Optical Image Encryption with Simplified Fractional Hartley Transform  

作　　者：李新新 赵道木 

机构地区：[1]Department of Physics, Zhejiang University, Hangzhou 310027

出　　处：《Chinese Physics Letters》2008年第7期2477-2480,共4页中国物理快报（英文版）

摘　　要：We present a new method for image encryption on the basis of simplifed fractional Hartley transform （SFRHT）. SFRHT is a real transform as Hartley transform （HT） and furthermore, superior to HT in virtue of the advantage that it can also append fractional orders as additional keys for the purpose of improving the system security to some extent. With this method, one can encrypt an image with an intensity-only medium such as a photographic film or a CCD camera by spatially incoherent or coherent illumination. The optical realization is then proposed and computer simulations are also performed to verify the feasibility of this method.We present a new method for image encryption on the basis of simplifed fractional Hartley transform （SFRHT）. SFRHT is a real transform as Hartley transform （HT） and furthermore, superior to HT in virtue of the advantage that it can also append fractional orders as additional keys for the purpose of improving the system security to some extent. With this method, one can encrypt an image with an intensity-only medium such as a photographic film or a CCD camera by spatially incoherent or coherent illumination. The optical realization is then proposed and computer simulations are also performed to verify the feasibility of this method.

关 键 词：FOURIER-TRANSFORM DIGITAL HOLOGRAPHY FRESNEL DOMAIN IMPLEMENTATION 

分 类 号：O43[机械工程—光学工程]