Over the years extensive studies have been carried out to apply coherent optics methods in
real-time communications and image transmission. This is especially true when a large …

A novel fast double-phase retrieval algorithm for lensless optical security systems based on
the Fresnel domain is presented in this paper. Two phase-only masks are efficiently …

An optical image watermarking scheme using fractional Fourier transform is proposed. The
watermark is encrypted using double random fractional order Fourier domain encoding …

In this paper, a hierarchical encrypted image watermarking technique based on a fractional
domain random phase encoding method is proposed. Multiple watermarks encrypted at …

A system of two separated computer-generated holograms termed cascaded Fresnel digital
holography (CFDH) is proposed and its application to hiding information is demonstrated by …

An optical security system based on a correlation between two separate binary computer-
generated holograms has been developed and experimentally tested. The two holograms …

A novel and efficient algorithm based on a modified Gerchberg–Saxton algorithm (MGSA) in
the Fresnel domain is presented, together with mathematical derivation, and two pure phase …

A robust lensless optical data embedding system using both the computer-generated
concealogram and the digital Fresnel hologram (DFH) is proposed. The concealogram and …

A cascaded Fresnel digital hologram (CFDH) is proposed, together with its mathematical
derivation. Its application to watermarking has been demonstrated by a simulation …

In this paper, we propose an optical image watermarking scheme using the fractional
Fourier transform. A two-dimensional watermark is encrypted using a double random …