Table 13.

Comparisons of CEF indices with other enhancement works.

Image number	AHE [11]	CLAHE [12]	HBF [13]	BPDFHE [14]	Proposed
1	0.9620	1.1197	1.0355	1.0149	1.7329
2	0.9623	1.0989	1.0077	1.0037	1.8897
3	0.9446	1.1716	1.0751	1.0547	1.8812
4	0.9946	1.2009	1.1913	1.1003	1.7443
Average of 60 endoscopic images	0.9661	1.1574	1.0614	1.0411	1.7477