Table 9.

Contrast analysis of the plain (lena ($256\times 256$)) and cipher image using the proposed algorithm at $a=2,b=0.5,c=0.5,x_{1,0}=0.11,x_{2,0}=0.12$, and $k=0.87$ and other algorithms.

Image	Contrast
	Cipher Image
	Plain	Proposed	[6]			[21]	[22]	[1]
	Image	Algorithm	Case I	Case II	Case III
lena	0.3563	10.6201	10.1655	10.3909	10.3971	10.5034	10.4723	10.4767