Image Robust Watermarking Method Based on DWT-SVD Transform and Chaotic Map

Table 8

NC values compared with that of references [46, 47].

Attacks	Lena			Pepper			Boat
	Ref. [46]	Ref. [47]	Ours	Ref. [46]	Ref. [47]	Ours	Ref. [46]	Ref. [47]	Ours
Gaussian noise (0.001)	0.9270	0.9932	0.9998	0.9702	0.9591	0.9997	0.9727	0.9258	0.9998
Salt and pepper noise (0.001)	0.9728	0.9883	0.9986	0.9865	0.9863	0.9998	0.9728	0.9260	0.9922
Center cropping 25%	0.9777	0.8375	0.9977	0.9610	0.9912	0.9962	0.9604	0.9120	0.9985
Cropping 25% rows	0.8681	0.8429	0.9877	0.8908	0.8392	0.9750	0.8595	0.6119	0.9961
Cropping 50% rows	0.7543	0.7144	0.8885	0.6649	0.7161	0.9224	0.7663	0.4812	0.8576
JPEG (QF = 70)	1	0.9990	0.8252	1	0.9592	0.8231	1	0.9271	0.8763
JPEG (QF = 60)	1	0.9990	0.7964	1	0.9523	0.7948	1	0.9271	0.8536