Embedding robust labels into images for copyright protection
KnowRight '95 Proceedings of the conference on Intellectual property rights and new technologies
Performance comparison of two text marking methods
IEEE Journal on Selected Areas in Communications
IWDW '07 Proceedings of the 6th International Workshop on Digital Watermarking
UniSpaCh: A text-based data hiding method using Unicode space characters
Journal of Systems and Software
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In this paper we propose a multi-set modulation technique to increase the hiding capacity within a binary document image. As part of this technique we propose an Automatic Threshold Calculation and Threshold Buffering, Shifted Space Distribution and Letter Space Compensation technique. The Automatic Threshold Calculation is used to distinguish word spaces from letter spaces. The Threshold Buffering is used to reduce the chance of misinterpretation of spaces during the detection phase, following printing and scanning. The Shifted Space Distribution and Letter Space Compensation techniques robustly embed a watermark into the binary document image. The Automatic Threshold Calculation has been shown to be successful in identifying word spaces for different types of fonts and font sizes. The combination of the Shifted Space Distribution, Letter Space Compensation and Threshold Buffering techniques have been shown to create a watermark that is robust to printing and scanning.