Patents by Inventor Kai Zhang

Kai Zhang 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).

  • SIGNALING FOR TRANSFORM SKIP MODE
    Publication number: 20230209072
    Abstract: A video processing method includes performing a conversion between a video block of a video and a coded representation of the video. The coded representation conforms to a format rule. The format rule specifies that applicability of a transform skip mode to the video block is determined by a coding condition of the video block. The format rule also specifies that a syntax element indicative of applicability of the transform skip mode is omitted from the coded representation. The transform skip mode includes skipping applying a forward transform to at least some coefficients prior to encoding into the coded representation, or during decoding, skipping applying an inverse transform to at least some coefficients prior to decoding from the coded representation.
    Type: Application
    Filed: February 22, 2023
    Publication date: June 29, 2023
    Inventors: Li Zhang, Kai Zhang, Hongbin Liu, Jizheng Xu, Yue Wang
  • INTERACTION BETWEEN MERGE LIST CONSTRUCTION AND OTHER TOOLS
    Publication number: 20230209084
    Abstract: Device, methods, and systems that enable the interaction of merge list construction with other tools and methods in video coding are described. An exemplary method for video processing includes determining, based on a first threshold, a maximum number of history-based motion vector prediction (HMVP) candidates to be checked in a table, making a decision regarding a selective checking of a number of the HMVP candidates in an order, the number of the HMVP candidates checked not exceeding the maximum number of HMVP candidates, constructing, based on the decision, a motion candidates list, and performing, based on the motion candidates list, a conversion between a current block and a bitstream representation of the current block.
    Type: Application
    Filed: March 10, 2023
    Publication date: June 29, 2023
    Inventors: Li Zhang, Kai Zhang, Hongbin Liu, Yue Wang
  • GEOMETRIC PARTITIONING MODE IN VIDEO CODING
    Publication number: 20230209054
    Abstract: A method of visual media processing, including: determining, for a conversion between a current video block of a visual media data and a bitstream representation of the visual media data, that a partitioning mode coding tool is disabled for the conversion based on a rule that depends on a dimension of the current video block; and performing the conversion based on the determining.
    Type: Application
    Filed: February 21, 2023
    Publication date: June 29, 2023
    Inventors: Li Zhang, Kai Zhang, Hongbin Liu, Yue Wang
  • Alignment of prediction weights in video coding
    Patent number: 11689735
    Abstract: A method of video processing is described. The method includes determining chroma weights used for determining a chroma prediction block of a chroma block of a current block of a video by blending predictions of the chroma block according to a rule, and performing a conversion between the current block and a coded representation of the video according to the determining, wherein the rule specifies that the chroma weights are determined from luma weights of a collocated luma block of the current block; wherein the current block is coded with a geometric partitioning mode.
    Type: Grant
    Filed: February 28, 2022
    Date of Patent: June 27, 2023
    Assignees: BEIJING BYTEDANCE NETWORK TECHNOLOGY CO., LTD., BYTEDANCE INC.
    Inventors: Zhipin Deng, Li Zhang, Hongbin Liu, Kai Zhang, Jizheng Xu, Yue Wang
  • Signaling of reshaping information in video processing
    Patent number: 11689746
    Abstract: A video processing method is provided, including: performing a conversion between a coded representation of a video including one or more video regions and the video, wherein the coded representation includes reshaping model information applicable for in-loop reshaping (ILR) of some of the one or more video regions, wherein the reshaping model information provides information for a reconstruction of a video unit of a video region based on a representation in a first domain and a second domain and/or scaling chroma residue of a chroma video unit, wherein the reshaping model information includes a parameter set that includes a first syntax element that derives a number of bits used to represent a second syntax element specifying an absolute delta codeword value from a corresponding bin, and wherein the first syntax element has a value smaller than a threshold.
    Type: Grant
    Filed: June 24, 2021
    Date of Patent: June 27, 2023
    Assignees: BEIJING BYTEDANCE NETWORK TECHNOLOGY CO., LTD, BYTEDANCE INC.
    Inventors: Kai Zhang, Li Zhang, Hongbin Liu, Yue Wang
  • High level syntax for video coding tools
    Patent number: 11689747
    Abstract: A method of video processing are described. The method includes determining, for a conversion between a video region of a picture of a video and a coded representation of the video, enablement status of a coding tool used to represent the video region in the coded representation; and performing the conversion according to the determination; wherein a first flag is included in a picture header to indicate the enablement status of the coding tool for the picture.
    Type: Grant
    Filed: April 11, 2022
    Date of Patent: June 27, 2023
    Assignees: BEIJING BYTEDANCE NETWORK TECHNOLOGY CO., LTD, BYTEDANCE INC.
    Inventors: Kai Zhang, Li Zhang, Hongbin Liu, Yue Wang
  • CODING MODE DEPENDENT SELECTION OF TRANSFORM SKIP MODE
    Publication number: 20230199177
    Abstract: Methods, system and apparatus for video processing are described. One example method of processing video data includes performing a conversion between a current block of a video and a bitstream of the video according to a rule. The rule specifies that whether a transform skip mode is enabled is determined based on coding information of the current block. The transform skip mode is a coding mode in which a transform is skipped on a prediction residual of a video block.
    Type: Application
    Filed: February 21, 2023
    Publication date: June 22, 2023
    Inventors: Li Zhang, Kai Zhang, Yuhuai Zhang, Hongbin Liu, Yue Wang, Siwei Ma
  • PADDING PROCESS IN ADAPTIVE LOOP FILTERING
    Publication number: 20230199190
    Abstract: An example method of video processing includes determining, for a conversion between a current block of a video and a bitstream representation of the video, that one or more samples of the video outside the current block are unavailable for a coding process of the conversion. The coding process comprises an adaptive loop filter (ALF) coding process. The method also includes performing, based on the determining, the conversion by using padded samples for the one or more samples of the video. The padded samples are generated by checking for availability of samples in an order.
    Type: Application
    Filed: February 21, 2023
    Publication date: June 22, 2023
    Inventors: Hongbin Liu, Li Zhang, Kai Zhang, Yue Wang
  • COEFFICIENT REORDERING IN VIDEO CODING
    Publication number: 20230199185
    Abstract: Methods, system and apparatus for video processing are described. One example method of processing video data includes performing a conversion between a current block of a video and a bitstream of the video according to a rule. The rule specifies that coded information of the current block determines usage of coefficient reordering by which coefficients of the current block parsed from the bitstream are reordered prior to applying a dequantization process, an inverse transform process, or a reconstruction process.
    Type: Application
    Filed: February 21, 2023
    Publication date: June 22, 2023
    Inventors: Li Zhang, Kai Zhang, Yuhuai Zhang, Hongbin Liu, Yue Wang, Siwei Ma
  • ADAPTIVE LOOP FILTERING BETWEEN DIFFERENT VIDEO UNITS
    Publication number: 20230199182
    Abstract: An example method of video processing includes determining, for a conversion between a current video unit of a video and a bitstream representation of the video, availability of one or more samples in a first neighboring region of the current block for a coding process of the conversion independently from information of a second neighboring region of the current block. The second neighboring region is adjacent to the first neighboring region, and the one or more samples are padded in case determined to be unavailable. The method includes performing the conversion based on the determining.
    Type: Application
    Filed: February 15, 2023
    Publication date: June 22, 2023
    Inventors: Hongbin Liu, Li Zhang, Kai Zhang, Yue Wang
  • Size restriction for intra-block copy virtual buffer
    Patent number: 11683476
    Abstract: A method for video processing is described. The method comprises: making a decision, for a conversion between a current video block of a video picture of a video and a coded representation of the video, regarding a size of a reference region of the video picture from which reference samples are used for predicting the current video block, based on a size of a virtual pipeline data unit (VPDU), a size of a coding tree block (CTB), or a size of a coding tree unit (CTU); and performing the conversion based on the decision.
    Type: Grant
    Filed: January 24, 2022
    Date of Patent: June 20, 2023
    Assignees: BEIJING BYTEDANCE NETWORK TECHNOLOGY CO., LTD, BYTEDANCE INC.
    Inventors: Jizheng Xu, Li Zhang, Kai Zhang, Hongbin Liu
  • Mode determining for palette mode in prediction process
    Patent number: 11683503
    Abstract: Devices, systems and methods for video processing are described. An example method for video processing includes performing a conversion between a video comprising luma blocks and corresponding chroma blocks and a bitstream representation of the video according to a rule that specifies that, for a case that a current luma block is coded using a palette coding mode and a corresponding current chroma block coded with a derived mode, the current luma block is treated as having a default intra prediction mode and the current chroma block is coded with the default intra prediction mode.
    Type: Grant
    Filed: January 20, 2022
    Date of Patent: June 20, 2023
    Assignees: BEIJING BYTEDANCE NETWORK TECHNOLOGY CO., LTD., BYTEDANCE INC.
    Inventors: Weijia Zhu, Li Zhang, Jizheng Xu, Kai Zhang, Hongbin Liu, Yue Wang
  • Methods and apparatuses for cross-component prediction
    Patent number: 11683474
    Abstract: Example implementations include a method, apparatus and computer-readable medium of video coding, comprising receiving the code block and one or more neighbor samples and determining the value of beta based on at least one of an average chroma value, a midrange chroma value, a median chroma value, an average luma value, a midrange luma value, or a median luma value of two or more neighbor samples.
    Type: Grant
    Filed: January 25, 2021
    Date of Patent: June 20, 2023
    Assignee: Lemon Inc.
    Inventors: Zhipin Deng, Kai Zhang, Li Zhang
  • Multi-parameters based intra prediction
    Patent number: 11683499
    Abstract: A method for video processing is provided. The method includes determining, for a conversion between a current video block of a video that is a chroma block and a coded representation of the video, multiple sets of parameters, wherein each set of parameters defines a cross-component linear model (CCLM) and is derived from a corresponding group of chroma samples at corresponding chroma sample positions; determining, based on the multiple sets of parameters, parameters for a final CCLM; and performing the conversion based on the final CCLM.
    Type: Grant
    Filed: May 3, 2021
    Date of Patent: June 20, 2023
    Assignees: BEIJING BYTEDANCE NETWORK TECHNOLOGY CO., LTD., BYTEDANCE INC.
    Inventors: Kai Zhang, Li Zhang, Hongbin Liu, Jizheng Xu, Yue Wang
  • Two-part signaling of adaptive loop filters in video coding
    Patent number: 11683531
    Abstract: Methods, systems and devices for signaling the usage of adaptive loop filtering in image and video coding are described. An example method of video processing includes determining, for a conversion between a current region of a video and a bitstream representation of the video, whether a luma adaptive loop filter is used during the conversion and whether luma adaptive loop filter coefficients are included in the bitstream representation, wherein a single syntax element in the bitstream representation is indicative of use of the luma adaptive loop filter and signaling of the luma adaptive loop filter coefficients, and performing, based on the determining, the conversion.
    Type: Grant
    Filed: March 16, 2022
    Date of Patent: June 20, 2023
    Assignees: BEIJING BYTEDANCE NETWORK TECHNOLOGY CO., LTD, BYTEDANCE INC.
    Inventors: Li Zhang, Hongbin Liu, Kai Zhang, Yue Wang
  • Precision transform coefficient scaling and quantization for image and video coding
    Patent number: 11683500
    Abstract: Methods, systems, and devices for high-precision transform and quantization for image and video coding are described. A example method of video processing includes determining, for a conversion between a video comprising a current block and a bitstream representation of the video, that the conversion comprises an application of a transform to the current block, and performing, based on the determining, the conversion, wherein a bit-shifting operation of a scaling process for transform coefficients associated with the transform is based on whether the current block is coded with a block-based differential pulse code modulation (BDPCM) mode.
    Type: Grant
    Filed: March 18, 2022
    Date of Patent: June 20, 2023
    Assignees: BEIJING BYTEDANCE NETWORK TECHNOLOGY CO., LTD, BYTEDANCE INC.
    Inventors: Jizheng Xu, Kai Zhang, Li Zhang, Hongbin Liu, Zhipin Deng, Yue Wang
  • Adaptive loop filtering between different video units
    Patent number: 11683488
    Abstract: An example method of video processing includes determining, for a conversion between a current video unit of a video and a bitstream representation of the video, availability of one or more samples in a first neighboring region of the current block for a coding process of the conversion independently from information of a second neighboring region of the current block. The second neighboring region is adjacent to the first neighboring region, and the one or more samples are padded in case determined to be unavailable. The method includes performing the conversion based on the determining.
    Type: Grant
    Filed: March 28, 2022
    Date of Patent: June 20, 2023
    Assignees: BEIJING BYTEDANCE NETWORK TECHNOLOGY CO., LTD., BYTEDANCE INC.
    Inventors: Hongbin Liu, Li Zhang, Kai Zhang, Yue Wang
  • Interplay between reference picture resampling and video coding tools
    Patent number: 11683479
    Abstract: An example method of video processing includes determining, for a conversion between a current block of a current picture of a video and a bitstream of the video, whether to disable a coding tool for the current block; and performing the conversion based on the determining, wherein the coding tool is disabled when a dimension of a reference picture of one or more reference pictures of the current block is different from a dimension of the current picture, or a dimension of a scaling window in a reference picture of one or more reference pictures of the current block is different from a dimension of a scaling window in the current picture.
    Type: Grant
    Filed: April 13, 2022
    Date of Patent: June 20, 2023
    Assignees: BEIJING BYTEDANCE NETWORK TECHNOLOGY CO., LTD, BYTEDANCE INC.
    Inventors: Kai Zhang, Li Zhang, Hongbin Liu
  • ALTERNATIVE INTERPOLATION FILTERS IN VIDEO CODING
    Publication number: 20230188710
    Abstract: A method of video processing is provided to include: deciding a coding mode used for representing a current video block of a video in a coded representation of the video; and coding the current video block into the coded representation according to the coding mode, wherein use of alternative half-pel accuracy filters in addition to a default half-pel accuracy filter for representing motion information is disabled for the current video block due to use of the coding mode.
    Type: Application
    Filed: February 6, 2023
    Publication date: June 15, 2023
    Inventors: Hongbin Liu, Li Zhang, Kai Zhang, Jizheng Xu, Yue Wang
  • MOTION CANDIDATE LIST CONSTRUCTION USING NEIGHBORING BLOCK INFORMATION
    Publication number: 20230188729
    Abstract: A visual media processing method includes determining, for a conversion between a first video block of a visual media data and a bitstream representation of the visual media data, an availability of a second video block of the visual media data using a rule; and performing the conversion based on the determining, wherein the rule is at least based on a coding mode used for coding the first video block into the bitstream representation, wherein the rule specifies disallowing motion information of the second video block from being used in a merge list construction of the first block by treating the second video block as unavailable.
    Type: Application
    Filed: February 6, 2023
    Publication date: June 15, 2023
    Inventors: Li Zhang, Kai Zhang, Hongbin Liu, Yue Wang