Kim Hyun, Kim Do-Hyung, Lee Yeon
Opt Express. 2004 Oct 4;12(20):4912-21. doi: 10.1364/opex.12.004912.
We present a simple technique to encrypt a digital hologram of a three-dimensional (3-D) object into a stationary white noise by use of virtual optics and then to decrypt it digitally. In this technique the digital hologram is encrypted by our attaching a computer-generated random phase key to it and then forcing them to Fresnel propagate to an arbitrary plane with an illuminating plane wave of a given wavelength. It is shown in experiments that the proposed system is robust to blind decryptions without knowing the correct propagation distance, wavelength, and phase key used in the encryption. Signal-to-noise ratio (SNR) and mean-square-error (MSE) of the reconstructed 3-D object are calculated for various decryption distances and wavelengths, and partial use of the correct phase key.
我们提出了一种简单的技术，通过使用虚拟光学将三维（3-D）物体的数字全息图加密成静止白噪声，然后进行数字解密。在该技术中，通过附加计算机生成的随机相位密钥对数字全息图进行加密，然后用给定波长的照明平面波迫使它们菲涅耳传播到任意平面。实验表明，所提出的系统对于在不知道加密中使用的正确传播距离、波长和相位密钥的情况下进行盲解密具有鲁棒性。针对各种解密距离、波长以及部分使用正确相位密钥的情况，计算了重建三维物体的信噪比（SNR）和均方误差（MSE）。
