Combining Haar Wavelet and Karhunen Loeve Transforms for Medical Images Watermarking

Table 5

PSNR, WPSNR, and Normalized Cross-Correlation for watermarked and attacked by image rotation transform.

Rotation angle (°)	PSNR (dB)	WPSNR (dB)	NC
1	26.7254	34.2455	1.0000
5	19.7487	25.8241	1.0000
11	16.8277	22.8616	1.0000
15	15.7812	21.8145	0.9728
19	15.0400	21.0650	0.9812
23	14.4720	20.4955	0.9854
27	14.0551	20.0784	0.9621
31	13.7572	19.7826	0.9474
35	13.5653	19.5880	0.9455
39	13.4471	19.4679	0.9285
45	13.4550	19.4698	0.9645