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    Reference picture re-sampling
    2.
    发明授权
    Reference picture re-sampling 有权

    公开(公告)号：US11336913B2

    公开(公告)日：2022-05-17

    申请号：US16799423

    申请日：2020-02-24

    Applicant: Apple Inc.

    Inventor： Krishnakanth Rapaka ,  Alexandros Tourapis ,  David W. Singer

    IPC: H04N19/503 ,  H04N19/86 ,  H04N19/82

    Abstract: Predictive coding techniques may include resampling of reference pictures, where various coding parameters are determined based on the resolution(s) or pixel format(s) of the prediction references. In a first aspect, lists of weights for use in weighted prediction are based on the resolution(s) of prediction references. In a second aspect, resampling filter parameters are selected based on the resolutions of prediction references. In a third aspect, deblocking filter parameters are based on the resolution(s) of prediction references.

    SMOOTHED DIRECTIONAL AND DC INTRA PREDICTION
    3.
    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.

    Deep quality enhancement of adaptive downscaled coding for image compression
    7.
    发明授权
    Deep quality enhancement of adaptive downscaled coding for image compression 有权

    公开(公告)号：US10764588B2

    公开(公告)日：2020-09-01

    申请号：US16100310

    申请日：2018-08-10

    Applicant: Apple Inc.

    Inventor： Xiang Fu ,  Linfeng Guo ,  Haiyan He ,  Wei Li ,  Xu Gang Zhao ,  Hao Pan ,  Xiaohua Yang ,  Krishnakanth Rapaka ,  Munehiro Nakazato ,  Haitao Guo

    IPC: H04N19/176 ,  H04N19/126 ,  G06T7/13 ,  G06N3/08

    Abstract: Techniques are disclosed for coding image data adaptively at different levels of downscaling. Such techniques may involve partitioning input data into pixel blocks for coding and performing content analysis on the pixel blocks. The pixel blocks may be input to block coders that operate at different pixel block sizes, which may code the pixel blocks input to them at their respective sizes. Except when a block coder operates at the partitioning size, block coders that operate at different pixel block sizes may perform downscaling of the pixel blocks to match their size with the block coders' respective coding size. A block decoder may invert the coding operations performed by the block coders, decoding coded image data at respective pixel block sizes, then upscaling decoded image data obtained therefrom to a common pixel block size. Image reconstruction may synthesize a resultant image from the decode pixel block data output by the decoders. Quality enhancements may be added by neural network processing systems that have been trained to other segmented images.

    Multi-stage block coding
    9.
    发明授权
    Multi-stage block coding 有权

    公开(公告)号：US11962786B2

    公开(公告)日：2024-04-16

    申请号：US17671512

    申请日：2022-02-14

    Applicant: Apple Inc.

    Inventor： Krishnakanth Rapaka ,  Alexandros Tourapis ,  David William Singer

    IPC: H04N19/176 ,  H04N19/103 ,  H04N19/119 ,  H04N19/124 ,  H04N19/136 ,  H04N19/159 ,  H04N19/50

    CPC classification number: H04N19/176 ,  H04N19/103 ,  H04N19/119 ,  H04N19/124 ,  H04N19/136 ,  H04N19/159 ,  H04N19/50

    Abstract: A multi-stage coding method includes receiving an input block of data for encoding and one or more previously coded samples associated with the input block. The input block is segmented into at least a first sub-region and a second sub-region. A prediction for the first sub-region is generated based on the one or more previously coded samples. Residual data for the first sub-region is obtained using the prediction for the first sub-region. A reconstruction of the first sub-region is generated using the residual data for the first sub-region and the prediction for the first sub-region. A prediction for the second sub-region is generated using the reconstruction of the first sub-region. Residual data for the second sub-region is obtained using the prediction for the second sub-region. The input block is encoded based in part on the residual data for the first region and the residual data for the second region.

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