Image Encryption Based on High-Dimensional Manifold Computing and Block Dividing Algorithm

Table 2

Correlation coefficients between the original and cipher images.

Plain/cipher image	Image	Correlation direction
		Horizontal	Vertical	Diagonal
Plain image	Lena	0.9849	0.9718	0.9570
	Baboon	0.7574	0.8633	0.7293
	Airplane	0.9648	0.9465	0.9722
	Couple	0.9524	0.9155	0.9450
Cipher image	Lena	0.0068	0.0103	0.0044
	Baboon	0.0148	0.0248	0.0061
	Airplane	0.0069	0.0086	0.0133
	Couple	0.0380	0.0041	0.0205