Blockchain-Based Reversible Data Hiding for Securing Medical Images

Table 1

Experimental results of the proposed scheme with different thresholds.

Image	Metrics	= 4	= 8	= 16	= 32	= 64
Airplane	Capacity	102125	140358	171658	190931	202715
	Metadata	42	66	162	6666	12858
	ER (bpp)	0.38	0.53	0.65	0.72	0.77
	PSNR	61.64	58.29	54.77	37.72	34.35
	SSIM	0.9999	0.9999	0.9999	0.995	0.9912
Baboon	Capacity	30506	56047	93320	134879	173447
	Metadata	1242	2298	4962	12810	51138
	ER (bpp)	0.11	0.21	0.35	0.51	0.66
	PSNR	42.61	40.32	36.99	32.79	26.12
	SSIM	0.999	0.9983	0.9961	0.9895	0.9516
Boat	Capacity	79348	119982	153134	184078	209831
	Metadata	114	210	546	1866	10626
	ER (bpp)	0.3	0.45	0.58	0.7	0.8
	PSNR	56.36	52.21	46.9	40.83	32.5
	SSIM	0.9999	0.9999	0.9996	0.9983	0.9879
Lena	Capacity	83908	127070	164152	194295	209334
	Metadata	138	162	354	738	4506
	ER (bpp)	0.32	0.48	0.62	0.74	0.79
	PSNR	53.11	52.07	48.24	45.27	36.04
	SSIM	0.9999	0.9999	0.9997	0.9993	0.9944
Pepper	Capacity	81892	127696	167267	195067	214845
	Metadata	258	498	954	1794	5586
	ER (bpp)	0.31	0.48	0.63	0.74	0.81
	PSNR	51.15	47.48	43.9	40.5	35.82
	SSIM	0.9998	0.9997	0.9993	0.9982	0.9944
Sailboat	Capacity	56910	93681	134503	176246	195452
	Metadata	474	930	1794	3906	10122
	ER (bpp)	0.21	0.35	0.51	0.67	0.74
	PSNR	45.23	41.76	39.11	35.87	31.43
	SSIM	0.9995	0.999	0.998	0.9958	0.9872