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公开(公告)号：US20230004120A1
公开(公告)日：2023-01-05
申请号：US17784009
申请日：2020-12-03
Applicant: FONDATION B-COM
Inventor： Antonin GILLES , Patrick GIOIA
IPC: G03H1/08 , G06T9/00 , H04N19/176 , H04N19/167
Abstract: A method for encoding a digital hologram represented by values associated respectively with pixels in a plane defining the digital hologram includes forming matrix blocks associated respectively with regions composed of contiguous pixels, each matrix block containing elements determined as a function of the values of the pixels in the region associated with the respective matrix block, applying to each of the matrix blocks a space-frequency transformation to obtain, for each matrix block, a set of coefficients respectively corresponding to different two-dimensional spatial frequencies within the respective matrix block, constructing two-dimensional structures each including coefficients from sets of coefficients and associated with two-dimensional spatial frequencies meeting a criterion that is dependent on the two-respective dimensional structure, and encoding the constructed two-dimensional structures.
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公开(公告)号：US11494928B2
公开(公告)日：2022-11-08
申请号：US17416104
申请日：2019-12-10
Applicant: FONDATION B-COM
Inventor： Nam-Duong Duong , Amine Kacete , Catherine Soladie
Abstract: A method for predicting a three-dimensional representation in a three-dimensional scene, using one or more two-dimensional representations, obtained from at least one image generated by a camera. The method includes obtaining a forest of regression trees, and for the at least one image: extracting a 2D representation associated with one or more positions within the image; predicting a 3D representation, corresponding to the extracted 2D representation, using the regression tree forest includes a set of possible associations between at least one 2D representation and a 3D representation, each possible association resulting from a predictive model; evaluating one or more of the possible associations of the regression tree forest, according to a predetermined confidence criterion; and updating the regression tree forest including a deactivation of one or more possible associations, depending on the evaluation of the possible associations.
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公开(公告)号：US20220292624A1
公开(公告)日：2022-09-15
申请号：US17639720
申请日：2020-09-02
Applicant: FONDATION B-COM
Inventor： Gaëtan LE GUELVOUIT , Valérie DENIS
IPC: G06T1/00
Abstract: A method for inserting information into a first image including N1 rows×M1 columns of elements includes: a) obtaining, from the first image, a second image including N0 rows×M0 columns, N0 ≤N1 and M0≤M1, b) generating initial information including N0 rows×M0 columns, c) obtaining intermediate information including N4 rows×M4 columns of elements, so N4≥N1 and M4≥M1, and N4=kx.N0 and M4=ky.M0, kx and ky being integers≥1, the elements organized into blocks, d) obtaining information to be inserted from the intermediate information, including: generating symbols representing noise, including as many symbols as block elements, at least one <>0, so the result of a function applied to the symbols=a chosen value, adding each symbol to the corresponding block element, and e) inserting the obtained information into the first image.
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公开(公告)号：US11443454B2
公开(公告)日：2022-09-13
申请号：US16762853
申请日：2018-10-24
Applicant: FONDATION B-COM
Inventor： Nam-Duong Duong , Amine Kacete , Catherine Soladie
Abstract: A method for estimating a camera pose in a frame of reference of a three-dimensional scene, including: obtaining an image of colour intensities of the scene; extracting points of interest, which are invariant by geometric transformation of the image; forming patches in the image, each including an extracted point of interest; predicting 3D locations of the points of interest by applying an automatic prediction system, trained by a training set including patches from images acquired from plural points of view, an image being associated with a 2D position of its point of interest in a frame of reference of the image and with a 3D position of its point of interest in the frame of reference of the scene; estimating the pose of a camera, by mapping the 2D positions of the points of interest and reprojections in the current image frame of reference of the predicted 3D locations.
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45.发明授权公开(公告)号：US11323715B2
公开(公告)日：2022-05-03
申请号：US16616252
申请日：2018-06-12
Applicant: FONDATION B-COM
Inventor： Felix Henry
IPC: H04B1/66 , H04N7/12 , H04N11/02 , H04N11/04 , H04N19/13 , H04N19/119 , H04N19/176 , H04N19/64 , H04L65/60
Abstract: A method for decoding an encoded data stream representative of at least one image, which is divided into blocks. The decoding method includes, for a current block: evaluating a plurality of value hypotheses of at least one description element of the current block, by calculating a likelihood measurement per hypothesis; calculating a disparity in the likelihood measurements obtained; determining at least one parameter of a decoder based on the calculated disparity; decoding, using the determined decoder, complementary information for identifying at least one of the hypotheses; and identifying at least one of the hypotheses using the decoded complementary information and obtaining a value of the at least one description element for the current block, from the at least one identified hypothesis.
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Patent Agency Ranking
公开(公告)号：US11202032B2
公开(公告)日：2021-12-14
申请号：US17127115
申请日：2020-12-18
Applicant: FONDATION B-COM
Inventor： Foteini Tania Pouli , Cambodge Bist , Jean-Yves Aubie
Abstract: A method is described for converting an input image into an output image, the output image including an output luminance component made of elements. The method includes: obtaining an input luminance component from the input image; determining the output luminance component, the respective ranges of the output luminance component element values and input luminance component element values being of different range extension, the determining step including: —determining a first intermediate luminance component from the input luminance component and an exponent, —obtaining a mapping profile allowing for mapping a luminance component based on the input luminance component into the output luminance component, —determining a second intermediate luminance component from the input luminance component and the obtained mapping profile, —determining the output luminance component from the first and second intermediate luminance components; and converting the input image into the output image.
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47.发明授权公开(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.
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48.发明申请公开(公告)号：US20210240135A1
公开(公告)日：2021-08-05
申请号：US17050214
申请日：2019-03-20
Applicant: FONDATION B-COM
Inventor： Patrick GIOIA , Antonin GILLES
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.
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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.
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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.
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