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    Method and device for coding and decoding an image by block cutting into zones
    1.
    发明申请
    Method and device for coding and decoding an image by block cutting into zones 有权

    公开(公告)号：US20210392320A1

    公开(公告)日：2021-12-16

    申请号：US17291813

    申请日：2019-11-06

    Applicant: FONDATION B-COM

    Inventor： Félix Henry ,  Gordon Clare ,  Pierrick Philippe

    IPC: H04N19/105 ,  H04N19/176 ,  H04N19/119 ,  H04N19/167 ,  H04N19/593 ,  H04N19/159

    Abstract: A method for encoding or decoding at least one image, an image being split into blocks of elements. The method includes, for at least one block: splitting the block into at least two areas; and processing at least one of the areas. The processing includes scanning the elements of the area according to a predetermined scanning order, and for at least one scanned element, called a current element: selecting at least one predictor element previously encoded or decoded according to a prediction function; and predicting the current element: from the at least one predictor element, if the at least one predictor element belongs to the area; or from at least one replacement value, otherwise.

    Image decoding method, encoding method, devices, terminal equipment and computer programs therefor
    2.
    发明授权
    Image decoding method, encoding method, devices, terminal equipment and computer programs therefor 有权

    公开(公告)号：US11159794B2

    公开(公告)日：2021-10-26

    申请号：US16638644

    申请日：2018-07-25

    Applicant: FONDATION B-COM

    Inventor： Victorien Lorcy ,  Pierrick Philippe

    IPC: H04N19/12 ,  H04N19/119 ,  H04N19/176 ,  H04N19/60

    Abstract: A method for decoding a digital image from encoded data representative of the image. The image is divided into blocks processed in a defined order. The method includes, for a current block having a predetermined number (Mv) of lines and number (Mh) of columns: decoding coefficients of the current block from coded data; decoding an index representative of an identifier of a transform among a plurality of transforms and identifying the transform, a transform being expressed as a vertical subtransform of size Mv*Mv and a horizontal subtransform of size Mh*Mh; transforming the current block into a decoded block transformed, from the transform obtained, by successive application of the vertical subtransform and then the horizontal subtransform or respectively of the horizontal subtransform and then the vertical subtransform; and reconstructing the image from the transformed decoded block. The transforming includes: a modified use of core sub-transform coefficients, their absolute values being retained.

    METHOD FOR ENCODING A DIGITAL IMAGE, DECODING METHOD, DEVICES, AND ASSOCIATED COMPUTER PROGRAMS
    5.
    发明申请
    METHOD FOR ENCODING A DIGITAL IMAGE, DECODING METHOD, DEVICES, AND ASSOCIATED COMPUTER PROGRAMS 有权

    公开(公告)号：US20210136382A1

    公开(公告)日：2021-05-06

    申请号：US17147833

    申请日：2021-01-13

    Applicant: B<>COM

    Inventor： Pierrick Philippe

    IPC: H04N19/124 ,  H04N19/61 ,  H04N19/18 ,  H04N19/12 ,  H04N19/463 ,  H04N19/14 ,  H04N19/176 ,  H04N19/625

    Abstract: Encoding a digital image divided into a plurality of blocks of pixels processed in a defined order, including the following steps, implemented for a current block, with preset sizes: predicting values of the current block from at least one block previously processed; calculating a residual block by subtracting the predicted values from the original values of the current block; obtaining a residual block by applying a transform to pixels of the residual block, said transformed residual block comprising coefficients; encoding the transformed residual block; calculating at least one characteristic representative of at least one transformed residual coefficient of the current block; determining initial identification data representative of a sub-list of at least one transform associated with said at least one calculated characteristic; and verifying that the transform applied to the current block is part of the sub-list identified by the initial data.

    A METHOD FOR ENCODING A DIGITAL IMAGE, DECODING METHOD, DEVICES, AND ASSOCIATED COMPUTER PROGRAMS
    7.
    发明申请
    A METHOD FOR ENCODING A DIGITAL IMAGE, DECODING METHOD, DEVICES, AND ASSOCIATED COMPUTER PROGRAMS 审中-公开

    公开(公告)号：US20180199037A1

    公开(公告)日：2018-07-12

    申请号：US15740198

    申请日：2016-06-16

    Applicant: B<>COM ,  Orange

    Inventor： Pierrick Philippe

    IPC: H04N19/124 ,  H04N19/61 ,  H04N19/625 ,  H04N19/176

    CPC classification number: H04N19/124 ,  H04N19/12 ,  H04N19/14 ,  H04N19/176 ,  H04N19/18 ,  H04N19/463 ,  H04N19/61 ,  H04N19/625

    Abstract: Encoding a digital image divided into a plurality of blocks of pixels processed in a defined order, including the following steps, implemented for a current block, with preset sizes: predicting values of the current block from at least one block previously processed; calculating a residual block by subtracting the predicted values from the original values of the current block; obtaining a residual block by applying a transform to pixels of the residual block, said transformed residual block comprising coefficients; encoding the transformed residual block; calculating at least one characteristic representative of at least one transformed residual coefficient of the current block; determining initial identification data representative of a sub-list of at least one transform associated with said at least one calculated characteristic; and verifying that the transform applied to the current block is part of the sub-list identified by the initial data.

    METHOD FOR ENCODING A DIGITAL IMAGE, DECODING METHOD, DEVICES, AND ASSOCIATED COMPUTER PROGRAMMES
    8.
    发明申请
    METHOD FOR ENCODING A DIGITAL IMAGE, DECODING METHOD, DEVICES, AND ASSOCIATED COMPUTER PROGRAMMES 审中-公开

    公开(公告)号：US20180020216A1

    公开(公告)日：2018-01-18

    申请号：US15549298

    申请日：2016-02-05

    Applicant: B<>COM ,  Orange

    Inventor： Pierrick Philippe

    IPC: H04N19/122 ,  H04N19/157 ,  H04N19/124 ,  H04N19/18 ,  H04N19/61 ,  H04N19/96 ,  H04N19/176

    CPC classification number: H04N19/122 ,  H04N19/124 ,  H04N19/157 ,  H04N19/176 ,  H04N19/18 ,  H04N19/61 ,  H04N19/96

    Abstract: An encoding method encodes a digital image that is divided into a plurality of blocks of pixels processed in a defined order. The method includes: transforming the current block into a transformed block with coefficients, by implementing two successive transformation sub-steps, one to the current block and the other to an intermediate block, resulting from the first sub-step; and quantizing and encoding the coefficients of the transformed block. The transforming step further comprises, a preliminary sub-step of forming at least one first and one second distinct vector, in the block to be transformed, each vector comprising the pixels, respectively the coefficients of a sequence of pixels, respectively adjacent coefficients of the block to be transformed, of length equal to one of the sizes of the block to be transformed. The transformation sub-step also includes applying a first transform to the first vector and a second transform to the second vector.

    Image decoding method, encoding method, devices, terminal equipment and computer programs therefor
    9.
    发明授权
    Image decoding method, encoding method, devices, terminal equipment and computer programs therefor 有权

    公开(公告)号：US11736694B2

    公开(公告)日：2023-08-22

    申请号：US17494299

    申请日：2021-10-05

    Applicant: FONDATION B-COM

    Inventor： Victorien Lorcy ,  Pierrick Philippe

    IPC: H04N19/12 ,  H04N19/119 ,  H04N19/176 ,  H04N19/60

    CPC classification number: H04N19/12 ,  H04N19/119 ,  H04N19/176 ,  H04N19/60

    Abstract: A method for decoding a digital image from encoded data representative of the image. The image is divided into blocks processed in a defined order. The method includes, for a current block having a predetermined number (Mv) of lines and number (Mh) of columns: decoding coefficients of the current block from coded data; decoding an index representative of an identifier of a transform among a plurality of transforms and identifying the transform, a transform being expressed as a vertical subtransform of size Mv*Mv and a horizontal subtransform of size Mh*Mh; transforming the current block into a decoded block transformed, from the transform obtained, by successive application of the vertical subtransform and then the horizontal subtransform or respectively of the horizontal subtransform and then the vertical subtransform; and reconstructing the image from the transformed decoded block. The transforming includes: a modified use of core sub-transform coefficients, their absolute values being retained.

    Method for encoding a digital image, decoding method, devices, and associated computer programs
    10.
    发明授权
    Method for encoding a digital image, decoding method, devices, and associated computer programs 有权

    公开(公告)号：US11451777B2

    公开(公告)日：2022-09-20

    申请号：US17147833

    申请日：2021-01-13

    Applicant: B<>COM

    Inventor： Pierrick Philippe

    IPC: H04N19/124 ,  H04N19/12 ,  H04N19/14 ,  H04N19/176 ,  H04N19/18 ,  H04N19/463 ,  H04N19/61 ,  H04N19/625

    Abstract: Encoding a digital image divided into a plurality of blocks of pixels processed in a defined order, including the following steps, implemented for a current block, with preset sizes: predicting values of the current block from at least one block previously processed; calculating a residual block by subtracting the predicted values from the original values of the current block; obtaining a residual block by applying a transform to pixels of the residual block, said transformed residual block comprising coefficients; encoding the transformed residual block; calculating at least one characteristic representative of at least one transformed residual coefficient of the current block; determining initial identification data representative of a sub-list of at least one transform associated with said at least one calculated characteristic; and verifying that the transform applied to the current block is part of the sub-list identified by the initial data.

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