Image processing circuit

Details Image processing circuit Image processing circuit

1994-11-21

1999-03-02

Couso, Jose L.

Image analysis

Color image processing

382167, 358518, G06K 900

Patent

active

058781625

ABSTRACT:
An image processing circuit which adds, by means of a yellow color image data, forgery tracing information to yellow, magenta and cyan color image data obtained by reading out of an original. A tracing information adder replaces the read-out yellow color image data with a yellow color image of a higher density in a low-density area where the density of the read-out yellow color image data is equal to or below a set threshold value. In a high-density area where the density of the read-out yellow color image data exceeds the set threshold value, the tracing information is added by adding a predetermined value to the read-out yellow color image data.

REFERENCES:
patent: 5457007 (1995-10-01), Asami
patent: 5457540 (1995-10-01), Kajita
patent: 5539539 (1996-07-01), Fujimoto et al.

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