The real-value encryption for the full phase image
Chang Hong-sen · Jiguang zazhi · 2004
A real-value encryption and decryption method is proposed for the optical image security system.A full-phase image to be encrypted together with a random phase mask is Fourier transformed and real part of the result is used as an encrypted image.The addition of encrypted image and the Fourier transformed of the random phase is inverse-Fourier transformed.The intensity values of the inverse-Fourier transformed image is adjusted.It gives the exact original image.The method of encryption and decryption is simply performed and encrypted image is real-valued,so it is convenient for print or display on computer.