An Image Encryption Algorithm Based on Balanced Pixel and Chaotic Map

Table 3

The comparison of the correlation coefficients of Lena’s images.

Correlation	Horizontal direction	Vertical direction	Diagonal direction
Original image	0.9768	0.9145	0.9353
Encrypted image	0.0027	0.0016	−0.0028
Reference [21]	0.0046	0.0043	0.0049
Reference [22]	0.0059	−0.0052	0.0190