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US 2003/0156294 A1Published application
Method for identifying an object
AssigneeEuropean Community
InventorsBertrand Causse D'Agraives, Michel Chiaramello
Life of this patent
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AssigneeEuropean Community
InventorsBertrand Causse D'Agraives, Michel Chiaramello
Estimating the term…
The invention concerns a method for identifying an object comprising the following steps: (a) selecting an intrinsic surface of an object to be identified; (b) illuminating at least an identification zone in the intrinsic surface of the object to be identified with a coherent light and intercepting at least part of the light reflected by the identification zone, so as to obtain an interference figure in specific illuminating and intercepting conditions; (c) preserving said interference figure as reference interference figure of the object to be identified; (d) placing a candidate object which could possibly be the object to be identified in similar illuminating and intercepting conditions as those used to obtain the reference interference figure and obtain from said candidate object an interference figure; (e) comparing the reference interference figure with the interference figure of the candidate object; and (f) assessing the probability of identity between the object to be identified and the candidate object based on the degree of correspondence between the reference interference figure and the interference figure of the candidate object.
A method for identifying an object wherein at least one identification area is illuminated with coherent light and at least one portion of the light reflected by said identification area is intercepted, so as to obtain an interference pattern under determined illumination and interception conditions, and then said interference pattern is used for identifying said object, characterized by the following steps:
A method according to any one of the preceding claims, characterized in that said identification area has a peak-to-peak roughness, which is larger than a quarter of the laser's wavelength.
A method according to any one of the preceding claims, characterized in that the reflected light is intercepted by means of a screen, a camera or a charge coupled device.
A method according to any one of the preceding claims, characterized in that one proceeds with the acquisition of interference patterns, with computer means and in that the reference interference pattern is retained on a computer medium.
A method according to any one of the preceding claims, characterized in that the matching level between said reference interference pattern and said interference pattern of the candidate object is determined by image processing computer means.
A method according to any one of the preceding claims, characterized in that said intrinsic surface is a machined surface of said object to be recognized.
Dependencies are inferred from the claim text.