Text Watermarking Algorithm based on Human Visual Redundancy

Text digital watermarking, which is an important research direction of information hiding, can be used for copyright protection of text document. This paper proposed a text digital watermarking algorithm based on human visual redundancy. As the human eye is not sensitive to the slight change for text color, watermarks were embedded by changing the low-4 of RGB color components of characters. Experiment shows that the proposed method has good invisibility and robustness to resist deletion, modification attack etc. As long as there are N/8.6 consecutive characters left in the document, the watermarks can still be extracted completely using proposed algorithm.

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