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8 June 2005 Detection and authentication of objects by using distortion-invariant optical ID tags
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Distortion-invariant identification (ID) tags are designed for remote identification and verification of objects. An optical code contained in an ID tag, placed in a visible part of an object, can be detected and verified by a remote receiver even if it captures a distorted version of the code due to in-plane rotations and variations in scale. In a general pattern recognition task, these distortions usually require to increase the level of complexity of the recognition system. We aim to use a less complex identification system that operates in real-time. Distortion-invariance is achieved by both multiplexing the information included in the ID tag and taking advantage of the topology of the tag. For security purposes, double-phase encryption has already been shown as an appropriate technique to encode the information. By using double phase encryption, a signature is hidden in an encoded ID tag. Once the ID tag is captured by the receiver and is decrypted, a correlation-based processor verifies the decoded information with a previously stored reference signal. The proposed system may have broad applications in transportation, in tasks such as the security control of authorized vehicles inside a restricted area, or in the control of objects for inventory purposes.
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Elisabet Perez-Cabre, Bahram Javidi, and Maria S. Millan "Detection and authentication of objects by using distortion-invariant optical ID tags", Proc. SPIE 5827, Opto-Ireland 2005: Photonic Engineering, (8 June 2005);

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