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

Table 11

Encryption performance indicators of watermarked image

Image	NPCR (%)	UACI (%)	Entropy	Correlation coefficient
				Horizontal	Vertical	Diagonal
Test (plain)	—	—	0.4309	0.90883	0.91706	0.85716
Test (cipher)	99.6089	33.5712	7.9944	0.00502	0.01194	0.00318