22 September 2015 Non-destructively reading out information embedded inside real objects by using far-infrared light
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This paper presents a technique that can non-destructively read out information embedded inside real objects by using far-infrared-light. We propose a technique that can protect the copyrights of digital content for homemade products using digital fabrication technologies such as those used in 3D printers. It embeds information on copyrights inside real objects produced by 3D printers by forming fine structures inside the objects as a watermark that cannot be observed from the outside. Fine structures are formed near the surface inside real objects when they are being fabricated. Information embedded inside real objects needs to be read out non-destructively. We used a technique that could non-destructively read out information from inside real objects by using far-infrared light. We conducted experiments where we structured fine cavities inside objects. The disposition of the fine domain contained valuable information. We used the flat and curved surfaces of the objects to identify them. The results obtained from the experiments demonstrated that the disposition patterns of the fine structures appeared on the surface of objects as a temperature profile when far-infrared light was irradiated on their surface. Embedded information could be read out successfully by analyzing the temperature profile images of the surface of the objects that were captured with thermography and these results demonstrated the feasibility of the technique we propose.
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Ayumi Okada, Ayumi Okada, Piyarat Silapasuphakornwong, Piyarat Silapasuphakornwong, Masahiro Suzuki, Masahiro Suzuki, Hideyuki Torii, Hideyuki Torii, Youichi Takashima, Youichi Takashima, Kazutake Uehira, Kazutake Uehira, } "Non-destructively reading out information embedded inside real objects by using far-infrared light", Proc. SPIE 9599, Applications of Digital Image Processing XXXVIII, 95992V (22 September 2015); doi: 10.1117/12.2189486; https://doi.org/10.1117/12.2189486

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