使用计算全息进行三维信息加密的方法研究

A 3-D encryption technique using computer-generated hologram

全息加密技术作为一种特殊的加密方法被广泛应用于信息加密和防伪等领域。在全息加密过程中,光波的波长、记录距离和入射角度等参数用做加密密钥和解密密钥被人们深入研究,但所加密的信息几乎都是二维信息。利用一种基于虚拟光学的对三维信息进行加密的方法,将三维物体的大小作为一个新的密钥被引入安全全息加密算法,其安全性能得到了极大提高;在此基础上提出了对再现三维图像进行客观评价的方法,即修正峰值信噪比法(PSNR,PeakSignal-to-Noise Ratio)。模拟实验证明,计算全息方法(CGH,Computer-Generated Hologram)作为一种对三维信息进行加密的方法是可行的,修正PSNR法对再现三维图像的质量进行定量分析是有效的。

The techniques of hologram for encryption and decryption have been widely researched and applied.Almost all the information of encryption is 2-D image.Parameters(wave length,recording distance,incidence angle,etc.) are regarded as the encoded keys for encryption and decryption.In the paper a novel way to encrypt 3-D information is proposed,which is based on technique of virtual optics.A new encoded key is introduced into security hologram,the size of 3-D object,which may play an important role for better protection against counterfeiting.Furthermore,a new image quality assessment is proposed to estimate the reconstruction 3-D object of CGH called Modified PSNR(peak signal-to-noise ratio).Simulation experiments show that CGH is an effective encryption technique,and Modified PSNR is a proper definite quantity analysis method for 3-D imaging.