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    REDUCING BLOCKINESS FOR CODECS
    111.
    发明公开
    REDUCING BLOCKINESS FOR CODECS 审中-公开

    公开(公告)号：US20240048776A1

    公开(公告)日：2024-02-08

    申请号：US17956444

    申请日：2022-09-29

    Applicant: Apple Inc.

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

    IPC: H04N19/86 ,  H04N19/117 ,  H04N19/139 ,  H04N19/176

    CPC classification number: H04N19/86 ,  H04N19/117 ,  H04N19/139 ,  H04N19/176

    Abstract: Disclosed is a method that includes receiving an image frame having a plurality of coded blocks, determining a prediction unit (PU) from the plurality of coded blocks, determining one or more motion compensation units arranged in an array within the PU, and applying a filter to one or more boundaries of the one or more motion compensation units. Also disclosed is a method that includes receiving a reference frame that includes a reference block, determining a timing for deblocking a current block, performing motion compensation on the reference frame to obtain a predicted frame that includes a predicted block, performing reconstruction on the predicted frame to obtain a reconstructed frame that includes a reconstructed PU, and applying, at the timing for deblocking the current block, a deblocking filter based on one or more parameters to the reference block, the predicted block, or the reconstructed PU.

    COEFFICIENT-BASED TRANSFORM AND MODE SIGNALING
    112.
    发明公开
    COEFFICIENT-BASED TRANSFORM AND MODE SIGNALING 审中-公开

    公开(公告)号：US20240040151A1

    公开(公告)日：2024-02-01

    申请号：US18312077

    申请日：2023-05-04

    Applicant: Apple Inc.

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

    IPC: H04N19/60 ,  H04N19/124 ,  H04N19/18 ,  H04N19/172

    CPC classification number: H04N19/60 ,  H04N19/124 ,  H04N19/18 ,  H04N19/172

    Abstract: Techniques are described for express and implied signaling of transform mode selections in video coding. Information derived from coefficient samples in a given transform unit (TU) or prediction unit (PU) may constrain or modify signaling of certain syntax elements at the coding block (CB), TU, or PU levels. For instance, based on the spatial locations of decoded coefficients, the spatial patterns of coefficients, or the correlation with the coefficients in neighboring blocks, various syntax elements such as the transform type and related flags/indices or secondary transform modes/flags indices, a residual coding mode, intra and inter prediction modes, and scanning order may be disabled or constrained. In another case, if the coefficient samples match a desired spatial pattern or have other desired properties then a default transform type, a default secondary transform type, a default intra and inter prediction mode or other block level modes may be inferred at the decoder side. Similar ideas may be extended to infer intra-block copy (IBC) flags/modes/indices from coefficient samples, or to infer flags and modes related to predictive coding techniques such as block-wise differential pulse code modulation (BDPCM), i.e., horizontal and vertical BDPCM modes, palette mode syntax and other block level flags/indices.

    Immersive Video Streaming Using View-Adaptive Prefetching and Buffer Control
    114.
    发明申请
    Immersive Video Streaming Using View-Adaptive Prefetching and Buffer Control 有权

    公开(公告)号：US20230117742A1

    公开(公告)日：2023-04-20

    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 ,  H04N21/218 ,  H04N21/24 ,  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.

    Multidimensional quantization techniques for video coding/decoding systems
    115.
    发明授权
    Multidimensional quantization techniques for video coding/decoding systems 有权

    公开(公告)号：US11539974B2

    公开(公告)日：2022-12-27

    申请号：US17493607

    申请日：2021-10-04

    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.

    Point cloud occupancy map compression
    117.
    发明授权
    Point cloud occupancy map compression 有权

    公开(公告)号：US11361471B2

    公开(公告)日：2022-06-14

    申请号：US15931349

    申请日：2020-05-13

    Applicant: Apple Inc.

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

    IPC: G06T7/50 ,  G06T9/00 ,  G06T7/70 ,  G06T7/20 ,  A01C3/02 ,  G08B1/00 ,  G09B1/00 ,  G06T1/00 ,  G11B7/002

    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. A block/sub-block organization scheme is used to encode blocks and sub-blocks of an occupancy map used in compressing the point cloud. Binary values are assigned to blocks/sub-blocks based on whether they contain patches projected on the point cloud. A traversal path is chosen that takes advantage of run-length encoding strategies to reduce a size of an encoded occupancy map. Also, auxiliary information is used to further improve occupancy map compression.

    Temporally-overlapped video encoding, video decoding and video rendering techniques therefor
    118.
    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.

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