Image processing system for performing color image data calibrat

Details Image processing system for performing color image data calibrat Image processing system for performing color image data calibrat

1992-12-30

1996-01-16

Rogers, Scott A.

Facsimile and static presentation processing

Natural color facsimile

Measuring, testing, and calibrating

358518, 358519, 358520, 358523, 382167, H04N 156, H04N 160

Patent

active

054852846

ABSTRACT:
An image reading apparatus measures, color by color, an average transmission-density signal based upon image information obtained from a color original through which light is transmitted, converts the measured average transmission-density signal of every color into a subject-lightness signal of every color, and effects a conversion into a reference color stimulus signal, which is indicated by the apex of a triangle substantially circumscribed by a spectrum locus of a predetermined chromaticity diagram, based upon the converted subject-lightness signal of every color.

REFERENCES:
patent: 4751535 (1988-06-01), Myers
patent: 4941038 (1990-07-01), Walowit

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