System and method of determining a reference value for the inten

Details System and method of determining a reference value for the inten System and method of determining a reference value for the inten

1992-07-24

1995-03-21

Ro, Bentsu

Facsimile and static presentation processing

Natural color facsimile

Color separation

358515, 358518, H04N 140, H04N 146

Patent

active

054001536

ABSTRACT:
A method and system of determining a reference value for the intensity associated with a color indication variable and obtained by scanning an original with a color scanning unit the color scanning unit being adapted to scan the original point-by-point, the method comprising determining a locally valid reference value for each scanned point and for each color indication variable, provided the intensity value related thereto deviates from a defined standard value by less than a preset value, by adapting the then locally available reference value by using a fraction of the value representing the intensity in the case of the color indication variable concerned. For example, a white reference value (white point) can be determined for an original point by point, with the result that weak color tones which are perceived as white are also regarded as white, while in addition small variations in these weak color tones (e.g. uneven yellowing) are also noted as white.

REFERENCES:
patent: 4001500 (1977-01-01), Lavery et al.
patent: 4578711 (1986-03-01), White et al.
patent: 4679073 (1987-07-01), Hayashi
patent: 4870501 (1989-09-01), Yoshida
patent: 4975768 (1990-12-01), Takaraga
patent: 4987485 (1991-01-01), Hirota

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