Spread Spectrum Digital Watermarking Algorithm Based on Two-dimensional Engineering Graphics
Wang Ya-shun · Journal of Nanchang University · 2005
A digital watermarking scheme is presented according to the characteristics of two-dimensional(engineering) graphics.Narrowband watermarking information is spread into wideband pseudo-random code before being embedded by modifying the scale of the distance between vertexes in two-dimensional engineering graphics.If the visual effect is the same,this scale will not be changed because it is a whole characteristic.This scheme is very robust against the attack such as rotation,moving,equal scaling and so on,which is illustrated by the result of the experiment.