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    METHOD AND APPARATUS FOR VIDEO ENCODING AND DECODING BASED ON ADAPTIVE COEFFICIENT GROUP
    2.
    发明申请
    METHOD AND APPARATUS FOR VIDEO ENCODING AND DECODING BASED ON ADAPTIVE COEFFICIENT GROUP 有权

    公开(公告)号：US20210274196A1

    公开(公告)日：2021-09-02

    申请号：US17255663

    申请日：2019-06-28

    Applicant: InterDigital VC Holdings, Inc.

    Inventor： Fabrice LeLeannec ,  Tang POIRER ,  Ya CHEN

    IPC: H04N19/18 ,  H04N19/147 ,  H04N19/176 ,  H04N19/70 ,  H04N19/14

    Abstract: Various implementations for video encoding and decoding are presented involving determining, for a block being encoded or decoded in a picture, a coefficient group mode for coding at least one coefficient of a set of transform coefficients of the image block; encoding or decoding the set of transform coefficients of the image block responsive to the coefficient group mode. The coefficient group mode can be determined from at least one of image block size, number of non-zero transform coefficients inside the image block, position of a transform coefficient inside the image block, decoded syntax element, wherein the coefficient group mode can specify whether a coefficient group significance flag is coded/decoded, indicating that at least one coefficient is non-zero inside a coefficient group and/or specify at least one size of the coefficient group.

    A METHOD AND A DEVICE FOR PICTURE ENCODING AND DECODING
    5.
    发明申请
    A METHOD AND A DEVICE FOR PICTURE ENCODING AND DECODING 审中-公开

    公开(公告)号：US20200169730A1

    公开(公告)日：2020-05-28

    申请号：US16618564

    申请日：2018-05-17

    Applicant: INTERDIGITAL VC HOLDINGS, INC.

    Inventor： Philippe BORDES ,  Fabien RACAPE ,  Ya CHEN

    IPC: H04N19/117 ,  H04N19/147 ,  H04N19/176 ,  H04N19/70

    Abstract: An encoding method for encoding blocks of a picture part is disclosed in an embodiment. A reconstructed version of each block of the picture part, called reconstructed block, is determined. A plurality of candidate sets of filter parameters is obtained and an index is determined for each block of the picture part that identifies one of the candidate sets of filter parameters to be used for filtering the block. Each reconstructed block is filtered with the candidate set of filter parameters of the plurality of candidate sets of filter parameters identified by the index. The plurality of candidate sets of filter parameters, the blocks of the picture part and the index for each block are encoded in a bitstream. Advantageously, a plurality of candidate sets of filter parameters are determined such as to minimize a rate-distortion cost for each block of the picture part. For each block of the picture part, an index is determined that identifies one of the plurality of candidate sets of filter parameters to be used for filtering the block such as to minimize a rate-distortion cost for the block. The filter parameters of each candidate set of the plurality of candidate sets are refined using the reconstructed version of the blocks whose index identifies the candidate set.

    SCALAR QUANTIZER DECISION SCHEME FOR DEPENDENT SCALAR QUANTIZATION
    9.
    发明申请
    SCALAR QUANTIZER DECISION SCHEME FOR DEPENDENT SCALAR QUANTIZATION 有权

    公开(公告)号：US20240373015A1

    公开(公告)日：2024-11-07

    申请号：US18773544

    申请日：2024-07-15

    Applicant: InterDigital VC Holdings, Inc.

    Inventor： Ya CHEN ,  Fabrice LELEANNEC ,  Tangi POIRIER ,  Philippe DE LAGRANGE

    IPC: H04N19/124 ,  H04N19/176 ,  H04N19/18 ,  H04N19/42 ,  H04N19/46 ,  H04N19/48 ,  H04N19/70 ,  H04N19/91

    Abstract: When dependent scalar quantization is used, the choice of the quantizer depends on the decoding of the preceding transform coefficient, and the entropy decoding of a transform coefficient depends on quantizer choice. To maintain high throughput in hardware implementations for transform coefficient entropy coding, several decision schemes of the scaler quantizer are proposed. In one implementation, the state transition and the context model selection are based on only regular coded bins. For example, the state transition can be based on the sum of the SIG, gt1 and gt2 flags, the exclusive-or function of the SIG, gt1 and gt2 flags, or based on only the gt1 or gt2 flag. When a block of transform coefficients is coded, the regular mode bins can be coded first in one or more scan passes, and the remaining bypass coded bins are grouped together in another one or more scan passes.

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