Image Encryption with Double Spiral Scans and Chaotic Maps

Table 3

Comparison of the variance of histogram among different algorithms.

Image	Original variance	Variance of histogram of the encrypted result
		[6]	[25]	[31]	Our
Lena	0.9725×10^6	0.1681×10^6	607.3	1339	1052.4
Fingerprint	1.5573×10^6	0.6517×10^6	34.96	277.51	329.11
Woman	0.1696×10^6	0.0793×10^6	369.33	260.1	245.37
Lake	0.7899×10^6	0.1514×10^6	3515.0	2146.5	1030.3
Goldhill	1.5506×10^6	0.9906×10^6	5538.7	2519.7	1737.4
ChestXray	6.1454×10^6	3.5074×10^6	1164.6	1164.1	1356.9
Average	1.8643×10^6	0.9248×10^6	2421.6	1284.5	958.58