Advanced Image Enhancement Method for Distant Vessels and Structures in Capsule Endoscopy

Table 3

Contrast enhancement in RGB channels.

	R	G	B	R	G	B	R	G	B
	M1			M2			PM
Image 1	1.4871	1.7152	2.6847	0.6170	0.7056	1.1189	0.5971	0.3816	0.4361
Image 2	1.1449	1.9602	2.6177	0.4896	0.8251	1.0918	0.5083	0.4953	0.4819
Image 3	0.6263	1.5121	2.9125	0.2524	0.6325	1.2030	0.2408	0.1254	0.2000
Image 4	0.9968	1.1078	2.1161	0.4093	0.4490	0.8893	0.3882	0.1263	0.1579
Image 5	0.6197	1.0664	2.1690	0.2402	0.4448	0.9033	0.2174	0.1472	0.0823
Image 6	0.8775	1.1147	1.9780	0.3650	0.4659	0.8229	0.3696	0.3790	0.2357
Image 7	1.0862	2.3800	2.4949	0.4629	0.9928	1.0208	0.4755	0.5610	0.4777
	HE			AHE			CLAHE
Image 1	−0.2728	0.7372	3.5268	0.1090	0.6680	1.6756	−0.2641	0.2772	1.1922
Image 2	−0.3860	0.0399	0.6312	0.0222	0.5216	1.0866	−0.3606	−0.0143	0.3703
Image 3	−0.5415	0.0705	3.3189	−0.1862	0.3917	2.4028	−0.4900	−0.0477	1.6584
Image 4	−0.4388	0.1519	1.7447	−0.0520	0.3140	1.1327	−0.3701	−0.0410	0.6516
Image 5	−0.3852	−0.1038	0.5886	−0.1344	−0.0435	0.3814	−0.4766	−0.3579	0.0057
Image 6	−0.2046	−0.0317	1.1356	−0.1869	−0.0964	0.6501	−0.5088	−0.4126	0.1961
Image 7	−0.3498	0.2051	1.5053	−0.0333	0.4124	1.5220	−0.4192	−0.0744	0.8891