Digital Hologram Encryption Algorithm using Fresnel Diffraction

Cascaded Fresnel digital hologram and its application to watermarking

A cascaded Fresnel digital hologram (CFDH) is proposed, together with its mathematical derivation. Its application to watermarking has been demonstrated by a simulation procedure, in which the watermark image to be hidden is encoded into the phase of the host image. The watermark image can be deciphered by the CFDH setup, the reconstructed image shows good quality and the error is almost close ...

Computer-generated hologram calculation using layered stereogram based inverse Fresnel diffraction

We propose an efficient algorithm using layered stereogram based inverse Fresnel diffraction for 3-D computer-generated holograms. Experiments demonstrate the proposed method can reconstruct quality 3-D images with accurate depth cues. OCIS codes: (090.1760) Computer holography; (090.2870) Holographic display.

Novel method for converting digital Fresnel hologram to phase-only hologram based on bidirectional error diffusion.

We report a novel and fast method for converting a digital, complex Fresnel hologram into a phase-only hologram. Briefly, the pixels in the complex hologram are scanned sequentially in a row by row manner. The odd and even rows are scanned from opposite directions, constituting to a bidirectional error diffusion process. The magnitude of each visited pixel is forced to be a constant value, whil...

FINCH: Fresnel Incoherent Correlation Hologram

Complex Fresnel hologram display using a single SLM.

We propose a novel optical method to display a complex Fresnel hologram using a single spatial light modulator (SLM). The method consists of a standard coherent image processing system with a sinusoidal grating at the Fourier plane. Two or three position-shifted amplitude holograms displayed at the input plane of the processing system can be coupled via the grating and will be precisely overlap...