Robust Signature-Based Copyright Protection Scheme Using the Most Significant Gray-Scale Bits of the Image

Table 3

Attacks considered while designing the classifier.

Attacks		PSNR (dB)
Number	Name	Lena	Elaine
0	Affine^1	20.66	18.69
1	Blurring^2	36.89	42.74
2	Cropping^3	10.67	9.64
3	Histogram equal.	19.36	18.23
4	JPEG (quality 5)	28.23	28.02
5	Rot.-crop 2°	19.48	17.68
6	Rot.-scale 2°	19.33	17.58
7	Rot.-scale 5°	11.66	11.53
8	Small rand. dist.	16.27	18.55
9	MSB attack	35.00	35.00

¹Resized to original after XY-shearing.
²Gaussian filter.
³Cropping excluding ROI.