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：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：US20250047337A1

公开(公告)日：2025-02-06

申请号：US18720479

申请日：2022-12-06

Applicant: FONDATION B-COM

Inventor： Luc LE MAGOAROU ,  Stéphane PAQUELET

IPC: H04B7/0456

Abstract: The present invention relates to a method for determining pre-coding weights (w) based on a position vector (I) representing the position of a communication terminal within a communication system, said method being implemented by way of an artificial neural network (NN), the method comprising a step of determining the pre-coding weights (w) by way of the artificial neural network (NN) receiving the position vector (I) at input and supplying the pre-coding weights (w) at output. A transmission method, a device for determining pre-coding weights, a transmission device and a computer program are also described.

公开(公告)号：US12197171B2

公开(公告)日：2025-01-14

申请号：US17601323

申请日：2020-03-30

Applicant: FONDATION B-COM

Inventor： Patrick Gioia ,  Antonin Gilles

IPC: G03H1/22

Abstract: Disclosed is a method for constructing a digital hologram to be displayed by of a display system. The display system includes a light modulator producing a light beam and a convergent optical device designed to make the light beam converge towards a focal point. The scene is defined by a set of luminous elements. The construction method includes a step of determining values respectively associated with the pixels of the digital hologram by summing the light contributions respectively produced by the luminous elements with weighting, for each of the light contributions, by a correction coefficient depending on the area of the intersection of a surface between the convergent optical device and the focal point, and a pencil of light having a predetermined angular opening and transmitted through the convergent optical device from the luminous element producing the light contribution concerned. An associated holographic system is also described.

公开(公告)号：US12099329B2

公开(公告)日：2024-09-24

申请号：US17050214

申请日：2019-03-20

Applicant: FONDATION B-COM

Inventor： Patrick Gioia ,  Antonin Gilles

IPC: G03H1/22 ,  G03H1/08 ,  G06F3/01

CPC classification number: G03H1/2294 ,  G03H1/0808 ,  G06F3/011

Abstract: Disclosed is a method for processing an input hologram HE associated with an input plane, to obtain an output hologram displayable on a holographic screen placed in a plane called the output plane of a display system, viewable from a viewing plane of the system. The method includes: receiving the input hologram and a position of the input plane; obtaining a first transfer matrix representative of a propagation between the input plane and the viewing plane; obtaining a second transfer matrix representative of a propagation between the viewing plane and the output plane; calculating an overall matrix of transfer of a light field emitted by the input hologram, between the input plane and the output plane, by taking the product of the two matrices; and converting the input hologram into the output hologram by applying an operator dependent of the input hologram and on the screen.

公开(公告)号：US20240282001A1

公开(公告)日：2024-08-22

申请号：US18573226

申请日：2022-06-23

Applicant: FONDATION B-COM

Inventor： Mathieu GONZALEZ ,  Eric MARCHAND ,  Amine KACETE ,  Jérôme ROYAN

IPC: G06T7/73 ,  G06T7/579 ,  G06V10/764 ,  G06V10/82

CPC classification number: G06T7/73 ,  G06T7/579 ,  G06V10/764 ,  G06V10/82 ,  G06T2200/04 ,  G06T2207/20084

Abstract: A device, a mapping system, and a method for determining a map of a three-dimensional environment including objects determine common characteristic elements in first and second images of the environment, determine groups of characteristic elements by an image analysis such that each group of characteristic elements corresponds to an object of the environment, estimate a three-dimensional position of the characteristic elements based on a triangulation between positions of the characteristic elements in the first image and positions of the corresponding characteristic elements in the second image, and, for each group of characteristic elements, optimize the three-dimensional positions of the characteristic elements of the respective group by minimizing an error variable which is a function, for all the characteristic elements of the group, of a distance between a detected position of the characteristic elements from at least the first image and a two-dimensional position associated with the corresponding estimated three-dimensional position.

公开(公告)号：US20240042694A1

公开(公告)日：2024-02-08

申请号：US18258792

申请日：2021-12-17

Applicant: FONDATION B-COM

Inventor： Albert MURIENNE ,  Laurent LAUNAY

IPC: B29C64/386

CPC classification number: B29C64/386 ,  B33Y50/00

Abstract: A method for constructing a 3D label from a precursor element and the 3D label are provided, the precursor element including at least one surface, the method including: determining at least one 2D representation associated with the at least one surface of the precursor element, the 2D representation comprising a plurality of values associated with parts of the surface of the precursor element, respectively, and constructing a corresponding section of the 3D label from the surface by attaching a structural feature of an element of the respective section, defining said element from the surface according to a value of the 2D representation associated with the respective part of the surface.