Table 7.

SSIM results of Kapur's entropy for all algorithms.

Image	K	Algorithms
		SOA [45]	HHOA [35]	FPA [18]	CS [19]	HS [15]	SCA [22]	BA [23]	COVID-HHOA
Medical1	6	0.5585	0.5633	0.5626	0.5126	0.5394	0.5548	0.5601	0.5641
	8	0.5823	0.5806	0.5638	0.5801	0.5785	0.5732	0.5779	0.5855
	10	0.5989	0.5995	0.5909	0.5816	0.5871	0.5956	0.5973	0.6048
	12	0.6166	0.6217	0.6054	0.6027	0.6008	0.6082	0.6253	0.6244
	14	0.6392	0.6342	0.6336	0.6354	0.6169	0.6332	0.6345	0.6447
Medical2	6	0.5761	0.5558	0.5814	0.6086	0.6108	0.5853	0.5688	0.5788
	8	0.6565	0.6564	0.6581	0.6488	0.6691	0.6681	0.6533	0.6720
	10	0.7200	0.7021	0.6883	0.6527	0.7017	0.6964	0.7025	0.7270
	12	0.7445	0.7422	0.7418	0.7230	0.7038	0.7456	0.7599	0.7649
	14	0.7577	0.7848	0.7718	0.7506	0.7567	0.7740	0.7807	0.7907
Medical3	6	0.6471	0.6464	0.6453	0.6352	0.6387	0.6397	0.6513	0.6482
	8	0.6888	0.6949	0.6910	0.6918	0.6952	0.6841	0.6950	0.6985
	10	0.7388	0.7480	0.7097	0.7437	0.7085	0.7379	0.7385	0.7477
	12	0.7523	0.7687	0.7408	0.7579	0.7409	0.7634	0.7748	0.7789
	14	0.7899	0.7924	0.7499	0.7897	0.7800	0.7671	0.8067	0.8424
Medical4	6	0.5623	0.5478	0.5994	0.5531	0.5854	0.5529	0.5346	0.5566
	8	0.6601	0.6193	0.6186	0.6129	0.6284	0.6478	0.6628	0.6614
	10	0.6743	0.6872	0.6274	0.6773	0.6901	0.6729	0.6712	0.7033
	12	0.7491	0.7311	0.6919	0.7003	0.7278	0.7297	0.7454	0.7537
	14	0.7764	0.7603	0.7676	0.7382	0.7320	0.7659	0.7666	0.7777
Medical5	6	0.8266	0.8357	0.8094	0.8598	0.8313	0.8300	0.8326	0.8385
	8	0.8763	0.8703	0.8681	0.8831	0.8771	0.8879	0.8814	0.8913
	10	0.9187	0.9128	0.8942	0.9206	0.9227	0.9109	0.9057	0.9233
	12	0.9262	0.9267	0.9235	0.9321	0.9322	0.9146	0.9305	0.9376
	14	0.9453	0.9543	0.9481	0.9518	0.9387	0.9296	0.9461	0.9613
Medical6	6	0.6015	0.6064	0.5905	0.6248	0.6047	0.6142	0.6019	0.6101
	8	0.6299	0.6296	0.5931	0.6347	0.6115	0.6281	0.6309	0.6325
	10	0.6421	0.6379	0.6299	0.6445	0.6189	0.6410	0.6459	0.6485
	12	0.6513	0.6561	0.6566	0.6603	0.6398	0.6502	0.6531	0.6627
	14	0.6655	0.6663	0.6592	0.6642	0.6625	0.6542	0.6625	0.6717