Image security based on iterative random phase encoding in expanded fractional Fourier transform domains

Image security based on iterative random phase encoding in expanded fractional Fourier transform domains
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基于扩展分数傅立叶变换域迭代随机相位编码的图像安全

DOI:
10.1016/j.optlaseng.2017.12.007
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发表时间:
2018-06
影响因子:
4.6
通讯作者:
Shutian Liu
Shutian Liu
中科院分区:
工程技术2区
文献类型:
--
作者:
Zhengjun Liu;Hang Chen;Walter Blondel;Zhenmin Shen;Shutian Liu

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提出了一种新的基于扩展分数傅立叶变换的图像加密方法,并用一对透镜实现。在这里,两个透镜的中心在光学系统的轴线截面处分开。加密系统采用菲涅耳衍射和位相调制进行信息传输的计算。利用与变换单元的迭代过程隐藏秘密图像。镜片电池的结构参数可以用作额外的钥匙。从理论上和数字上分析了加密方法的性能。结果表明,通过增加密钥,该算法的安全性得到了显著的提高。
A novel image encryption method is proposed by using the expanded fractional Fourier transform, which is implemented with a pair of lenses. Here the centers of two lenses are separated at the cross section of axis in optical system. The encryption system is addressed with Fresnel diffraction and phase modulation for the calculation of information transmission. The iterative process with the transform unit is utilized for hiding secret image. The structure parameters of a battery of lenses can be used for additional keys. The performance of encryption method is analyzed theoretically and digitally. The results show that the security of this algorithm is enhanced markedly by the added keys.
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