球面波照明下傅里叶变换全息多图像加密方法研究

Multiple image encryption based on Fourier transform holography under spherical wave illumination

为了减少加密系统所用模板数,简化隐藏图像对解密过程的影响,采用球面波照明研究了基于傅里叶变换全息的多图像加密隐藏方法,并进行了加密、加密图像隐藏和解密的理论分析和数值模拟,加密图像和原始图像间的相关系数趋于0,宿主图像和加密图像的叠加系数ρ<0.3时,宿主图像和隐藏图像的相关系数趋于1,解密图像和原始图像间的相关系数趋于1。结果表明,该加密隐藏方法的加密、解密和隐藏效果良好。

To reduce the number of binary random phase mask used in an image encryption system and simplify the effect of hidden encryption images on decryption process,an optical multiple-image encryption and hiding scheme was put forward based on Fourier transform holography under spherical wave illumination.Theoretical analysis and numerical simulation of image encryption and hiding encryption image and image decryption were made.The results show that correlation coefficient between encryption image and original image approaches 0,correlation coefficient between host image and hiding encryption image approaches 1 when superposition coefficient ρ between host image and hiding encryption image is less than 0.3,correlation coefficient between decryption image and original image approaches 1.The encryption method can obtain good encryption effect.