| 发明名称 |
METHOD AND APPARATUS FOR AUTHENTICITY TESTING A SECURITY ELEMENT |
| 摘要 |
The invention relates to a method whereby a difference image is generated fr om two images taken of a security element, using right- and left-circular polarising filters and which is used to check the authenticity of the securi ty element and a device for carrying out the above method. |
| 申请公布号 |
CA2493211(A1) |
申请公布日期 |
2004.02.05 |
| 申请号 |
CA20032493211 |
申请日期 |
2003.07.24 |
| 申请人 |
GIESECKE & DEVRIENT GMBH |
发明人 |
MAYER, KARLHEINZ;PLASCHKA, REINHARD;DEPTA, GEORG |
| 分类号 |
G07D7/20;G07D7/12 |
主分类号 |
G07D7/20 |
| 代理机构 |
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