Image processing system having color adjusting features

Details Image processing system having color adjusting features Image processing system having color adjusting features

1994-06-21

1999-08-24

Lee, Thomas D.

Facsimile and static presentation processing

Natural color facsimile

Color correction

358515, H04N 156, H04N 154

Patent

active

059431431

ABSTRACT:
An object of this invention is to improve the operability of color adjustment by using a simple hardware arrangement which performs only a matrix arithmetic operation having matrix coefficients properly determined in accordance with adjustment amounts designated from an operation unit for adjusting three variables as lightness, saturation, and hue. In the constitution of this invention, an image input unit inputs a color input signal, and a color conversion unit extracts the minimum value from the input color signal for each pixel, obtaining a difference signal of the input color signal and the extracted minimum value signal. The obtained difference signal is converted in matrix in accordance with matrix conversion coefficients generated by a matrix conversion coefficient unit in correspondence with the adjustment amounts of the adjustment items of an operation unit for adjusting three variables as lightness, hue, and saturation.

REFERENCES:
patent: 4763186 (1988-08-01), Belmares-Sarabia et al.
patent: 5012299 (1991-04-01), Sawamura et al.
patent: 5333070 (1994-07-01), Ichikawa
patent: 5333243 (1994-07-01), Best et al.
patent: 5371609 (1994-12-01), Suzuki et al.
patent: 5436739 (1995-07-01), Imao et al.
patent: 5485284 (1996-01-01), Shono et al.

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