Image processing with anti-forgery provision

Details Image processing with anti-forgery provision Image processing with anti-forgery provision

1993-02-24

1995-05-23

Smith, Matthew S.

Photocopying

Contact printing

Light boxes

283901, 283902, 355133, G03G 2100

Patent

active

054186021

ABSTRACT:
A discriminating circuit discriminates the degree of similarity between an image represented by an input image signal and a predetermined specific image. A CPU outputs a pattern-level selecting signal based upon the results of discrimination performed by the discriminating circuit. A pattern adding circuit modulates an internally stored specific pattern in accordance with an added-color designating signal and pattern-level selecting signal produced by the CPU, and adds the modulated specific pattern to the image signal. As a result, a pattern specific to the apparatus is added in a reliably identifiable manner to an image output having a high probability of containing the specific original. In the case of an image output having a low probability of containing the specific original, the specific pattern is added to this image output in such a manner that the picture quality thereof is not diminished by the added pattern.

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