Watermarking in binary document images using fractal codes
Pattern Recognition Letters
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In this paper a novel blind method for watermarking of Farsi (Persian language) texts based on employing the existing common sloping letters is presented. The proposed method embeds the watermark data in four common sloping letters by readjusting the amount of their slopes. This approach can be categorized under character coding methods. The presented algorithm is so simple to implement and experiments have shown its higher capacity and transparency comparing to similar text watermarking methods. Noticing similarities of Arabic and Urdu characters with Farsi characters, the presented method can easily be implemented on those scripts.