Table 1.

Normalized correlation values.

#	Attacks	NCB	NCS
1	Crop	0.4345	0.9922
2	Salt & pepper	0.7586	0.7862
3	Gaussian	0.7472	0.7002
4	Speckle	0.4865	0.8047
5	Rotation	0.5005	0.8827
6	Scale 2X	0.9590	0.9340
7	Scale 0.5X	0.6307	0.7165
8	Median	0.9650	0.9751
10	Sharpening	0.5507	0.6234
11	Motion blur	0.6217	0.8421
12	Average filter	0.62	0.8090
13	Histogram equalization	0.6012	0.6104
14	JPEG	0.857	0.846
15	JPEG2000	0.846	0.8562