公开(公告)号：US20230164358A1

公开(公告)日：2023-05-25

申请号：US17892933

申请日：2022-08-22

Applicant: MediaTek Inc.

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

IPC: H04N19/615 ,  H04N19/177 ,  H04N19/182 ,  H04N19/109 ,  H04N19/137 ,  H04N19/176 ,  H04N19/119 ,  H04N19/117 ,  H04N19/105 ,  H04N19/167 ,  H04N19/172

CPC classification number: H04N19/615 ,  H04N19/177 ,  H04N19/182 ,  H04N19/109 ,  H04N19/137 ,  H04N19/176 ,  H04N19/119 ,  H04N19/117 ,  H04N19/105 ,  H04N19/167 ,  H04N19/172

Abstract: Various schemes pertaining to pre-encoding processing of a video stream with motion compensated temporal filtering (MCTF) are described. An apparatus determines a filtering interval for a received raw video stream having pictures in a temporal sequence. The apparatus selects from the pictures a plurality of target pictures based on the filtering interval, as well as a group of reference pictures for each target picture to perform pixel-based MCTF, which generates a corresponding filtered picture for each target picture. The apparatus subsequently transmits the filtered pictures as well as non-target pictures to an encoder for encoding the video stream. Subpictures of natural images and screen content images are separately processed by the apparatus.

公开(公告)号：US11546587B2

公开(公告)日：2023-01-03

申请号：US16845070

申请日：2020-04-10

Applicant: MediaTek Inc.

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

IPC: H04N19/117 ,  H04N19/176 ,  H04N19/82

Abstract: A method for signaling adaptive loop filter (ALF) settings 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 video decoder parses whether to use adaptive parameter set (APS) for filtering the current block without determining whether to select a particular APS from a plurality of APSs. When the APS is used to filter the current block, the video decoder parses a first filter selection index for selecting a filter from a set of filters in the APS. When the APS is not used to filter the current block, the video decoder signals a second filter selection index for selecting a filter from a set of default fixed filters. The video decoder filters the current block based on the selected filter. The video decoder outputs the filtered current block.

公开(公告)号：US11539977B2

公开(公告)日：2022-12-27

申请号：US17263651

申请日：2019-07-31

Applicant: MEDIATEK INC.

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

IPC: H04N19/52 ,  H04N19/105 ,  H04N19/176 ,  H04N19/46

Abstract: A method and apparatus of Inter prediction for video coding using UMVE (Ultimate Motion Vector Expression) are disclosed. According to this method, a base candidate is selected from an original Inter candidate list, where the base candidate has a base prediction direction. One or more extended candidates are derived by adding one or more offsets to the base candidate, where said one or more extended candidates have a same prediction direction as the base prediction direction. The extended candidates are then inserted into the original Inter candidate list to form an extended Inter candidate list for encoding or decoding. According to another method, the UMVE mode is treated as an additional AMVP (Advanced Motion Vector Prediction) mode.

公开(公告)号：US11509938B2

公开(公告)日：2022-11-22

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: H04B1/66 ,  H04N7/12 ,  H04N11/02 ,  H04N11/04 ,  H04N19/70 ,  H04N19/172 ,  H04N19/184

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：US11425386B2

公开(公告)日：2022-08-23

申请号：US17316930

申请日：2021-05-11

Applicant: MEDIATEK INC.

Inventor： Tzu-Der Chuang ,  Ching-Yeh Chen

IPC: H04N19/13

Abstract: A method and apparatus of entropy coding of coding symbols using Context-Based Adaptive Binary Arithmetic Coder (CABAC) are disclosed. The method operates by applying context-adaptive arithmetic encoding or decoding to a current bin of a binary data of a current coding symbol according to a current binarized probability value of the current bin and a current range associated with a current state of the context-adaptive arithmetic encoding or decoding; deriving an LPS probability index corresponding to an inverted current binarized probability value or the current binarized probability value, depending on whether the current binarized probability value of the current bin is greater than or equal to 2k−1, k being a positive integer; deriving a range index for identifying one range interval containing the current range; and deriving an LPS range using one or more mathematical operations.

公开(公告)号：US11375182B2

公开(公告)日：2022-06-28

申请号：US17121927

申请日：2020-12-15

Applicant: MEDIATEK INC.

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

IPC: H04N19/105 ,  H04N19/159 ,  H04N19/573 ,  H04N19/187 ,  H04N19/186

Abstract: Method and apparatus of video coding using a multi-layer prediction mode, are disclosed. According to one method, a bitstream is generated at an encoder side or received at a decoder side, where the bitstream corresponds to coded data of current video data in a current layer. The bitstream complies with a bitstream conformance requirement corresponding both the bit depth values for the current layer and the reference layer being the same and the chroma format index values for the current layer and the reference layer being the same. The current video data in the current layer is then encoded or decoded by utilizing reference video data in the reference layer.

公开(公告)号：US11356657B2

公开(公告)日：2022-06-07

申请号：US16962900

申请日：2019-01-24

Applicant: MEDIATEK INC.

Inventor： Zhi-Yi Lin ,  Tzu-Der Chuang ,  Ching-Yeh Chen

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

Abstract: Methods and apparatus of Inter prediction for video coding including affine Inter mode are disclosed. In one method, an affine MVP candidate list is generated, wherein the affine MVP candidate list comprises at least one inherited affine MVP derived from a neighbouring block set. Prediction differences of a current control-point MV set associated with the affine motion model are encoded using one predictor selected from the affine MVP candidate list at the video encoder side or the prediction differences of the current control-point MV set associated with the affine motion model are decoded at the video decoder side using one predictor selected from the affine MVP candidate list. In another method, the inherited affine MVP is derived by considering whether at least one of reference picture lists of said at least one neighbouring block includes one reference picture being the same as a current reference picture of the current block.

公开(公告)号：US11223837B2

公开(公告)日：2022-01-11

申请号：US16545583

申请日：2019-08-20

Applicant: MediaTek Inc.

Inventor： Tzu-Der Chuang ,  Zhenzhong Chen ,  Shan Liu ,  Ching-Yeh Chen ,  Chih-Wei Hsu

IPC: H04N19/30 ,  H04N19/105 ,  H04N19/176 ,  H04N19/187 ,  H04N19/61 ,  H04N19/134 ,  H04N19/52 ,  H04N19/12 ,  H04N19/50

Abstract: Methods of adaptive transform type based on transform unit (TU) size for enhancement layer (EL) coding and multiple motion candidates for EL coding based on corresponding base layer (BL) video data are provided. One method selects a transform type from multiple allowable transform types based on the TU size and applies the selected transform type to the transform units of the inter-layer prediction processed data. Another method derives multiple motion candidates for the EL video data coded in Merge mode or Inter mode based on motion information associated with the corresponding BL video data.

公开(公告)号：US11218721B2

公开(公告)日：2022-01-04

申请号：US17260002

申请日：2019-07-18

Applicant: MEDIATEK INC.

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

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

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：US11206395B2

公开(公告)日：2021-12-21

申请号：US17029239

申请日：2020-09-23

Applicant: MediaTek Inc.

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

IPC: H04N19/105 ,  H04N19/30 ,  H04N19/46 ,  H04N19/176 ,  H04N19/159 ,  H04N19/186 ,  H04N19/70

Abstract: A method for signaling scaling matrices for transform coefficient quantization is provided. A decoder receives data from a bitstream to be decoded as a current picture of a video, the current picture to be decoded by using a plurality of scaling matrices. The decoder receives a reference index offset for a first scaling matrix of the plurality of scaling matrices. The decoder applies the reference index offset to a first index identifying the first scaling matrix to derive a second index identifying a second scaling matrix of the plurality of scaling matrices. The second scaling matrix is previously reconstructed. The decoder reconstructs the first scaling matrix by referencing the second scaling matrix. The decoder dequantizes transform coefficients of transform blocks of the current picture by using the plurality of scaling matrices and reconstructs the current picture by using the dequantized transform coefficients.