Patents by Inventor Tzu-Der Chuang

Tzu-Der Chuang has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20210329233
    Abstract: Video processing methods and apparatuses in a video encoding or decoding system for processing a video picture partitioned into blocks with one or more partition constraints. The video encoding or decoding system receives input data of a current block and checks whether a predefined splitting type is allowed to partition the current block according to first and second constraints. The first constraint restricts each sub-block partitioned from the current block to be completely contained in one pipeline unit, and the second constraint restricts each sub-block partitioned from the current block to contain one or more complete pipeline units. The pipeline units are non-overlapping units in the video picture designed for pipeline processing. The current block is not partitioned by the predefined splitting type if any sub-block partitioned by the predefined splitting type violates both the first and second constraints. The system encodes or decodes the current block.
    Type: Application
    Filed: July 12, 2019
    Publication date: October 21, 2021
    Inventors: Chia-Ming TSAI, Chih-Wei HSU, Ching-Yeh CHEN, Tzu-Der CHUANG, Yu-Wen HUANG
  • Publication number: 20210329230
    Abstract: An intra prediction method comprises receiving input data of a current block in a current picture, deriving multiple Most Probable Modes (MPMs) to be included in a MPM list for the current block, setting remaining intra prediction modes as non-MPMs, and encoding or decoding the current block according to a current intra prediction mode selecting from the MPMs and non-MPMs. The first MPM in the MPM list is Planar mode for blocks coded or to be coded in intra prediction, and one or more other MPMs in the MPM list are derived according to a number of available angular mode of one or more neighboring blocks of the current block.
    Type: Application
    Filed: August 27, 2019
    Publication date: October 21, 2021
    Inventors: Man-Shu CHIANG, Chih-Wei HSU, Tzu-Der CHUANG, Ching-Yeh CHEN, Mohammed Golam SARWER
  • Publication number: 20210329287
    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.
    Type: Application
    Filed: July 18, 2019
    Publication date: October 21, 2021
    Inventors: Man-Shu CHIANG, Chih-Wei HSU, Tzu-Der CHUANG, Ching-Yeh CHEN, Yu-Wen HUANG
  • Patent number: 11153607
    Abstract: A deblocking filtering method includes receiving reconstructed video data associated with a block boundary in a video coding system. The block boundary has N lines of samples crossing the block boundary from a P side to a Q side of the boundary. The method further includes determining whether to apply a first filter set to reduce block artifacts at the block boundary based on whether a first inter-side difference of a first line of the N lines of samples is greater than an inter-side difference threshold, determining a filter length of a filter in the first filter set based on a first side length of the P side, and a second side length of the Q side when it is determined to apply the first filter set, and applying at least one filter in the first filter set with the determined filter length on the block boundary.
    Type: Grant
    Filed: December 11, 2018
    Date of Patent: October 19, 2021
    Assignee: MEDIATEK INC.
    Inventors: Chia-Ming Tsai, Tzu-Der Chuang, Chih-Wei Hsu, Ching-Yeh Chen, Yu-Wen Huang
  • Patent number: 11153599
    Abstract: Method and apparatus of using Bi-directional optical flow (BIO) for a true bi-direction predicted block are disclosed. According to one method of the present invention, the gradients are limited to a predefined bit-depth in order to reduce the computational complexity. According to another method, the data range of gradient sum and/or the difference between L0 and L1 interpolated pixels are shifted by a predefined bit-depth. The pre-defined bit-depth can be implicitly determined or signalled in a bit stream at a sequence level, picture level or slice level. The pre-defined bit-depth can also be determined dependent on input bit-depth.
    Type: Grant
    Filed: June 10, 2019
    Date of Patent: October 19, 2021
    Assignee: MEDIATEK INC.
    Inventors: Yu-Chi Su, Ching-Yeh Chen, Tzu-Der Chuang, Chen-Yen Lai
  • Publication number: 20210321106
    Abstract: A method and apparatus for video coding are disclosed. According to the present invention, a flag is determined, where the flag indicates whether a scaling matrix is enabled or not enabled for non-separable secondary transform (NSST) coded blocks. When the current block is one NSST coded block and the flag indicates that the scaling matrix is enabled for the NSST blocks, the scaling matrix is determined and applied to the current block. When the current block is one NSST coded block and the flag indicates that the scaling matrix is not enabled for the NSST coded blocks, the scaling matrix is skipped for the current block. According to another method, for a rectangular block, a target scaling matrix is generated directly from a square base scaling matrix in one step without up-sampling-and-down-sampling or down-sampling-and-up-sampling.
    Type: Application
    Filed: June 17, 2021
    Publication date: October 14, 2021
    Applicant: MEDIATEK INC.
    Inventors: Chen-Yen LAI, Olena CHUBACH, Tzu-Der CHUANG, Ching-Yeh CHEN
  • Publication number: 20210321089
    Abstract: A method and apparatus of video coding using history-based candidate derivation are disclosed. According to one method, a current block is inside a Shared Merge candidate list Region (SMR) or a history-based parallel processing region is received. The current block is encoded or decoded using a Merge candidate list. Only if the current block is one of first-coded N (N?0) blocks, one of last-coded N blocks, or one of selected N blocks, the history-based candidate list is updated after the current block is encoded or decoded. In one embodiment, Merge candidate list is pre-generated for the current block in the SMR and is separately generated for the current block in the history-based parallel processing region. In another method, if the current block is inside the SMR or the history-based parallel processing region, the current block is encoded or decoded using a history-based candidate list associated with the root CU.
    Type: Application
    Filed: October 5, 2019
    Publication date: October 14, 2021
    Inventors: Yu-Cheng LIN, Chen-Yen LAI, Chun-Chia CHEN, Yu-Ling HSIAO, Tzu-Der CHUANG, Ching-Yeh CHEN, Chih-Wei HSU
  • Publication number: 20210321098
    Abstract: Video data processing methods and apparatuses receive input data associated with a current split node partitioned from a parent node by a splitting type, determine a depth of the current split node according to the splitting type, and compare the depth of the current split node with a maximum delta QP signaling depth. A video decoding system derives a delta QP from one or more syntax elements signaled in a TU associated with the current split node according to the comparing result, reconstructs a final QP for the current split node based on a reference QP and the delta QP, and decodes one or more TUs associated with the current split node using the final QP. The depth is counted in a way considering different splitting types and splitting partitions.
    Type: Application
    Filed: August 16, 2019
    Publication date: October 14, 2021
    Inventors: Tzu-Der CHUANG, Chih-Wei HSU, Ching-Yeh CHEN
  • Patent number: 11146824
    Abstract: Video processing methods and apparatuses for processing video pictures referring to a high-level syntax set include receiving input data, determining a first syntax element indicating whether reference picture resampling is disabled or constrained, determining a second syntax element indicating whether subpicture partitioning is disabled or constrained, and encoding or decoding the video pictures. The first and second syntax elements are restricted to disable or constrain subpicture partitioning when reference picture resampling is enabled or disable or constrain reference picture resampling when subpicture partitioning is enabled. The first syntax element and the second syntax element are syntax elements signaled in the high level syntax set.
    Type: Grant
    Filed: December 28, 2020
    Date of Patent: October 12, 2021
    Assignee: MEDIATEK INC.
    Inventors: Shih-Ta Hsiang, Ching-Yeh Chen, Tzu-Der Chuang, Lulin Chen
  • Patent number: 11146815
    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.
    Type: Grant
    Filed: July 9, 2020
    Date of Patent: October 12, 2021
    Assignee: MEDIATEK INC.
    Inventors: Ching-Yeh Chen, Tzu-Der Chuang, Chih-Wei Hsu, Yu-Wen Huang
  • Publication number: 20210314559
    Abstract: A video processing method comprises receiving input data of a current block, checking if the current block satisfies one or more predefined criteria, setting the current block to be a root block if the current block satisfies the predefined criteria, one or more color components of one or more blocks in the current block are not checked with the predefined criteria if the current block is a root block, encoding or decoding the one or more color components of one or more blocks in the current block using neighboring reconstructed samples of the one or more color components of the current block as reference samples if the current block is a root block. Each block in the current block is encoded or decoded using neighboring reconstructed samples of each block in the current block as reference samples if the current block is not a root block.
    Type: Application
    Filed: October 9, 2019
    Publication date: October 7, 2021
    Inventors: Zhi-Yi LIN, Tzu-Der CHUANG, Ching-Yeh CHEN
  • Publication number: 20210314560
    Abstract: Video processing methods comprise receiving input data of a current block in a current picture, constructing a candidate list for the current block by including one or more History-based Motion Vector Predictor (HMVP) candidates, selecting one candidate from the candidate list, locating a reference block according to motion information of the selected candidate, and encoding or decoding the current block by predicting the current block using the reference block. The one or more HMVP candidates are fetched from a normal HMVP table if the current block is to be processed by a normal inter prediction mode, and the one or more HMVP candidates are fetched form a Current Picture Referencing (CPR) HMVP table if the current block is to be processed by a CPR mode. The two HMVP tables are separately maintained and updated.
    Type: Application
    Filed: November 6, 2019
    Publication date: October 7, 2021
    Inventors: Chen-Yen LAI, Yu-Ling HSIAO, Tzu-Der CHUANG, Ching-Yeh CHEN
  • Patent number: 11140398
    Abstract: The techniques described herein relate to methods, apparatus, and computer readable media configured to encode or decode video data. A current block of video data is coded using affine prediction. A first set of candidates of a candidate list for the current block is generated, including determining one or more inherited candidates and deriving one or more constructed candidates. After generating the first set of candidates, it is determined whether the candidate list is full. Upon determining the candidate list is not full, the candidate list is filled by generating a second set of candidates of the candidate list, including one or more of generating one or more zero motion vector candidates, generating one or more additional derived candidates based on the plurality of associated neighboring blocks of the current block, and generating a temporal motion vector candidate based on a temporal collocated picture.
    Type: Grant
    Filed: August 8, 2019
    Date of Patent: October 5, 2021
    Assignee: MediaTek Inc.
    Inventors: Zhi-Yi Lin, Tzu-Der Chuang, Ching-Yeh Chen
  • Publication number: 20210306659
    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.
    Type: Application
    Filed: July 31, 2019
    Publication date: September 30, 2021
    Inventors: Chen-Yen LAI, Ching-Yeh CHEN, Tzu-Der CHUANG
  • Publication number: 20210297691
    Abstract: Methods and apparatus of Inter prediction using coding modes including an affine mode are disclosed. According to one method, if the target neighbouring block is in a neighbouring region of the current block, an affine control-point MV candidate is derived based on two target MVs (motion vectors) of the target neighbouring block where the affine control-point MV candidate is based on a 4-parameter affine model and the target neighbouring block is coded in a 6-parameter affine mode. According to another method, if the target neighbouring block is in a neighbouring region of the current block, an affine control-point MV candidate is derived based on two sub-block MVs (motion vectors) of the target neighbouring block, if the target neighbouring block is in a same region as the current block, the affine control-point MV candidate is derived based on control-point MVs of the target neighbouring block.
    Type: Application
    Filed: June 20, 2019
    Publication date: September 23, 2021
    Inventors: Tzu-Der CHUANG, Ching-Yeh CHEN, Zhi-Yi LIN
  • Patent number: 11128868
    Abstract: Method and apparatus of video coding are disclosed. According to one method, the left reference boundary samples and the top reference boundary samples are checked jointly. According to another method, selected original left reference boundary samples and selected original top reference boundary samples at specific positions are used for predictor up-sampling. According to yet another method, the horizontal interpolation and the vertical interpolation are in a fixed order regardless of a shape of the current block, size of the current block or both.
    Type: Grant
    Filed: June 8, 2020
    Date of Patent: September 21, 2021
    Assignee: MEDIATEK INC.
    Inventors: Zhi-Yi Lin, Tzu-Der Chuang, Ching-Yeh Chen, Chih-Wei Hsu
  • Publication number: 20210281873
    Abstract: Video processing methods and apparatuses for candidate set determination for binary-tree splitting blocks comprise receiving input data of a current block partitioned from a parent block by binary-tree splitting, determining a candidate set for the current block by prohibiting a spatial candidate derived from a neighboring block partitioned from the same parent block or determining the candidate set for the current block by conducting a pruning process if the neighboring block is coded in Inter prediction, and encoding or decoding the current block based on the candidate set by selecting one final candidate from the candidate set. The pruning process comprises scanning the candidate set to determine if any candidate equals to the spatial candidate derived from the neighboring block, and removing the candidate equals to the spatial candidate from the candidate set.
    Type: Application
    Filed: September 5, 2017
    Publication date: September 9, 2021
    Inventors: Chun-Chia CHEN, Chih-Wei HSU, Tzu-Der CHUANG, Ching-Yeh CHEN, Yu-Wen HUANG
  • Patent number: 11115660
    Abstract: A methods and apparatus for block partition in video encoding and decoding are disclosed. According to one method, a current data unit is partitioned into initial blocks using inferred splitting without split-syntax signalling. The initial blocks comprises multiple initial luma blocks and multiple initial chroma blocks, and size of the initial luma block is M×N, M and N are positive integers and the current data unit is larger than M×N for the luma component. A partition structure is determined for partitioning each initial luma block and each initial chroma block into one or more luma CUs (coding units) and one or more chroma CUs respectively. The luma syntaxes and the chroma syntaxes associated with one initial block in the current data unit are signalled or parsed, and then the luma syntaxes and the chroma syntaxes associated with one next initial block in the current data unit are signalled or parsed.
    Type: Grant
    Filed: April 30, 2019
    Date of Patent: September 7, 2021
    Assignee: MEDIATEK INC.
    Inventors: Tzu-Der Chuang, Ching-Yeh Chen, Kung-Nien Yang, Chun-Chia Chen
  • Publication number: 20210274218
    Abstract: A method and apparatus use an Inter coding tool and OBMC (Overlapped Block Motion Compensation). According to one implementation, a method of video coding using OBMC (Overlapped Block Motion Compensation) operates by receiving input data associated with a current block, wherein the input data correspond to pixel data to be coded at an encoder side or coded data to be decoded at a decoder side, applying the OBMC to the current block depending on one or more constraints, and signaling an OBMC syntax conditionally at the encoder side or parsing the OBMC syntax conditionally at the decoder side for the current block, wherein the OBMC syntax indicates whether the OBMC is applied to the current block.
    Type: Application
    Filed: May 21, 2021
    Publication date: September 2, 2021
    Inventors: Zhi-Yi LIN, Tzu-Der CHUANG, Ching-Yeh CHEN, Chun-Chia CHEN, Chih-Wei HSU
  • Patent number: 11109064
    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.
    Type: Grant
    Filed: May 21, 2020
    Date of Patent: August 31, 2021
    Assignee: MediaTek Inc.
    Inventors: Man-Shu Chiang, Chih-Wei Hsu, Tzu-Der Chuang