26 April 2007 Optical security and anti-counterfeiting using 3D screen printing
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Abstract
This work presents a novel method for optical decrypted key production by screen printing technology. The key is mainly used to decrypt encoded information hidden inside documents containing Moire patterns and integral photographic 3D auto-stereoscopic images as a second-line security file. The proposed method can also be applied as an anti-counterfeiting measure in artistic screening. Decryption is performed by matching the correct angle between the decoding key and the document with a text or a simple geometric pattern. This study presents the theoretical analysis and experimental results of the decoded key production by the best parameter combination of Moire pattern size and screen printing elements. Experimental results reveal that the proposed method can be applied in anti-counterfeit document design for the fast and low-cost production of decryption key.
© (2007) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
W. H. Wu, W. K. Yang, S. H. Cheng, M. K. Kuo, H. W. Lee, C. C. Chang, G. R. Jeng, C. P. Liu, "Optical security and anti-counterfeiting using 3D screen printing", Proc. SPIE 6558, Display Technologies and Applications for Defense, Security, and Avionics, 65580N (26 April 2007); doi: 10.1117/12.719167; https://doi.org/10.1117/12.719167
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