Digital Image Encryption with Discrete Fractional Transforms and Chaos: A Comparative Analysis
The fractional Fourier transform is a generalization of the ordinary Fourier transform with an order (or power) parameter 'a' The FrFT belongs to the class of time frequency representations that have been extensively used by the signal processing community (11) Abstract: Information security has been most popular and important issue in the fastest growing age of communication. Therefore various techniques for the security of image have been developed which is commonly known as image encryption techniques. Many methods have already been proposed and in this context the Fourier Transform and its different fractional orders are very recent advancements in this area. In this paper the comparative analysis is done on two methods i.e. DFrFT and DFrST with chaos function. The computer simulations are presented to compare the validity of the methods with histogram analysis between the original images and the decrypted images. The PSNR is also compared between two methods. Keywords: Image Encryption, Discrete Fractional Transform (DFrT) Discrete Fractional Fourier Transform (DFrFT) Discrete Fractional Sine Transform (DFrST),Chaos, Logistic Map.