Image reader using CCD line sensors

Details Image reader using CCD line sensors Image reader using CCD line sensors

1991-03-01

1993-10-05

Coles, Sr., Edward L.

Facsimile and static presentation processing

Natural color facsimile

Color photography previewer

358500, 358523, G03F 308

Patent

active

052510247

ABSTRACT:
An image reader using CCD line sensors which effects color correction of three color difference signals resulting from reading of a color original by the CCD line sensors. This image reader employs a plurality of color correction characteristics for enlarging the color difference signals in regions where the color difference signals are large, and limiting enlargement ratios of the color difference signals in regions where the color difference signals are small. A color correction characteristic is selected manually or in accordance with the luminance level of each pixel. Noises appearing in shadow portions are reduced by the color correction based on the limited enlargement ratios of the color difference signals effected in the regions where the color difference signals are small.

REFERENCES:
patent: 4941037 (1990-07-01), Sasaki et al.
patent: 4942462 (1990-07-01), Shiota
patent: 4992863 (1991-02-01), Moriya
patent: 5049985 (1991-09-01), Outa
patent: 5126838 (1992-06-01), Ohsawa et al.

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