Secure Image Authentication Scheme Using Double Random-Phase Encoding and Compressive Sensing

Table 3

Correlation coefficients between adjacent pixels.

Image	Original image			Encrypted image
	Horizontal	Vertical	Diagonal	Horizontal	Vertical	Diagonal
Camera	0.9334	0.9592	0.9086	0.0032	−0.0007	0.0005
Lena	0.9458	0.9720	0.9211	−0.0025	0.0058	−0.0075
Baboon	0.8733	0.8273	0.7854	0.0054	0.0038	0.0000
Peppers	0.9610	0.9670	0.9296	0.0057	−0.0020	0.0028