Browse Prior Art Database

Image Color Comparator

IP.com Disclosure Number: IPCOM000094332D
Original Publication Date: 1966-Sep-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 35K

Publishing Venue

IBM

Related People

Seesing, GH: AUTHOR

Abstract

This method of color comparison eliminates the need to physically view a sample by providing a set of tricolor reference voltages for recognizing the desired color. A color simulator is provided which is operable so that the amplitude and ratios of its three reference voltage outputs reflect desired level of hue, saturation, and brightness for a selected color.

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Image Color Comparator

This method of color comparison eliminates the need to physically view a sample by providing a set of tricolor reference voltages for recognizing the desired color. A color simulator is provided which is operable so that the amplitude and ratios of its three reference voltage outputs reflect desired level of hue, saturation, and brightness for a selected color.

When it is desired to sense lines of one particular color on a multicolor printed circuit drawing, a tricolor scanner comprised of red, blue and green filters and associated photocells is focused on the drawing. The three scanner signals, representing the distribution of red, blue and green present in the scanned image color, are fed to the red, blue and green comparators. The simulator provides that particular combination of red, blue and green reference voltages which characterize the selected color on the input document and transmits the voltages to the comparators.

Each compare circuit generates a logical 1 whenever the scanner and simulator inputs are equal in amplitude. The final three-way And-gate signifies that the desired line color on the original document is recognized when all three comparators have coincident inputs.

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