Machizaud Jacques, Fournel Thierry
Laboratoire Hubert Curien F-42000, Université de Lyon, Université Jean-Monnet, CNRS, UMR 5516, Saint-Etienne, France.
Opt Express. 2012 Sep 24;20(20):22847-59. doi: 10.1364/OE.20.022847.
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.
视觉密码术，即通过透明片之间共享秘密信息，已扩展到彩色打印领域。在本文中，我们提出了一种基于颜色匹配的新型视觉密码术方案。堆叠的打印介质会显示出由人类视觉系统解码的均匀着色的信息。与先前的彩色视觉密码术方案不同，该方案能够在不进行像素扩展的情况下共享图像，并且由于信息颜色保密，还能够检测伪造。为了在介质上正确打印颜色并提高方案的安全性，我们使用了为颜色再现而开发的光谱模型，从光学角度描述打印颜色。
