Abstract
In this paper, a blind digital watermarking scheme for Portable Document Format (PDF) documents is proposed. The proposed method is based on a variant Quantization Index Modulation (QIM) method called Spread Transform Dither Modulation (STDM). Each bit of the secret message is embedded into a group of characters, more specifically in their x-coordinate values. The method exhibits experiments of two opposite objectives: transparency and robustness, and is motivated to present an acceptable distortion value that shows sufficient robustness under high density noises attacks while preserving sufficient transparency.
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Bitar, A.W., Darazi, R., Couchot, JF. et al. Blind digital watermarking in PDF documents using Spread Transform Dither Modulation. Multimed Tools Appl 76, 143–161 (2017). https://doi.org/10.1007/s11042-015-3034-2
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DOI: https://doi.org/10.1007/s11042-015-3034-2