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.
In this paper, a novel blind method for hiding data in binary text images is presented. In this method, the embedding process is limited to the edge pixels of all connected components. In the embedding process, the secret data are located in locations so that to introduce minimal visual distortion. Unlike existing block-based methods, we embed the secret bits directly into closed outer boundary pixels of all connected components in the text image. Experimental results show the high potentials of the introduced method in terms of data capacity and image quality.
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