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    SMOOTHED DIRECTIONAL AND DC INTRA PREDICTION
    21.
    发明申请
    SMOOTHED DIRECTIONAL AND DC INTRA PREDICTION 有权

    公开(公告)号：US20210243451A1

    公开(公告)日：2021-08-05

    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 ,  H04N19/176 ,  H04N19/182

    Abstract: Techniques are disclosed for 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.

    Deblocking filter for high dynamic range (HDR) video
    23.
    发明授权
    Deblocking filter for high dynamic range (HDR) video 有权

    公开(公告)号：US10212456B2

    公开(公告)日：2019-02-19

    申请号：US15612806

    申请日：2017-06-02

    Applicant: Apple Inc.

    Inventor： Mei Guo ,  Feng Yi ,  Jun Xin ,  Chris Y. Chung ,  Yeping Su ,  Xiaosong Zhou ,  Jun Xu ,  Hsi-Jung Wu ,  Jingteng Xue

    IPC: H04N19/86 ,  H04N19/117 ,  H04N19/159

    Abstract: Methods of in-loop deblocking filter for high dynamic range (HDR) video compression are disclosed. HDR processing and standard dynamic range (SDR) processing adopt different electro-optical transfer function (EOTF) to convert digital code words to linear luminance. For compressing HDR video, EOTF is proposed to be involved in the selection of two deblocking parameters, β and tC, which control the strength of deblocking filter. In local activity checking for filter decisions, the calculated local signal characteristics and the thresholds are adjusted according to EOTF. After deblocking filter, the clipping range is modified based on EOTF. The chroma deblocking filter is also extended to inter-inter block boundary.

    Content Adaptation for Streaming
    25.
    发明申请
    Content Adaptation for Streaming 审中-公开

    公开(公告)号：US20170359580A1

    公开(公告)日：2017-12-14

    申请号：US15614881

    申请日：2017-06-06

    Applicant: Apple Inc.

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

    IPC: H04N19/139 ,  H04N19/103 ,  H04N19/44 ,  G06N99/00 ,  H04N21/845

    CPC classification number: G06N20/00 ,  H04N19/103 ,  H04N19/136 ,  H04N19/179 ,  H04N21/23439 ,  H04N21/8456

    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.

    Environment-Aware Supervised HDR Tone Mapping
    26.
    发明申请
    Environment-Aware Supervised HDR Tone Mapping 审中-公开

    公开(公告)号：US20170353704A1

    公开(公告)日：2017-12-07

    申请号：US15611636

    申请日：2017-06-01

    Applicant: Apple Inc.

    Inventor： Yeping Su ,  Chris Chung ,  Hsi-Jung Wu ,  Xiaosong Zhou ,  Jun Xin ,  Jun Xu

    IPC: H04N9/64 ,  G06T5/00 ,  H04N5/58

    Abstract: Embodiments of the present disclosure provide techniques for environment aware supervised HDR tone mapping. According to those techniques, responsive to metadata provided with HDR source video data, the received metadata may be compared to sensor date representing viewing conditions at a display device. Tone mapping corrections to the HDR source video data may be derived from the comparison of the received metadata to the sensor data. The HDR source video data may be altered based on the tone mapping corrections. The altered HDR source video data may be used to drive the display device.

    Immersive video streaming using view-adaptive prefetching and buffer control
    28.
    发明授权
    Immersive video streaming using view-adaptive prefetching and buffer control 有权

    公开(公告)号：US11924391B2

    公开(公告)日：2024-03-05

    申请号：US18083468

    申请日：2022-12-16

    Applicant: Apple Inc.

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

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

    CPC classification number: H04N13/117 ,  H04N13/178 ,  H04N21/21805 ,  H04N21/2401 ,  H04N21/2402

    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
    29.
    发明申请
    SMOOTHED DIRECTIONAL AND DC INTRA PREDICTION 有权

    公开(公告)号：US20220303554A1

    公开(公告)日：2022-09-22

    申请号：US17837846

    申请日：2022-06-10

    Applicant: Apple Inc.

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

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

    Abstract: Techniques are disclosed for 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.

    CONTENT ADAPTATION FOR STREAMING
    30.
    发明申请
    CONTENT ADAPTATION FOR STREAMING 有权

    公开(公告)号：US20220030244A1

    公开(公告)日：2022-01-27

    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 ,  H04N19/103 ,  G06N20/00 ,  H04N19/179

    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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