| Abstract: | This paper analyzes the characteristic of digital watermarking of engineering drawing. A perturbation methodology is presented to embed the watermark into engineering drawing through the coding redundant information. The algorithms of embedding watermark into line, arc and circle in engineering drawing and detecting the watermark from them are proposed in this paper. Due to the magnitude of perturbation is very small, the watermark can not be apperceived, and does not influence the function of drawing. Subsequently, the capability of resisting the attack of moving, rotating, zooming, adding and deleting is discussed in theory and practice. |
