Securing Digital Images through Simple Permutation-Substitution Mechanism in Cloud-Based Smart City Environment

Table 4

Correlation coefficients of the tested color dataset.

Image	Direction
	Hor.			Ver.			Dia.
	Red	Green	Blue	Red	Green	Blue	Red	Green	Blue
Sailboat	0.9562	0.9701	0.9708	0.9565	0.9736	0.9735	0.9464	0.9584	0.9558
Enc-sailboat	−0.0002	−0.0003	−0.0002	0.0007	0.0002	−0.0012	−0.0006	−0.0014	0.0007
Airplane	0.9625	0.9710	0.9455	0.9721	0.9623	0.9639	0.9391	0.9406	0.9263
Enc-airplane	−0.0003	−0.0011	−0.0001	0.0002	−0.0001	−0.0001	0.0002	−0.0005	0.0005
Peppers	0.9682	0.9846	0.9689	0.9670	0.9832	0.9671	0.9619	0.9722	0.9518
Enc-peppers	−0.0012	−0.0009	0.0009	0.0003	−0.0008	−0.0009	0.0003	0.0003	−0.0004