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    Sample adaptive offset for high dynamic range (HDR) video compression
    1.
    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.

    Smoothed directional and DC intra prediction
    2.
    发明授权
    Smoothed directional and DC intra prediction 有权

    公开(公告)号：US12267506B2

    公开(公告)日：2025-04-01

    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 ,  H04N19/176 ,  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.

    Temporally-overlapped video encoding, video decoding and video rendering techniques therefor
    3.
    发明授权
    Temporally-overlapped video encoding, video decoding and video rendering techniques therefor 有权

    公开(公告)号：US11323730B2

    公开(公告)日：2022-05-03

    申请号：US16561478

    申请日：2019-09-05

    Applicant: Apple Inc.

    Inventor： Mei Guo ,  Jun Xin ,  Yeping Su ,  Hsi-Jung Wu ,  Alexandros Tourapis

    IPC: G01R31/34 ,  H02P29/024 ,  H01H71/70 ,  H04N19/44 ,  H04N19/159 ,  H04N19/177 ,  H04N19/172 ,  H04N19/46

    Abstract: Techniques for video exchange are disclosed in which a video source sends redundant copies of video coded at a given presentation time. A decoder may determine, from metadata stored with a first decoded frame, whether other decoded frames have been designated as correlated to the first decoded frame. If so, the decoder may fetch other decoding frames using time indicator values of other decoded frames in metadata stored with the first decoded frame. When other decoded frame(s) are found, the decoder may blend content of the first coded frame and the other decoded frame(s). The decoder may render the blended frame. When one such coded frame is an intra-coded frame, the proposed technique may alleviate beating artifacts by blending recovered data of the intra-coded frame with recovered data of another frame, which may be inter-coded.

    SMOOTHED DIRECTIONAL AND DC INTRA PREDICTION
    4.
    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.

    SMOOTHED DIRECTIONAL AND DC INTRA PREDICTION
    7.
    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
    9.
    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.

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