一种新的基于水印技术的隐形编码技术及实现

将一种新的基于水印技术的隐形编码技术应用于印刷品之上,通过装载了对应解码程序的智能手机对含有隐形编码的印刷品获取图像并解析,从而做出印刷品是否含有隐形编码的判断。解码时利用自动白平衡、直方图均衡算法、图像分割算法进行图像预处理,再基于模板匹配算法进行模式识别从而解码。实验结果表明,解码有很好的鲁棒性以及较高的识别正确率,从而实现了利用智能手机对印刷在纸质印刷品上隐形编码的识别功能。

Scheme for Implementing Quantum Dense Coding and Teleportation with Tripartite Entangled State in Cavity QED

In this paper, we present a peculiar tripartite entangled state that is inequivalent to both the GHZ state and the W state, and then propose to implement efficient quantum information processing such as quantum dense coding and teleportation with this entangled state in cavity QED. In this scheme the atoms interact with a highly detuned cavity field with the assistance of a strong classical driven field. It does not require the transfer of quantum information between the atomic system and the cavity, and then our scheme is insensitive to both the cavity decay and the thermal field.