Hiding an image with a light-scattering medium and use of a contrast-discrimination method for readout.
Hiding image data with a material such as a light-scattering medium is useful as an initial stage of data protection, because the hidden image can be detected only by observation with a specific technique. A light-scattering medium is used to hide the image data, and a low-temporal-coherence interferometer performs the readout processing. A new readout method for detecting pixel values of the image is proposed to overcome spatial variation of the light intensity and distortion of the interference fringes. The introduction of spatial coding further improves the performance by overcoming spatial variations of the light-scattering medium and variations in the reflectance of given pixels.
Hayasaki
Yoshio
Y
Department of Optical Science and Technology, Faculty of Engineering, The University of Tokushima, 2-1 Minamijyosanjima-cho, Tokushima, 770-8506, Japan. hayasaki@opt.tokushima-u.ac.jp
Matsuba
Yoshiaki
Y
Nagaoka
Atsushi
A
Yamamoto
Hirotsugu
H
Nishida
Nobuo
N
D016494:Computer Security / Q000295:instrumentation; D004867:Equipment Design; D007091:Image Processing, Computer-Assisted; D016247:Information Storage and Retrieval / Q000379:methods*; D007368:Interferometry; D008027:Light; D008962:Models, Theoretical; D012542:Scattering, Radiation