Stock material or miscellaneous articles – Structurally defined web or sheet – Discontinuous or differential coating – impregnation or bond
Patent
1976-08-23
1980-06-10
Wintercorn, Richard A.
Stock material or miscellaneous articles
Structurally defined web or sheet
Discontinuous or differential coating, impregnation or bond
355 77, 428 29, 428409, 428542, 350162SF, G03B 2732
Patent
active
042073707
ABSTRACT:
A method of making multilevel equidensity contour mappings and pseudo-colored versions of a photograph. First a half-tone transparency of the photograph is made by the method described in copending patent application entitled "Method of Making Half-Tone Screens", Ser. No. 708,539 filed 26 July, 1976 by Liu, now abandoned. The half-tone photograph transparency is placed at the object plane of a first lens. A spatially filtered collimated light beam is directed through the transparency and the lens such that a multitude of diffraction orders appear in the focal plane of the lens. A particular non-zero order of diffraction is singled out by placing a thin slit spatial filter at the Fourier plane of the lens. Reimaging of the diffraction order by another lens produces a filtered image which contains multilevel equidensity contours of the original photographic image. In one embodiment the light beam is generated by lasers of different wavelengths. A colored version of the photograph results from the mixing of high-diffraction order outputs.
REFERENCES:
patent: 3586434 (1971-06-01), Mueller
patent: 3748019 (1973-07-01), Bestenreiner et al.
patent: 3809478 (1974-05-01), Talbot
patent: 3829688 (1974-08-01), Barrett
patent: 4019817 (1977-04-01), Matsumoto
Aine Harry E.
Lowhurst Harvey G.
Lumin Inc.
Wintercorn Richard A.
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