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
More filters
Book ChapterDOI
Image Quality Improvement of Digital Holography by Multiple Wavelengths or Multiple Holograms
TL;DR: Two methods to reduce speckle of the reconstructed image of a digital hologram based on the superposition of the reconstructing images with different wavelengths are presented.
Book ChapterDOI
Compression of Digital Holograms for Secure Three-Dimensional Image Storage and Transmission
Thomas J. Naughton,Bahram Javidi +1 more
TL;DR: Lossy quantization is combined with lossless coding techniques to quantify compression rates and these techniques are suitable for a range of secure three-dimensional object storage and transmission applications.
Journal ArticleDOI
Plaintext-related multiple-image encryption based on computational ghost imaging
TL;DR: A plaintext-related ghost imaging encryption system which can reduce the key size and ensure the security of the system was proposed in this study, which has the characteristic of strong multiple-image encryption ability, high security and enough simple structure.
Proceedings ArticleDOI
New approaches to 3D image recognition
TL;DR: In this article, a number of new optoelectronic approaches to 3D image recognition are described, which are shift-variant or shift-invariant along the optical axis.
Journal ArticleDOI
Analysis of partially occluded objects encoded in digital holograms using the Wigner distribution function
B. H. Hennelly,Jonathan Maycock,C. P. Mc Elhinney,Thomas J. Naughton,John McDonald,Bahrain Javidi +5 more
TL;DR: It is shown that by iteratively selecting different views, the original scene can be reconstructed e±ciently, and would be useful in situations where transmission of the whole digital hologram, or exhaustive reconstruction of every perspective, was not feasible.
References
More filters
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.
Related Papers (5)
Optical image encryption based on input plane and Fourier plane random encoding.
Philippe Réfrégier,Bahram Javidi +1 more
Optical encryption by double-random phase encoding in the fractional Fourier domain.
Encrypted optical memory system using three-dimensional keys in the Fresnel domain.
Osamu Matoba,Bahram Javidi +1 more