Wavelet-Based Color Pathological Image Watermark through Dynamically Adjusting the Embedding Intensity

Table 6

Compare the proposed method with the algorithms in [4, 11, 18].

Attacks	NC
	Reference [4]	Reference [11]	Reference [18]	Our algorithm
	(PSNR = 42.02 dB)	(PSNR = 44.73 dB)	(PSNR = 42.98 dB)	(PSNR = 31.14 dB)
Median filter (3×3)	0.90	0.88	0.93	1
JPEG (ratio = 0.80)	0.99	NA	1	0.9997
JPEG (ratio = 0.50)	0.96	0.95	0.96	0.9976
JPEG (ratio = 0.10)	0.34	0.33	0.32	0.9987
Rotation (degree: 0.25°)	0.59	0.61	0.65	0.9897
Rotation (degree: −0.25°)	0.60	0.65	0.72	0.9900
Cropping 1/4	0.66	0.60	0.67	0.8561
Scaling 256×256	0.88	0.71	0.85	0.9999