METHOD FOR OPTICAL AUTHENTICATION AND IDENTIFICATION OF OBJECTS AND DEVICE THEREFOR

摘要

The invention concerns a method which consists in illuminating with coherent light one at least partly scattering surface in volume of control objects in specific illumination conditions, in recording the resulting speckle pattern for different nominal values of illumination parameters and in a range of values around said nominal values, then, upon verification of other objects or those same objects, in illuminating said objects in the same nominal conditions and comparing each time the resulting speckle pattern with those which have been recorded and in keeping the objects if their speckle pattern corresponds to one of those which have been recorded.