发明名称 |
Synthesis of authenticable halftone images with non-luminescent halftones illuminated by a luminescent emissive layer |
摘要 |
A method and computing system are proposed for producing an authenticable security device with two sides. The verso side is covered with a luminescent emissive variable intensity layer formed for example by invisible luminescent ink halftones and the recto side is covered with transmissive non-luminescent ink halftones. The backlit colors resulting from the emissions of the luminescent layer or resulting from illumination by normal white light through the transmissive non-luminescent ink halftones are predicted by a backlighting model. This model enables computing the surface coverages of the luminescent and/or non-luminescent ink halftones in order to obtain a desired color either under excitation light (UV light) or under normal white light. This enable creating authenticable backlit images substantially similar to pre-stored reference images, either under normal white light, under excitation light, or under both the normal white light and the excitation light. |
申请公布号 |
US2013181435(A1) |
申请公布日期 |
2013.07.18 |
申请号 |
US201213374823 |
申请日期 |
2012.01.17 |
申请人 |
HERSCH ROGER D.;ANDRES JULIEN;ECOLE POLYTECHNIQUE FEDERALE DE LAUSANNE (EPFL) |
发明人 |
HERSCH ROGER D.;ANDRES JULIEN |
分类号 |
B42D15/00;H04N1/405;H04N5/30 |
主分类号 |
B42D15/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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