A lensless optical security system based on computer-generated phase only masks
A lensless optical security system based on computer-generated phase only masks
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DOI：
10.1016/j.optcom.2004.01.002
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发表时间：
2004-03
影响因子：
2.4
通讯作者：
G. Situ;Jingjuan Zhang
中科院分区：
文献类型：
--
作者：
G. Situ;Jingjuan Zhang
本文提出了一种基于计算机生成的仅相位掩模的无透镜光学安全系统。这些掩模位于沿传播方向的确定位置，以解密目标图像。这些位置坐标用作编码参数以及加密过程中的波长。与之前的研究相比，所提出的系统具有三个显着优点：首先，它是无透镜的，因此可以最大限度地减少硬件要求，并且更容易实现。其次，所提出的系统除了相位码之外还使用波长和位置参数作为附加密钥，从而实现更高的安全性。最后，加密的数据可以直接通过通信线路传输，然后在接收器处用正确的波长和位置参数进行解密。还讨论了所提出系统的应用和实施注意事项。
A lensless optical security system based on computer generated phase only masks is proposed in the present paper. These masks are located at determined positions along the direction of propagation so as to decrypt the target image. These positions coordinates are used as encoding parameters as well as the wavelength in the encryption process. Compared with previous studies, the proposed system has three significant advantages: first, it is lensless and therefore can minimize the hardware requirement and is much easier to implement. Second, the proposed system uses the wavelength and the position parameters besides the phase codes as additional keys and consequently achieves much higher security. Finally, the encrypted data can be directly transmitted via communication lines and then decrypted with the correct wavelength and the position parameters at the receiver. Applications and implementation considerations of the proposed system are also discussed.