@article {18248,
	title = {Multi-level data hiding for digital image and video},
	journal = {SPIE Photonics East{\textquoteright}99},
	year = {1999},
	month = {1999///},
	abstract = {Previous works on data hiding generally targeted on a specific tradeoff between capacity and robustness. This results inoverestimation of the processing noise under some situations and/or underestimation under some other situations, hence
limits the overall performance. In this paper, we propose a multi-level data hiding scheme which is able to convey secondary
data in high rate when noise is not severe and can also convey some data reliably under heavy distortion. The proposed
scheme is motivated by a two-category classification of embedding schemes and by a study on detection performance of
spread spectrum watermarking. The multi-level data hiding has been successfully applied to both digital image and video,
and can be used for applications such as copy control.
},
	author = {Wu,M. and Yu,H. and Gelman,A.}
}
