Blind Image Watermarking Based on Adaptive Data Spreading in n-Level DWT Subbands

Table 5

Performance comparison with [17] with NCC value.

Attack	Proposed	[17]
Average PSNR [dB]	40.80	40.19
JPEG quality 80	1.0000	1.0000
JPEG quality 60	0.9932	1.0000
JPEG quality 40	0.8945	0.9953
Gaussian Noise 1	1.0000	0.9531
Gaussian Noise 2	1.0000	0.8707
Salt & Pepper Noise	0.9915	0.7987
Median Filtering 33	0.9627	0.9254
Median Filtering 55	0.7537	0.6992
Median Filtering 77	0.5554	0.4755
Average Filtering 33	0.9698	0.8432
Average Filtering 55	0.7255	0.6463
Gaussian Filtering 33	0.9960	0.9833
Sharpening	1.0000	0.8878
Histogram Equalization	0.5886	0.8278
Scaling to 1.8	1.0000	0.6442
Scaling to 1.5	1.0000	0.8736
Cropping 25%	0.9895	0.9298
Rotation 0.1°	0.9652	0.7461
Rotation 0.2°	0.9652	0.3761
Average robustness	0.9132	0.8145