Image processor

Details Image processor Image processor

1997-03-17

1999-02-02

Boudreau, Leo H.

Facsimile and static presentation processing

Natural color facsimile

Color correction

358520, 382167, G06K 946

Patent

active

058672850

ABSTRACT:
In an image processing apparatus, a color image is read with pixels aligned along a direction to provide first color data on the color image. The first color data includes red, green and blue data at each pixel. A first operator calculates first chroma data according to the first color data. On the other hand, a phase shift device generates second color data by shifting a phase of red data and by shifting a phase of blue data in the first color data, and a second operator calculates second chroma data according to the second color data. A selector selects chroma data having a lower chroma, and a black edge of a character a the color image is discriminated according to the selected chroma data.

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patent: 5541742 (1996-07-01), Imao et al.
patent: 5557688 (1996-09-01), Nakamura

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