Image processing apparatus for determining copying-inhibited doc

Details Image processing apparatus for determining copying-inhibited doc Image processing apparatus for determining copying-inhibited doc

1995-08-31

1998-07-14

Couso, Yon J.

Image analysis

Applications

Reading paper currency

382195, 382274, 399366, 283 72, G06K 946

Patent

active

057816530

ABSTRACT:
There is provided by the present invention an image processing apparatus which accurately determines a copying-inhibited document prepared by using paper with a copying-inhibited pattern printed or copied on the entire surface thereof by checking for each pixel data constituting image data whether an object pixel has a black peak density coincident to that of a copying-inhibited document, whether a white area having a specified size exists at a peripheral area at a distance therefrom, whether the object pixel is a screen tone graph or character area pixel, or an illegal area pixel or not.

REFERENCES:
patent: 5309245 (1994-05-01), Hayashi et al.
patent: 5363454 (1994-11-01), Udagawa et al.
patent: 5426710 (1995-06-01), Suzuki et al.
patent: 5483602 (1996-01-01), Stenzel et al.
patent: 5583614 (1996-12-01), Hasuo et al.

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