Journal ArticleDOI
Encrypting three-dimensional information with digital holography
Enrique Tajahuerce,Bahram Javidi +1 more
TLDR
A method for optical encryption of three-dimensional (3D) information by use of digital holography using a phase-shifting interferometer and an intensity-recording device.Abstract:
A method for optical encryption of three-dimensional (3D) information by use of digital holography is presented. A phase-shifting interferometer records the phase and amplitude information generated by a 3D object at a plane located in the Fresnel diffraction region with an intensity-recording device. Encryption is performed optically by use of the Fresnel diffraction pattern of a random phase code. Images of the 3D object with different perspectives and focused at different planes can be generated digital or optically after decryption with the proper key. Experimental results are presented.read more
Citations
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Journal ArticleDOI
Focal Image Plane Detection Based on Central Coordinate Point Spectral Value in Off-Axis Digital Particle Holography
Peizhen Qiu,Lijun Deng,Wenhui Lu +2 more
TL;DR: In this paper, a method to detect the focal image plane from a single off-axis digital particle hologram is proposed, which utilizes the central coordinate point spectral value of the reconstructed particle image as focusing criterion.
Journal ArticleDOI
A methodology for the digital reconstruction of an interferogram, a schlieren image, or a shadowgram from a single digital holographic recording
TL;DR: The resolving power of holographic reconstruction methodology proposed is determined by the of hologram for detecting the interferometric phase, and the scope of the technique is experimentally tested for a steady-state phase object.
Proceedings ArticleDOI
Phase imaging in-line digital holography with random phase modulation
TL;DR: In this article, a random phase modulation was proposed for in-line digital holography, which is inspired by double-random phase-encryption, and the difference between the proposed method and the double random phaseencryption is described.
Proceedings ArticleDOI
Multi-image hiding method based on polarization multiplexing digital holography
TL;DR: In this paper, a novel algorithm of multi-image hiding method is presented based on polarization multiplexing digital holography (PMDH), where four beams, two p-polarized beams and two spolarised beams, are formed by two Polarization Beam Splitters (PBSs) in the Mach-Zehnder interferometer.
Multiple Phase Three-dimensional Scenes Encryption Using Computer Generated Holograms
TL;DR: A comparison between Single and Multiple phases encoding for binary and gray scale images is performed and results show that multiple phase encoding is more secure than single phase encoding.
References
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Journal ArticleDOI
An algorithm for the machine calculation of complex Fourier series
J.W. Cooley,John W. Tukey +1 more
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Optical image encryption based on input plane and Fourier plane random encoding.
Philippe Réfrégier,Bahram Javidi +1 more
TL;DR: A new optical encoding method of images for security applications is proposed and it is shown that the encoding converts the input signal to stationary white noise and that the reconstruction method is robust.
Journal ArticleDOI
Phase-shifting digital holography
Ichirou Yamaguchi,Tong Zhang +1 more
TL;DR: A new method is proposed in which the distribution of complex amplitude at a plane is measured by phase-shifting interferometry and then Fresnel transformed by a digital computer, which can reconstruct an arbitrary cross section of a three-dimensional object with higher image quality and a wider viewing angle than from conventional digital holography using an off-axis configuration.
Journal ArticleDOI
Direct recording of holograms by a CCD target and numerical reconstruction.
Ulf Schnars,W. Jüptner +1 more
TL;DR: The principle of recording holograms directly on a CCD target is described and a real image of the object is reconstructed from the digitally sampled hologram by means of numerical methods.
Journal Article
Digital wavefront measuring interferometer for testing optical surfaces and lenses
TL;DR: In this article, a self-scanned 1024 element photodiode array and a minicomputer are used to measure the phase (wavefront) in the interference pattern of an interferometer to lambda/100.
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