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    SELECTION OF MOTION VECTOR PRECISION
    3.
    发明申请
    SELECTION OF MOTION VECTOR PRECISION 有权

    公开(公告)号：US20240414356A1

    公开(公告)日：2024-12-12

    申请号：US18808958

    申请日：2024-08-19

    Applicant: Microsoft Technology Licensing, LLC

    Inventor： Gary J. Sullivan ,  You Zhou ,  Chih-Lung Lin

    IPC: H04N19/174 ,  H04N19/105 ,  H04N19/109 ,  H04N19/136 ,  H04N19/139 ,  H04N19/142 ,  H04N19/147 ,  H04N19/17 ,  H04N19/177 ,  H04N19/179 ,  H04N19/513 ,  H04N19/52 ,  H04N19/523

    Abstract: Approaches to selection of motion vector (“MV”) precision during video encoding are presented. These approaches can facilitate compression that is effective in terms of rate-distortion performance and/or computational efficiency. For example, a video encoder determines an MV precision for a unit of video from among multiple MV precisions, which include one or more fractional-sample MV precisions and integer-sample MV precision. The video encoder can identify a set of MV values having a fractional-sample MV precision, then select the MV precision for the unit based at least in part on prevalence of MV values (within the set) having a fractional part of zero. Or, the video encoder can perform rate-distortion analysis, where the rate-distortion analysis is biased towards the integer-sample MV precision. Or, the video encoder can collect information about the video and select the MV precision for the unit based at least in part on the collected information.

    CONSTRAINTS ON LOCATIONS OF REFERENCE BLOCKS FOR INTRA BLOCK COPY PREDICTION
    7.
    发明公开
    CONSTRAINTS ON LOCATIONS OF REFERENCE BLOCKS FOR INTRA BLOCK COPY PREDICTION 审中-公开

    公开(公告)号：US20230164331A1

    公开(公告)日：2023-05-25

    申请号：US18100639

    申请日：2023-01-24

    Applicant: Microsoft Technology Licensing, LLC

    Inventor： You Zhou ,  Chih-Lung Lin ,  Ming-Chieh Lee

    IPC: H04N19/176 ,  H04N19/105 ,  H04N19/593 ,  H04N19/103 ,  H04N19/139

    CPC classification number: H04N19/176 ,  H04N19/105 ,  H04N19/593 ,  H04N19/103 ,  H04N19/139

    Abstract: When encoding/decoding a current block of a current picture using intra block copy (“BC”) prediction, the location of a reference block is constrained so that it can be entirely within an inner search area of the current picture or entirely within an outer search area of the current picture, but cannot overlap both the inner search area and the outer search area. In some hardware-based implementations, on-chip memory buffers sample values of the inner search area, and off-chip memory buffers sample values of the outer search area. By enforcing this constraint on the location of the reference block, an encoder/decoder can avoid memory access operations that are split between on-chip memory and off-chip memory when retrieving the sample values of the reference block. At the same time, a reference block close to the current block may be used for intra BC prediction, helping compression efficiency.

    Constraints on locations of reference blocks for intra block copy prediction
    8.
    发明授权
    Constraints on locations of reference blocks for intra block copy prediction 有权

    公开(公告)号：US11595667B2

    公开(公告)日：2023-02-28

    申请号：US17198421

    申请日：2021-03-11

    Applicant: Microsoft Technology Licensing, LLC

    Inventor： You Zhou ,  Chih-Lung Lin ,  Ming-Chieh Lee

    IPC: H04N19/176 ,  H04N19/105 ,  H04N19/593 ,  H04N19/103 ,  H04N19/139

    Abstract: When encoding/decoding a current block of a current picture using intra block copy (“BC”) prediction, the location of a reference block is constrained so that it can be entirely within an inner search area of the current picture or entirely within an outer search area of the current picture, but cannot overlap both the inner search area and the outer search area. In some hardware-based implementations, on-chip memory buffers sample values of the inner search area, and off-chip memory buffers sample values of the outer search area. By enforcing this constraint on the location of the reference block, an encoder/decoder can avoid memory access operations that are split between on-chip memory and off-chip memory when retrieving the sample values of the reference block. At the same time, a reference block close to the current block may be used for intra BC prediction, helping compression efficiency.

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