发明授权
US07537161B2 Method and device for checking authenticity of a security element 失效
用于检查安全元件真实性的方法和设备

Method and device for checking authenticity of a security element
摘要:
The invention relates to a method, in which from two images of a security element, which are recorded with right-handed and left-handed circularly polarizing filters, a differential image is produced, on the basis of which the authenticity of the security element is tested, and an apparatus for carrying out the method.
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