公开(公告)号：US11882270B2

公开(公告)日：2024-01-23

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 ,  H04N19/46 ,  H04N19/159

CPC classification number: H04N19/105 ,  H04N19/159 ,  H04N19/172 ,  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：US11582466B2

公开(公告)日：2023-02-14

申请号：US17180190

申请日：2021-02-19

Applicant: MediaTek Inc.

Inventor： Chen-Yen Lai ,  Ching-Yeh Chen ,  Tzu-Der Chuang ,  Olena Chubach

IPC: H04N19/169 ,  H04N19/503

Abstract: A video coding method using inter-layer prediction or referencing is provided. A video decoder receives data from a bitstream carrying data for video pictures in a plurality of different layers. At least one of the plurality of layers comprises temporal sublayers that correspond to levels in a hierarchical temporal prediction structure. Each temporal sublayer is associated with a temporal identifier. The video decoder receives an inter-layer prediction constraint parameter constraining a maximum temporal sublayer used in inter-layer prediction. The video decoder reconstructs a first picture in a first layer by referencing data of a second picture in a second layer. A temporal identifier of the referenced data satisfies the received inter-layer prediction constraint parameter.

公开(公告)号：US11582454B2

公开(公告)日：2023-02-14

申请号：US17441795

申请日：2020-03-23

Applicant: MEDIATEK INC.

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

IPC: H04N19/126 ,  H04N19/132 ,  H04N19/176 ,  H04N19/18 ,  H04N19/186 ,  H04N19/61 ,  H04N19/70

Abstract: A method and apparatus for video coding utilizing a current block, a maximum side of the transform block of the current block corresponds to 64. A scaling matrix is derived from elements of an 8×8 base scaling matrix, where the elements in a bottom-right 4×4 region of the 8×8 base scaling matrix are skipped, either not signaled or set to zero. According to another method, a current block belongs to a current picture in a first color format that has only a first color component. A first scaling matrix is signaled at the video encoder side or parsed at the video decoder side for the first color component of the current block. Signaling any second scaling matrix is disabled at the video encoder side or parsing any second scaling matrix is disabled at the video decoder side for a second or third color component of the current block.

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.