Abstract: A retroreflective screen comprising including a film having a surface including a plurality of microrecesses, each microrecess having the shape of a truncated pyramid, the lateral walls and the back of each microrecess being coated with a reflective metallization.

Abstract: Device for projecting an image onto an eye, the device comprising a stack comprising light guides, each light guide being coupled to a plurality of diffraction gratings, electrodes, each electrode being associated with a plurality of diffraction gratings of various light guides, each electrode being configured to activate each diffraction grating with which it is associated, a holographic film, the device being characterized in that each light guide extends along a longitudinal axis, in such a way as to form rectilinear segments, two successive rectilinear segments of a given light guide making two different acute angles to the longitudinal axis.

Abstract: The invention relates to a videoconferencing system 1, comprising: a display screen 10, for displaying an image Ie(ti) containing N images Iint(k)(ti); a camera 20, for acquiring an image Ic(tj); a single-pixel-imager-employing optical device suitable for determining N images Ico(k)(tj) on the basis of sub-matrices SMimp(k)(tj) comprising: an optical source 31, suitable for irradiating an ocular portion Po(tj) of the face of the user; a matrix of single-pixel imagers that are suitable for reconstructing a correction image Ico(k)(tj) on the basis of the light beam reflected by the ocular portion Po(tj); a processing unit 40, suitable for: determining, in each image Iint(k)(ti) of the image Ie(ti), a target point Pc(k)(tj), then selecting N sub-matrices SMimp(k)(tj) each centred on a target point Pc(k)(tj); correcting the image Ic(tj), by replacing a region of the image Pc(tj) representing the ocular portion Po(tj) with the N images Ico(k)(tj).

Abstract: A matrix-array optical component that includes, superposed, a holder, a matrix-array of reflectors and at least one matrix-array of holographic lenses with the holder placed between the matrix-array of reflectors and the at least one matrix-array of holographic lenses. The holographic lenses are each formed by at least one reflection hologram, and each includes a through-aperture for letting light pass. Each individual cell of the matrix-array optical component includes one reflector of the matrix-array of reflectors and one holographic lens of the matrix-array of holographic lenses, which are arranged opposite one another on either side of the holder with respective reflective faces of the reflector and of the holographic lens located facing. Thus, a planar matrix-array optical component with a focusing efficiency higher than or equal to 50% and able to focus an incident light beam axially is produced.

Abstract: Devices and computer-implemented methods for analyzing aircraft trajectories, the method includes the steps of receiving data associated with a plurality of aircraft trajectories; breaking the trajectories down into a plurality of vectors, a vector comprising one or more sequences of enumerators; aligning multiple vectorized trajectories by shifting sequences of enumerators by one or more positions; and detecting one or more anomalies in one or more trajectories by unsupervised classification (e.g. DBSCAN). Developments describe the supervised determination of trajectory anomaly detection models, the use of density-based algorithms, the use of one or more neural networks and/or decision trees, one or more display steps, notably displaying root causes (explainable or understandable artificial intelligence), the processing of avionics data flows, etc. System (e.g. computing) and software aspects are described.

Abstract: A Distributed light projection device, including: one or a plurality of waveguides; and above each waveguide, a plurality of extraction cells coupled to distinct portions of the guide, each extraction cell including first and second stacked diffraction gratings.

Abstract: The invention relates to a system for forming a floating image, including: at least one image projector, a display screen including transparent segments and scattering segments, and a semi-reflective structure placed between the image projector and the display screen, including a face, termed the transmission face, suitable for transmitting light beams coming from the image projector and light beams coming from the scene to be observed, and an opposite face, termed the reflection face, suitable for reflecting light beams coming from the display screen, so as to form a virtual image, termed the floating image, of the image projected onto the display screen.

Abstract: A method of manufacturing a primary mold for the forming of a retroreflective screen, the method including the steps of: a) forming, on the front surface of such a substrate, a layer of a material such that the first substrate is selectively etchable over said layer; and b) forming microrecesses from the rear surface of the first substrate by selective etching of the first substrate over said layer, each microrecess emerging on the rear surface of said layer and having a back parallel to the front surface of the first substrate and first and second lateral walls orthogonal to each other and orthogonal to the back the first and second lateral walls and the back of the microrecess joining at a same point and forming a trihedron.

Abstract: The invention relates to a method of manufacturing a screen comprising transparent portions and retroreflective portions distributed over all or part of the surface thereof.

Abstract: The invention relates to a system for forming a floating image, including: at least one image projector, a display screen including transparent segments and scattering segments, and a semi-reflective structure placed between the image projector and the display screen, including a face, termed the transmission face, suitable for transmitting light beams coming from the image projector and light beams coming from the scene to be observed, and an opposite face, termed the reflection face, suitable for reflecting light beams coming from the display screen, so as to form a virtual image, termed the floating image, of the image projected onto the display screen.

Abstract: The invention relates to a method of manufacturing a screen comprising transparent portions and retroreflective portions distributed over all or part of the surface thereof.

Abstract: The invention relates to a screen comprising transparent portions and retroreflective portions distributed over all or part of the surface thereof.

Abstract: A retroreflective screen including a first film having a surface including a plurality of microrecesses, each microrecess having a bottom substantially parallel to the mean plane of the screen and first and second lateral walls substantially orthogonal to each other and substantially orthogonal to the bottom, the first and second lateral walls and the bottom of the microrecess joining at a same point and forming a trihedron.

Abstract: A retroreflective screen including a first film having a surface including a plurality of microrecesses, each microrecess having a bottom substantially parallel to the mean plane of the screen and first and second lateral walls substantially orthogonal to each other and substantially orthogonal to the bottom, the first and second lateral walls and the bottom of the microrecess joining at a same point and forming a trihedron.

Abstract: A retroreflective screen including a first film having a surface including a plurality of microrecesses, each microrecess having a bottom substantially parallel to the mean plane of the screen and first and second lateral walls substantially orthogonal to each other and substantially orthogonal to the bottom, the first and second lateral walls and the bottom of the microrecess joining at a same point and forming a trihedron.

Abstract: A light-emitting device including at least a metal layer able to be heated and to propagate surface waves consecutive to the heating of the metal layer, with the metal layer being structured such that it comprises several diffraction patterns able to carry out a diffraction of the surface waves to free-space propagation modes, wherein a synthetic hologram is encoded such that a phase image of a pixel of the hologram is encoded by an offset in the position of one of the diffraction patterns, and a heater of the metal layer.

Abstract: A method of manufacturing a primary mold for the forming of a retroreflective screen, the method including the steps of: a) forming, on the front surface of such a substrate, a layer of a material such that the first substrate is selectively etchable over said layer; and b) forming microrecesses from the rear surface of the first substrate by selective etching of the first substrate over said layer, each microrecess emerging on the rear surface of said layer and having a back parallel to the front surface of the first substrate and first and second lateral walls orthogonal to each other and orthogonal to the back the first and second lateral walls and the back of the microrecess joining at a same point and forming a trihedron.

Abstract: An image projection device, including: at least one waveguide formed in a substrate; and at least one extraction device including a plurality of extraction cells coupled to different areas of the guide, each cell being capable of being electrically activated to extract light from the guide and project this light along a predetermined projection direction, wherein different extraction cells have projection directions with different orientations.

Abstract: A method for integrating a synthetic hologram in an image of a scene, including: forming, from a first image of the scene, a first matrix including pixels of two shades according to the gray level of the corresponding pixel of the first image, and a second matrix, image of the gray level difference between the corresponding pixels of the first image and of the first matrix; forming a third matrix based on a second image; forming a fourth matrix having each pixel including a central area with a surface area determined by the corresponding element of the second matrix and off-centered in the pixel according to the corresponding pixel of the third matrix; and performing a lithography of an opaque layer at the surface of a plate according to the pattern defined by the fourth pixel matrix.

Abstract: A retroreflective screen including a first film having a surface including a plurality of microrecesses, each microrecess having a bottom substantially parallel to the mean plane of the screen and first and second lateral walls substantially orthogonal to each other and substantially orthogonal to the bottom, the first and second lateral walls and the bottom of the microrecess joining at a same point and forming a trihedron.