An Efficient Diffusion Scheme for Chaos-Based Digital Image Encryption

Table 6

Correlation coefficients of two adjacent pixels in the plain and cipher images.

	Correlation of plain image	Correlation of cipher images
		Cat map	Baker map	Standard map
Horizontal	0.9565	0.0023	−0.0056	0.0015
Vertical	0.8617	−0.0057	−0.0023	−0.0018
Diagonal	0.8396	−0.0013	0.0036	0.0023