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    HARDWARE FRIENDLY DESIGN FOR MOTION FIELD PROCESSING AND QUALITY IMPROVEMENT OF MOTION FIELD
    21.
    发明公开
    HARDWARE FRIENDLY DESIGN FOR MOTION FIELD PROCESSING AND QUALITY IMPROVEMENT OF MOTION FIELD 审中-公开

    公开(公告)号：US20240340438A1

    公开(公告)日：2024-10-10

    申请号：US18593281

    申请日：2024-03-01

    Applicant: Apple Inc.

    Inventor： Yeqing WU ,  Yunfei ZHENG ,  Yixin DU ,  Alican NALCI ,  Hilmi E. EGILMEZ ,  Guoxin JIN ,  Alexandros TOURAPIS ,  Jun XIN ,  Hsi-Jung WU

    IPC: H04N19/52 ,  H04N19/105 ,  H04N19/124 ,  H04N19/127 ,  H04N19/154 ,  H04N19/172 ,  H04N19/176

    CPC classification number: H04N19/52 ,  H04N19/105 ,  H04N19/124 ,  H04N19/127 ,  H04N19/154 ,  H04N19/172 ,  H04N19/176

    Abstract: Techniques are proposed to improve temporal motion projection in video coding. Candidate reference frames available for use in temporal motion projection are sorted in processing order according to scores assigned based on estimates of the reference frames' suitability for prediction. Such estimates may be based on temporal distance between each candidate reference frame and that reference frame's prediction references. Estimates may be based, for each reference frame, based on an estimate of coding quality of a reference frame from which the respective candidate reference frame makes a prediction reference. Once sorted, the candidate reference frames may be processing in the sorting order to supply prediction data to a current frame that is to be coded from the candidate reference frames. Additionally, hardware friendly designs of motion field hole filling and motion vector smoothing operations are proposed. Such designs can reduce hardware implementation complexity and benefit hardware parallel processing in several aspects: by removing the dependency among different processing block rows for hole filling and motion vector smoothing so that it is becomes easier and friendlier to achieve hardware parallel processing; by reducing the hardware bandwidth loading overhead; by improving hardware pipeline throughput; and/or by avoiding adding a line buffer to store the data from the above row since a line buffer will increase hardware cost.

    VIDEO PROCESSORS FOR PRESERVING DETAIL IN LOW-LIGHT SCENES
    26.
    发明申请
    VIDEO PROCESSORS FOR PRESERVING DETAIL IN LOW-LIGHT SCENES 有权
    用于在低光照下保存细节的视频处理器

    公开(公告)号：US20140321534A1

    公开(公告)日：2014-10-30

    申请号：US14056043

    申请日：2013-10-17

    Applicant: Apple Inc.

    Inventor： Yeping SU ,  Chris Y. CHUNG ,  Hao PAN ,  Hsi-Jung WU ,  Ke ZHANG

    IPC: H04N19/117 ,  H04N19/124 ,  H04N19/139 ,  H04N19/136 ,  H04N19/179

    CPC classification number: H04N19/117 ,  H04N19/136

    Abstract: Video coding systems and methods are provided that protect against various artifacts (e.g., banding artifacts) in decoded frame content. The embodiments to protect against introducing artifacts include pre-processing the input video frame, controlling the encoding parameters and/or post-processing the decoded video frame. A method for encoding a frame may include calculating a dark-scene score for the frame based on measured statistics of the frame. The dark-scene score may be compared to a threshold to determine if the banding artifacts may be present in the frame. Based on the comparison, filtering parameters for the frame may be altered to reduce the amount of noise filtered from the frame. The frame may be filtered based on the altered filtering parameters and encoded.

    Abstract translation: 提供了视频编码系统和方法，其防止解码的帧内容中的各种伪影（例如，带状伪影）。 防止引入伪像的实施例包括预处理输入视频帧，控制编码参数和/或后处理解码的视频帧。 用于编码帧的方法可以包括基于所测量的帧的统计来计算所述帧的暗场景得分。 暗场景得分可以与阈值进行比较，以确定条带伪像是否可能存在于帧中。 基于该比较，可以改变帧的滤波参数以减少从帧滤波的噪声量。 可以基于改变的滤波参数对帧进行滤波并进行编码。

    HYPOTHETICAL REFERENCE DECODER
    27.
    发明申请
    HYPOTHETICAL REFERENCE DECODER 有权

    公开(公告)号：US20130182778A1

    公开(公告)日：2013-07-18

    申请号：US13731819

    申请日：2012-12-31

    Applicant: Apple Inc.

    Inventor： Hsi-Jung WU ,  Barin Geoffry Haskell ,  Xiaojin Shi ,  James Oliver Normile

    IPC: H04N7/26

    CPC classification number: H04N19/44 ,  H04N19/149 ,  H04N19/152

    Abstract: Disclosed is a system and method of controlling a video decoder, including a reviewing channel data representing coded video data generated by an encoder to identify parameters of a hypothetical reference decoder (HRD) used by the encoder during coding operations. A parameter representing an exit data rate requirement of a coded picture buffer (CPB) of the HRD is compared against exit rate performance of the video decoder. If the exit rate performance of the video coder matches the exit rate requirement of the HRD, the coded video data is decoded, otherwise, a certain decoding degradation scheme can be applied, including disabling decoder from decoding the coded video data.

    FLEXIBLE COEFFICIENT CODING IN VIDEO COMPRESSION
    28.
    发明公开
    FLEXIBLE COEFFICIENT CODING IN VIDEO COMPRESSION 审中-公开

    公开(公告)号：US20240040124A1

    公开(公告)日：2024-02-01

    申请号：US18358094

    申请日：2023-07-25

    Applicant: Apple Inc.

    Inventor： Alican NALCI ,  Yunfei ZHENG ,  Hilmi Enes EGILMEZ ,  Yeqing WU ,  Yixin DU ,  Alexandros TOURAPIS ,  Jun XIN ,  Hsi-Jung WU ,  Arash VOSOUGHI ,  Dzung T. HOANG

    IPC: H04N19/13 ,  H04N19/70 ,  H04N19/61 ,  H04N19/176

    CPC classification number: H04N19/13 ,  H04N19/70 ,  H04N19/61 ,  H04N19/176

    Abstract: A flexible coefficient coding (FCC) approach is presented. In the first aspect, spatial sub-regions are defined over a transform unit (TU) or a prediction unit (PU). These sub-regions organize the coefficient samples residing inside a TU or a PU into variable coefficient groups (VCGs). Each VCG corresponds to a sub-region inside a larger TU or PU. The shape of VCGs or the boundaries between different VCGs may be irregular, determined based on the relative distance of coefficient samples with respect to each other. Alternatively, the VCG regions may be defined according to scan ordering within a TU. Each VCG can encode a 1) different number of symbols for a given syntax element, or a 2) different number of syntax elements within the same TU or PU. Whether to code more symbols or more syntax elements may depend on the type of arithmetic coding engine used in a particular coding specification. For multi-symbol arithmetic coding (MS-AC), a VCG may encode a different number of symbols for a syntax element. For example, to encode absolute coefficient values inside a TU after performing a transform such as the discrete cosine transform (DCT), a VCG region may be defined around lower-frequency transform coefficients and for that VCG M-symbols can be encoded the absolute coefficient values. Another VCG region can be defined around the higher-frequency transform coefficients to encode K-symbols, where K may be different than M. For binary arithmetic coders (BACs), FCC allows for coding a variable number of syntax elements in different VCGs. In this case, one VCG in a TU may code M-syntax elements associated with signaling the absolute coefficient value, where each one of the M-syntax elements may have 2-symbols. Probability models and context derivation rules may be tailored for each VCG in a given TU or PU. Since each VCG may code a different number of symbols or syntax elements in different spatial locations of a TU or PU, different context models may be used for each VCG to provide better granularity for entropy modeling for arithmetic coding. Furthermore, different VCGs may also use different entropy coders including combinations of arithmetic coding, Golomb-Rice coding, Huffman coding.

    ANALYTIC- AND APPLICATION-AWARE VIDEO DERIVATIVE GENERATION TECHNIQUES
    30.
    发明公开
    ANALYTIC- AND APPLICATION-AWARE VIDEO DERIVATIVE GENERATION TECHNIQUES 审中-公开

    公开(公告)号：US20230396819A1

    公开(公告)日：2023-12-07

    申请号：US18327364

    申请日：2023-06-01

    Applicant: APPLE INC.

    Inventor： Ke ZHANG ,  Xiaoxia SUN ,  Shujie LIU ,  Xiaosong ZHOU ,  Jian LI ,  Xun SHI ,  Jiefu ZHAI ,  Albert E KEINATH ,  Hsi-Jung WU ,  Jingteng XUE ,  Xingyu ZHANG ,  Jun XIN

    IPC: H04N21/2343 ,  H04N7/01 ,  G06V40/16 ,  G06V40/20 ,  G06V30/10 ,  H04N21/231

    CPC classification number: H04N21/2343 ,  H04N7/0127 ,  H04N21/231 ,  G06V40/20 ,  G06V30/10 ,  G06V40/172

    Abstract: A video delivery system generates and stores reduced bandwidth videos from source video. The system may include a track generator that executes functionality of application(s) to be used at sink devices, in which the track generator generates tracks from execution of the application(s) on source video and generates tracks having a reduced data size as compared to the source video. The track generator may execute a first instance of application functionality on the source video, which identifies region(s) of interest from the source video. The track generator further may downsample the source video according to downsampling parameters, and execute a second instance of application functionality on the downsampled video. The track generator may determine, from a comparison of outputs from the first and second instances of the application, whether the output from the second instance of application functionality is within an error tolerance of the output from the first instance of application functionality. If so, the track generator may generate a track from the downsampled video. In this manner, the system generates tracks that enable reliable application operation when processed by sink devices but also have reduced size as compared to source video.

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