Digital image watermarking for printed and scanned documents
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Publication Details
Author list: Thongkor K., Amornraksa T.
Publisher: Society of Photo-optical Instrumentation Engineers
Publication year: 2017
Volume number: 10420
ISBN: 9781510613041
ISSN: 0277-786X
eISSN: 1996-756X
Languages: English-Great Britain (EN-GB)
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Abstract
We present a spatial domain image watermarking for printed and scanned documents. In the watermark embedding process, a watermark image is embedded into the blue color component of a white color image. The result is overlaid with information, and printed out on a piece of paper. In the watermark extraction process, a printed document is first scanned back to obtain an electronic copy. Geometric distortions from the printing and scanning processes are then reduced by an image registration technique based on affine transformation. All watermarked components are used to determine a threshold for watermark bits extraction. The performance of the proposed watermarking method was investigated based on different scanning resolutions, printing quality modes, and printable materials. Watermark extraction from ripped, crumpled, and wet documents was also investigated. The promising results demonstrate the effectiveness of the proposed method. ฉ 2017 SPIE.
Keywords
printed and scanned documents, spatial domain image watermarking
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