Idemia France

Other

Coralie Vandroux

Benoît Berthe

Alban Feraud

Yvonnic Morel

Cédric Barreau

Marie Mazzolini

A security document may include a laserizable first layer including a grayscale image formed by laserizing; a color pattern that is in alignment with the grayscale image; and a second layer arranged between the first layer and the pattern, such that the first layer is above the second layer, and the pattern is below the second layer. The second layer may be more opaque than the first layer, such that when observing the security document from the top, the grayscale image appears to be colored by the color pattern only when the bottom of the security document is being illuminated.

Security document including a laserizable layer and a pattern for illuminating in order to color a grayscale image, and corresponding fabrication and reading methods

A process for producing, under a lenticular grating, in an etching zone, by laser etching, using a tool, a first image and at least one second image that may be selectively viewed by varying angle of observation, the tool including a laser, a galvanometric head and a lens, and defining an optical axis and a working zone, which includes steps of: placing the etching zone in a first location included in the working zone and on the periphery of the working zone, and, perpendicularly to the optical axis, etching the first image; and then placing the etching zone in a second location, which is different from the first location, included in the working zone and on the periphery of the working zone, and, perpendicularly to the optical axis, etching the second image.

Process for producing, by etching through a lenticular grating, images that may be selectively viewed by varying angle of observation

The invention proposes a document configured to generate a color image, comprising: a set of pixels printed on or in a substrate, each pixel forming a pattern including an arrangement of sub-pixels of at least two different colors; and an array of lenses disposed opposite the set of pixels so as to generate the color image by focusing or diverging an incident light through the lenses on at least part of the sub-pixels, each lens being positioned, relative to a facing associated pixel, to focus or diverge the incident light on at least one of the sub-pixels of said associated pixel so as to modify the contribution of the respective colors of the sub-pixels of the associated pixel, in a region of the color image generated through said lens, with respect to the pattern intrinsically formed by the associated pixel independently of said lens.

Document capable of generating a color image

A method for producing a security device () comprising a first colour pattern (A) visible along an associated viewing axis (&#x394;&#x3b1;) and at least one second colour pattern (B) visible along an associated viewing axis (&#x394;&#x3b2;), comprising the following steps:&#x2014;assembling an image layer () suitable for forming at least one colour pattern (A, B) by laser etching, on a support (),&#x2014;laser etching the first colour pattern (A) in the image layer (), along the associated viewing axis (&#x394;&#x3b1;) of same, in such a way that it can be seen through a lens array (),&#x2014;for each of said at least one second colour pattern (B), laser etching said at least one second colour pattern (A) in the image layer (), along the associated viewing axis (&#x394;&#x3b2;) of same, in such a way that it can be seen through a lens array (). A security device () obtained by said method.

Security device with a lens array comprising several etched colour patterns

A method and device for producing a target image having pixels () juxtaposed in a substrate () presenting thickness and producing an image presenting thickness such that each pixel () produces a shadowing effect on its neighboring pixels. The method includes: determining a production setpoint from the target image; and producing an image made by the device using the production setpoint. The determining operation replaces the production setpoint with an improved production setpoint that is determined by modeling the image production device using a transfer function for transforming a production setpoint into a predicted image; and determining an improved production setpoint in which the image produced by the transfer function is as close as possible to the target image, so as to reduce the consequences of the shadowing effect in the resulting image. Also included is the image produced by such a method.

Improving a depth image subject to a shadow effect

A method for verifying a security device including an image having a signature. The method may include operations for acquiring the image in order to obtain a first representation of the image, extracting the signature, and verifying the signature. Also included are implementations in the form of a verification apparatus, a computer program, and a computer data medium including such a computer program.

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Colombes, France

Coralie Vandroux