1. [1] J.M. Barton, “Method and apparatus for embedding authentication information within digital data,” United States Patent, 5 646 997, July 1997.
2. [2] M.U. Celik, G. Sharma, A.M. Tekalp, and E. Saber, “Reversible data hiding,” Proc. IEEE International Conference on Image Processing, vol.2, pp.157-160, 2002.
3. Reversible data embedding using a difference expansion
4. [4] D.M. Thodi and J.J. Rodriguez, “Prediction-error based reversible watermarking,” Proc. IEEE Int. Conf. Image Process., vol.3, pp.1549-1552, 2004.
5. [5] A.M. Alattar, “Reversible watermark using difference expansion of quads,” Proc. IEEE International Conference on Acoustics, Speech, and Signal Processing, vol.3, pp.377-380, 2004.