Unconscious imaging (UcI) and its applications for digital signage

This paper proposes a technique to make watching digital signage enjoyable experiences. The proposed technique is based on unconscious imaging (UcI). UcI is composed of two conversions: the first conversion is conscious to unconscious conversion, where apparently visual information is embedded, encrypted, or modulated into unconscious image; the second conversion is unconscious to conscious conversion, where imperceptible information becomes apparent by decoding, detection, or demodulaltion. The second conversion gives viewers enjoyable sensation. Examples for UcI include secure display by use of visual cryptography, a waving-hand steganography by use of temporal modulation, and an aerial LED signage that hides optical hardware and gives only aerial screen.