A reversible watermarking scheme for two-dimensional CAD engineering graphics based on improved difference expansion

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@article{Peng2011ARW, title={A reversible watermarking scheme for two-dimensional CAD engineering graphics based on improved difference expansion}, author={Fei Peng and Yu-Zhou Lei and Min Long and Xingming Sun}, journal={Computer-Aided Design}, year={2011}, volume={43}, pages={1018-1024} }