公开(公告)号：US20230224503A1

公开(公告)日：2023-07-13

申请号：US18180525

申请日：2023-03-08

Applicant: TENCENT AMERICA LLC

Inventor： Yixin DU ,  Xin ZHAO ,  Shan LIU

IPC: H04N19/82 ,  H04N19/107 ,  H04N19/132 ,  H04N19/186 ,  H04N19/105 ,  H04N19/503 ,  H04N19/117 ,  H04N19/593 ,  H04N19/70 ,  H04N19/14 ,  H04N19/159 ,  H04N19/176

CPC classification number: H04N19/82 ,  H04N19/107 ,  H04N19/132 ,  H04N19/186 ,  H04N19/105 ,  H04N19/503 ,  H04N19/117 ,  H04N19/593 ,  H04N19/70 ,  H04N19/14 ,  H04N19/159 ,  H04N19/176

Abstract: A method for in-loop sample offset filtering in a video decoder is disclosed. The method includes obtaining at least one statistical property associated with reconstructed samples of at least a first color component in a current reconstructed data block of a video stream, selecting a target sample offset filter among a plurality of sample offset filters based on the at least one statistical property, the target sample offset filter comprising a nonlinear mapping between sample delta measures and sample offset values, and filtering a current sample in a second color component of the current reconstructed data block using the target sample offset filter and reference samples in a third color component of the current reconstructed data block to generate a filtered reconstructed sample of the current sample.

公开(公告)号：US20230029856A1

公开(公告)日：2023-02-02

申请号：US17956392

申请日：2022-09-29

Applicant: TENCENT AMERICA LLC

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

IPC: H04N19/117 ,  H04N19/80 ,  H04N19/176 ,  H04N19/46 ,  H04N19/70 ,  H04N19/119

Abstract: A method of loop filtering in a video coding process comprises receiving image data; analyzing the image data; flexibility partitioning the image data into loop filtering blocks (LFBs) to allow the size of LFBs in at least one of a first row and a first column in a same frame to be smaller than other LFBs within the same frame; and applying a loop filter to the LFBs.

公开(公告)号：US20220303585A1

公开(公告)日：2022-09-22

申请号：US17495318

申请日：2021-10-06

Applicant: Tencent America LLC

Inventor： Xin ZHAO ,  Yixin DU ,  Shan LIU

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

Abstract: Aspects of the disclosure provide methods and apparatus for video decoding. Processing circuitry of the apparatus decodes coded information for a reconstructed sample of a current component in a current picture from a coded video bitstream. The coded information indicates a sample offset filter to be applied to the reconstructed sample. A filter shape of the sample offset filter is one of a plurality of filter shapes. Each of the plurality of filter shapes includes first reconstructed samples of a first component in the current picture. A filtered sample value of the reconstructed sample is determined based on the first reconstructed samples in the filter shape. The sample offset filter is an in-loop filter by which the output value is applied to the reconstructed sample as an offset to filter out coding artifacts while retaining details of the current component in the current picture.

公开(公告)号：US20220303530A1

公开(公告)日：2022-09-22

申请号：US17837466

申请日：2022-06-10

Applicant: TENCENT AMERICA LLC

Inventor： Yixin DU ,  Xin ZHAO ,  Shan LIU

IPC: H04N19/117 ,  H04N19/80 ,  H04N19/176 ,  H04N19/132 ,  H04N19/186 ,  H04N19/60

Abstract: A method for video coding, executable by a processor, includes receiving video data, determining a directionality of a sample block of the received video data, the directionality corresponding to a descriptor, applying a geometric transformation in which filter coefficients of a cross-component filter or reconstructed samples in a filter support region are rotated by a first amount based on the directionality being a first direction and rotated by a second amount based on the directionality being a second direction different from the first direction, and decoding the video data based on the applied geometric transformation.

公开(公告)号：US20220295054A1

公开(公告)日：2022-09-15

申请号：US17568540

申请日：2022-01-04

Applicant: TENCENT AMERICA LLC

Inventor： Xin ZHAO ,  Yixin DU ,  Shan LIU

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

Abstract: A method for in-loop sample offset filtering in a video decoder is disclosed. The method includes extracting at least one loop filtering parameter from a coded video bitstream for a reconstructed sample of a first color component in a current picture reconstructed from the coded video bitstream, the at least one loop filtering parameter comprising a flag, and determining based on the flag a type of sample offset filter to be applied to the reconstructed sample of the first color component, the type of sample offset filter being either a predefined sample offset filter type or an encoder-derived sample offset filter type. The method further includes identifying a target sample offset filter to be applied to the reconstructed sample of the first color component based at least on the determined type of sample offset filter, and filtering the reconstructed sample of the first color component based on the target sample offset filter and a plurality of reconstructed reference samples of a second color component to generate a filtered reconstructed sample of the first color component.

公开(公告)号：US20220295053A1

公开(公告)日：2022-09-15

申请号：US17449199

申请日：2021-09-28

Applicant: TENCENT AMERICA LLC

Inventor： Yixin DU ,  Xin ZHAO ,  Shan LIU

IPC: H04N19/117 ,  H04N19/82 ,  H04N19/132 ,  H04N19/70

Abstract: Aspects of the disclosure provide methods and apparatuses for video encoding/decoding. In some examples, an apparatus for video decoding includes processing circuitry. The processing circuitry determines offset values associated with a first filter shape configuration of a video filter based on signals in a coded video bitstream that carries a video. The video filter is based on non linear mapping. The number of filter taps of the first filter shape configuration is smaller than five. The processing circuitry applies the video filter on a sample to be filtered, using the offset values associated with the first filter shape configuration.

公开(公告)号：US20220191551A1

公开(公告)日：2022-06-16

申请号：US17360761

申请日：2021-06-28

Applicant: TENCENT AMERICA LLC

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

IPC: H04N19/82 ,  H04N19/176 ,  H04N19/186 ,  H04N19/119 ,  H04N19/86 ,  H04N19/593 ,  H04N19/70 ,  H04N19/117

Abstract: Aspects of the disclosure provide methods and apparatuses for video encoding/decoding. In some examples, an apparatus for video decoding includes processing circuitry. The processing circuitry determines decoupled coding information of a first color component and a second color component of a block based on decoded information in a coded video bitstream. Then, the processing circuitry reconstructs a first sample of the first color component at a location in the block based on a first loop filter configuration, and reconstructs a second sample of the second color component at the location in the block based on a second loop filter configuration that is different from the first loop filter configuration.

公开(公告)号：US20220182680A1

公开(公告)日：2022-06-09

申请号：US17368734

申请日：2021-07-06

Applicant: TENCENT AMERICA LLC

Inventor： Yixin DU ,  Xin ZHAO ,  Shan LIU

IPC: H04N19/80 ,  H04N19/132 ,  H04N19/184 ,  H04N19/70 ,  H04N19/103 ,  H04N19/117 ,  H04N19/136

Abstract: Aspects of the disclosure provide methods and apparatuses for video encoding/decoding. In some examples, an apparatus for video decoding includes processing circuitry. The processing circuitry reconstructs a first sample in a video carried in a coded video bitstream based on a non linear mapping based filter with a first filter shape configuration. Then, the processing circuitry determines a switch from the first filter shape configuration to a second filter shape configuration, and reconstructs a second sample in the video based on the non linear mapping based filter with the second filter shape configuration.

公开(公告)号：US20220116635A1

公开(公告)日：2022-04-14

申请号：US17362048

申请日：2021-06-29

Applicant: TENCENT AMERICA LLC

Inventor： Sehoon YEA ,  Yixin DU ,  Xin ZHAO ,  Shan LIU

IPC: H04N19/44 ,  H04N19/117 ,  H04N19/82 ,  H04N19/105 ,  H04N19/159 ,  H04N19/176

Abstract: Aspects of the disclosure include methods, apparatuses, and non-transitory computer-readable storage mediums for video encoding/decoding. An apparatus includes processing circuitry that determines directionality information of a restoration filter unit included in a video frame based on at least one of a constrained directional enhancement filter (CDEF) process or an intra prediction mode. The processing circuitry determines one of a plurality of sets of filter parameters of a restoration filter process based on the directionality information of the restoration filter unit. The processing circuitry performs the restoration filter process on the restoration filter unit based on the one of the plurality of sets of filter parameters. The processing circuitry reconstructs the video frame based on the filtered restoration filter unit.

公开(公告)号：US20210400266A1

公开(公告)日：2021-12-23

申请号：US17091759

申请日：2020-11-06

Applicant: TENCENT AMERICA LLC

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

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

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.