公开(公告)号：US11438611B2

公开(公告)日：2022-09-06

申请号：US17117724

申请日：2020-12-10

Applicant: MEDIATEK INC.

Inventor： Tzu-Der Chuang ,  Chih-Wei Hsu ,  Ching-Yeh Chen ,  Chia-Ming Tsai ,  Chun-Chia Chen ,  Olena Chubach ,  Yu-Wen Huang

IPC: H04N19/33 ,  H04N19/132 ,  H04N19/172 ,  H04N19/184

Abstract: Method and apparatus of coding a video sequence, are disclosed. According to the method, a bitstream corresponding to encoded data of the video sequence is generated at an encoder side or received at a decoder side, where the bitstream complies with a bitstream conformance that one or more constraints are satisfied. The constraints are related to a set of RPR (Reference Picture Resampling) parameters including scaling window width or height of a current picture, scaling window width or height of a reference picture, current picture width or height, and maximum picture width or height specified for the video sequence. Scaling information for the RPR mode is derived using the set of RPR parameters. A target picture of the video sequence is then encoded at the encoder side or decoded at the decoder side by utilizing the scaling information when the RPR mode is enabled for the target picture.

公开(公告)号：US11381834B2

公开(公告)日：2022-07-05

申请号：US17041655

申请日：2019-04-02

Applicant: MEDIATEK INC.

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

IPC: H04N19/513 ,  H04N19/105 ,  H04N19/119 ,  H04N19/159 ,  H04N19/176 ,  H04N19/533

Abstract: Video processing methods and apparatuses for coding a current block comprise receiving input data of a current block, partitioning the current block into multiple sub-blocks, deriving sub-block MVs for the current block according to a sub-block motion compensation coding tool, constraining the sub-block MVs to form constrained sub-block MVs, and encoding or decoding the current block using the constrained sub-block MVs. The sub-block MVs may be constrained according to a size, width, or height of the current block or a sub-block, an inter prediction direction of one of control point MVs of the current block, the current block, or current sub-block, the control point MVs, or a combination of the above.

公开(公告)号：US11310526B2

公开(公告)日：2022-04-19

申请号：US16248452

申请日：2019-01-15

Applicant: MEDIATEK INC.

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

IPC: H04N19/513 ,  H04N19/105 ,  H04N19/139 ,  H04N19/176 ,  H04N19/573 ,  H04N19/147 ,  H04N19/567

Abstract: A video codec that encodes or decodes video sequences using decoder-side motion vector refinement is provided. The video codec identifies a first motion vector and a second motion vector for coding a current block of pixels of a current video frame in the video sequence. The video codec determines whether to perform motion vector refinement for the current block of pixels based on a comparison between a linear dimension of the current block of pixels and a threshold. When motion vector refinement is performed, the video codec refines the first and second motion vectors to minimize a distortion cost and codes the current block of pixels by using the refined first and second motion vectors. When motion vector refinement is not performed, the video codec codes the current block of pixels by using the identified first and second motion vectors.

公开(公告)号：US11284077B2

公开(公告)日：2022-03-22

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 ,  H04N19/176 ,  H04N19/169 ,  H04N19/70

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：US11272182B2

公开(公告)日：2022-03-08

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.

公开(公告)号：US11245922B2

公开(公告)日：2022-02-08

申请号：US16541627

申请日：2019-08-15

Applicant: MediaTek Inc.

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

IPC: H04N19/56 ,  H04N19/53 ,  H04N19/96 ,  H04N19/583

Abstract: A video coder that uses a shared candidate list to encode or decode multiple blocks of pixels within a shared boundary is provided. The video coder identifies a shared boundary encompassing a plurality of blocks of pixels of a current picture in a video sequence. The video coder identifies one or more prediction candidates as a shared candidate list based on neighbors of a region defined by the shared boundary. The video coder codes one or more blocks of pixels encompassed by the shared boundary by using one or more prediction candidates selected from the shared candidate list.

公开(公告)号：US20210360255A1

公开(公告)日：2021-11-18

申请号：US17387618

申请日：2021-07-28

Applicant: MediaTek Inc.

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

IPC: H04N19/137 ,  H04N19/176 ,  H04N19/30 ,  H04N19/105

Abstract: A video coder receives data from a bitstream for a block of pixels to be encoded or decoded as a current block of a current picture of a video. Upon determining that an applied block setting of the current block satisfies a threshold condition, the video coder generates a first prediction based on a first motion information for a first prediction unit of the current block. The video coder generates a second prediction based on a second motion information for a second prediction unit of the current block. The video coder generates a third prediction based on the first and second motion information for an overlap prediction region that is defined based on a partitioning between the first prediction unit and the second prediction unit. The video coder encodes or decodes the current block by using the first, second, and third predictions.

公开(公告)号：US11146815B2

公开(公告)日：2021-10-12

申请号：US16924478

申请日：2020-07-09

Applicant: MEDIATEK INC.

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

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

Abstract: A method of video coding using generalized bi-prediction (GBi) receives input data associated with a current block in a current picture, wherein the input data comprises information associated with a block size of the current block, determines a set of weighting factor pairs, wherein a size of the set of weighting factor pairs depends on the block size of the current block, and derives a set of advanced motion vector prediction (AMVP) candidate lists comprising MVP (motion vector prediction) candidates. The method further derives a set of final motion information based on the MVP candidates, determines that the set of final information comprises a bi-prediction predictor, generates a final predictor by combining two reference blocks associated with the final motion information using a target weighting factor pair selected from the set of weighting factor pairs, and encodes or decoding the current block using the final predictor.

公开(公告)号：US11122272B2

公开(公告)日：2021-09-14

申请号：US16726924

申请日：2019-12-25

Applicant: MediaTek Inc.

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

IPC: H04B1/66 ,  H04N7/12 ,  H04N11/02 ,  H04N11/04 ,  H04N19/137 ,  H04N19/176 ,  H04N19/30 ,  H04N19/105

Abstract: A video coder receives data from a bitstream for a block of pixels to be encoded or decoded as a current block of a current picture of a video. Upon determining that an applied block setting of the current block satisfies a threshold condition, the video coder generates a first prediction based on a first motion information for a first prediction unit of the current block. The video coder generates a second prediction based on a second motion information for a second prediction unit of the current block. The video coder generates a third prediction based on the first and second motion information for an overlap prediction region that is defined based on a partitioning between the first prediction unit and the second prediction unit. The video coder encodes or decodes the current block by using the first, second, and third predictions.

公开(公告)号：US11070815B2

公开(公告)日：2021-07-20

申请号：US16619244

申请日：2018-06-07

Applicant: MEDIATEK INC.

Inventor： Chen-Yen Lai ,  Ching-Yeh Chen ,  Chih-Wei Hsu ,  Yu-Wen Huang

IPC: H04N19/159 ,  H04N19/126 ,  H04N19/176 ,  H04N19/55 ,  H04N19/593 ,  H04N19/503 ,  H04N19/182 ,  H04N19/573

Abstract: Method and apparatus of video coding are disclosed. According to the method, a boundary region in the current block is determined. For each pixel in the boundary region, an Intra predictor and an Inter predictor care derived. An Intra-Inter predictor is generated by blending the Intra predictor and the Inter predictor. Pixels in the boundary region of the current block are encoded or decoded using the Intra-Inter predictor. For the remaining pixels in the current block not belonging to the boundary region, the pixels are encoded or decoded using the Inter predictor or the Intra predictor. In another method, the Intra-Inter prediction process is implemented by scaling the sum of the Intra weighting factor and the Inter weighting factor is scaled to a power-of-2 number to avoid the need for the division operation. In yet another method, the Intra-Inter prediction is applied depending on the current block size.