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Image encryption and decryption using fractional Fourier transform and radial Hilbert transform

机译:使用分数阶傅里叶变换和径向希尔伯特变换的图像加密和解密

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摘要

A technique for image encryption using fractional Fourier transform (FRT) and radial Hilbert transform (RHT) is proposed. The spatial frequency spectrum of the image to be encrypted is first segregated into two parts/channels using RHT, and image subtraction technique. Each of these channels is encrypted independently using double random phase encoding in the FRT domain. The different fractional orders and random phase masks used during the process of encryption and decryption are the keys to enhance the security of the proposed system. The algorithms to implement the proposed encryption and decryption scheme are discussed, and results of digital simulation are presented.
机译:提出了一种利用分数傅里叶变换(FRT)和径向希尔伯特变换(RHT)进行图像加密的技术。首先使用RHT和图像减法技术将要加密的图像的空间频谱分为两个部分/通道。使用FRT域中的双随机相位编码对这些通道中的每个通道进行独立加密。在加密和解密过程中使用的不同分数阶和随机相位掩码是增强所提出系统安全性的关键。讨论了实现所提出的加密和解密方案的算法,并给出了数字仿真的结果。

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