Hidden engraved character recognition by using THz imaging

K Fukunaga, T Maeno, T Makino - 2016 41st International …, 2016 - ieeexplore.ieee.org
K Fukunaga, T Maeno, T Makino
2016 41st International Conference on Infrared, Millimeter, and …, 2016•ieeexplore.ieee.org
Hidden engraved character recognition by using THz imaging … Hidden engraved
character recognition by using THz imaging …
THz imaging technique is applied to observe and recognise characters under thick lacquer layers. The engraved characters are clearly observed by time-domain systems and by a new instrument with a resonant-tunnelling diode.
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