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.

公开(公告)号：US10965504B2

公开(公告)日：2021-03-30

申请号：US16307053

申请日：2017-05-16

Applicant: B-COM

Inventor： Stephane Paquelet ,  Patrick Savelli

IPC: H04L25/49 ,  H04B1/717 ,  H04L27/26 ,  H04B1/69

Abstract: A method for generating a pulse-position-modulated signal. The signal includes a temporal succession of waveforms among Ns waveforms obtained by time shift that is an integer multiple of an elementary time duration Tc. The method includes the following steps executed for a k rank symbol among Ns symbols: obtaining, a set of N modulation coefficients cl(k), a modulation coefficient of index n, cn(k), being expressed as the product of a reference modulation coefficient cn(r) coming from the Fourier series decomposition of a reference waveform associated with a symbol of rank r multiplied by a phase shift term the argument of which is proportional to n; and generating M temporal samples of a k-th waveform carrying the symbol of rank k by Fourier transformation of said set of N modulation coefficients cl(k).

公开(公告)号：US10958901B2

公开(公告)日：2021-03-23

申请号：US16300691

申请日：2017-04-27

Applicant: B-COM

Inventor： Felix Henry ,  Joel Jung ,  Charlene Mouton

IPC: H04N19/107 ,  H04N19/176 ,  H04N19/11 ,  H04N19/119 ,  H04N19/184 ,  G06K9/62

Abstract: A method of decoding an encoded data stream representing at least one image subdivided into blocks. The method includes, for a current block of the image, and for each of at least two prediction modes available to predict the current block, obtaining a predictive block associated with the available mode; building a list having at least one of the available modes; for at least one mode included in the list, called a current mode, determining a distance measurement between the predictive block associated with the current mode and the other predictive blocks associated with the other available modes and obtained for the current block; modifying the list modified as a function of the determined measurement; decoding information identifying, for the current block, a prediction mode from the modified list from the encoded data stream; and rebuilding the current block from the predictive block associated with the identified prediction mode.

公开(公告)号：US20210058582A1

公开(公告)日：2021-02-25

申请号：US16961735

申请日：2019-07-26

Applicant: FONDATION B-COM

Inventor： Jean-Yves AUBIE ,  Wassim HAMIDOUCHE ,  Patrick DUMENIL ,  Glenn HERROU

IPC: H04N7/01

Abstract: A method for forming an image sequence that is an output sequence, from an input image sequence, is provided. The input image sequence has an input spatial resolution and an input temporal resolution. The output sequence has an output temporal resolution equal to the input temporal resolution and an output spatial resolution equal to a predetermined fraction 1/N of the input spatial resolution by an integer number N higher than or equal to 2. The method, implemented for a sub-sequence of the input frame sequence that is a current input sub-sequence and including a preset number of images, includes: obtaining a temporal frequency that is an image frequency, associated with the current input sub-sequence; processing the current input sub-sequence to obtain an output sub-sequence; and inserting the output sub-sequence and the associated image frequency into an output container.

公开(公告)号：US10805638B2

公开(公告)日：2020-10-13

申请号：US16338878

申请日：2017-09-12

Applicant: B<>COM

Inventor： Felix Henry ,  Gordon Clare

IPC: H04N19/61 ,  H04N19/513

Abstract: A method for coding a digital image divided into blocks. The method includes, for a current block: processing the current block to provide a vector of transformed coefficients; selecting a sequence of M signs of coefficients to be predicted in the coefficient vector, M being an integer greater than or equal to 2; predicting values of the signs from a plurality of assumptions of combinations and a cost function; and for a sign of the sequence, coding an indicator representing a difference between its actual value and its predicted value. The predicting includes, for at least one second, current assumption: obtaining a pixel vector associated with the current assumption, by linear combination of at least one pixel vector associated with a first assumption and at least one pattern vector obtained from the vector of transformed coefficients; an calculating the cost function for the current assumption from the pixel vector obtained.

公开(公告)号：US20200162398A1

公开(公告)日：2020-05-21

申请号：US15779725

申请日：2016-11-16

Applicant: Orange ,  B-COM

Inventor： William David Diego Maza ,  Isabelle Hamchaoui ,  Fabrice Guillemin

IPC: H04L12/863

Abstract: A method is proposed for processing of data packets received by an upstream node and intended for transmission to a terminal by a downstream node. The upstream node includes a queue of non-priority data packets intended for the terminal. The method includes: obtaining a first piece of information representing a filling state of the above-mentioned queue over a predetermined period of observation; when the first piece of information obtained has a value indicating a filling level of the queue that is lower than or equal to a first predetermined non-zero low threshold, reducing a rate of departure from the queue; when the first piece of obtained information has a value indicating a filling level of the queue that is higher than a first predetermined high threshold higher than or equal to the first low threshold, increasing the rate of departure from the queue.

公开(公告)号：US10374681B2

公开(公告)日：2019-08-06

申请号：US15748428

申请日：2016-07-19

Applicant: B<>COM

Inventor： Stephane Paquelet ,  Remi Bonnefoi

IPC: H04B7/06 ,  H04B17/336 ,  H04B7/0413

Abstract: A method for processing information representative of a transmission channel between a radio transmitter and a radio receiver. The information includes a matrix representative of the transmission channel. The method includes obtaining at least one pair of eigencharacteristics of the product of the conjugate transpose of the channel matrix with the channel matrix, consisting of non-zero eigenvalues; obtaining a measurement of a signal to noise ratio in the transmission channel; calculating at least one eigenvalue of an autocorrelation matrix of the symbols on transmission, according to a criterion of maximizing a capacity of the transmission channel, from the eigenvalues obtained; and transmitting to the radio transmitter information representative of the at least one calculated non-zero eigenvalue associated with the eigenvector.

公开(公告)号：US20190158878A1

公开(公告)日：2019-05-23

申请号：US16092359

申请日：2017-04-05

Applicant: B<>COM

Inventor： Pierrick Philippe ,  Victorien Lorcy ,  Pierre Castel

IPC: H04N19/625 ,  H04N19/184 ,  H04N19/119

CPC classification number: H04N19/625 ,  H04N19/119 ,  H04N19/122 ,  H04N19/147 ,  H04N19/176 ,  H04N19/184

Abstract: A method for decoding a current block of a digital image. The method includes: decoding coefficients of the current block; and transforming the current block into a decoded block, by implementing a first sub step to produce an intermediate block, that applies to the column and row vectors of the current block, and a second substep to produce a block of pixels that applies to the row and column vectors of the intermediate block, resulting from the first substep; and rebuilding the image from the decoded block. At least one of the first and second substeps includes, for an input row or column vector: forming a first subvector of size K

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.

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.