Ground fog and ground removing system for image forming apparatu

Details Ground fog and ground removing system for image forming apparatu Ground fog and ground removing system for image forming apparatu

1992-04-08

1993-09-14

Coles, Sr., Edward L.

Facsimile and static presentation processing

Natural color facsimile

Color separation

358518, H04N 146

Patent

active

052454177

ABSTRACT:
A ground detection means 10 for detecting the ground level of a document and a data correction means 11 for calculating correction data based on the detected ground level are provided. The ground level of the document is detected by prescanning and the correction data is calculated therefrom so that parameters of color conversion means 2, 3 are changed by the correction data. The correction data is set by approximating the detected ground level with a linear function. As a result of the above construction, the correction data is generated easily to thereby remove ground fog and exclude back-side images of the document. In addition, if the ground level is detected by a lightness signal L* and corrected by the lightness signal L* or a color-separated signal BGR, the correction can be achieved by correcting the parameters of a matrix that converts the color-separated signals B, G, R to a system value (L*a*b*) signal.

REFERENCES:
patent: 4977448 (1990-12-01), Murata

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