Patent
Incoherent optical heterodyne Fourier transformer
TLDR
In this paper, an apparatus for performing an incoherent optical Fourier transform is presented, which includes a source of incoherent light, means for generating and phase modulating a first zone plate, a second zone plate and means for filtering the output signal.Abstract:
An apparatus for performing an incoherent optical Fourier transform inclu a source of incoherent light, means for generating and phase modulating a first zone plate, a second zone plate, means for detecting incoherent light processed by the apparatus, and means for filtering the output signal, thereby discriminating between the Fourier transform signal and background constant or bias signals. A method for performing incoherent optical Fourier transform is also disclosed.read more
Citations
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Patent
Optical correlator using electronic image preprocessing
TL;DR: In this paper, an optical processing system uses spatial filtering to recognize two-dimensional functions and images, which are processed by edge enhancement techniques or by applying a curvature function, and displayed on a narrow-band-phosphor cathode ray tube or television monitor.
Patent
Monitoring distance variations
TL;DR: In this paper, the authors present a method for monitoring variations in the distance between an object and a datum, comprising of a light source, an astigmatic system for projecting an image of the light source onto the object, and an image shape detector for detecting changes of shape of the image on the object due to the variation in the distances between the object and the data.
Patent
Incoherent optical processor
Anthony M. Tai,Carl C. Aleksoff +1 more
TL;DR: In this paper, an optical signal processor operating on interferometric principles serves to perform real time Fourier transformations on the intensity distribution of one-dimensional incoherent input light sources.
Patent
Multiple-clock controlled spatial light modulator
TL;DR: In this paper, an optical processor using an electrical-signal-to-light modulator is used to improve the SNR of a SAR radar system using a display sampling rate that is low by comparison with the signal sampling rate or the highest frequency of interest.
Patent
Optical Gaussian convolvers
TL;DR: In this paper, a variable Gaussian convolution of an optical image is performed using a transparency, a focusing lens, a TV camera and a mechanism which moves the camera to variable positions.
References
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Geometrical transformations in optics
TL;DR: In this paper, the authors introduce phase filters having a predetermined phase function into optical coherent systems in such a manner that the local phase variations influence light from local object areas, where the object distribution is multiplied by the phase function so that its spectrum at the frequency plane constitutes the desired transformation.
Patent
Fourier-transform holography by pseudo-random phase shifting
TL;DR: In this paper, a phase mask comprised of a rectangular array of phase shifting areas arranged in a pseudo-random pattern is illuminated with a beam of electromagnetic radiation, and the array of pseudorandomly phase shifted beams is focused on a Fourier transform plane on which the power spectrum of the beams distributes in two orthogonal directions from its center maxima.
Patent
Image processing system using incoherent radiation and spatial filter hologram
TL;DR: In this article, a linear optical processing system in which a spatial filter in the form of a Fourier transform hologram is included with a lens for processing incoherent electromagnetic radiation is presented.
Patent
Optical detection of geometric configurations
George B. Parrent,John H. Ward +1 more
TL;DR: In this article, an optical technique for retrieving images of geometric shapes from a cluttered background in a photographic record by means of amplitude and phase filters configured according to the particular shape sought to be retrieved.
Patent
Device for producing identifiable sine and cosine(fourier)transforms of input signals by means of noncoherent optics
TL;DR: In this paper, the system is designed to operate as close to the GEOMETRICAL OPTICS LIMIT as is physically possible, and the system operates in a two-dimensional space.