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    Chroma quantization in video coding
    42.
    发明公开
    Chroma quantization in video coding 审中-公开

    公开(公告)号：EP4485929A3

    公开(公告)日：2025-03-19

    申请号：EP24213557.2

    申请日：2014-08-15

    Applicant: Apple Inc.

    Inventor： TOURAPIS, Alexandros ,  COTE, Guy

    IPC: H04N19/124 ,  H04N19/30 ,  H04N19/174 ,  H04N19/176 ,  H04N19/463 ,  H04N19/61 ,  H04N19/126 ,  H04N19/157 ,  H04N19/186 ,  H04N19/70 ,  H04N19/86

    Abstract: There is provided a method comprising: receiving in a bitstream an encoded video picture comprising a plurality of coding units, a plurality of chroma quantization parameter (QP) offset values, and a plurality of quantization groups, each quantization group defined to include a set of coding units in the plurality of coding units of the encoded video picture; and decoding the encoded video picture by computing a plurality of chroma QPs for the video picture and using the computed chroma QPs to decode the video picture. Said computing the plurality of chroma QPs comprising computing a chroma QP value for each of the coding units of each of the plurality of quantization groups by (i) using an index associated with the quantization group to select a chroma QP offset value from the plurality of chroma QP offset values and (ii) computing the chroma QP value for the coding unit of the quantization group based on the selected chroma QP offset value and a luma QP value associated with the coding unit.

    Chroma quantization in video coding
    43.
    发明公开
    Chroma quantization in video coding 审中-公开

    公开(公告)号：EP4489398A2

    公开(公告)日：2025-01-08

    申请号：EP24213554.9

    申请日：2014-08-15

    Applicant: Apple Inc.

    Inventor： TOURAPIS, Alexandros ,  COTE, Guy

    IPC: H04N19/30

    Abstract: There is provided a method comprising: receiving a plurality of sets of chroma quantization parameter (QP) offset values associated with an encoded video picture, wherein an encoded video picture includes a plurality of quantization groups, each quantization group comprising at least one coding unit; selecting one set of chroma QP offset values from the plurality of sets of chroma QP offset values for a particular quantization group from the plurality of quantization groups; and computing a set of chroma quantization parameters for a coding unit in the particular quantization group based on the selected set of chroma QP offset values and a luma QP value associated with the coding unit.

    Chroma quantization in video coding
    48.
    发明公开
    Chroma quantization in video coding 审中-公开

    公开(公告)号：EP4485929A2

    公开(公告)日：2025-01-01

    申请号：EP24213557.2

    申请日：2014-08-15

    Applicant: Apple Inc.

    Inventor： TOURAPIS, Alexandros ,  COTE, Guy

    IPC: H04N19/30

    Abstract: There is provided a method comprising: receiving in a bitstream an encoded video picture comprising a plurality of coding units, a plurality of chroma quantization parameter (QP) offset values, and a plurality of quantization groups, each quantization group defined to include a set of coding units in the plurality of coding units of the encoded video picture; and decoding the encoded video picture by computing a plurality of chroma QPs for the video picture and using the computed chroma QPs to decode the video picture. Said computing the plurality of chroma QPs comprising computing a chroma QP value for each of the coding units of each of the plurality of quantization groups by (i) using an index associated with the quantization group to select a chroma QP offset value from the plurality of chroma QP offset values and (ii) computing the chroma QP value for the coding unit of the quantization group based on the selected chroma QP offset value and a luma QP value associated with the coding unit.

    MULTI-FEATURE SAMPLE OFFSET FILTERING SYSTEM FOR VIDEO CODING AND DECODING
    49.
    发明公开
    MULTI-FEATURE SAMPLE OFFSET FILTERING SYSTEM FOR VIDEO CODING AND DECODING 审中-公开

    公开(公告)号：EP4178202A1

    公开(公告)日：2023-05-10

    申请号：EP22205085.8

    申请日：2022-11-02

    Applicant: Apple Inc.

    Inventor： DU, Yixin ,  TOURAPIS, Alexandros ,  ZHENG, Yunfei ,  XIN, Jun ,  NALCI, Alican ,  GUO, Mei ,  WU, Yeqing ,  WU, Hsi-Jung

    IPC: H04N19/117 ,  H04N19/186 ,  H04N19/70 ,  H04N19/82 ,  H04N19/86

    Abstract: A filtering system for video coders and decoders is disclosed that includes a feature detector having an input for samples reconstructed from coded video data representing a color component of source video, and having an output for data identifying a feature recognized therefrom, an offset calculator having an input for the feature identification data from the feature detector and having an output for a filter offset, and a filter having an input for the filter offset from the offset calculator and an input for the reconstructed samples, and having an output for filtered samples. The filtering system is expected to improve operations of video coder/decoder filtering systems by selecting filtering offsets from analysis of recovered video data in a common color plane as the samples that will be filtered.

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