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    Content adaptation for streaming
    2.
    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.

    JOINT MOTION VECTOR CODING
    3.
    发明公开
    JOINT MOTION VECTOR CODING 审中-公开

    公开(公告)号：US20240195978A1

    公开(公告)日：2024-06-13

    申请号：US18065220

    申请日：2022-12-13

    Applicant: Apple Inc.

    Inventor： Yeqing WU ,  Yunfei Zheng ,  Alexandros Tourapis ,  Yixin Du ,  Alican Nalci ,  Hilmi E. Egilmez ,  Guoxin Jin ,  Jun Xin ,  Hsi-Jung Wu

    IPC: H04N19/137 ,  H04N19/105 ,  H04N19/172 ,  H04N19/176

    CPC classification number: H04N19/137 ,  H04N19/105 ,  H04N19/172 ,  H04N19/176

    Abstract: The present disclosure describes techniques for efficient coding of motion vectors developed for multi-hypothesis coding applications. According to these techniques, when coding hypotheses are developed, each having a motion vector identifying a source of prediction for a current pixel block, a motion vector for a first one of the coding hypotheses may be predicted from the motion vector of a second coding hypothesis. The first motion vector may be represented by coding a motion vector residual, which represents a difference between the developed motion vector for the first coding hypothesis and the predicted motion vector for the first coding hypothesis, and outputting the coded residual to a channel. In another embodiment, a motion vector residual may be generated for a motion vector of a first coding hypothesis, and the first motion vector and the motion vector residual may be used to predict a second motion vector and a predicted motion vector residual. The second hypothesis's motion vector may be coded as a difference between the motion vector, the predicted second motion vector, and the predicted motion vector residual. In a further embodiment, a single motion vector residual may be output for the motion vectors of two coding hypotheses representing a difference between the motion vector of one of the hypotheses and a predicted motion vector for that hypothesis.

    Immersive video streaming using view-adaptive prefetching and buffer control
    4.
    发明授权
    Immersive video streaming using view-adaptive prefetching and buffer control 有权

    公开(公告)号：US11570417B2

    公开(公告)日：2023-01-31

    申请号：US17326204

    申请日：2021-05-20

    Applicant: Apple Inc.

    Inventor： Fanyi Duanmu ,  Jun Xin ,  Hsi-Jung Wu ,  Xiaosong Zhou

    IPC: H04N13/00 ,  H04N21/24 ,  H04N21/218 ,  H04N13/117 ,  H04N13/178

    Abstract: A system obtains a data set representing immersive video content for display at a display time, including first data representing the content according to a first level of detail, and second data representing the content according to a second higher level of detail. During one or more first times prior to the display time, the system causes at least a portion of the first data to be stored in a buffer. During one or more second times prior to the display time, the system generates a prediction of a viewport for displaying the content to a user at the display time, identifies a portion of the second data corresponding to the prediction of the viewport, and causes the identified portion of the second data to be stored in the video buffer. At the display time, the system causes the content to be displayed to the user using the video buffer.

    Sample adaptive offset for high dynamic range (HDR) video compression
    5.
    发明授权
    Sample adaptive offset for high dynamic range (HDR) video compression 有权

    公开(公告)号：US10200687B2

    公开(公告)日：2019-02-05

    申请号：US15612880

    申请日：2017-06-02

    Applicant: Apple Inc.

    Inventor： Mei Guo ,  Jun Xin ,  Yeping Su ,  Chris Y. Chung ,  Xiaosong Zhou ,  Hsi-Jung Wu

    IPC: H04N19/117 ,  H04N19/136 ,  H04N19/186 ,  H04N19/46 ,  H04N19/157 ,  H04N19/80

    Abstract: Methods of sample adaptive offset (SAO) for high dynamic range (HDR) video compression are disclosed. For band offset (BO), the sample range of each component is unequally divided into a number of bands based on the distribution of samples, the electro-optical transfer function (EOTF) of HDR source and one perceptually uniform EOTF. Each component may have a different number of bands, different number of signaled bands, and different range value for signaled offsets in BO mode. For edge offset (EO), Cb and Cr may use separate syntax elements. In the sample classification for EO, the difference between the current sample and its neighbor is compared with a threshold to determine whether it is a local valley, a local peak, or corners. A distortion measure for HDR source images are also disclosed.

    Immersive Video Streaming Using View-Adaptive Prefetching and Buffer Control
    8.
    发明申请
    Immersive Video Streaming Using View-Adaptive Prefetching and Buffer Control 有权

    公开(公告)号：US20220377304A1

    公开(公告)日：2022-11-24

    申请号：US17326204

    申请日：2021-05-20

    Applicant: Apple Inc.

    Inventor： Fanyi Duanmu ,  Jun Xin ,  Hsi-Jung Wu ,  Xiaosong Zhou

    IPC: H04N13/117 ,  H04N21/218 ,  H04N13/178 ,  H04N21/24

    Abstract: A system obtains a data set representing immersive video content for display at a display time, including first data representing the content according to a first level of detail, and second data representing the content according to a second higher level of detail. During one or more first times prior to the display time, the system causes at least a portion of the first data to be stored in a buffer. During one or more second times prior to the display time, the system generates a prediction of a viewport for displaying the content to a user at the display time, identifies a portion of the second data corresponding to the prediction of the viewport, and causes the identified portion of the second data to be stored in the video buffer. At the display time, the system causes the content to be displayed to the user using the video buffer.

    Smoothed directional and DC intra prediction
    10.
    发明授权
    Smoothed directional and DC intra prediction 有权

    公开(公告)号：US11388419B2

    公开(公告)日：2022-07-12

    申请号：US16834693

    申请日：2020-03-30

    Applicant: Apple Inc.

    Inventor： Mei Guo ,  Jun Xin ,  Hsi-Jung Wu ,  Alexandros Tourapis ,  Krishnakanth Rapaka

    IPC: H04N19/159 ,  H04N19/182 ,  H04N19/176

    Abstract: Improved video coding techniques include deriving prediction pixel blocks for use in intra-coding video and combined inter- and intra-coding video. In a first aspect, the techniques may include deriving value(s) for pixel location(s) of the prediction pixel block by, when a prediction direction vector assigned to the prediction vector points to quadrants I or III of a Cartesian plane, deriving the pixel location's value from pixel values in two regions of previously-decoded pixel data intercepted by extending the prediction direction vector in two opposite directions through the pixel location. When the prediction direction vector points toward quadrants II of the Cartesian plane, deriving the pixel location's value from pixel values in one region intercepted by the prediction direction vector through the pixel location, and from a second region intercepted by a vector that is orthogonal to the prediction direction vector.

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