Abstract: The invention relates to a display method for displaying an image on a screen (24) of a headset (16) of a system (12) for aiding navigation, the system (12) for aiding navigation comprising the headset (16), and a calculator (18). The method comprises the successive steps: of measuring the orientation of the headset (16) of the operator furnished with the headset (16); of processing a first image having a first number of pixels so as to obtain a first processed image; of extracting a part of the first processed image as a function of the measured orientation of the headset (16) so as to obtain a second image, the second image having a second number of pixels strictly lower than the first number of pixels; and of dispatching by the calculator (18) to the headset (16) of the second image for display on the screen (24).

Abstract: The invention relates to a system suitable for providing an operator with enhanced visibility, useful in particular to aid aircraft piloting, comprising at least one sensor able to capture image data in a given spectral band and a central calculation unit able to process the image data captured and to transmit them to a display unit. This system comprises: at least one high-resolution sensor (20) able to acquire image data forming a digital image (I0) in a spectral band including at least all or some of the spectral band visible to the human eye, of first spatial resolution, and of strictly finer angular capture resolution than the angular resolution of the human eye, and a nonlinear processing module (22) adapted to produce a change in spatial resolution while preserving bright points of said digital image acquired (I0) so as to obtain a digital image (I1) to be displayed of second spatial resolution lower than the first spatial resolution.

Abstract: A method for formulating a knowledge database of object images acquired by an imaging device furnished with a sensor, including defining N classes each including a set of objects represented by a label and a set of characteristics, learning decision rules associated with these classes, definition of K contextual information cues regarding image background fk, with k varying from 1 to K and K>1, association of one of these information cues regarding image background fk with each object, allotting of the objects into M new classes, with N<M?K×N, each including a set of objects represented by a new label including an old label and one of said information cues regarding image background fk and the set of characteristics of these objects, definition for each background fk of a subset Qk of these M classes associated with this image background, learning of decision rules for each of these subsets Qk.

Abstract: The invention relates to a display method for displaying an image on a screen (24) of a headset (16) of a system (12) for aiding navigation, the system (12) for aiding navigation comprising the headset (16), and a calculator (18). The method comprises the successive steps: of measuring the orientation of the headset (16) of the operator furnished with the headset (16); of processing a first image having a first number of pixels so as to obtain a first processed image; of extracting a part of the first processed image as a function of the measured orientation of the headset (16) so as to obtain a second image, the second image having a second number of pixels strictly lower than the first number of pixels; and of dispatching by the calculator (18) to the headset (16) of the second image for display on the screen (24).

Abstract: The invention relates to an imaging device which includes a matrix IR detector, a multifocal lens with a focal length ranging from a short focal length to a long focal length, including a front group of lenses, a variator, a compensator and means for positioning the variator and the compensator, the positions of the variator and of the compensator being respectively adapted to the focal length. This device includes a calibration system which comprises a control for the means for positioning the variator in the vicinity of its short focal length position and the compensator upstream of its long focal length position so as to conjugate the plane of the detector with a real object plane located upstream of the front group of lenses, this positioning being called calibration positioning.

Abstract: A method for formulating a knowledge database of object images acquired by an imaging device furnished with a sensor, including defining N classes each including a set of objects represented by a label and a set of characteristics, learning decision rules associated with these classes, definition of K contextual information cues regarding image background fk, with k varying from 1 to K and K>1, association of one of these information cues regarding image background fk with each object, allotting of the objects into M new classes, with N<M?K×N, each including a set of objects represented by a new label including an old label and one of said information cues regarding image background fk and the set of characteristics of these objects, definition for each background fk of a subset Qk of these M classes associated with this image background, learning of decision rules for each of these subsets Qk.

Abstract: A method for designating a target in an area, intended for a weapon having terminal guidance via imaging, by means of an airborne optronic system comprising an imager associated with geolocation means and a processing unit. It comprises the steps of: acquisition of an image of the area by the imager of the system, and geolocation of this image by the geolocation means; extraction from a database of an orthoimage of the geolocated area, called the reference virtual image; designation of the position of the target in the reference virtual orthoimage; extraction from the reference virtual orthoimage of primitives around the position of the target, called virtual primitives; determination of the position of the target with respect to these virtual primitives; transferring the virtual primitives and the position of the target to the weapon having terminal guidance via imaging.

Abstract: The invention relates to a method of stabilizing the images of a scene, acquired by means of an observation device of an imaging system, comprising the step of digital processing of a stream of successive images. It comprises a step of acquiring gyrometric measurements by means of at least one gyrometric sensor secured to the observation device, of using these gyrometric measurements to determine so-called approximate shifts undergone between successive images, and the image processing step comprising a sub-step of using the approximate shifts and the image stream acquired to determine so-called fine shifts undergone between successive images.

Abstract: The invention relates to an imaging device which comprises a matrix IR detector, a multifocal lens with a focal length ranging from a short focal length to a long focal length, including a front group of lenses, a variator, a compensator and means for positioning the variator and the compensator, the positions of the variator and of the compensator being respectively adapted to the focal length. This device includes a calibration system which comprises a control for the means for positioning the variator in the vicinity of its short focal length position and the compensator upstream of its long focal length position so as to conjugate the plane of the detector with a real object plane located upstream of the front group of lenses, this positioning being called calibration positioning.

Abstract: The invention relates to a method of stabilizing the images of a scene, acquired by means of an observation device of an imaging system, comprising the step of digital processing of a stream of successive images. It comprises a step of acquiring gyrometric measurements by means of at least one gyrometric sensor secured to the observation device, of using these gyrometric measurements to determine so-called approximate shifts undergone between successive images, and the image processing step comprising a sub-step of using the approximate shifts and the image stream acquired to determine so-called fine shifts undergone between successive images.

Abstract: A three-dimensional image of an object is constructed by a process using values assumed by a property of the object in an array of elementary volumes of the object. The process determines the measured projections of the property and reconstructs the three-dimensional image of the object by iteration. The iteration includes steps of carrying out a reconstruction of a first three dimensional image of the object, estimating local parameters defining an anisotropic model of the object as a function of the reconstructed three-dimensional image, deducing calculated projections of the property passing through at least one elementary volume, comparing at least one calculated projection with the measured projection in order to deduce therefrom a projection difference, determining a weighting factor, and performing an updating of each elementary volume.