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    Quantization for video encoding or decoding based on the surface of a block
    1.
    发明授权
    Quantization for video encoding or decoding based on the surface of a block 有权

    公开(公告)号：US11936868B2

    公开(公告)日：2024-03-19

    申请号：US17287740

    申请日：2019-10-21

    申请人： InterDigital VC Holdings, Inc.

    发明人： Philippe De Lagrange ,  Philippe Bordes ,  Edouard Francois

    IPC分类号： H04N19/124 ,  H04N19/176 ,  H04N19/186

    CPC分类号： H04N19/124 ,  H04N19/176 ,  H04N19/186

    摘要： An image is split into a plurality of blocks of various sizes and a subdivision level counter is associated to each of the blocks. The value of this subdivision level counter for a block is representative of the size of the block and is used to determine the quantization parameter for the block. The value is propagated for each subdivision and incremented according the type of the subdivision. When the image is split, an analysis is done according to the subdivision level counter, a maximal value of subdivision and the type of split, in order to determine the start of a new quantization group and when it is the case, the current position of the partition is propagated to the further split partitions to be stored with these partition and serve in the prediction process when decoding.

    QUANTIZATION FOR VIDEO ENCODING OR DECODING BASED ON THE SURFACE OF A BLOCK
    2.
    发明公开
    QUANTIZATION FOR VIDEO ENCODING OR DECODING BASED ON THE SURFACE OF A BLOCK 审中-公开

    公开(公告)号：US20240223761A1

    公开(公告)日：2024-07-04

    申请号：US18402004

    申请日：2024-01-02

    申请人： InterDigital VC Holdings, Inc.

    发明人： Philippe De Lagrange ,  Philippe Bordes ,  Edouard Francois

    IPC分类号： H04N19/124 ,  H04N19/176 ,  H04N19/186

    CPC分类号： H04N19/124 ,  H04N19/176 ,  H04N19/186

    摘要： An image is split into a plurality of blocks of various sizes and a subdivision level counter is associated to each of the blocks. The value of this subdivision level counter for a block is representative of the size of the block and is used to determine the quantization parameter for the block. The value is propagated for each subdivision and incremented according the type of the subdivision. When the image is split, an analysis is done according to the subdivision level counter, a maximal value of subdivision and the type of split, in order to determine the start of a new quantization group and when it is the case, the current position of the partition is propagated to the further split partitions to be stored with these partition and serve in the prediction process when decoding.

    Inverse mapping simplification
    6.
    发明授权
    Inverse mapping simplification 有权

    公开(公告)号：US11647188B2

    公开(公告)日：2023-05-09

    申请号：US17294166

    申请日：2019-12-16

    申请人： InterDigital VC Holdings, Inc.

    发明人： Edouard Francois ,  Christophe Chevance ,  Franck Hiron

    IPC分类号： H04N19/119 ,  H04N19/176 ,  H04N19/132 ,  H04N19/46

    CPC分类号： H04N19/119 ,  H04N19/132 ,  H04N19/176 ,  H04N19/46

    摘要： Reshaping can be used to better exploit the sample value distribution of video data. When reshaping is used inside the coding loop, forward mapping is applied to prediction signals from intra or inter prediction, and inverse mapping is applied to reconstructed signals. To simplify the inverse mapping operations, in one embodiment, the inverse mapping function is modelled as a piece-wise linear function, and each line segment is defined on an equi-distant interval of a length equal to a power of 2. In this embodiment, the inverse mapping function is specified by the number of pieces, initial offset value and the slope for each piece. In one example, the slope parameters can be signaled directly in the bitstream. In another example, an initial estimate of the slope parameters can be obtained from the forward mapping function, and the difference between the initial estimate and the actual parameters are signaled.