Ecole Polytechnique Federale De Lausanne

Thomas Walger

Roger David Hersch

Juergen Brugger

Valentin Flauraud

Théophane Besson

Jürgen Brugger

The present invention proposes a method for producing an authenticable moir&#xe9; shape that simultaneously moves and shows a beating effect. The method relies on a combination of the 1D or the 2D moir&#xe9; and the level line moir&#xe9;. When tilting a compound showing such a moir&#xe9;, the moir&#xe9; shape moves, its intensity levels change significantly but its shape remains the same and is recognizable. Embodiments comprise a base layer made of patterned metallic tiny shapes and a revealing layer made of a 1D array of cylindrical lenslets or of a 2D array of spherical or aspherical lenslets.

Synthesis of moving and beating moir&#xe9; shapes

The present invention describes methods and apparatuses for creating superposition shape images by superposed base and revealing layers of lenslet gratings. The superposition shape images form a message recognizable by a human observer or by an image acquisition and computing device such as a smartphone. The superposition shape images may be created by different superposition techniques ranging from 1D moir&#xe9;, 2D moir&#xe9; and level-line moir&#xe9; superposition techniques to lenticular image and phase shift superposition techniques. Moir&#xe9; superposition techniques enable creating superposition shape images at different apparent depth levels. Applications comprise the protection of documents and valuable articles against counterfeits, the creation of eye-catching advertisements as well as the decoration of buildings and exhibitions.

Synthesis of superpostion shape images by light interacting with superposed layers of lenslet gratings

Synthesis of superposition shape images by light interacting with layers of lenslets

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Prilly, Switzerland

Thomas Walger