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Artificial Generation of Grey Scales in Binary Image Devices

IP.com Disclosure Number: IPCOM000075364D
Original Publication Date: 1971-Sep-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 25K

Publishing Venue

IBM

Related People

Pricer, WD: AUTHOR

Abstract

A wide variety of technologies capable of producing images either visual or printed are inherently binary. That is they produce either light or dark with no "grey scale" in between. This technique artificially produces what appears to the eye to be a continuous spectrum of grey tones in-between.

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Artificial Generation of Grey Scales in Binary Image Devices

A wide variety of technologies capable of producing images either visual or printed are inherently binary. That is they produce either light or dark with no "grey scale" in between. This technique artificially produces what appears to the eye to be a continuous spectrum of grey tones in-between.

The input image is scanned in TV raster fashion. The video signal is obtained by clipping with semiconductor diodes (at proper amplitude) the output of any conventional white noise source. This has the property of not clipping the probability distribution, but rather redistributing it (see above). The resultant signal is set by proper amplification to just match these two limits.

The output of the high-gain comparing amplifier is fed either to a digitizing circuit or directly to the binary-imaging devices. The resultant image viewed at a distance appears to have grey values and is free of any contour effects.

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