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    TECHNIQUES FOR REDUCING CODING ARTIFACTS IN CODING SYSTEM
    1.
    发明申请
    TECHNIQUES FOR REDUCING CODING ARTIFACTS IN CODING SYSTEM 有权

    公开(公告)号：US20230070492A1

    公开(公告)日：2023-03-09

    申请号：US17886858

    申请日：2022-08-12

    Applicant: Apple Inc.

    Inventor： Jiancong Luo ,  Dzung T. Hoang ,  Francesco Iacopino ,  Linfeng Guo ,  Mukta S. Gore ,  Ryan Baldwin ,  Supradeep T. Rangarajan ,  Xiaohua Yang

    IPC: H04N19/154 ,  H04N19/124 ,  H04N19/18 ,  H04N19/176

    Abstract: Techniques for reducing reduce coding artifacts in video data are disclosed. In one aspect, a frame of video data is partitioned into pixel blocks, which are organized into slices. The pixel blocks of each slice are coded by a compression algorithm and an estimate of coding artifacts in the slice is made. For slices that are estimated to possess coding artifacts, the method revises coding parameters applied to pixel blocks in the slice and recodes the slice. The method substitutes recoded slices for originally-coded slices in frame, working in a priority order from a slice with the highest estimated likelihood of coding artifacts down to slices with lower estimated likelihoods of coding artifacts, measuring changes in the frame's coding size as it goes. The likelihood of coding artifacts can be estimated from slice statistics that may be developed from a comparison of transform coefficients among the pixel blocks within a slice, from an evaluation of transform coefficients of a pixel block with a slice that is estimated to have a lowest spatial complexity, or from coded luma data of the pixel blocks within a slice. In a further aspect, slice statistics may be computed from pixel block data only for a subset of slices within a frame. Slice statistics for other slices may be derived from the statistics of neighboring slices. In another aspect, a method may revise coding parameters in iterative fashion working from an initialized value and estimate (without recoding them) data sizes of coded slices that may be obtained from the revised parameters. As the method operates, it may compare the coding parameters to parameters used in a first iteration of coding and terminate the iterative process for that slice if the first iteration coding parameters are higher than the revised parameter.

    Selectable transcode engine systems and methods
    2.
    发明授权
    Selectable transcode engine systems and methods 有权

    公开(公告)号：US11206415B1

    公开(公告)日：2021-12-21

    申请号：US17020708

    申请日：2020-09-14

    Applicant: Apple Inc.

    Inventor： Athanasios Leontaris ,  Yaxiong Zhou ,  Francesco Iacopino

    IPC: H04N19/40 ,  H04N19/184 ,  H04N19/146 ,  H04N19/91

    Abstract: An electronic device includes a video encoding pipeline configured to encode source image data. The video encoding pipeline includes a first transcode engine and a second transcode engine. The electronic device also includes processing circuitry configured to determine a target throughput for a bin stream and determine whether to encode the bin stream using only the first transcode engine or both the first and second transcode engines based on the target throughput. The processing circuitry is also configured to cause only the first transcode engine to encode the bin stream or both the first and second transcode engines to encode the bin stream based on determining whether to encode the bin stream using only the first transcode engine or both the first and second transcode engines.

    Selectable transcode engine systems and methods
    3.
    发明授权
    Selectable transcode engine systems and methods 有权

    公开(公告)号：US11716480B2

    公开(公告)日：2023-08-01

    申请号：US17547001

    申请日：2021-12-09

    Applicant: Apple Inc.

    Inventor： Athanasios Leontaris ,  Yaxiong Zhou ,  Francesco Iacopino

    IPC: H04N19/40 ,  H04N19/184 ,  H04N19/146 ,  H04N19/91

    CPC classification number: H04N19/40 ,  H04N19/146 ,  H04N19/184 ,  H04N19/91

    Abstract: An electronic device includes a video encoding pipeline configured to encode source image data. The video encoding pipeline includes a first transcode engine and a second transcode engine. The electronic device also includes processing circuitry configured to determine a target throughput for a bin stream and determine whether to encode the bin stream using only the first transcode engine or both the first and second transcode engines based on the target throughput. The processing circuitry is also configured to cause only the first transcode engine to encode the bin stream or both the first and second transcode engines to encode the bin stream based on determining whether to encode the bin stream using only the first transcode engine or both the first and second transcode engines.

    SELECTABLE TRANSCODE ENGINE SYSTEMS AND METHODS
    7.
    发明申请
    SELECTABLE TRANSCODE ENGINE SYSTEMS AND METHODS 有权

    公开(公告)号：US20220103844A1

    公开(公告)日：2022-03-31

    申请号：US17547001

    申请日：2021-12-09

    Applicant: Apple Inc.

    Inventor： Athanasios Leontaris ,  Yaxiong Zhou ,  Francesco Iacopino

    IPC: H04N19/40 ,  H04N19/184 ,  H04N19/146 ,  H04N19/91

    Abstract: An electronic device includes a video encoding pipeline configured to encode source image data. The video encoding pipeline includes a first transcode engine and a second transcode engine. The electronic device also includes processing circuitry configured to determine a target throughput for a bin stream and determine whether to encode the bin stream using only the first transcode engine or both the first and second transcode engines based on the target throughput. The processing circuitry is also configured to cause only the first transcode engine to encode the bin stream or both the first and second transcode engines to encode the bin stream based on determining whether to encode the bin stream using only the first transcode engine or both the first and second transcode engines.

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