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首页> 外文会议>MSEC2011;International conference on multimedia, software engineering and computing >A No Interference Method for Image Encryption and Decryption by an Optical System of a Fractional Fourier Transformation and a Fourier Transformation
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A No Interference Method for Image Encryption and Decryption by an Optical System of a Fractional Fourier Transformation and a Fourier Transformation

机译：分数阶傅里叶变换和傅里叶变换光学系统进行图像加密和解密的无干扰方法

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摘要

A no interference encryption and decryption for a digital image is presented in this paper. The encrypting process consists of a fractional Fourier transformation and a Fourier transformation. A digital image is first coded with a random phase plate, then it takes a fractional Fourier transformation. The transformed field function is expanded 4 times and coded with another random phase mask. Meanwhile the system takes a Fourier transformation. The real part of the transformed function is taken as an encrypted image. For the decryption of the digital image, first the encrypted image undergoes an inverse Fourier transformation. Then the upper left corner of the transformed function is cut off. At last the cut-off function takes an inverse fractional Fourier transformation. The original digital image can be extracted from the final transformed function. Compared with optical holography, an interference process is not needed in our program. This will reduce the complexity of optical system.
机译：本文还提供了对数字图像的干扰加密和解密。加密过程包括分数傅里叶变换和傅里叶变换。首先用随机相板编码数字图像，然后采用分数傅里叶变换。变换的字段功能扩展4次并与另一个随机相位掩模进行编码。同时系统采用傅里叶变换。转换功能的实数被拍摄为加密图像。为了解密数字图像，首先加密图像经历逆傅里叶变换。然后切断转换功能的左上角。最后，截止功能呈现逆分傅里叶变换。可以从最终变换功能中提取原始数字图像。与光学全息术相比，我们的程序中不需要干扰过程。这将降低光学系统的复杂性。

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