Color image cryptosystem using Fresnel diffraction and phase modulation in an expanded fractional Fourier transform domain. (3rd April 2018)

• Record Type: Journal Article
• Authors: Chen, Hang; Liu, Zhengjun; Chen, Qi; Blondel, Walter; Varis, Pierre
• Is Part Of: Laser physics. Volume 28:Number 5(2018:May)
• Publication Date: 2018-04-03
• Subjects: Fresnel diffraction -- optical image encryption -- image transmission and formation -- nonlinear optics; Lasers -- Periodicals; 621.36605
• DOI: 10.1088/1555-6611/aab240
• Languages: English
• ISSNs: 1054-660X

Abstract

Abstract: In this letter, what we believe is a new technique for optical color image encryption by using Fresnel diffraction and a phase modulation in an extended fractional Fourier transform domain is proposed. Different from the RGB component separation based method, the color image is converted into one component by improved Chirikov mapping. The encryption system is addressed with Fresnel diffraction and phase modulation. A pair of lenses is placed into the fractional Fourier transform system for the modulation of beam propagation. The structure parameters of the optical system and parameters in Chirikov mapping serve as extra keys. Some numerical simulations are given to test the validity of the proposed cryptosystem.