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    Encoding techniques for banding reduction
    124.
    发明授权
    Encoding techniques for banding reduction 有权
    用于条带缩减的编码技术

    公开(公告)号：US09565404B2

    公开(公告)日：2017-02-07

    申请号：US13707404

    申请日：2012-12-06

    Applicant: Apple Inc.

    Inventor： Yeping Su ,  Hsi-Jung Wu ,  Hao Pan

    IPC: H04N7/26 ,  H04N19/10 ,  H04N19/117 ,  H04N19/463 ,  H04N19/14 ,  H04N19/17 ,  H04N19/80 ,  H04N19/176 ,  H04N19/61 ,  H04N19/577

    CPC classification number: H04N19/10 ,  H04N19/117 ,  H04N19/14 ,  H04N19/17 ,  H04N19/176 ,  H04N19/463 ,  H04N19/577 ,  H04N19/61 ,  H04N19/80

    Abstract: Video encoders often produce banding artifacts on areas with smooth gradients and low levels of detail/noise. In this disclosure, a video encoding system identifies the banded areas and adjusts coding parameters accordingly. The video coder may include a pre-coding banding detector and a post-coding banding detector. The pre-coding detector may identify regions in the input picture with smooth gradients that are likely to have banding artifacts after encoding. The post-coding detector may identify regions in the reconstructed picture with visible banding. Usage of pre-coding detector and/or post-coding detector depends on how an encoder operates. In a single-pass encoding or during the first pass of a multi-pass encoding, the pre-coding detection maps are used. During picture re-encoding or during later passes of a multi-pass encoding, the post-coding detector maps are used.

    Abstract translation: 视频编码器经常在平滑梯度和低细节/噪音水平的区域产生带状伪影。 在本公开中，视频编码系统识别带状区域并相应地调整编码参数。 视频编码器可以包括预编码带状检测器和后编码条带检测器。 预编码检测器可以在编码后可能具有可能具有带状伪影的平滑梯度来识别输入图像中的区域。 后编码检测器可以用可见条带识别重建图像中的区域。 预编码检测器和/或后编码检测器的使用取决于编码器如何工作。 在单遍编码中或在多遍编码的第一遍期间，使用预编码检测图。 在图像重新编码期间或在多遍编码的稍后通过期间，使用后编码检测器图。

    TECHNIQUES FOR ADAPTIVE VIDEO STREAMING
    126.
    发明申请
    TECHNIQUES FOR ADAPTIVE VIDEO STREAMING 审中-公开
    适应性视频流的技术

    公开(公告)号：US20160073106A1

    公开(公告)日：2016-03-10

    申请号：US14703366

    申请日：2015-05-04

    Applicant: Apple Inc.

    Inventor： Yeping Su ,  Hsi-Jung Wu ,  Ke Zhang ,  Chris Y. Chung ,  Xiaosong Zhou

    IPC: H04N19/10

    CPC classification number: H04N19/10 ,  H04N21/234363 ,  H04N21/23439 ,  H04N21/23805 ,  H04N21/8456 ,  H04N21/8543

    Abstract: In a video coding system, a common video sequence is coded multiple times to yield respective instances of coded video data. Each instance may be coded according to a set coding parameters derived from a target bit rate of a respective tier of service. Each tier may be coded according to a constraint that limits a maximum coding rate of the tier to be less than a target bit rate of another predetermined tier of service. Having been coded according to the constraint facilitates dynamic switching among tiers by a requesting client device processing resources or communication bandwidth changes. Improved coding systems to switch among different coding streams may increase quality of video streamed while minimizing transmission and storage size of such content.

    Abstract translation: 在视频编码系统中，公共视频序列被多次编码以产生编码视频数据的各个实例。 每个实例可以根据从相应服务等级的目标比特率导出的集合编码参数进行编码。 每个层可以根据将该层的最大编码率限制为小于另一预定服务层的目标比特率的约束进行编码。 已经根据约束进行编码有助于请求客户端设备处理资源或通信带宽变化的层之间的动态切换。 改进的在不同编码流之间切换的编码系统可以提高视频流的质量，同时最小化这些内容的传输和存储大小。

    DYNAMIC RANGE ADAPTIVE VIDEO CODING SYSTEM
    127.
    发明申请
    DYNAMIC RANGE ADAPTIVE VIDEO CODING SYSTEM 审中-公开
    动态范围自适应视频编码系统

    公开(公告)号：US20150350641A1

    公开(公告)日：2015-12-03

    申请号：US14636839

    申请日：2015-03-03

    Applicant: Apple Inc.

    Inventor： Xiaosong Zhou ,  Jiefu Zhai ,  Yeping Su ,  Chris Y. Chung ,  Hsi-Jung Wu

    IPC: H04N19/105 ,  H04N19/159 ,  H04N19/13 ,  H04N19/176 ,  H04N19/18 ,  H04N19/119 ,  H04N19/167

    CPC classification number: H04N19/105 ,  H04N19/119 ,  H04N19/13 ,  H04N19/159 ,  H04N19/167 ,  H04N19/176 ,  H04N19/18 ,  H04N19/85 ,  H04N19/98

    Abstract: A video coding/decoding system codes data efficiently even when input video data exhibits changes in dynamic range. The system may map pixel values of the first frame from a dynamic range specific to the input image data to a second dynamic range that applies universally to a plurality of frames that have different dynamic ranges defined for them. The system may code the mapped pixel values to reduce bandwidth of the mapped frame data, and thereafter transmit the coded image data to a channel.

    Abstract translation: 视频编码/解码系统即使在输入视频数据表现出动态范围的变化时，也能有效地对数据进行编 该系统可将来自特定于输入图像数据的动态范围的第一帧的像素值映射到通常适用于为它们定义的不同动态范围的多个帧的第二动态范围。 系统可以对映射的像素值进行编码以减少映射的帧数据的带宽，然后将编码的图像数据发送到信道。

    ADVANCED CODING TECHNIQUES
    128.
    发明申请
    ADVANCED CODING TECHNIQUES 审中-公开
    先进的编码技术

    公开(公告)号：US20130235928A1

    公开(公告)日：2013-09-12

    申请号：US13652311

    申请日：2012-10-15

    Applicant: APPLE, INC.

    Inventor： Chris Y. Chung ,  Hao Pan ,  Jiefu Zhai ,  Yeping Su ,  Douglas Scott Price ,  Hsi-Jung Wu ,  Xiaosong Zhou

    IPC: H04N7/32 ,  H04N7/26

    CPC classification number: H04N19/577 ,  H04N19/107 ,  H04N19/117 ,  H04N19/124 ,  H04N19/139 ,  H04N19/149 ,  H04N19/15 ,  H04N19/154 ,  H04N19/156 ,  H04N19/172 ,  H04N19/192 ,  H04N19/46 ,  H04N19/58

    Abstract: Embodiments of the present invention provide techniques for efficiently coding/decoding video data during circumstances when constraints are imposed on the video data. A frame from a video sequence may be marked as a delayed decoder refresh frame. Frames successive to the delayed decoder refresh frame in coding order may predictively coded without reference to frames preceding the delayed decoder refresh frame in coding order. The distance between the delayed decoder refresh frame and the successive frames may exceed a distance threshold. Frames successive to a current frame in decoding order may be decoded without reference to frames preceding the current frame in decoding order. The distance between the current frame and the successive frames may exceed a distance threshold.

    Abstract translation: 本发明的实施例提供了在对视频数据施加约束的情况下有效地对视频数据进行编码/解码的技术。 来自视频序列的帧可被标记为延迟解码器刷新帧。 以编码顺序连续到延迟解码器刷新帧的帧可以以编码顺序预先编码而不参考延迟解码器刷新帧之前的帧。 延迟解码器刷新帧和连续帧之间的距离可以超过距离阈值。 可以解码顺序对当前帧连续的帧进行解码，而不参考当前帧之前的帧。 当前帧与连续帧之间的距离可能会超过距离阈值。

    Content adaptation for streaming
    130.
    发明授权
    Content adaptation for streaming 有权

    公开(公告)号：US12149699B2

    公开(公告)日：2024-11-19

    申请号：US17492789

    申请日：2021-10-04

    Applicant: Apple Inc.

    Inventor： Yeping Su ,  Xingyu Zhang ,  Chris Chung ,  Jun Xin ,  Hsi-Jung Wu

    IPC: H04N19/136 ,  G06N20/00 ,  H04N19/103 ,  H04N19/179 ,  H04N21/2343 ,  H04N21/845

    Abstract: Techniques are disclosed by which a coding parameter is determined to encode video data resulting in encoded video data possessing a highest possible video quality. Features may be extracted from an input video sequence. The extracted features may be compared to features described in a model of coding parameters generated by a machine learning algorithm from reviews of previously-coded videos, extracted features of the previously-coded videos, and coding parameters of the previously-coded videos. When a match is detected between the extracted features of the input video sequence and extracted features represented in the model, a determination may be made as to whether coding parameters that correspond to the matching extracted feature correspond to a tier of service to which the input video sequence is to be coded. When the coding parameters that correspond to the matching extracted feature correspond to the tier of service to which the input video sequence is to be coded, the input video sequence may be coded according to the coding parameters.

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