公开(公告)号：US20240089461A1

公开(公告)日：2024-03-14

申请号：US18511360

申请日：2023-11-16

Applicant: TENCENT AMERICA LLC

Inventor： Yixin DU ,  Byeongdoo CHOI ,  Xiang LI ,  Xin ZHAO ,  Stephen WENGER ,  Shan LIU

IPC: H04N19/146 ,  H04N19/122 ,  H04N19/169 ,  H04N19/186 ,  H04N19/46

CPC classification number: H04N19/146 ,  H04N19/122 ,  H04N19/186 ,  H04N19/1883 ,  H04N19/46

Abstract: A method of video coding, executable by a processor, includes receiving video data having a coding tree unit size, determining whether the coding tree unit size is greater than a predetermined threshold, and in response to the coding tree unit size being greater than the predetermined threshold, signaling, in a sequence parameter set (SPS), a first flag indicating whether a maximum transform size in luma samples is equal to 64. The first flag being equal to 1 specifies that the maximum transform size in luma samples is equal to 64, the first flag equal to 0 specifies that the maximum transform size in luma samples is equal to 32, and when not present, the first flag is inferred to be equal to 0.

公开(公告)号：US20230232041A1

公开(公告)日：2023-07-20

申请号：US18189001

申请日：2023-03-23

Applicant: Tencent America LLC

Inventor： Yixin DU ,  Xin Zhao ,  Shan Liu

IPC: H04N19/593 ,  H04N19/186 ,  H04N19/82 ,  H04N19/176

CPC classification number: H04N19/593 ,  H04N19/82 ,  H04N19/176 ,  H04N19/186

Abstract: A method of video decoding includes decoding prediction information of a current block indicating a subset of combinations of processed reconstructed samples of a first component and corresponding offset values of a filter process to be applied to a second color component, and determining an offset value of the filter process to apply to reconstructed samples of the second color component based on a combination of processed reconstructed samples of the first component. The determined offset value is based on whether the combination of the processed reconstructed samples of the first color component corresponds to or is different from the combinations of the processed reconstructed samples.

公开(公告)号：US20230083933A1

公开(公告)日：2023-03-16

申请号：US17993538

申请日：2022-11-23

Applicant: TENCENT AMERICA LLC

Inventor： Yixin DU ,  Xin ZHAO ,  Shan LIU

IPC: H04N19/117 ,  H04N19/124 ,  H04N19/186 ,  H04N19/132

Abstract: Aspects of the disclosure provide methods and apparatuses for video encoding/decoding. In some examples, an apparatus for filtering in video decoding includes processing circuitry. For example, the processing circuitry determines first reconstructed sample values of reconstructed samples of a first color component within a filter support region of a to-be filtered sample of a second color component. The to-be filtered sample is at a center position of the filter support region. Based on a mapping that associates offset values with reconstructed sample values within the filter support region, a first offset value of the offset values in the mapping that is associated with the first reconstructed sample values is determined. The first offset value is applied on the second color component for the to-be filtered sample to determine a filtered sample value of the second color component for the to-be filtered sample.

公开(公告)号：US20230016219A1

公开(公告)日：2023-01-19

申请号：US17941738

申请日：2022-09-09

Applicant: TENCENT AMERICA LLC

Inventor： Yixin DU ,  Liang ZHAO ,  Xin ZHAO ,  Shan LIU

IPC: H04N19/117 ,  H04N19/44 ,  H04N19/176 ,  H04N19/186 ,  H04N19/139

Abstract: A method, a non-transitory computer readable medium, and a computer system is provided for encoding or decoding video data. The method may include: receiving video data comprising a chroma component and a luma component; parsing, deriving or selecting a number of presets for the chroma component in one frame, and a number of presets for the luma component in the one frame; and decoding the video data. The method may further comprise: performing a separate Constrained Directional Enhancement Filter (CDEF) process of filtering luma and chroma components independent from each other based on the number of presets for the chroma component in one frame, and the number of presets for the luma component in the one frame.

公开(公告)号：US20220279198A1

公开(公告)日：2022-09-01

申请号：US17748839

申请日：2022-05-19

Applicant: Tencent America LLC

Inventor： Yixin DU ,  Xin ZHAO ,  Liang ZHAO ,  Shan LIU

IPC: H04N19/44 ,  H04N19/132 ,  H04N19/117 ,  H04N19/82 ,  H04N19/176 ,  H04N19/137 ,  H04N19/513 ,  H04N19/186 ,  H04N19/159

Abstract: Aspects of the disclosure provide methods and apparatuses for video encoding/decoding. In some examples, an apparatus includes processing circuitry. For example, the processing circuitry obtains reconstructed samples in a temporal source frame that is different from a current frame, and determines filter coefficients of a filter for a current block in the current frame based on at least the reconstructed samples in the temporal source frame. The processing circuitry generates prediction information of the current block based on the determined filter coefficients. The temporal source frame is an inter coded frame that satisfies at least one of a quantization parameter (QP) requirement, a temporal distance requirement, and a reference picture requirement.

公开(公告)号：US20220150536A1

公开(公告)日：2022-05-12

申请号：US17360840

申请日：2021-06-28

Applicant: TENCENT AMERICA LLC

Inventor： Yixin DU ,  Xin ZHAO ,  Shan LIU

IPC: H04N19/593 ,  H04N19/176 ,  H04N19/82 ,  H04N19/186

Abstract: Aspects of the disclosure include methods, apparatuses, and non-transitory computer-readable storage mediums for video encoding/decoding. An apparatus includes processing circuitry decoding prediction information of a current block, which indicates a plurality of combinations of processed reconstructed samples and corresponding output values of a filter process. The processing circuitry performs the filter process on processed reconstructed samples of a first color component of the current block. The processed reconstructed samples of the first color are not included in the plurality of combinations of the processed reconstructed samples. The processing circuitry determines an output value of the filter process based on one of a default value, a predicted output value, and one of the output values indicated in the prediction information. The processing circuitry reconstructs the current block based on the output value being applied to a second color component of the current block that is different from the first color component.

公开(公告)号：US20210250597A1

公开(公告)日：2021-08-12

申请号：US17091605

申请日：2020-11-06

Applicant: Tencent America LLC

Inventor： Yixin DU ,  Xin ZHAO ,  Liang ZHAO ,  Shan LIU

IPC: H04N19/44 ,  H04N19/132 ,  H04N19/117 ,  H04N19/82 ,  H04N19/159 ,  H04N19/137 ,  H04N19/513 ,  H04N19/186 ,  H04N19/176

Abstract: Aspects of the disclosure provide methods and apparatuses for video encoding/decoding. In some examples, an apparatus for video decoding includes processing circuitry. For example, the processing circuitry generates first reconstructed samples of a current block in a current frame. Further, the processing circuitry obtains reconstructed samples in a temporal source frame that is different from the current frame, and applies a filter to at least the reconstructed samples in the temporal source frame to generate offsets. Then, the processing circuitry combines the first reconstructed samples of the current block with the offsets to generate second reconstructed samples of the current block.

公开(公告)号：US20210195182A1

公开(公告)日：2021-06-24

申请号：US17092157

申请日：2020-11-06

Applicant: Tencent America LLC

Inventor： Yixin DU ,  Xin ZHAO ,  Liang ZHAO ,  Xiang LI ,  Shan LIU

IPC: H04N19/117 ,  H04N19/82 ,  H04N19/46 ,  H04N19/159 ,  H04N19/186 ,  H04N19/176

Abstract: An image processing method includes obtaining statistics information of a block of an image frame, determining whether the statistics information satisfies a condition, and disabling cross-component filtering (CCF) for the block in response to the statistics information satisfying the condition.

公开(公告)号：US20240137576A1

公开(公告)日：2024-04-25

申请号：US18396473

申请日：2023-12-26

Applicant: TENCENT AMERICA LLC

Inventor： Xiang LI ,  Xin ZHAO ,  Yixin DU ,  Liang ZHAO ,  Shan LIU

IPC: H04N19/82 ,  H04N19/117 ,  H04N19/132 ,  H04N19/176 ,  H04N19/186 ,  H04N19/46

CPC classification number: H04N19/82 ,  H04N19/117 ,  H04N19/132 ,  H04N19/176 ,  H04N19/186 ,  H04N19/46

Abstract: A method for video encoding includes determining a filter shape of a cross-component filter applied to a chroma coding block (CB), generating a first intermediate CB by applying a loop filter to the chroma CB, and generating a second intermediate CB by applying, to a corresponding luma CB, the cross-component filter applied to the chroma CB and having the determined filter shape. The method further includes determining a filtered chroma CB based on the first intermediate CB and the second intermediate CB by combining the loop filtered chroma CB with the cross-component filtered luma CB, and generating coded information of the chroma CB in a coded video bitstream. Determining the filter shape includes determining the filter shape of the cross-component filter based on the number of the filter coefficients and based on at least one of (i) the chroma subsampling format or (ii) the chroma sample type.

公开(公告)号：US20230239513A1

公开(公告)日：2023-07-27

申请号：US18184990

申请日：2023-03-16

Applicant: TENCENT AMERICA LLC

Inventor： Xin ZHAO ,  Yixin DU ,  Shan LIU

IPC: H04N19/82 ,  H04N19/593 ,  H04N19/86 ,  H04N19/186 ,  H04N19/172 ,  H04N19/132

CPC classification number: H04N19/82 ,  H04N19/86 ,  H04N19/132 ,  H04N19/172 ,  H04N19/186 ,  H04N19/593

Abstract: In a method, a filter shape is determined from a plurality of filter shapes of a sample offset filter to be applied to a reconstructed sample of a current component in a current picture. A coded video bitstream is generated based on samples of the current picture and the determined filter shape of the sample offset filter. The coded video bitstream includes coded information that indicates the filter shape. A top most sample of the first reconstructed samples in the plurality of filter shapes is located within a first predetermined number of top rows above a center reconstructed sample of the first component that is co-located with the reconstructed sample of the current component. A bottom most sample of the first reconstructed samples in the plurality of filter shapes is located within a second predetermined number of bottom rows below the center reconstructed sample of the first component.