A Secure and Efficient Image Transmission Scheme Based on Two Chaotic Maps

Table 11

Correlation test results for adjacent pixels of plain images and their cipher images.

Filename	Horizontal		Vertical		Diagonal
	Plain image	Cipher image	Plain image	Cipher image	Plain image	Cipher image
5.2.08.tiff	0.8906	0.0008	0.9322	−0.0038	0.8452	0.0028
5.2.09.tiff	0.8591	−0.0004	0.9000	−0.0018	0.8007	0.0020
5.3.01.tiff	0.9817	0.0015	0.9776	0.0044	0.8981	−0.0033
7.1.02.tiff	0.9446	−0.0024	0.9431	−0.0016	0.9003	0.0001
7.1.03.tiff	0.9317	−0.0021	0.9436	0.0002	0.9059	−0.0017
7.1.04.tiff	0.9672	0.0038	0.9771	0.0028	0.9552	−0.0059
7.1.05.tiff	0.9108	0.0038	0.9425	0.0058	0.8919	0.0024
boat.512.tiff	0.9711	0.0030	0.9394	0.0048	0.9245	0.0002
elaine.512.tiff	0.9720	−0.0011	0.9761	0.0010	0.9696	0.0016
gray21.512.tiff	0.9998	−0.0023	0.9968	−0.0036	0.9966	0.0031
ruler.512.tiff	0.4702	−0.0026	0.4524	0.0004	−0.0312	−0.0023
testpat.1k.tiff	0.7992	0.0035	0.7501	0.0051	0.6997	0.0005