Optical Image Encryption Using Double Random Phase Encoding in a 4f Lens System
A 4f optical system consists of two lenses separated by a distance equal to four times their focal length. When placed in a coherent light path, it performs two consecutive Fourier transforms, making it a ideal platform for spatial‐domain and frequency‐domain phase modulation. Double random phase encoding (DRPE) exploits this architecture by ap ...
Posted on Fri, 08 May 2026 06:31:00 +0000 by reckdan