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    Method and apparatus for encoding and decoding image by using rotational transform
    52.
    发明授权
    Method and apparatus for encoding and decoding image by using rotational transform 有权
    通过使用旋转变换对图像进行编码和解码的方法和装置

    公开(公告)号：US08929673B2

    公开(公告)日：2015-01-06

    申请号：US13920711

    申请日：2013-06-18

    Applicant: Samsung Electronics Co., Ltd.

    Inventor： Elena Alshina ,  Alexander Alshin ,  Vadim Seregin

    IPC: G06K9/36 ,  H04N19/625 ,  H04N19/119 ,  H04N19/14 ,  H04N19/18 ,  H04N19/122 ,  H04N19/176 ,  H04N19/61

    CPC classification number: H04N19/625 ,  H04N19/119 ,  H04N19/122 ,  H04N19/14 ,  H04N19/176 ,  H04N19/18 ,  H04N19/61

    Abstract: An image encoding method includes generating a first frequency coefficient matrix by transforming a predetermined block to a frequency domain; determining whether the first frequency coefficient matrix includes coefficients whose absolute values are greater than a predetermined value; generating a second frequency coefficient matrix by selectively partially switching at least one of rows and columns of the first frequency coefficient matrix according to an angle parameter based on a determination result; and selectively encoding the second frequency coefficient matrix based on the determination result.

    Abstract translation: 图像编码方法包括：通过将预定块变换为频域来生成第一频率系数矩阵; 确定第一频率系数矩阵是否包括其绝对值大于预定值的系数; 通过基于确定结果，根据角度参数选择性地部分地切换第一频率系数矩阵的行和列中的至少一个来产生第二频率系数矩阵; 以及基于所述确定结果选择性地编码所述第二频率系数矩阵。

    INVERSE TRANSFORMATION METHOD FOR CLIPPING DATA OF INVERSE QUANTIZATION, INVERSE TRANSFORMATION DURING VIDEO DECODING STEP, AND DEVICE THEREFOR
    53.
    发明申请
    INVERSE TRANSFORMATION METHOD FOR CLIPPING DATA OF INVERSE QUANTIZATION, INVERSE TRANSFORMATION DURING VIDEO DECODING STEP, AND DEVICE THEREFOR 审中-公开
    逆变换数据逆变换方法，视频解码步骤中的逆变换及其设备

    公开(公告)号：US20140301450A1

    公开(公告)日：2014-10-09

    申请号：US14356679

    申请日：2012-11-07

    Applicant: Samsung Electronics Co., Ltd.

    Inventor： Elena Alshina ,  Alexander Alshin

    IPC: H04N19/12 ,  H04N19/18 ,  H04N19/196

    CPC classification number: H04N19/60 ,  H04N19/124 ,  H04N19/132 ,  H04N19/157 ,  H04N19/176

    Abstract: Provided are video encoding and video decoding for performing clipping on data during inverse quantization and inverse transformation according to blocks. An inverse transformation method includes: receiving quantized transformation coefficients of a current block; clipping transformation coefficients generated by inverse-quantizing the quantized transformation coefficients to a range of a first maximum value and a first minimum value that are determined based on a size of the current block; clipping intermediate data generated by performing first inverse transformation on the clipped transformation coefficients by using a first inverse transformation matrix to a range of a second maximum value and a second minimum value that are determined based on the size of the current block and in internal bit depth; and performing second inverse transformation on the clipped intermediate data by using a second inverse transformation matrix.

    Abstract translation: 提供了用于根据块在逆量化和逆变换期间对数据进行限幅的视频编码和视频解码。 逆变换方法包括：接收当前块的量化变换系数; 通过将量化的变换系数逆量化到基于当前块的大小确定的第一最大值和第一最小值的范围而产生的削波变换系数; 通过使用第一逆变换矩阵到基于当前块的大小和内部位深度确定的第二最大值和第二最小值的范围来对剪切变换系数执行第一逆变换而生成的中间数据 ; 以及通过使用第二逆变换矩阵对所述经剪切的中间数据执行第二逆变换。

    Video decoding method and apparatus and video encoding method and apparatus
    57.
    发明授权
    Video decoding method and apparatus and video encoding method and apparatus 有权

    公开(公告)号：US11582476B2

    公开(公告)日：2023-02-14

    申请号：US17317331

    申请日：2021-05-11

    Applicant: SAMSUNG ELECTRONICS CO., LTD.

    Inventor： Alexander Alshin ,  Elena Alshina

    IPC: H04N19/513 ,  H04N19/105 ,  H04N19/139 ,  H04N19/159 ,  H04N19/176

    Abstract: Provided is a video decoding method including determining a displacement vector per unit time of pixels of a current block in a horizontal direction or a vertical direction, the pixels including a pixel adjacent to an inside of a boundary of the current block, by using values about reference pixels included in a first reference block and a second reference block, without using a stored value about a pixel located outside boundaries of the first reference block and the second reference block; and obtaining a prediction block of the current block by performing block-unit motion compensation and pixel group unit motion compensation on the current block by using a gradient value in the horizontal direction or the vertical direction of a first corresponding reference pixel in the first reference block which corresponds to a current pixel included in a current pixel group in the current block, a gradient value in the horizontal direction or the vertical direction of a second corresponding reference pixel in the second reference block which corresponds to the current pixel, a pixel value of the first corresponding reference pixel, a pixel value of the second corresponding reference pixel, and a displacement vector per unit time of the current pixel in the horizontal direction or the vertical direction. In this regard, the current pixel group may include at least one pixel.

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