Visually Meaningful Image Encryption Scheme Based on DWT and Schur Decomposition

Table 8

Colour images: the similarity test between different visual images and corresponding cover images.

Plain image	Host image	Colour component	NC	H
				Host image	Visual image
Boat ()	Earth	R	0.9998	6.5724	6.5899
		G	0.9996	7.4512	7.4617
		B	0.9998	6.7626	6.7726
		Mean	0.9997	6.9287	6.9414
	Sun	R	0.9999	7.2018	7.2371
		G	0.9999	7.2732	7.2917
		B	0.9999	7.4110	7.4344
		Mean	0.9999	7.2983	7.3211
Tulips ()	Earth	R	0.9998	6.5724	6.5889
		G	0.9996	7.4512	7.4619
		B	0.9998	6.7626	6.7736
		Mean	0.9997	6.9287	6.9415
	Sun	R	0.9999	7.2018	7.2384
		G	0.9999	7.2732	7.2927
		B	0.9999	7.4110	7.4344
		Mean	0.9999	7.2983	7.3218