modes specify different methods for computing an inter-prediction for the current block. The current block is decoded by using an inter-prediction that is computed according to an enabled coding mode.

公开(公告)号：US11122260B2

公开(公告)日：2021-09-14

申请号：US16794309

申请日：2020-02-19

Applicant: MEDIATEK INC.

Inventor： Yu-Cheng Lin ,  Chun-Chia Chen ,  Chih-Wei Hsu

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

Abstract: A method and apparatus of Inter prediction for video coding including IBC (Intra Block Copy) are disclosed. In one method, an IBC Merge candidate list is generated from Merge candidates associated with one or more candidate types, wherein one or more target candidates associated with a target candidate type are excluded from the IBC Merge candidate list when one or more constraints are satisfied. Current motion information associated with the current block is encoded or decoded using the IBC Merge candidate list. According to another method, a pruning process for the IBC Merge candidate list is skipped or simplified according to block width, block height, or block area of the current block.

公开(公告)号：US11115653B2

公开(公告)日：2021-09-07

申请号：US16795491

申请日：2020-02-19

Applicant: MediaTek Inc.

Inventor： Yu-Cheng Lin ,  Chun-Chia Chen ,  Chih-Wei Hsu

IPC: H04N19/00 ,  H04N19/105 ,  H04N19/176 ,  H04N19/159 ,  H04N19/137 ,  H04N19/52

Abstract: A method for generating a list of merge candidates for Intra Block Copy (IBC) prediction is provided. A video codec receives data to be encoded or decoded as a current block of a current picture of a video. A plurality of spatially adjacent neighboring blocks of the current block are coded before the current block. The video codec generates a list of merge candidates including intra picture candidates that are associated with motion information referencing pixels in the current picture. The intra picture candidates comprises candidates that are associated with some but not all of the two or more spatially adjacent neighboring blocks of the current block. The video codec selects a merge candidate from the generated list. The video codec encodes or decodes the current block by using the motion information of the selected merge candidate to generate a prediction of the current block.

公开(公告)号：US11109064B2

公开(公告)日：2021-08-31

申请号：US16880344

申请日：2020-05-21

Applicant: MediaTek Inc.

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

IPC: H04N19/00 ,  H04N19/577 ,  H04N19/513 ,  H04N19/176

Abstract: A video decoder receives data for a block of pixels to be decoded as a current block of a current picture of a video. When the current block is coded by using inter mode and bi-directional prediction, the video decoder receives a first motion vector difference and determines a second motion vector difference based on a first flag or a second flag. When the first flag is false, the video decoder uses the second flag to determine whether to set the second motion vector difference to be at an opposite value of the first motion vector difference. When the first flag is true, the video decoder sets the second motion vector difference to be zero. The video decoder reconstructs the current block by using motion information based on the first motion vector difference and the second motion vector difference to perform inter prediction.

公开(公告)号：US11109057B2

公开(公告)日：2021-08-31

申请号：US17047443

申请日：2019-04-15

Applicant: MEDIATEK INC.

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

IPC: H04N7/18 ,  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 by overlapped sub-block motion compensation split the current block into overlapped sub-blocks, determine a sub-block MV for each overlapped sub-block, derive an initial predictor for each sub-block by motion compensation using the sub-block MV, derive a final predictor for each overlapped region by blending the initial predictors of the overlapped region, and encode or decode the current block based on the final predictors. Exemplary video processing methods and apparatuses for coding blocks with OBMC generate a converted MV by changing a MV to an integer MV or changing a MV component to an integer component, derive an OBMC region by motion compensation using the converted MVs, and encode or decode the blocks by blending an OBMC predictor with an original predictor.

公开(公告)号：US20210160528A1

公开(公告)日：2021-05-27

申请号：US17105569

申请日：2020-11-26

Applicant: MediaTek Inc.

Inventor： Chun-Chia Chen ,  Yu-Ling Hsiao ,  Chih-Wei Hsu ,  Tzu-Der Chuang ,  Ching-Yeh Chen

IPC: H04N19/513 ,  H04N19/176 ,  H04N19/184 ,  H04N19/70

Abstract: A video decoder determines whether the current block is coded by using intra block copy mode. The video decoder identifies a list of one or more prediction candidates for the current block. When the current block is not coded by using intra block copy mode, one or more spatial neighbors of the current block that are positioned in a same MER as the current block are excluded from the list of prediction candidates. When the current block is coded by using intra block copy mode and the list of prediction candidates belongs to a predefined subset of multiple different candidate lists, at least one of the identified prediction candidates is a spatial neighbor of the current block that is positioned in the MER. The video decoder reconstructs the current block by using a prediction candidate selected from the list of prediction candidates to generate a prediction of the current block.

公开(公告)号：US20210076035A1

公开(公告)日：2021-03-11

申请号：US17016257

申请日：2020-09-09

Applicant: MediaTek Inc.

Inventor： Chih-Wei Hsu ,  Lulin Chen ,  Yu-Wen Huang

IPC: H04N19/119 ,  H04N19/70 ,  H04N19/169 ,  H04N19/176

Abstract: A method for signaling subpicture structures for coded video is provided. A video decoder receives data from a bitstream to be decoded as a sequence of video pictures. The video decoder receives from the bitstream subpicture specification for one or more subpictures in the sequence of video pictures. The subpicture specification identifies a position and a size for each subpicture by providing an index that identifies a coding tree unit (CTU) for the subpicture. The video decoder reconstructs each subpicture for the sequence of video pictures according to the subpicture specification.

公开(公告)号：US20210006795A1

公开(公告)日：2021-01-07

申请号：US16921717

申请日：2020-07-06

Applicant: MediaTek Inc.

Inventor： Chen-Yen Lai ,  Olena Chubach ,  Tzu-Der Chuang ,  Ching-Yeh Chen ,  Chih-Wei Hsu ,  Yu-Wen Huang

IPC: H04N19/126 ,  H04N19/172 ,  H04N19/192

Abstract: A method for signaling scaling matrices for transform coefficient quantization is provided. A video decoder receives data from a bitstream to be decoded as a current picture of a video. The video decoder determines a plurality of scaling matrices that are used to code the current picture, wherein a first scaling matrix of the plurality of scaling matrices is determined by referencing a previously determined second scaling matrix of the plurality of scaling matrices. The video decoder dequantizes transform coefficients of transform blocks of the current picture by using the determined plurality of scaling matrices. The video decoder reconstructs the current picture by using the dequantized transform coefficients.

公开(公告)号：US10750203B2

公开(公告)日：2020-08-18

申请号：US15848154

申请日：2017-12-20

Applicant: MEDIATEK INC.

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

IPC: H04N19/577 ,  H04N19/109 ,  H04N19/176 ,  H04N19/513 ,  H04N19/523 ,  H04N19/537 ,  H04N19/44 ,  H04N19/52

Abstract: Method and apparatus of video coding using generalized bi-prediction are disclosed. According to one method, the generalized bi-prediction is extended for Decoder-Side Motion Vector Refinement (DMVR), where unequal weighting factor pair is allowed to form the template of the current block or the final predictor. In another method, the generalized bi-prediction is extended to pattern-based MV derivation (PMVD), where unequal weighting factor pair is allowed to combined reference blocks pointed by motion vectors derived based on PMVD. In yet another method, the generalized bi-prediction is used for Merge mode. When the final Merge MVP selected corresponds to bi-prediction using an unequal weighting factor pair, a new weighting factor pair is derived using neighboring reconstructed pixels of the current block and corresponding motion compensated pixels. In yet another method, the size of a set of weighting factor pairs is dependent on block size.