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    TEMPLATE MATCHING FUNCTION FOR BI-PREDICTIVE MV REFINEMENT
    2.
    发明申请
    TEMPLATE MATCHING FUNCTION FOR BI-PREDICTIVE MV REFINEMENT 审中-公开

    公开(公告)号：WO2019110132A1

    公开(公告)日：2019-06-13

    申请号：PCT/EP2017/082106

    申请日：2017-12-08

    Applicant: HUAWEI TECHNOLOGIES CO., LTD. ,  ESENLIK, Semih

    Inventor： ESENLIK, Semih ,  ZHAO, Zhijie ,  KOTRA, Anand, Meher ,  GAO, Han

    IPC: H04N19/56 ,  H04N19/513 ,  H04N19/44 ,  H04N19/61 ,  H04N19/577

    CPC classification number: H04N19/61 ,  H04N19/44 ,  H04N19/51 ,  H04N19/513 ,  H04N19/56 ,  H04N19/577

    Abstract: The present disclosure relates to motion vector determination based on template matching for bi-directional motion vector estimation. In particular, a block template is constructed as an average of blocks pointed to by initial motion vectors to be refined. Then, the motion vector refinement is performed by template matching in two different reference pictures. The matching is performed by finding an optimum (minimum or maximum, depending on the function) of a matching function corresponding to the best matching block in each of the two reference pictures. The optimum is searched for zero-mean template and a zero-mean candidate block (among the block positions pointed to by the motion vector candidates of the search space). In other words, before performing the function optimization, a mean of the template is subtracted from the template and a mean of the candidate block is subtracted from the candidate block. The predictor of the current block is then calculated as a weighted average of these best matching blocks in the respective reference pictures.

    MOTION VECTOR REFINEMENT FOR MULTI-REFERENCE PREDICTION
    4.
    发明申请
    MOTION VECTOR REFINEMENT FOR MULTI-REFERENCE PREDICTION 审中-公开

    公开(公告)号：WO2019001741A1

    公开(公告)日：2019-01-03

    申请号：PCT/EP2017/066342

    申请日：2017-06-30

    Applicant: HUAWEI TECHNOLOGIES CO., LTD. ,  ESENLIK, Semih

    Inventor： ESENLIK, Semih ,  KOTRA, Anand, Meher ,  ZHAO, Zhijie

    IPC: H04N19/513 ,  H04N19/533 ,  H04N19/573

    Abstract: The present invention relates to the performance of motion vector refinement in a search space for multi-reference inter-prediction. Two or more reference pictures are selected, one of those used for motion vector refinement. Based on an initial estimate of a motion vector to the reference picture for motion vector refinement, a search space in this reference image is constructed. Using template matching, the first motion vector is refined. The second motion vector to another reference picture is calculated using its initial estimate, the initial estimate of the first motion vector and the refined first motion vector.

    SEARCH REGION FOR MOTION VECTOR REFINEMENT
    5.
    发明申请
    SEARCH REGION FOR MOTION VECTOR REFINEMENT 审中-公开

    公开(公告)号：WO2019001737A1

    公开(公告)日：2019-01-03

    申请号：PCT/EP2017/066337

    申请日：2017-06-30

    Applicant: HUAWEI TECHNOLOGIES CO., LTD. ,  ESENLIK, Semih

    Inventor： ESENLIK, Semih ,  KOTRA, Anand, Meher ,  ZHAO, Zhijie ,  GAO, Han

    IPC: H04N19/56 ,  H04N19/46 ,  H04N19/51

    Abstract: The present invention relates to the construction of a search space for determining a motion vector for a current block of a picture in a video sequence. The search space construction is split into in two main stages, wherein a first and a second partial search space are respectively determined. Based on an initial estimate of a motion vector, a first search space is first constructed. A first and a second candidate motion of the first search space are identified according to a cost function. Based on the first and the second candidate motion vectors, a second search space is constructed. The motion vector for the current block is selected from the candidate motion vectors of the first search space and the second search space.

    MEMORY ACCESS WINDOW AND PADDING FOR MOTION VECTOR REFINEMENT
    10.
    发明申请
    MEMORY ACCESS WINDOW AND PADDING FOR MOTION VECTOR REFINEMENT 审中-公开

    公开(公告)号：WO2019072370A1

    公开(公告)日：2019-04-18

    申请号：PCT/EP2017/075712

    申请日：2017-10-09

    Applicant: HUAWEI TECHNOLOGIES CO., LTD. ,  ESENLIK, Semih

    Inventor： ESENLIK, Semih ,  ZHAO, Zhijie ,  GAO, Han ,  KOTRA, Anand, Meher

    IPC: H04N19/57 ,  H04N19/563 ,  H04N19/56 ,  H04N19/513 ,  H04N19/533 ,  H04N19/573 ,  H04N19/52

    Abstract: The present disclosure relates to motion vector determination using template matching. In particular, an initial motion vector and a template are obtained for a prediction block. Then a refinement of the initial motion vector is determined by template matching with said template in a search space. The search space is located on a position given by the initial motion vector. The template matching accesses integer sample positions within a predetermined window, the predetermined window including said search space and further integer sample positions accessible for the template matching, replaces at least one integer sample position located out of the window by a replacement value which is based on at least one sample within said window, and uses the accessed integer sample position values as well as the replacement values to perform the template matching.

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