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    Encoder, decoder, encoding method, and decoding method
    172.
    发明授权
    Encoder, decoder, encoding method, and decoding method 有权

    公开(公告)号：US11206402B2

    公开(公告)日：2021-12-21

    申请号：US17125113

    申请日：2020-12-17

    Applicant: Panasonic Intellectual Property Corporation of America

    Inventor： Kiyofumi Abe ,  Takahiro Nishi ,  Tadamasa Toma ,  Yusuke Kato

    IPC: H04N19/13 ,  H04N19/70 ,  H04N19/176 ,  H04L29/06 ,  H04N19/184

    Abstract: An encoder includes memory and circuitry which: (i) encodes an image block; (ii) when encoding the image block: binarizes coefficient information indicating coefficients of the image block; and controls whether to apply arithmetic encoding to a binary data string obtained by binarizing the coefficient information; and (iii) when binarizing the coefficient information: binarizes the coefficient information according to a first syntax structure when arithmetic encoding is applied to the data string and a predetermined condition is not satisfied; binarizes the coefficient information according to a second syntax structure when arithmetic encoding is applied to the data string and the predetermined condition is satisfied; binarizes the coefficient information according to the second syntax structure when no arithmetic encoding is applied to the data string; and subtracts 1 from a value of an initial non-zero coefficient when no arithmetic encoding is applied to the data string when encoding the image block.

    Encoder, decoder, encoding method, and decoding method
    174.
    发明授权
    Encoder, decoder, encoding method, and decoding method 有权

    公开(公告)号：US11153596B2

    公开(公告)日：2021-10-19

    申请号：US16696249

    申请日：2019-11-26

    Applicant: Panasonic Intellectual Property Corporation of America

    Inventor： Ryuichi Kanoh ,  Tadamasa Toma ,  Takahiro Nishi ,  Kiyofumi Abe ,  Takashi Hashimoto

    IPC: H04N19/52 ,  H04N19/105 ,  H04N19/159 ,  H04N19/176 ,  H04N19/186

    Abstract: Provided is an encoder that achieves further improvement. The encoder includes processing circuitry and memory. Using the memory, the processing circuitry: obtains two prediction images from two reference pictures; derives a luminance gradient value of each pixel position in each of the two prediction images; derives a luminance local motion estimation value of each pixel position in a current block; generates a luminance final prediction image using a luminance value and the luminance gradient value in each of the two prediction images, and the luminance local motion estimation value of the current block; and generates a chrominance final prediction image using at least one of the luminance gradient value of each of the two prediction images or the luminance local motion estimation value of the current block, and chrominance of each of the two prediction images.

    Encoder, decoder, encoding method, and decoding method
    176.
    发明授权
    Encoder, decoder, encoding method, and decoding method 有权

    公开(公告)号：US11134260B2

    公开(公告)日：2021-09-28

    申请号：US16860367

    申请日：2020-04-28

    Applicant: Panasonic Intellectual Property Corporation of America

    Inventor： Takashi Hashimoto ,  Kiyofumi Abe ,  Tadamasa Toma ,  Takahiro Nishi ,  Ryuichi Kanoh

    IPC: H04N19/51 ,  H04N19/433

    Abstract: An encoder that encodes a picture to generate a coded stream includes: circuitry and a memory coupled to the circuitry. The circuitry performs, using the memory: generating a prediction image of a current block included in a current picture by referring to a first region included in a reference picture different from the current picture; operating a bi-directional optical flow process to correct the prediction image by referring to a second region included in the first region, and not operating the bi-directional optical flow process in response to the second region not being included in the first region; and encoding the current block based on the prediction image.

    Encoder, decoder, encoding method, and decoding method
    178.
    发明授权
    Encoder, decoder, encoding method, and decoding method 有权

    公开(公告)号：US11128883B2

    公开(公告)日：2021-09-21

    申请号：US16799315

    申请日：2020-02-24

    Applicant: Panasonic Intellectual Property Corporation of America

    Inventor： Tadamasa Toma ,  Takahiro Nishi ,  Kiyofumi Abe ,  Ryuichi Kanoh

    IPC: H04N19/52 ,  H04N19/157 ,  H04N19/176 ,  H04N19/182 ,  H04N19/59

    Abstract: Provided is an encoder includes: circuitry; and memory, in which the circuitry: determines which mode is used to perform a prediction process, among modes including a first mode in which the prediction process is performed based on a motion vector of each block in a video and a second mode in which the prediction process is performed based on a motion vector of each sub-block obtained by splitting the block; when the prediction process is performed in the first mode, determines whether to perform a correction process on a prediction image using a spatial gradient of pixel values in the prediction image obtained by performing the prediction process, and performs the correction process when it is determined to perform the correction process; and when the prediction process is performed in the second mode, does not perform the correction process.

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