Reversible Data Hiding in Encrypted Images Based on Adaptive Gradient Prediction

Table 1

Threshold selection strategy.

	ER(bpp)		ER(bpp)		ER(bpp)		ER(bpp)
50	2.7504	2	2.7420	2	2.7546	50	2.7520
60	2.7527	4	2.7448	4	2.7550	60	2.7525
70	2.7537	8	2.7479	8	2.7551	70	2.7528
80	2.7551	16	2.7526	16	2.7530	80	2.7551
90	2.7550	32	2.7551	32	2.7461	90	2.7530
100	2.7548	64	2.7510	64	2.7461	100	2.7530
110	2.7544	128	2.7460	128	2.7461	110	2.7530