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Proceedings Paper

New alteration detecting technique for printed documents using dot pattern watermarking
Author(s): Masahiko Suzaki; Yasuhiro Mitsui; Masayuki Suto
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Paper Abstract

This paper proposes a unique watermarking technique for printed documents by superposing dot pattern blocks on backgrounds of the document images. The dot pattern block contains information, but it is not visually distracting as the printed documents look as if uniform dot patterns are superposed on the background. The dots in the dot pattern block are lined up to a certain direction so that these dots generate 2-D wavelet in a scanned image of the printed documents. We have described the difference of symbols "0" and "1" as the difference of wavelet direction, and each wavelet is detected by 2-D Gabor filter, which makes the symbol detection error rate very low. In addition, accuracy of detection is not affected by format or layout of documents. Alteration detection can be achieved by embedding original document image feature into document image itself as alteration detection data. When watermark is extracted, the alteration detection data and the image feature of scanned image, are compared to determine if alterations are made or not.

Paper Details

Date Published: 20 June 2003
PDF: 12 pages
Proc. SPIE 5020, Security and Watermarking of Multimedia Contents V, (20 June 2003); doi: 10.1117/12.476848
Show Author Affiliations
Masahiko Suzaki, Oki Electric Industry Co., Ltd. (Japan)
Yasuhiro Mitsui, Oki Electric Industry Co., Ltd. (Japan)
Masayuki Suto, Oki Electric Industry Co., Ltd. (Japan)

Published in SPIE Proceedings Vol. 5020:
Security and Watermarking of Multimedia Contents V
Edward J. Delp; Ping Wah Wong, Editor(s)

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