Aerial imaging by retro-reflection (AIRR) is an aerial-image-forming technique by use of a retro-reflector [1]. Our previous study proposed a novel steganography that utilizes AIRR and two clear spheres in the same size. The proposed technique used one of the clear spheres as a key to form an aerial image that was formed with AIRR [2].

© 2019 Japan Society of Applied Physics, The Optical Society (OSA)

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