公开(公告)号：US20220030239A1

公开(公告)日：2022-01-27

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

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.

公开(公告)号：US20210407140A1

公开(公告)日：2021-12-30

申请号：US17292215

申请日：2019-11-06

Applicant: FONDATION B-COM

Inventor： Félix Henry ,  Gordon Clare ,  Pierrick Philippe

IPC: G06T9/00 ,  H03M7/36 ,  H03M7/30

Abstract: A method for decoding at least one encoded image within an encoded data stream, the image being split into blocks of elements. The decoding method includes: obtaining from the stream a piece of information representative of a so-called prediction function, the prediction function belonging to a predetermined list of prediction functions; and decoding at least one element of a block of elements, using a differential pulse-code modulation, from an already processed neighbouring element and using the prediction function.

公开(公告)号：US20210136375A1

公开(公告)日：2021-05-06

申请号：US16638644

申请日：2018-07-25

Applicant: B<>COM

Inventor： Victorien Lorcy ,  Pierrick Philippe

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

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.

公开(公告)号：US10924737B2

公开(公告)日：2021-02-16

申请号：US15740198

申请日：2016-06-16

Applicant: B<>COM

Inventor： Pierrick Philippe

IPC: H04N19/44 ,  H04N19/96 ,  H04N19/52 ,  H04N19/625 ,  H04N19/593 ,  H04N19/61 ,  H04N19/124 ,  H04N19/18 ,  H04N19/12 ,  H04N19/463 ,  H04N19/14 ,  H04N19/176

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.