Detecting documents forged by printing and copying

Classical ink stamps and seals used for authentication of a document content have become relatively easy to forge by the scan&print technique since the technology is available to general public. For environments where a huge volume of documents is processed, an automatic system for verification

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that centroid detection performs remarkably well on line shifts even in the presence of severe distortions introduced by printing, photocopying, scanning, and facsimile transmission. Index Terms — Centroid detection, centroid noise, document marking, image processing copyright, text watermarking. I.

of copyrighted line drawings. Experimental results show that the proposed method not only performs good for detecting printed copies of line drawings, but also has effectiveness on the detection of handwritten ones, even if partial copies are embedded in complex backgrounds. 1.

This paper presents a content-based copy detection (CBCD) technologies demonstrator. It is composed mainly of a graphical user interface connected to two existing CBCD systems (developed by INRIA and INA), one for still images and one for videos. The graphical interface allows the user to either

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. • Users may download and print one copy of any publication from the public portal for the purpose of private study or research. • You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication