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Real Time Analyzer of Tricolor Images

IP.com Disclosure Number: IPCOM000094333D
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 color scanning system provides for accurate recognition of any selected color from a multicolored image. The output of a tricolor scanner is analyzed directly in terms of the three characteristics of a color, that is, hue, saturation, and brightness. Because each characteristic is monitored separately, completely independent tolerances can be placed on the evaluation of any one or all of these three basic qualities.

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Real Time Analyzer of Tricolor Images

This color scanning system provides for accurate recognition of any selected color from a multicolored image. The output of a tricolor scanner is analyzed directly in terms of the three characteristics of a color, that is, hue, saturation, and brightness. Because each characteristic is monitored separately, completely independent tolerances can be placed on the evaluation of any one or all of these three basic qualities.

The brightness level of a given image color from the tricolor scanner is monitored in the brightness comparator using the analog sum of the individual tricolor outputs as an indication of image intensity. Suitable adjustable circuitry checks for an in tolerance image brightness level. When this condition exists a logical 1 is fed to the recognition gate circuit.

Indications of hue and saturation are extracted from the scanner outputs as ratios in the hue control and the saturation control. These ratios become deflection amplifier inputs and control the angular displacement of a beam on the screen of a three-plate CRT. The image qualities of hue and saturation are each displayed as rotating vectors and are subsequently digitized using the rotatable opaque masks having a variable width transparent wedge shaped opening. The rotation angle of each mask corresponds to a preset nominal value of hue or saturation. The angular width of the transparent wedge determines the tolerances within which a given characteristi...