Reversible watermarking of 2D-vector data
Proceedings of the 2004 workshop on Multimedia and security
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CMC '09 Proceedings of the 2009 WRI International Conference on Communications and Mobile Computing - Volume 03
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According to the characteristics of the coordinates and phases in 2D CAD engineering graphics, difference histograms are constructed. Consequently, two reversible watermarking schemes based on difference histogram shifting are put forward. The first scheme HS_C implements the integer part of coordinate values to construct the adjacent difference histogram and hides messages in the peak and zero point pairs. The scheme can achieve high capacity and good invisibility in the graphics with high correlated coordinates. Instead of coordinates, the second scheme HS_P adopts the integer part of the phase value as the cover data, and the watermark is embedded by shifting and modifying the difference histogram of the phase. It is robust against translation, rotation and even scaling. Experimental results show that both schemes are strictly reversible. The proposed schemes have great potential to be applied for content authentication or secret communication of 2D CAD engineering graphics.