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
Image reconstruction only by phase data in phase-shifting digital holography.
TL;DR: It is shown that reduction of the bit depth of the phase data does not seriously damage the image even down to 1 bit, and the procedure for smoothing the images that result from the data-compression methods is shown to be effective.
Journal ArticleDOI
Coded aperture correlation holography system with improved performance [Invited].
TL;DR: In this study, the numerical correlation is performed with a phase-only filter, and the phase function of the Fourier transform of the source point hologram is used as the spatial filter in the correlation process.
Journal ArticleDOI
Compressive Optical Image Encryption
TL;DR: The numerical simulations show that the proposed optical image encryption technique is effective and suitable for optical image security transmission in future all-optical networks because of the ability of completely optical implementation and substantially smaller hologram data volume.
Journal ArticleDOI
Fully phase encryption using digital holography
TL;DR: A fully phase encryption system that uses digital holography, where the input amplitude image to be encrypted is phase encoded, and either its Fourier or Fresnel transform is obtained.
Journal ArticleDOI
Full-phase photon-counting double-random-phase encryption
Adam Markman,Bahram Javidi +1 more
TL;DR: Initial computational simulations show that the full-phase PC-DRPE has the potential to require fewer photons for authentication than the amplitude-based PC-RAE, and their statistical parameters are used for authentication.
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
TL;DR: Good generalized these methods and gave elegant algorithms for which one class of applications is the calculation of Fourier series, applicable to certain problems in which one must multiply an N-vector by an N X N matrix which can be factored into m sparse matrices.
Journal ArticleDOI
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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Optical image encryption based on input plane and Fourier plane random encoding.
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