Improved Glowworm Swarm Optimization Algorithm for Multilevel Color Image Thresholding Problem

Table 10

Comparison of optimal PSNR (dB) and SSIM values obtained by IGSO and GSO algorithms using OTSU and MCE.

Image		PSNR (Otsu)		PSNR (MCE)		SSIM (Otsu)		SSIM (MCE)
		IGSO	GSO	IGSO	GSO	IGSO	GSO	IGSO	GSO
Airplane	2	10.0144	10.0144	10.0178	10.0178	0.7740	0.7740	0.7896	0.7896
	4	10.0188	10.0188	10.0216	10.0216	0.8246	0.8246	0.8394	0.8394
	6	10.0300	10.0263	10.0381	10.0311	0.8575	0.8398	0.8794	0.8708
	8	10.3589	10.3524	10.3641	10.0592	0.9134	0.9029	0.9308	0.9248
Couple	2	27.0382	27.0382	27.0372	27.0372	0.8025	0.8025	0.8270	0.8270
	4	27.0470	27.0470	27.0478	27.0478	0.8830	0.8830	0.8860	0.8860
	6	27.0579	27.0518	27.0568	25.0526	0.9143	0.9093	0.9128	0.9032
	8	27.0602	27.0559	27.0613	25.0588	0.9427	0.9362	0.9460	0.9343
Flower	2	19.3175	19.3175	19.3352	19.3352	0.8460	0.8460	0.8696	0.8696
	4	19.3280	19.3280	19.3369	19.3369	0.9040	0.9040	0.9037	0.9037
	6	19.3286	19.3278	19.3385	19.3376	0.9372	0.9340	0.9385	0.9243
	8	20.3152	20.2937	20.3439	19. 3417	0.9604	0.9549	0.9679	0.9538
Girl	2	24.0610	24.0610	24.0684	24.0684	0.7112	0.7112	0.7274	0.7274
	4	24.0734	24.0734	24.0725	24.0725	0.8011	0.8011	0.8369	0.8369
	6	24.0758	24.0766	24.0761	24.0749	0.8584	0.8546	0.8740	0.8649
	8	24.0824	24.0802	24.0844	24.0824	0.9094	0.8982	0.9192	0.9069
Monarch	2	19.4727	19.4727	19.4791	19.4791	0.7658	0.7658	0.7605	0.7605
	4	19.4767	19.4767	19.4851	19.4851	0.8589	0.8589	0.8648	0.8648
	6	19.4785	19.4778	19.4867	19.4862	0.9155	0.9116	0.9208	0.9121
	8	19.4941	19.4879	19.4939	19.4902	0.9454	0.9387	0.9524	0.9408
Pen	2	19.8912	19.8912	19.8970	19.8970	0.8420	0.8420	0.8281	0.8281
	4	19.8935	19.8935	19.8992	19.8992	0.8791	0.8791	0.8878	0.8878
	6	19.8983	19.8961	19.8994	19.8993	0.9330	0.9238	0.9317	0.9244
	8	19.9014	19.9001	19.9052	19.9021	0.9629	0.9581	0.9637	0.9546
Pepper	2	18.1771	18.1771	18.1823	18.1823	0.8046	0.8046	0.8189	0.8189
	4	18.1789	18.1789	18.1849	18.1849	0.8384	0.8384	0.8460	0.8460
	6	18.1856	18.1825	18.1857	18.1860	0.9004	0.8976	0.9021	0.8967
	8	18.1891	18.1836	18.1897	18.1883	0.9476	0.9302	0.9483	0.9377
Soccer	2	20.3329	20.3329	20.3415	20.3415	0.8088	0.8088	0.8016	0.8016
	4	20.3368	20.3368	20.3378	20.3378	0.8570	0.8570	0.8512	0.8512
	6	20.3466	20.3421	20.3471	20.3442	0.9023	0.8931	0.9071	0.8992
	8	20.3474	20.3437	20.3499	20.3475	0.9529	0.9493	0.9560	0.9477
Test	2	18.5023	18.5023	18.5027	18.5027	0.7611	0.7611	0.7658	0.7658
	4	18.5081	18.5081	18.5155	18.5155	0.8508	0.8508	0.8560	0.8560
	6	18.5106	18.5091	18.5157	18.5154	0.9017	0.8959	0.9021	0.8938
	8	18.5144	18.5120	18.5168	18.5161	0.9446	0.9274	0.9533	0.9486
Yacht	2	18.5073	18.5073	18.5135	18.5135	0.8133	0.8133	0.8195	0.8195
	4	18.5083	18.5083	18.5172	18.5172	0.8503	0.8503	0.8611	0.8611
	6	18.5090	18.5086	18.5175	18.5179	0.9035	0.8910	0.9150	0.9021
	8	18.5164	18.5122	18.5203	18.5186	0.9542	0.9389	0.9608	0.9454