Abstract:
The general field of the invention is that of systems for detecting the posture of a mobile object. The systems according to the invention comprise a fixed electro-optical device comprising an emission source and a photosensitive sensor. The optical corner cube is arranged on the mobile object. The entry face of the corner cube has a predetermined geometry, the light coming from the source and reflected back by the corner cube forming a luminous contour on the matrix sensor. The fixed electro-optical device comprises an optical element with a known shape and location, which is placed in the vicinity of the said source and is arranged so as to form a dark zone in the central part of the luminous contour. The detection system comprises analysis means determining the position and the orientation of the mobile object from knowledge of the vanishing points of the luminous contour and the position and shape of the dark zone.
Abstract:
The invention relates to a method for verifying a character to be displayed on a screen, compared to a reference character. The character to be displayed and the reference character each comprise at least several characteristic points. The method comprises: a) determining a barycenter of the characteristic points of the character to be displayed, b) computing geometric coordinates of each characteristic point of the character to be displayed in a coordinate system centered on the determined barycenter, and c) computing a deviation between the character to be displayed and the reference character, as a function of the geometric coordinates computed for the character to be displayed and predetermined geometric coordinates for the reference character. The character to be displayed is considered correct only if the computed deviation is below the predetermined threshold.
Abstract:
The general field of the invention is that of systems for detecting the posture of a mobile object in space. The system according to the invention comprises an electro-optical device comprising a light source, a photoreceptor and means of analysis, and a retro-reflecting cube corner disposed on the mobile object. The cube corner comprises a mask disposed on its entry face. The source emits a parallel or almost-parallel pencil beam. The electro-optical device comprises means for deviating, about a fixed point, the said pencil beam of light by an angle varying as a function of time. The photoreceptor is configured for receiving the pencil beam of light retro-reflected by the cube corner. The means of analysis are configured in such a manner as to determine, based on the signal coming from the photoreceptor, the position of a number of points representative of the borders of the mask and, using this positional information, the posture of the cube corner in space.
Abstract:
A touch surface includes an array of rows of electrodes, an input point on a row for injecting an input voltage (VDRIVE), measuring an output voltage (VSENSE) at a second point in the row, p being the number of pitch spacings of the array separating the two points, the portion of the array between the first point and the second point being akin to an electric dipole of resistance (R(p)) and of capacitance (C), the output voltage (VSENSE) being equal to the product of the input voltage (VDRIVE) and a transfer function represented by a complex function (HSENSE). The measurement includes extracting the amplitude (G) and the phase (φ) from the transfer function; and calculating a hybrid function (S(G, φ)) of the amplitude and of the phase, the hybrid function minimizing a sum (Σ) defined by Σ i ∈ [ 0 , p ] ( δ S δ R ( G ( R i ) , φ ( R i ) ) ) .
Abstract:
The general field of the invention is that of methods for three-dimensional conformal representation of a terrain. The method is used in a piloting and navigation assistance system of an aircraft. The assistance system comprises a navigation system, a cartographic database, electronic calculation means a meteorological database and a display system allowing the superimposition of synthetic images on the exterior. The method comprises the following steps: Step 1: Calculation, for a determined position of the vehicle, of the terrain perceptible through the display system; Step 2: Selection of a part of the said terrain as a function of a distance or of an altitude or of a range of altitudes; Step 3: Calculation of a three-dimensional conformal cartographic representation of the said selected part of the terrain; and Step 4: Display of the said cartographic representation by the display system.
Abstract:
The general field of the invention is that of systems for the optical detection of the orientation and the position of a mobile object in space. The system comprises a fixed electro-optical device comprising a transmission point source, image analysis means and an optical cube corner disposed on the mobile object. The input surface of the cube corner comprises a polygonal-shaped mask, the sides of which comprise a geometric marking to identify them. The fixed electro-optical device comprises photosensitive means close to the point source and disposed in two different recording planes and recording two luminous shapes in perspective of the mask obtained by reflection on the surfaces of the cube corner. The image analysis means comprise means for determining the vanishing points of the two luminous shapes in the two recording planes, the knowledge of the four vanishing points enabling the determination of the position and orientation of the optical cube corner in relation to the fixed electro-optical device.