Abstract
Visual cryptography can be used as a method of sharing a secret image through several encrypted images. Conventional visual cryptography can display only monochrome images. We have developed a high-chroma color visual encryption technique using the interference color of high-order retarder films. The encrypted films are composed of a polarizing film and retarder films. The retarder films exhibit interference color when they are sandwiched between two polarizing films. We propose a stacking technique for displaying high-chroma interference color images. A prototype visual cryptography device using high-chroma interference color is developed.
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Sugawara, S., Harada, K. & Sakai, D. High-chroma visual cryptography using interference color of high-order retarder films. Opt Rev 22, 544–552 (2015). https://doi.org/10.1007/s10043-015-0095-4
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DOI: https://doi.org/10.1007/s10043-015-0095-4