@article{oai:kitami-it.repo.nii.ac.jp:00008264,
 author = {Harada, Kenji and Yamaguchi, Takenobu and Tsuchida, Tomohiro and Sakai, Daisuke},
 issue = {6R},
 journal = {Japanese Journal of Applied Physics},
 month = {May},
 note = {Visual cryptography is known as a method of sharing a secret image through several encrypted images. Conventional visual cryptography can display only monochrome images. We develop a multicolor visual encryption technique using the interference color of high-order retarder films. The encrypted films are composed of a polarizing film and retarder films. Retarder films exhibit an interference color upon sandwiching between two polarizing films. A prototype of a visual cryptography device using interference color is developed. Eight colors are represented by combining an encrypted image and a decoding mask composed of retarder films with various retardations.},
 title = {Visual Cryptography Using Interference Color of High-Order Retarder Films},
 volume = {52},
 year = {2013}
}