We present an optical encryption scheme for hyperspectral images using an improved binary tree structure (IBTS) and phase-truncated discrete multiple-parameter fractional Fourier transform (PTdmpFrFT). In the IBTS, the encryption modules based on the phase-truncated fractional Fourier transform represented the branch nodes, while the hyperspectral bands of the plain images were considered as leaf nodes. All pairs of bands were encoded into intermediate data using the IBTS, with subsequent encryption into asymmetric ciphertexts using the PTdmpFrFT. The proposed approach generated different pairs of bands with different secret keys, and encryption and decryption paths. Compared with state-of-the-art optical hyperspectral encryption methods, our approach not only achieved superior encryption security but also reduced the computation and storage requirements of the encrypted data. The original hyperspectral image information could be successfully decrypted only when using all the co...

中文翻译：

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使用改进的二叉树结构和截断的离散多参数分数阶傅里叶变换对高光谱图像进行光学加密

我们提出了一种使用改进的二叉树结构（IBTS）和相位截断的离散多参数分数阶傅里叶变换（PTdmpFrFT）的高光谱图像光学加密方案。在IBTS中，基于相位截断的分数阶Fourier变换的加密模块表示分支节点，而将普通图像的高光谱带视为叶节点。使用IBTS将所有频带对编码为中间数据，然后使用PTdmpFrFT将其加密为非对称密文。所提出的方法产生具有不同秘密密钥，加密和解密路径的不同频带对。与最新的光学高光谱加密方法相比，我们的方法不仅实现了卓越的加密安全性，还降低了加密数据的计算和存储要求。仅当使用所有组合图像时，原始高光谱图像信息才能被成功解密。