Image reading apparatus

Details Image reading apparatus Image reading apparatus

1995-11-13

1998-09-29

Lee, Thomas D.

Facsimile and static presentation processing

Natural color facsimile

Measuring, testing, and calibrating

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

Patent

active

058152911

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
patent: 5422739 (1995-06-01), Usami et al.

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