Browse Prior Art Database

Analog Image Synthesizer

IP.com Disclosure Number: IPCOM000073813D
Original Publication Date: 1971-Feb-01
Included in the Prior Art Database: 2005-Feb-23
Document File: 2 page(s) / 28K

Publishing Venue

IBM

Related People

Barrekette, ES: AUTHOR [+2]

Abstract

Image synthesis is described for: recording of a composite image from a multiplicity of images with spatial filtering; synthesizing of images from partial records of a synthetic aperture optical telescope; and providing noise reduction and image averaging. Illustratively, synthesis of simultaneous seismographic signals and detection of small changes in transparencies are possible.

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Analog Image Synthesizer

Image synthesis is described for: recording of a composite image from a multiplicity of images with spatial filtering; synthesizing of images from partial records of a synthetic aperture optical telescope; and providing noise reduction and image averaging. Illustratively, synthesis of simultaneous seismographic signals and detection of small changes in transparencies are possible.

A synthetic aperture telescope composite image has been heretofore provided for images with frequencies throughout the electromagnetic spectrum. It has been determined therefor that for a set of k transparencies, each with an opacity distribution I(i) (x,y), where I(i) is bandlimited, the composite image contains only a certain range of spatial frequencies associated with I(i), the rest of I(i) spectrum being rejected. Such an operation can be performed by a digital computer which first takes
T(i) (gamma,xi) = integral integral I(i) (xgamma + xi y)e (-)jk(xgamma + xiy) dxdy

= T(io) (gamma,xi) + T(i)/1/ (gamma,xi). The T(io) part of Fourier transform is rejected while T(i)/1/ is stored for all
i. The final opacity distribution is obtained by inversion of this sum of T(i)'s. I(x,y) = integral integral sigma /k/ T(i)

(gamma, xi)e/jk/(gamma x + xi)

i=1.

A modified analog Fourier processor or analog image synthesizer is shown. The set of transparencies I for constructing the composite picture at 6 is placed in the liquid gate 1 and illuminated by the parallel beam of...