公开(公告)号：US20230050498A1

公开(公告)日：2023-02-16

申请号：US17786091

申请日：2020-12-18

Applicant: FONDATION B-COM

Inventor： Foteini Tania POULI ,  Olivier WEPPE ,  Benoît LE LUDEC

IPC: G06T5/00

Abstract: The invention concerns a method for converting an input image comprising an input luminance component made of elements into an output image comprising an output luminance component made of elements, the respective ranges of the output luminance component values and input luminance component element values being of different range extension. the method comprises for the input image: computing a value of a general variable representative of at least two input luminance component element values; transforming each input luminance component element value into a corresponding output luminance component element value according to the computed general variable value; and converting the input image using the determined output luminance component element values. The transforming step uses a set of pre-determined output values organized into a 2D Look-Up-Table (2D LUT) comprising two input arrays indexing a set of chosen input luminance component values and a set of chosen general variable values respectively, each pre-determined output value matching a pair of values made of an indexed input luminance component value and an indexed general variable value, the input luminance component element value being transformed into the output luminance component element value using at least one predetermined output value.

公开(公告)号：US20230031343A1

公开(公告)日：2023-02-02

申请号：US17789440

申请日：2020-12-18

Applicant: FONDATION B-COM

Inventor： Nicolas EPAIN

IPC: G01S5/20

Abstract: A method and associated system for estimating a quantity representative of the sound energy at at least one point of a three-dimensional space where a plurality of antennas are situated, each including at least K acoustic sensors, K being higher than or equal to 2, includes for each antenna of the plurality of antennas, production of a plurality of signals representative of the sound field at the antenna in question, for each antenna of the plurality of antennas, determination of a raw value of the quantity at the point based on at least K+1 elements of a matrix that are based respectively on pairwise combinations of representative signals produced by the antenna in question, and determination of an estimated value of the quantity at the point by combining the raw values of the quantity at the point determined respectively for the various antennas of the plurality of antennas.

公开(公告)号：US20220368889A1

公开(公告)日：2022-11-17

申请号：US17622094

申请日：2020-06-24

Applicant: FONDATION B-COM

Inventor： Félix HENRY ,  Gordon CLARE

IPC: H04N19/105 ,  H04N19/186 ,  H04N19/176 ,  H04N19/46

Abstract: Proposed is a method for encoding an image of a video sequence, the image including at least two components, including a component representative of the luminance and a component representative of the chrominance, each component being partitioned into blocks, wherein the method involves encoding at least one block of the chrominance component using a BDPCM mode.

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.

公开(公告)号：US11374799B2

公开(公告)日：2022-06-28

申请号：US17288224

申请日：2019-10-09

Applicant: FONDATION B-COM

Inventor： Luc Le Magoarou ,  Antoine Le Calvez ,  Stéphane Paquelet

IPC: H04B7/0413 ,  H04L25/02

Abstract: A method for estimating a wireless communication channel between a transmitter and a receiver, including a plurality of paths for propagation of a wave, at least one of the transmitter and the receiver being formed of a plurality of antennas. The method includes: for at least one path, determining a characteristic matrix, which depends on a first element representative of at least one propagation direction associated with the path, and a second element representative of a propagation distance associated with the path; and estimating the communication channel from the at least one obtained characteristic matrix.

公开(公告)号：US11372369B2

公开(公告)日：2022-06-28

申请号：US17255612

申请日：2019-05-28

Applicant: FONDATION B-COM

Inventor： Antonin Gilles ,  Patrick Gioia

IPC: G03H1/08 ,  G02B27/01 ,  G03H1/00 ,  H04N13/366 ,  H04N13/385

Abstract: Disclosed is a method for generating a digital hologram representing a 3D scene including an object, an object being defined by points and their associated intensity. For each object, a prior step of calculating an “omnidirectional” angular spectrum of the light field emitted by an object in the scene on the surface of a geometric solid centered on the object, a surface of the solid being sampled according to a predetermined grid, a sample of the grid being associated with a vector frequency; for the scene, the following steps: —obtaining a pose of an observer in the world frame of reference; —deriving the hologram from the scene as a function of the pose obtained from the “multidirectional” angular spectra calculated for each object. The step of calculating an angular spectrum of the light field for each object of the scene takes into account predetermined viewing directions.

公开(公告)号：US20220187766A1

公开(公告)日：2022-06-16

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：US20220132262A1

公开(公告)日：2022-04-28

申请号：US17413229

申请日：2019-12-13

Applicant: FONDATION B-COM

Inventor： Alexandre Guérin

IPC: H04S7/00

Abstract: A method for interpolating a sound field captured by a plurality of N microphones each outputting the encoded sound field in a form including at least one captured pressure and an associated pressure gradient vector. Such a method includes an interpolation of the sound field at an interpolation position outputting an interpolated encoded sound field as a linear combination of the N encoded sound fields each weighted by a corresponding weighting factor. The interpolation includes an estimation of the N weighting factors at least from: the interpolation position; a position of each of the N microphones; the N pressures captured by the N microphones; and an estimated power of the sound field at the interpolation position.

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.