Improved Glowworm Swarm Optimization Algorithm for Multilevel Color Image Thresholding Problem

Table 6

Comparison of optimal PSNR (dB) and SSIM values obtained by IGSO, GSO, APSO, and SaDE algorithms using Otsu’s method.

Image		IGSO		GSO		APSO		SaDE
		PSNR	SSIM	PSNR	SSIM	PSNR	SSIM	PSNR	SSIM
Airplane	2	10.0144	0.7740	10.0144	0.7740	10.0144	0.7740	10.0144	0.7740
	4	10.0188	0.8246	10.0188	0.8246	10.0188	0.8246	10.0188	0.8246
	6	10.0300	0.8575	10.0263	0.8398	10.0211	0.8346	10.0243	0.8369
	8	10.3589	0.9134	10.3524	0.9029	10.3439	0.8958	10.3481	0.9016
Couple	2	27.0382	0.8025	27.0382	0.8025	27.0382	0.8025	27.0382	0.8025
	4	27.0470	0.8830	27.0470	0.8830	27.0470	0.8830	27.0470	0.8830
	6	27.0579	0.9143	27.0518	0.9093	27.0492	0.8976	27.0507	0.9036
	8	27.0602	0.9427	27.0559	0.9362	27.0517	0.9294	27.0526	0.9316
Flower	2	19.3175	0.8460	19.3175	0.8460	19.3175	0.8460	19.3175	0.8460
	4	19.3280	0.9040	19.3280	0.9040	19.3280	0.9040	19.3280	0.9040
	6	19.3296	0.9372	19.3278	0.9340	19.3283	0.9207	19.3289	0.9222
	8	20.3152	0.9604	20.2937	0.9549	20.2859	0.9508	20.2924	0.9526
Girl	2	24.0610	0.7112	24.0610	0.7112	24.0610	0.7112	24.0610	0.7112
	4	24.0734	0.8011	24.0734	0.8011	24.0734	0.8011	24.0734	0.8011
	6	24.0798	0.8584	24.0766	0.8546	24.0739	0.8512	24.0748	0.8527
	8	24.0824	0.9094	24.0802	0.8982	24.0767	0.8927	24.0789	0.8936
Monarch	2	19.4727	0.7658	19.4727	0.7658	19.4727	0.7658	19.4727	0.7658
	4	19.4767	0.8589	19.4767	0.8589	19.4767	0.8589	19.4767	0.8589
	6	19.4785	0.9155	19.4778	0.9116	19.4771	0.9059	19.4776	0.9081
	8	19.4941	0.9454	19.4879	0.9387	19.4811	0.9255	19.4918	0.9312
Pen	2	19.8912	0.8420	19.8912	0.8420	19.8912	0.8420	19.8912	0.8420
	4	19.8935	0.8791	19.8935	0.8791	19.8935	0.8791	19.8935	0.8791
	6	19.8983	0.9330	19.8961	0.9238	19.8938	0.9170	19.8947	0.9215
	8	19.9014	0.9629	19.9001	0.9581	19.8979	0.9543	19.8990	0.9566
Pepper	2	18.1771	0.8046	18.1771	0.8046	18.1771	0.8046	18.1771	0.8046
	4	18.1789	0.8384	18.1789	0.8384	18.1789	0.8384	18.1789	0.8384
	6	18.1856	0.9004	18.1825	0.8976	18.1796	0.8880	18.1811	0.8916
	8	18.1891	0.9476	18.1836	0.9302	18.1801	0.9164	18.1822	0.9251
Soccer	2	20.3329	0.8088	20.3329	0.8088	20.3329	0.8088	20.3329	0.8088
	4	20.3368	0.8570	20.3368	0.8570	20.3368	0.8570	20.3368	0.8570
	6	20.3466	0.9023	20.3421	0.8931	20.3389	0.8822	20.3405	0.8886
	8	20.3474	0.9529	20.3437	0.9493	20.3410	0.9330	20.3422	0.9375
Test	2	18.5023	0.7611	18.5023	0.7611	18.5023	0.7611	18.5023	0.7611
	4	18.5081	0.8508	18.5081	0.8508	18.5081	0.8508	18.5081	0.8508
	6	18.5106	0.9017	18.5091	0.8959	18.5086	0.8883	18.5089	0.8913
	8	18.5144	0.9446	18.5120	0.9274	18.5095	0.9122	18.5107	0.9208
Yacht	2	18.5073	0.8133	18.5073	0.8133	18.5073	0.8133	18.5073	0.8133
	4	18.5083	0.8503	18.5083	0.8503	18.5083	0.8503	18.5083	0.8503
	6	18.5090	0.9035	18.5086	0.8910	18.5082	0.8865	18.5085	0.8894
	8	18.5164	0.9542	18.5122	0.9389	18.5097	0.9120	18.5106	0.9274