Image forming apparatus

Details Image forming apparatus Image forming apparatus

2006-03-21

2006-03-21

Williams, Kimberly (Department: 2626)

Facsimile and static presentation processing

Facsimile

Picture signal generator

C358S001200, C358S001900, C358S501000, C382S168000, C382S271000, C382S169000

Reexamination Certificate

active

07016086

ABSTRACT:
Image data provided from a scanner is simultaneously supplied to page memory and a reference value calculating section. The reference value calculating section creates a density histogram of the document image on the basis of image data corresponding to a predetermined number of image lines and calculates a set of correction reference values for pixel density correction using the density histogram. A range correcting section corrects pixel density indicated by the image data on all the image data read out from the page memory by using the set of correction reference values. The predetermined number of image lines is a fraction of all the image lines of the document image read by the scanner.

REFERENCES:
patent: 5724444 (1998-03-01), Yamanishi
patent: 6047092 (2000-04-01), Moro
patent: 6249298 (2001-06-01), Castegnier et al.
patent: 8-317149 (1996-11-01), None

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