Patents by Inventor Ching Yeh Chen

Ching Yeh Chen 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).

  • Method and Apparatus of Cross-Component Adaptive Loop Filtering for Video Coding
    Publication number: 20220256145
    Abstract: Methods and apparatus for loop-filter processing of reconstructed video are disclosed. According to one method, multiple CC-ALF (Cross-Component Adaptive Loop Filter) filters are used. Selection of the multiple CC-ALF filters can be signalled in one APS (Adaptation Parameter Set). According to another method, the CC-ALF can be implemented according to the difference between a to-be-process sample and its neighbouring sample.
    Type: Application
    Filed: July 24, 2020
    Publication date: August 11, 2022
    Inventors: Yu-Wen HUANG, Chih-Wei HSU, Ching-Yeh CHEN, Tzu-Der CHUANG, Shaw-Min LEI
  • Methods and Apparatuses of Syntax Signaling and Referencing Constraint in Video Coding System
    Publication number: 20220256201
    Abstract: Encoding methods and apparatuses comprise determining parameters of a specific process for a current slice, signaling in one or more Adaptive Parameter Sets (APSs), performing the specific process using the parameters, signaling an APS ID of each signaled APS in a slice header, and encoding the current slice. Each APS is classified into a category according to a type of data carried by the APS. The APS ID of each signaled APS is counted in a category associated with the specific process and is independent of other categories. Decoding methods and apparatuses comprise parsing an APS ID of each referenced APS from a slice header of a current slice for a specific process, determining parameters from each referenced APS according to the parsed APS ID and a category associated with the specific process, performing the specific process on the current slice and decoding the current slice.
    Type: Application
    Filed: April 30, 2020
    Publication date: August 11, 2022
    Inventors: Ching-Yeh CHEN, Yu-Wen HUANG, Chih-Wei HSU, Tzu-Der CHUANG, Shih-Ta HSIANG
  • SIGNALING FOR ILLUMINATION COMPENSATION
    Publication number: 20220248064
    Abstract: A video coder that implements illumination compensation is provided. The video coder receives a first block of pixels in a first video picture to be coded as a current block, wherein the current block is associated with a motion vector that references a second block of pixels in a second video picture as a reference block. The video coder performs inter-prediction for the current block by using the motion vector to generate a set of motion-compensated pixels for the current block. The video coder modifies the set of motion-compensated pixels of the current block by applying a linear model that is computed based on neighboring samples of the reference block and of the current block. The neighboring samples are identified based on a position of the current block within a larger block.
    Type: Application
    Filed: April 19, 2022
    Publication date: August 4, 2022
    Inventors: Chia-Ming TSAI, Chun-Chia CHEN, Chih-Wei HSU, Ching-Yeh CHEN, Tzu-Der CHUANG
  • Specifying slice chunks of a slice within a tile
    Patent number: 11405649
    Abstract: A video system that partitions slices of video pictures into slice chunks is provided. A video decoder receives data from a bitstream to be decoded as a current picture of a video. When a first syntax element in a picture parameter set (PPS) of the current picture indicates that one or more slices of the current picture are allowed to be divided into multiple slice chunks and when a second syntax element in a slice header of a current slice of the current picture indicates that data of the current slice is encoded and delivered in two or more slice chunks, the video decoder parses and specifies sizes and positions of the slice chunks of the current slice and reconstructs the current picture based on the slice chunks of the current slice.
    Type: Grant
    Filed: February 17, 2021
    Date of Patent: August 2, 2022
    Assignee: MEDIATEK INC.
    Inventors: Chih-Wei Hsu, Lulin Chen, Chun-Chia Chen, Yu-Ling Hsiao, Yu-Wen Huang, Ching-Yeh Chen, Tzu-Der Chuang
  • Method and Apparatus of Subblock Deblocking in Video Coding
    Publication number: 20220239931
    Abstract: Method and apparatus for constrained de-blocking filter are disclosed. One method receives input data related to a current block in a current picture at a video encoder side or a video bitstream determines a block boundary of the current block and sub-block boundaries inside the current block, wherein the current block is partitioned into a plurality of sub-blocks using sub-block mode prediction. The method then applies de-blocking process to a reconstructed current block corresponding to the current block to result in a current filtered-reconstructed block, wherein said applying the de-blocking process to the current block comprises applying the de-blocking process to the sub-block boundaries inside the current filtered-reconstructed block, and generates a filtered decoded picture including the current filtered-reconstructed block.
    Type: Application
    Filed: April 11, 2022
    Publication date: July 28, 2022
    Inventors: Chia-Ming TSAI, Chih-Wei HSU, Ching-Yeh CHEN, Tzu-Der CHUANG, Yu-Wen HUANG
  • SIGNALING CODING OF TRANSFORM-SKIPPED BLOCKS
    Publication number: 20220239951
    Abstract: A method for performing transform skip mode (TSM) in a video decoder is provided. A video decoder receives data from a bitstream to be decoded as a plurality of video pictures. The video decoder parses the bitstream for a first syntax element in a sequence parameter set (SPS) of a current sequence of video pictures. When the first syntax element indicates that transform skip mode is allowed for the current sequence of video pictures and when transform skip mode is used for a current block in a current picture of the current sequence, the video decoder reconstructs the current block by using quantized residual signals that are not transformed.
    Type: Application
    Filed: April 11, 2022
    Publication date: July 28, 2022
    Applicant: HFI INNOVATION INC.
    Inventors: Shih-Ta HSIANG, Lulin CHEN, Tzu-Der CHUANG, Chih-Wei HSU, Ching-Yeh CHEN, Olena CHUBACH, Yu-Wen HUANG
  • INHERITED MOTION INFORMATION FOR DECODING A CURRENT CODING UNIT IN A VIDEO CODING SYSTEM
    Publication number: 20220232238
    Abstract: A method of video decoding at a decoder can include receiving a bitstream including encoded data of a picture, decoding a plurality of coding units (CUs) in the picture based on motion information stored in a history-based motion vector prediction (HMVP) table, resetting the HMVP table for every N CTU rows. The method also provides updating the HMVP table with the motion information of the last Q of the plurality of CUs.
    Type: Application
    Filed: April 8, 2022
    Publication date: July 21, 2022
    Applicant: HFI INNOVATION INC.
    Inventors: Chen-Yen LAI, Tzu-Der CHUANG, Ching-Yeh CHEN, Chih-Wei HSU
  • Method and Apparatus of Luma Most Probable Mode List Derivation for Video Coding
    Publication number: 20220232205
    Abstract: Method and apparatus of video coding are disclosed. According to one method, in the decoder side, a predefined Intra mode is assigned to a neighboring block adjacent to the current luma block when the neighboring block satisfies one or more conditions. An MPM (Most Probable Mode) list is derived based on information comprising at least one of neighboring Intra modes. A current Intra mode is derived utilizing the MPM list. The current luma block is decoded according to the current Intra mode According to another method, a predefined Intra mode is assigned to a neighboring block adjacent to the current luma block if the neighboring block is coded in BDPCM (Block-based Delta Pulse Code Modulation) mode, where the predefined Intra mode is set to horizontal mode or vertical mode depending on prediction direction used by the BDPCM mode.
    Type: Application
    Filed: May 7, 2020
    Publication date: July 21, 2022
    Inventors: Man-Shu CHIANG, Chih-Wei HSU, Tzu-Der CHUANG, Ching-Yeh CHEN, Yu-Wen HUANG, Shih-Ta HSIANG
  • Signaling of quantization matrices
    Patent number: 11394973
    Abstract: A method for signaling scaling matrices for transform coefficient quantization is provided. A video decoder receives data from a bitstream to be decoded as a current picture of a video. The video decoder determines a plurality of scaling matrices that are used to code the current picture, wherein a first scaling matrix of the plurality of scaling matrices is determined by referencing a previously determined second scaling matrix of the plurality of scaling matrices. The video decoder dequantizes transform coefficients of transform blocks of the current picture by using the determined plurality of scaling matrices. The video decoder reconstructs the current picture by using the dequantized transform coefficients.
    Type: Grant
    Filed: July 6, 2020
    Date of Patent: July 19, 2022
    Inventors: Chen-Yen Lai, Olena Chubach, Tzu-Der Chuang, Ching-Yeh Chen, Chih-Wei Hsu, Yu-Wen Huang
  • Method and Apparatus of Chroma Direct Mode Generation for Video Coding
    Publication number: 20220224891
    Abstract: A method and apparatus of prediction for video coding are disclosed. According to one method, a luma Intra prediction mode is determined for a corresponding luma block collocated with the current chroma block, where a predefined mode is assigned to the luma Intra prediction mode when the corresponding luma block collocated with the current chroma block satisfies one or more conditions. A chroma Intra prediction mode is determined for the current chroma block according to the luma Intra prediction mode. The current chroma block is then encoded or decoded according to the chroma Intra prediction mode. According to another method, a predefined mode is assigned to Intra prediction mode for the current block when the current block satisfies one or more conditions. The current block is then encoded or decoded according to the Intra prediction mode.
    Type: Application
    Filed: May 6, 2020
    Publication date: July 14, 2022
    Inventors: Man-Shu CHIANG, Chih-Wei HSU, Tzu-Der CHUANG, Ching-Yeh CHEN, Yu-Wen HUANG, Shih-Ta HSIANG
  • Method and Apparatus of Partitioning Small Size Coding Units with Partition Constraints
    Publication number: 20220224890
    Abstract: In a method and apparatus for video encoding, the method includes receiving a root block at an encoder side or receiving compressed data comprising the root block at a decoder side, wherein the root block consists of one or more child blocks resulted from partitioning a coding area using a partition mode and the root block comprises one luma component and one or more chroma components in a 420 or 422 chroma format; determining a target mode type for all of said one or more child blocks within the root block when one or more conditions are satisfied; and encoding said one or more child blocks in the root block according to the target mode type at the encoder side or applying decoding to the compressed data according to the target mode type to reconstruct said one or more child blocks in the root block at the decoder side.
    Type: Application
    Filed: February 16, 2022
    Publication date: July 14, 2022
    Inventors: Zhi-Yi LIN, Tzu-Der CHUANG, Ching-Yeh CHEN
  • Methods and Apparatuses for Coding Video Data with Adaptive Secondary Transform Signaling
    Publication number: 20220224898
    Abstract: Video processing methods and apparatuses implemented in a video encoding or decoding system with conditional secondary transform signaling. The video encoding system determines and applies a transform operation to residuals of one or more transform blocks to generate final transform coefficients, and skip signaling a secondary transform index if a position of a last significant coefficient in each considered transform block is less than or equal to a predefined position; otherwise, the video encoding system signals a secondary transform index according to the transform operation.
    Type: Application
    Filed: April 15, 2020
    Publication date: July 14, 2022
    Inventors: Man-Shu CHIANG, Chih-Wei HSU, Tzu-Der CHUANG, Ching-Yeh CHEN
  • Video Processing Methods and Apparatuses of Determining Motion Vectors for Storage in Video Coding Systems
    Publication number: 20220217397
    Abstract: Video processing methods and apparatuses for coding a current block include receiving input data of a current block, splitting the current block into sub-blocks, deriving motion information for the sub-blocks, performing motion compensation for the sub-blocks using the motion information to derive a final predictor, deriving and storing a representative motion vector for each grid in the current block, and encoding or decoding the current block using the final predictor. The representative motion vector for grids in a weighted area is determined by combining the motion vectors of the sub-blocks if the motion vectors of the sub-blocks are in different lists. The representative motion vector for grids in the weighted area is determined as one of the motion vectors of the sub-blocks if the motion vectors of the sub-blocks are in the same list.
    Type: Application
    Filed: March 23, 2022
    Publication date: July 7, 2022
    Inventors: Yu-Ling HSIAO, Ching-Yeh CHEN, Tzu-Der CHUANG, Chih-Wei HSU
  • Method and apparatus of improved merge with motion vector difference for video coding
    Patent number: 11381838
    Abstract: A prediction method and apparatus for video coding include a set of Merge candidates having an MMVD (Merge mode with motion vector differences (MVD)) candidate are generated. When the current block has a block size belonging to at least one default block size, whether a target candidate in the set of Merge candidates is bi-prediction is determined after the set of Merge candidates is generated. If the target candidate is bi-prediction: the target candidate is replaced by a uni-prediction candidate; the uni-prediction candidate is included in the set of Merge candidates to generate a modified set of Merge candidates; and current motion information associated with the current block is encoded using the modified set of Merge candidates at the video encoder side or the current motion information associated with the current block is decoded at the video decoder side using the modified set of Merge candidates.
    Type: Grant
    Filed: November 15, 2019
    Date of Patent: July 5, 2022
    Assignee: HFI INNOVATION INC.
    Inventors: Chen-Yen Lai, Yu-Ling Hsiao, Tzu-Der Chuang, Ching-Yeh Chen
  • Method and apparatus of matrix based intra prediction in image and video processing
    Patent number: 11381808
    Abstract: An intra prediction method includes receiving input data of a current block in a current picture, deriving reference samples of the current block from boundary samples, selecting a matrix for the current block, generating intermediate predicted samples by multiplying the reference samples and the matrix, and clipping the intermediate predicted samples before up-sampling. The intra prediction method further includes performing an up-sampling process on the clipped intermediate predicted samples to generate predicted samples for the current block, and encoding or decoding the current block according to the predicted samples of the current block.
    Type: Grant
    Filed: April 16, 2020
    Date of Patent: July 5, 2022
    Assignee: HFI Innovation Inc.
    Inventors: Zhi-Yi Lin, Tzu-Der Chuang, Ching-Yeh Chen
  • Video processing methods and apparatuses for sub-block motion compensation in video coding systems
    Patent number: 11381834
    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.
    Type: Grant
    Filed: April 2, 2019
    Date of Patent: July 5, 2022
    Assignee: HFI INNOVATION INC.
    Inventors: Tzu-Der Chuang, Ching-Yeh Chen, Chen-Yen Lai, Chih-Wei Hsu
  • Method and Apparatus of Matrix based Intra Prediction in Image and Video Processing
    Publication number: 20220210470
    Abstract: An image or video processing method comprises receiving input data of a current block, mapping an MIP mode index to a default mode, and encoding or decoding the current block by referencing the default mode. Another image or video processing method comprises receiving input data of a current block coded or to be coded by an MIP mode, and parsing or signaling a transpose flag for the current block indicating whether transposing is applied in coding the current block. Reference samples of the current block are prepared from neighboring boundary samples according to the transpose flag. A matrix is selected to be multiplied to the reference samples to generate predicted samples. A transposing process is adaptively applied to the current block according to the transpose flag, and the predicted samples are used to encode or decode the current block.
    Type: Application
    Filed: June 24, 2020
    Publication date: June 30, 2022
    Inventors: Zhi-Yi LIN, Tzu-Der CHUANG, Ching-Yeh CHEN, Chih-Wei HSU
  • Method and Apparatus of Simplified Affine Subblock Process for Video Coding System
    Publication number: 20220210439
    Abstract: Methods and apparatus of for video coding using sub-block based affine mode are disclosed. In one method, if affine fallback is used or the control-point motion vectors are the same, the sub-block based affine mode is disabled in order to reduce computational complexity. According to another method for video coding using a coding tool belonging to a coding tool group comprising Prediction Refinement with Optical Flow (PROF) and Bi-Directional Optical Flow (BDOF), predictor refinement is derived for pixels of a target subblock of the current block, where a step to derive the predictor refinement comprises to derive gradients for the pixels of the target subblock of the current block and to right-shift the first gradients by a common shift.
    Type: Application
    Filed: April 10, 2020
    Publication date: June 30, 2022
    Inventors: Chen-Yen LAI, Tzu-Der CHUANG, Ching-Yeh CHEN
  • Method and apparatus of constrained layer-wise video coding
    Patent number: 11375182
    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.
    Type: Grant
    Filed: December 15, 2020
    Date of Patent: June 28, 2022
    Assignee: HFI INNOVATION INC.
    Inventors: Tzu-Der Chuang, Chih-Wei Hsu, Ching-Yeh Chen, Lulin Chen
  • Method and apparatus of video coding with affine motion compensation
    Patent number: 11375226
    Abstract: An embodiment of the method receives input data associated with a current block in a current picture at a video encoder or receiving a video bitstream corresponding to compressed data including the current block in the current picture at a video decoder, wherein the current block is coded or to be coded in an affine mode according to an affine motion model; calculates and storing affine parameters for a plurality of coded blocks in the current picture; retrieves the affine parameters of one or more coded blocks from the temporal buffer; derives an affine candidate including affine motion vectors using the retrieved affine parameters of the neighboring block; and encodes or decodes the current block by predicting the current block using one or more motion compensated blocks by the derived affine candidate.
    Type: Grant
    Filed: March 24, 2020
    Date of Patent: June 28, 2022
    Assignee: HFI INNOVATION INC.
    Inventors: Tzu-Der Chuang, Ching-Yeh Chen, Han Huang, Xiaozhong Xu, Shan Liu