Table 4.

Correlation coefficients comparison for different encryption algorithms (R channel of Lena).

Direction	Original Image	Our Scheme	Ref. [11]	Ref. [18]	Ref. [28]	Ref. [32]	Ref. [36]
Horizontal	0.9853	0.0003	0.0013	−0.0038	−0.0031	0.0046	0.0005
Vertical	0.9753	0.0040	0.0034	−0.0026	0.0025	−0.0028	−0.0070
Diagonal	0.9734	0.0013	0.0072	0.0017	−0.0001	0.0014	0.0006