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
Error analysis for a lens-less in-line digital holographic complex information security system based on double random phase encoding
TL;DR: The error tolerance properties of double random phase encoding implemented in the case of a lens-less whole (both amplitude and phase) information security system based on in-line digital holography based on a generalized position-phase-shifting in- line digital holographic method are studied.
Book ChapterDOI
Three-Dimensional Mapping and Ranging of Objects Using Speckle Pattern Analysis
Vicente Micó,Zeev Zalevsky,Javier Garcia,Mina Teicher,Yevgeny Beiderman,Estela Valero,Pascuala García-Martínez,Carlos Ferreira +7 more
TL;DR: In this article, the authors present two approaches for 3D object shape measurement and range estimation based on digital image processing of speckle patterns, which are retrieved by projecting, through a ground glass diffuser and on the camera for a transmissive and reflective configuration, respectively.
Journal ArticleDOI
Dynamic deformation measurement of dual-wavelength arbitrary phase-shifting digital holography with automatic phase-shift detection
Peng Xia,Shien Ri,Qinghua Wang +2 more
TL;DR: In this paper, a dual-wavelength arbitrary phase-shifting digital holography with automatic phase shift detection is proposed, which can achieve simultaneous phase shifting of the reference beams of two wavelengths, which substantially reduces recording time and does not require excessive phase shift device precision.
Shot noise, refractive index tomography and aberrations estimation in digital holographic microscopy
TL;DR: In this article, the effect of shot noise on the phase image accuracy, the use of DHM in micro-tomography and in aberrations evaluation of a microscope objective (MO) is discussed.
Journal ArticleDOI
Indirect synthesis of interference terms in digital holography
Nobukazu Yoshikawa,Shinya Ogami +1 more
TL;DR: Experimental results of the indirect synthesis of the interference term corresponding to the lensless Fourier hologram using the Fresnel hologram are presented.
References
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Journal ArticleDOI
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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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Optical image encryption based on input plane and Fourier plane random encoding.
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