Thomson-csf

Thales

In-idt

Philippe Robin

Dominique Broussoux

Claude Bricot

Brigitte Loiseaux

Hugues Facoetti

Jean-Claude Dubois

Jean Claude Dubois

Jean-Marc Bureau

Cécile Joubert

Yves Thebault

Jean-Pierre Huignard

Francois Micheron

Michel Hareng

Bruno Mourey

Pierre Le Barny

Jean P Pocholle

Pierre Aigrain

Patrick Petit

Francedillaois Bernard

Patrick Batail

Pierre LeBarny

Sophie Esselin

Francois Bernard

Jean-Pierre Paschal

Jean Raffy

Michel Cormier

Valerie Letournel

Evelyne Chastaing

Albert Robert

Francoise Bertho

Pierre Ly

Sébastien Guionnet

Jérôme Ageron

Andreas Oppenlander

Charles Sayac

Henri Gargallo

Francedillaois Buchy

Christian Riguidel

A method for detecting a fake finger for fingerprint acquisition software with improved performance, the method implementing a static analysis step including a calculation of a Gray Level Run Length matrix of an image of a finger. Optionally, but preferably, the static analysis and a dynamic analysis are combined so as to optimize the ability to detect fake fingers.

Method for detecting a fake finger for fingerprint acquisition software

The present invention relates to a method of enhancing document security for documents of the type each comprising a print medium on which is printed personalizing information, this printed medium being laminated between two laminates that are at least partially transparent, this method rendering any forging of these documents by ungluing the laminates ineffective, and it is characterized in that at least one additional phantom personalizing image is printed on at least one of the laminates.

Method for enhancing document security and device for implementing said method

The method of the invention consists, on the one hand, in serially recording on a tape of photosensitive film a succession of volume holograms each relating respectively to an item of information of a corresponding document to be made secure, each of these holograms being accompanied by an identification and positioning code printed on the same film, in developing and in fixing the holograms thus recorded, and on the other hand in printing at the same time the identity documents with their individual identification codes which are the same as those of the respective corresponding holograms, in adding an adhesive to the holograms after their fixing, and in adhesively bonding together each hologram and the corresponding document after verifying that their respective identification codes match.

Method for serial production of secure documents and machine therefor

A document includes at least one drawing or data produced, for example, by printing. In addition, this document includes a hologram representing part of the document. The hologram of this document is recorded using a system including a prerecorded or electrically controllable optical modulator in which the image of at least part of the document is recorded. This modulator is designed to be combined with a layer of photosensitive material. A first reference wave illuminates the layer of photosensitive material. A second wave incident on the modulator and giving rise to a third object wave is also transmitted to the layer of photosensitive material in order to interfere with the reference wave in this layer.

Secured document, system for manufacturing same and system for reading this document

An electronic card having an electronic control circuit, an elector-optical element configured as a normal operation indicator, and a power supply source. Electrical tracks connect the electronic control circuit with the electro-optical element and the power supply source, and affixing elements attach the electronic card to a substantially planer surface. The electrical tracks having embrittlement grooves which destroy the connections made by the electrical tracks upon removal of the electronic card from the substantially planer surface to which the electronic card is attached. The electronic card is suited for applications in the identification and automatic detection of objects and in particular, stolen vehicles.

Electronic card with indicator of normal operation

A thermal imaging detector including a layer of heat-sensitive material which includes a doped ferroelectric material exhibiting a pronounced rise in resistance with temperature in the vicinity of the ferroelectric/paraelectric transition, a multiplexing circuit, a thermally insulating thin-film microstructure, and a matrix segmentation at the level of the material of the heat-sensitive layer, so as to define heat-sensitive picture elements.

Bolometric thermal detector

A thermal detector with a monolithic structure comprises a layer of material sensitive to infrared radiation and an insulating layer constituted by a thermostable polymer that can be deposited as a thin layer and has a microporous structure. This insulating layer enables the thermal decoupling of the sensitive layer from the substrate comprising reading circuits with which the detector is provided. The performance characteristics of currently used monolithic infrared detectors can thus be substantially improved through the notable reduction of the thermal losses in the sensitive layer. This is achieved through the greatly reduced thermal conductivity of the layer of dielectric polymer. Application to infrared imaging devices.

Thermal detector comprising a thermal insulator made of expanded polymer

Image projection display screen employing polymer dispersed liquid

Process for obtaining a structure generating non-linear electrooptical

Disclosed is an optical component for applications in integrated optics, including a substrate that supports a stack of three polymer layers: a lower layer deposited on the substrate, a central layer and an upper layer, the lower and upper layers having optical indices smaller than that of the central layer which is electrooptical and designed to convey a light beam, the lower layer or the upper layer possessing zones having indices of different values to create a zone of confinement of the light beam in the central layer.

Optical component for applications in integrated optics

An infrared detector based on pyroelectric material, of the type associated with a reading circuit prepared on a semiconductor substrate, the substrate also supporting conductive blocks designed to transmit the electrical signals generated by the pyroelectric material towards the reading circuit. Each conductive block corresponds to a picture element or pixel, wherein the detector is formed by a layer of pyroelectric material deposited on that side of the semiconductor layer having the conductive blocks. The pyroelectric material has a thermal conductivity of K&lt;1 W/m..degree.K., a counter-electrode covering the layer of pyroelectric material on the side opposite the conductive blocks.

Infrared detector based on pyroelectric material

In a method of construction of an electrooptical display screen and especially a liquid-crystal screen, a control point of an image element is provided with a coupling element of ferroelectric material between an electrode and a control lead.

Electrooptical display screen and a method of fabrication of said screen

The invention pertains to organic compounds of the tetrahiafulvalene type made amphiphillic by substitution of the radicals R.sup.1 and R.sup.2 meeting one of the following conditions:

Organic compounds of the tetrathiafluvalene type which can be used to

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Bourg la Reine, France

Philippe Robin