Medical Image Key Area Protection Scheme Based on QR Code and Reversible Data Hiding

Table 2

Test result.

Images	The size of the key area	Payload	Threshold	PSNR (dB)	SSIM
a	80 × 80	51200	5	44.48	0.982
b	80 × 80	51200	5	42.78	0.986
c	128 × 128	131072	10	44.04	0.963
d	128 × 128	131072	10	41.67	0.971
e	128 × 128	131072	10	40.73	0.970
f	128 × 128	131072	10	40.59	0.960