title: Two-out-of-two color matching based visual cryptography schemes.
abstract: Visual cryptography which consists in sharing a secret message between transparencies has been extended to color prints. In this paper, we propose a new visual cryptography scheme based on color matching. The stacked printed media reveal a uniformly colored message decoded by the human visual system. In contrast with the previous color visual cryptography schemes, the proposed one enables to share images without pixel expansion and to detect a forgery as the color of the message is kept secret. In order to correctly print the colors on the media and to increase the security of the scheme, we use spectral models developed for color reproduction describing printed colors from an optical point of view.
authors.affiliation: Laboratoire Hubert Curien F-42000, Université de Lyon, Université Jean-Monnet, CNRS, UMR 5516, Saint-Etienne, France.
authors.forename: Jacques
authors.initials: J
authors.lastname: Machizaud
authors.forename: Thierry
authors.initials: T
authors.lastname: Fournel
mesh_terms: D003116:Color; D003124:Colorimetry / Q000379:methods*; D016247:Information Storage and Retrieval / Q000379:methods*; D010363:Pattern Recognition, Automated / Q000379:methods*; D012637:Security Measures