An Unequal Image Privacy Protection Method Based on Saliency Detection

Table 6

The correlation coefficients of three channels.

Original image	Channel	Significant regions				Cipher blocks
		Horizontal	Vertical	Diagonal	Average	Horizontal	Vertical	Diagonal	Average
Eagle	R	0.9400	0.9740	0.9240	0.9460	−0.0035	−0.0045	−0.0033	0.0016
	G	0.9477	0.9785	0.9335	0.9532	−0.0095	0.0602	−0.0351	0.0156
	B	0.9533	0.9817	0.9411	0.9587	0.0488	0.0417	0.0230	0.0378
Chicken	R	0.9871	0.9799	0.9766	0.9812	0.0346	0.0019	−0.0055	0.0103
	G	0.9851	0.9773	0.9764	0.9796	−0.0129	−0.0250	−0.0460	0.0280
	B	0.9894	0.9845	0.9813	0.9851	−0.0010	−0.0195	0.0026	−0.0060
Leaf	R	0.8959	0.8406	0.7803	0.8389	0.0068	−0.0243	0.0427	0.0084
	G	0.8759	0.8088	0.7357	0.8068	−0.0136	0.0166	0.0253	0.0094
	B	0.8057	0.7121	0.6175	0.7118	−0.0562	0.0424	−0.0103	0.0089
Dear	R	0.9704	0.9852	0.9598	0.9718	0.0348	0.0450	−0.0138	0.0220
	G	0.9733	0.9865	0.9635	0.9744	0.0384	0.0252	0.0138	0.0258
	B	0.9778	0.9876	0.9691	0.9781	0.0183	−0.0391	−0.0164	−0.0124
Ball	R	0.9819	0.9733	0.9548	0.9700	0.0526	−0.0506	−0.0028	−0.0003
	G	0.9765	0.9577	0.9387	0.9576	−0.0218	−0.0083	−0.0329	−0.0210
	B	0.9610	0.9180	0.8859	0.9216	−0.0484	0.0597	0.0078	0.0064
Squirrel	R	0.9377	0.9256	0.9105	0.9246	0.0170	−0.0213	−0.0131	−0.0058
	G	0.9611	0.9527	0.9457	0.9532	0.0088	−0.0061	0.0007	0.0011
	B	0.9526	0.9421	0.9341	0.9429	−0.0066	0.0244	0.0129	0.0102