Color image reading device

Patent 5767991 Issued on June 16, 1998. Estimated Expiration Date:

June 16, 2015. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

Encoding apparatus for color image data with block-by-block individual quantizing or individual encoding of luminosity, structure, and color information
Patent #: 4887151
Issued on: 12/12/1989
Inventor: Wataya

Standardized color calibration of electronic imagery
Patent #: 5157506
Issued on: 10/20/1992
Inventor: Hannah

Input scanner color mapping and input/output color gamut transformation
Patent #: 5185661
Issued on: 02/09/1993
Inventor: Ng

Color image recording device with color edit and conversion processing
Patent #: 5200832
Issued on: 04/06/1993
Inventor: Taniuchi, et al.

Color image processing with adjustment of computed recording color to match original color
Patent #: 5270808
Issued on: 12/14/1993
Inventor: Tanioka

Image recognition apparatus for judging between monochromic and color originals
Patent #: 5287204
Issued on: 02/15/1994
Inventor: Koizumi, et al.

Mono-color editing method for color picture image recording
Patent #: 5315416
Issued on: 05/24/1994
Inventor: Taniuchi, et al.

Method and apparatus for calibration of color values
Patent #: 5481380
Issued on: 01/02/1996
Inventor: Bestmann

Color image processing method and apparatus capable of adjusting the UCR ratio
Patent #: 5502579
Issued on: 03/26/1996
Inventor: Kita, et al.

Method and associated apparatus for transforming input color values in an input color space to output color values in an output color space Patent #: 5539540
Issued on: 07/23/1996
Inventor: Spaulding, et al.

Inventor

Hara, Tomoshi

Assignee

Fuji Xerox Co., Ltd.

Application

No. 423095 filed on 04/18/1995

US Classes:

358/518, Color correction358/520, Hue, saturation and luminance382/167Color correction

Examiners

Primary: Coles, Sr., Edward L.
Assistant: Nguyen, Madeleine

Attorney, Agent or Firm

Finnegan, Henderson, Farabow, Garrett & Dunner, L.L.P.

Foreign Patent References

63-111767 JP. 05/19/1988
63-208369 JP. 08/19/1988

International Class

G03F 003/08

Foreign Application Priority Data

1994-05-26 JP

Abstract

A color image reading device having a function of correcting a variation in the color separation characteristic for each device. In the color image reading device, a standard document is read to detect variations in the color separation characteristic, and on the basis of the detected values, the color separation characteristic is corrected by a color correction processing section provided at a stage after the color conversion unit. Thus, even if the color separation characteristic has a slight variation for each device, the variation can be corrected easily by reading the standard document as occasion requires.