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Table 6 NC values and % errors of detection of angles for the rotation attack

From: A copyright protection scheme for digital images based on shuffled singular value decomposition and visual cryptography

Lena
Rotation	5°	10°	15°	20°	25°	30°	35°	40°	45°	50°	55°	60°	65°	70°	75°	80°	85°
Detection	5.15°	10.17°	15.09°	20.10°	25.13°	30.06°	35.11°	39.99°	45.00°	50.00°	54.88°	59.93°	64.86°	69.86°	74.90°	79.82°	84.84°
Error %	−3.02	−1.78	−0.62	−0.50	−0.53	−0.22	−0.32	0.01	0	0	0.20	0.11	0.20	0.19	0.12	0.22	0.17
NC	95.89	95.84	95.89	95.94	93.67	95.97	95.99	95.80	95.80	95.94	95.89	95.99	95.06	95.92	95.94	95.89	95.84
Mandrill
Rotation	5°	10°	15°	20°	25°	30°	35°	40°	45°	50°	55°	60°	65°	70°	75°	80°	85°
Detection	5.11°	10.17°	15.09°	20.10°	25.13°	30.06°	35.11°	39.99°	45°	50°	54.88°	59.93°	64.86°	69.69°	74.90°	79.82°	84.84°
Error %	−3.02	−1.78	−0.62	−0.50	−0.53	−0.22	−0.32	0.01	0	0	0.20	0.11	0.20	0.14	0.12	0.22	0.17
NC	95.50	95.50	95.55	95.48	93.70	93.82	95.43	95.38	93.82	93.67	95.45	95.41	93.79	95.45	95.50	95.48	95.48

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