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    SMOOTHED DIRECTIONAL AND DC INTRA PREDICTION
    232.
    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.

    Point cloud compression with multi-layer projection
    233.
    发明授权
    Point cloud compression with multi-layer projection 有权

    公开(公告)号：US11282238B2

    公开(公告)日：2022-03-22

    申请号：US17032711

    申请日：2020-09-25

    Applicant: Apple Inc.

    Inventor： Khaled Mammou ,  Yeping Su ,  David W. Singer ,  Alexandros Tourapis ,  Fabrice A. Robinet ,  Hsi-Jung Wu

    IPC: G06T7/20 ,  G06T9/00 ,  G06T7/50 ,  H04N19/172 ,  G06T5/00 ,  G06T19/20

    Abstract: A system comprises an encoder configured to compress attribute information and/or spatial for a point cloud and/or a decoder configured to decompress compressed attribute and/or spatial information for the point cloud. To compress the attribute and/or spatial information, the encoder is configured to convert a point cloud into an image based representation. Also, the decoder is configured to generate a decompressed point cloud based on an image based representation of a point cloud. The encoder is configured project the point cloud on to patch planes to compress the point cloud, and supports multiple layered patch planes. For example, some point clouds may have a depth, and points at different depths may be assigned to different layered patch planes.

    CONTENT ADAPTATION FOR STREAMING
    235.
    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.

    Multidimensional quantization techniques for video coding/decoding systems
    239.
    发明授权
    Multidimensional quantization techniques for video coding/decoding systems 有权

    公开(公告)号：US11153594B2

    公开(公告)日：2021-10-19

    申请号：US15250608

    申请日：2016-08-29

    Applicant: Apple Inc.

    Inventor： Alexandros Tourapis ,  Yeping Su ,  David Singer ,  Hsi-Jung Wu

    IPC: H04N19/50 ,  H04N19/184 ,  H04N19/167 ,  H04N19/436 ,  H04N19/186 ,  H04N19/132 ,  H04N19/124 ,  H04N19/13 ,  H04N19/15 ,  H04N19/30 ,  H04N19/42 ,  H04N19/48 ,  H04N19/182

    Abstract: Video compression and decompression techniques are disclosed that provide improved bandwidth control for video compression and decompression systems. In particular, video coding and decoding techniques quantize input video in multiple dimensions. According to these techniques, pixel residuals may be generated from a comparison of an array of input data to an array of prediction data. The pixel residuals may be quantized in a first dimension. After the quantization, the quantized pixel residuals may be transformed to an array of transform coefficients. The transform coefficients may be quantized in a second dimension and entropy coded. Decoding techniques invert these processes. In still other embodiments, multiple quantizers may be provided upstream of the transform stage, either in parallel or in cascade, which provide greater flexibility to video coders to quantize data in different dimensions in an effort to balance the competing interest in compression efficiency and quality of reconstructed video.

    Sphere projected motion estimation/compensation and mode decision
    240.
    发明授权
    Sphere projected motion estimation/compensation and mode decision 有权

    公开(公告)号：US10999602B2

    公开(公告)日：2021-05-04

    申请号：US15390202

    申请日：2016-12-23

    Applicant: Apple Inc.

    Inventor： Jae Hoon Kim ,  Xiaosong Zhou ,  Dazhong Zhang ,  Hang Yuan ,  Jiefu Zhai ,  Chris Y. Chung ,  Hsi-Jung Wu

    IPC: H04N19/176 ,  H04N19/105 ,  H04N19/597 ,  H04N19/547

    Abstract: Techniques are disclosed for coding video data predictively based on predictions made from spherical-domain projections of input pictures to be coded and reference pictures that are prediction candidates. Spherical projection of an input picture and the candidate reference pictures may be generated. Thereafter, a search may be conducted for a match between the spherical-domain representation of a pixel block to be coded and a spherical-domain representation of the reference picture. On a match, an offset may be determined between the spherical-domain representation of the pixel block to a matching portion of the of the reference picture in the spherical-domain representation. The spherical-domain offset may be transformed to a motion vector in a source-domain representation of the input picture, and the pixel block may be coded predictively with reference to a source-domain representation of the matching portion of the reference picture.

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