Reversible Watermarking Using Prediction-Error Expansion and Extreme Learning Machine

Table 2

Comparison between Coltuc’s and proposed schemes for Kodak test images.

Method	Average improvement (dB)		Maximum improvement (dB)
	Coltuc’s	Proposed	Coltuc’s	Proposed
MED	0.54	0.67	1.10	1.15
GAP	0.09	0.21	0.43	0.68