A new evaluation function for face image enhancement in unconstrained environments using metaheuristic algorithms

EURASIP Journal on Image and Video Processing

Table 5 Number of edge value comparison between results obtained using different enhancement methods on standard benchmark face datasets

Database	LCS	HE	IIA	M_PSO	M_GA	BPDFHE	CLAHE	LLIE	Proposed
AR
Image 1	624	1240	624	2395	2175	684	1981	1362	2889
Image 2	522	1375	522	2089	2071	514	1882	1010	2223
Image 3	696	1315	696	1976	2016	683	1866	1186	2756
Image 4	781	1017	781	1993	1974	665	1627	992	3044
Image 5	726	672	726	2072	2072	570	1915	1073	3776
Image 6	700	1496	700	1898	1901	733	1657	671	3247
YF
Image 1	1842	4580	1842	5028	5213	1604	2946	2546	9247
Image 2	1699	6158	1699	5727	5804	1514	4064	2631	9106
Image 3	1756	2829	1756	4825	4013	1677	2151	2328	6517
Image 4	1521	7184	1521	5464	5509	2514	4234	2604	9013
Image 5	1349	2103	1349	3780	3409	1217	1845	2209	5461
Image 6	1409	2377	1409	3982	3514	1307	2153	2095	5490
ORL
Image 1	458	546	458	1124	1195	354	911	569	1898
Image 2	603	713	603	1633	1634	395	1293	890	2532
Image 3	714	812	714	1325	1326	517	1122	877	2203
Image 4	668	751	668	1334	1197	519	1346	753	2313
Image 5	566	465	566	1436	1450	470	955	725	2021
Image 6	602	524	602	944	987	424	945	775	1865