公开(公告)号：US12120293B2

公开(公告)日：2024-10-15

申请号：US17977466

申请日：2022-10-31

Applicant: MediaTek Inc.

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

IPC: H04N19/105 ,  H04N19/117 ,  H04N19/176 ,  H04N19/423 ,  H04N19/52

CPC classification number: H04N19/105 ,  H04N19/117 ,  H04N19/176 ,  H04N19/423 ,  H04N19/52

Abstract: A video coding system generating candidates for Merge Mode with Motion Vector Difference (MMVD) with reduced resource usage is provided. The system receives data to be encoded or decoded as a current block of a current picture of a video. The system identifies multiple MMVD candidates for different offset positions based on a merge candidate of the current block. The system generates reference samples for the identified MMVD candidates. The system reconstructs the current block or encodes the current block into a bitstream by using the generated reference samples. The system processes the MMVD candidates in separate groups: a first group of vertical MMVD candidates and a second group of horizontal MMVD candidates. The system generates the reference samples for the identified MMVD candidates by applying a vertical filter to source reference samples of horizontal MMVD candidates and then applying a horizontal filter to outputs of the vertical filter.

公开(公告)号：US11856227B2

公开(公告)日：2023-12-26

申请号：US17825269

申请日：2022-05-26

Applicant: MEDIATEK INC.

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

IPC: H04N19/625 ,  H04N19/124 ,  H04N19/122 ,  H04N19/18 ,  H04N19/176 ,  H04N19/423

CPC classification number: H04N19/625 ,  H04N19/122 ,  H04N19/124 ,  H04N19/176 ,  H04N19/18 ,  H04N19/423

Abstract: Video encoding methods and apparatuses in a video encoding system receive an input residual signal of a current block by a shared transform circuit, apply horizontal transform and vertical transform by a shared transform circuit to generate transform coefficients, apply quantization and inverse quantization to generate recovered transform coefficients, apply inverse vertical transform and inverse horizontal transform to the recovered transform coefficients by the shared transform circuit to generate a reconstructed residual signal for the current block, and encode the current block based on quantized levels of the current block. The shared transform circuit and a coefficient buffer in the folded 4-time transform architecture reuse computation resources in each transform stage. In some embodiments of the folded 4-time transform architecture, a hierarchical design for block size grouping is implemented with fixed throughput for uniform hardware scheduling.

公开(公告)号：US20230199171A1

公开(公告)日：2023-06-22

申请号：US17994400

申请日：2022-11-28

Applicant: MediaTek Inc.

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

IPC: H04N19/105 ,  H04N19/137 ,  H04N19/176 ,  H04N19/172

CPC classification number: H04N19/105 ,  H04N19/137 ,  H04N19/176 ,  H04N19/172

Abstract: Various schemes for managing search memory are described, which are beneficial in achieving enhanced coding gain, low latency, and/or reduced hardware for a video encoder or decoder. In processing a current block of a current picture, an apparatus determines a quantity of a plurality of reference pictures of the current picture. The apparatus subsequently determines, for at least one of the reference pictures, a corresponding search range size based on the quantity. The apparatus then determines, based on the search range size and a location of the current block, a search range of the reference picture, based on which the apparatus encodes or decodes the current block.

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：US11477474B2

公开(公告)日：2022-10-18

申请号：US16432890

申请日：2019-06-05

Applicant: MediaTek Inc.

Inventor： Man-Shu Chiang ,  Chih-Wei Hsu

IPC: H04N11/02 ,  H04N19/513 ,  H04N19/176

Abstract: The techniques described herein relate to methods, apparatus, and computer readable media configured to decode and/or encode video data. If the current coding block was using more than one hypotheses of prediction data to generate the prediction data, first prediction data is determined for a current coding block of a picture generated using a first prediction mode, and second prediction data is determined for the current coding block generated using a second prediction mode. Information derived from at least one of the first prediction mode and the second prediction mode can be stored. The stored information can be referenced by the subsequent coding blocks.

公开(公告)号：US11432004B2

公开(公告)日：2022-08-30

申请号：US16846514

申请日：2020-04-13

Applicant: MEDIATEK INC.

Inventor： Yu-Ling Hsiao ,  Chih-Wei Hsu

IPC: H04N19/583

Abstract: Method and apparatus for constrained mode signaling are disclosed. According to one method, a plurality of mode syntaxes are used to signal a current mode used for the current block. If one or more of the plurality of candidate modes are unavailable according to one or more conditions related to the current block, signaling a mode syntax is skipped at the video encoder side or parsing the mode syntax is skipped at the video decoder side. In one embodiment, a regular flag indicating on or off of a regular Merge mode or Skip mode is not signaled if Merge mode with MVD (MMVD) mode, Affine mode, subblock Temporal Motion Vector Prediction (SbTMVP) mode, Combined Inter and Intra Prediction (CIIP) Merge mode, and Triangle Prediction Mode (TPM) are disabled as indicated by an SPS flag.

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：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.