A QR Code Based Zero-Watermarking Scheme for Authentication of Medical Images in Teleradiology Cloud

Table 5

Comparison for shrinkage attacks (BER).

Scheme	Shrinkage %
	50%	75%
Kim et al. [27]	6.20 (Spatial)	21.58 (Spatial)
Proposed scheme
CT	0.0009	0.0009
Mammogram	0.0251	0.0239
MRA	0.0006	0.0004
Nuclear	0.0001	0.0002
PET	0.0007	0.0005
Ultrasound	0.0001	0.0001
X-ray	0.0040	0.0034