An innovative technique for contrast enhancement of computed tomography images using normalized gamma-corrected contrast-limited adaptive histogram equalization

EURASIP Journal on Advances in Signal Processing

Table 1 The recorded accuracy and time of the previous comparison

Number	Methods	Reduction	UIQI	SSIM	FSIM	Time
1	Low-contrast images	Low	0.8688	0.8897	0.9478	N/A
		High	0.8227	0.8392	0.9041	N/A
		Average	0.84575	0.86445	0.92595	N/A
2	HE	Low	0.3944	0.4502	0.7951	0.037829
		High	0.3821	0.4618	0.8091	0.044582
		Average	0.38825	0.456	0.8021	0.04121
3	CLAHE	Low	0.5779	0.7221	0.9254	0.129379
		High	0.5198	0.6880	0.8938	0.183378
		Average	0.54885	0.70505	0.9096	0.15638
4	BBHE	Low	0.5044	0.6023	0.9059	0.180873
		High	0.4528	0.5123	0.8381	0.304549
		Average	0.4786	0.5573	0.872	0.24271
5	DSIHE	Low	0.5606	0.7099	0.9488	0.196712
		High	0.4673	0.5380	0.8494	0.254991
		Average	0.51395	0.62395	0.8991	0.22585
6	RMSHE	Low	0.4955	0.6202	0.9235	0.095256
		High	0.4531	0.5239	0.8428	0.196540
		Average	0.4743	0.57205	0.88315	0.1459
7	MMBEBHE	Low	0.5708	0.7000	0.9287	0.462935
		High	0.5271	0.5584	0.8213	0.649516
		Average	0.54895	0.6292	0.875	0.55623
8	RSIHE	Low	0.5596	0.7125	0.9467	0.094337
		High	0.4551	0.5260	0.8443	0.161408
		Average	0.50735	0.61925	0.8955	0.12787
9	BPDFHE	Low	0.8515	0.8609	0.9452	0.058763
		High	0.7888	0.8310	0.9208	0.113260
		Average	0.82015	0.84595	0.933	0.08601
10	NMHE	Low	0.8211	0.8686	0.9598	0.077375
		High	0.7594	0.7984	0.9031	0.256062
		Average	0.79025	0.8335	0.93145	0.16672
11	ESIHE	Low	0.8198	0.8575	0.9386	0.092206
		High	0.7448	0.7734	0.9003	0.158471
		Average	0.7823	0.81545	0.91945	0.12534
12	Proposed NGCCLAHE	Low	0.9516	0.9720	0.9695	0.271025
		High	0.8597	0.9083	0.9116	0.314088
		Average	0.90565	0.94015	0.94055	0.29256