A Polar Complex Exponential Transform-Based Zero-Watermarking for Multiple Medical Images with High Discrimination

Table 2

Experimental settings.

Medical image database	TCIA [26]
Image size	512 × 512, 256 × 256
Number of images	355
Watermark size	32 × 32, 48 × 32, 48 × 48, 64 × 64, 1000, 2000, 3000, 4000, 5000, 6000, 7000, 8000
Maximum order K of proposed scheme	8
Similar schemes	[19, 20, 24]