Table 9.
Comparison between MRFO-OBL and all other algorithms according to the SSIM mean values
| Test image | nTh | MFO | WOA | SCA | SSA | EO | MRFO | MRFO-OBL |
|---|---|---|---|---|---|---|---|---|
| CT-image1 | 7 | 0.8772 | 0.8747 | 0.8447 | 0.8731 | 0.8819 | 0.8763 | 0.8865 |
| 8 | 0.8957 | 0.8977 | 0.8613 | 0.8934 | 0.8987 | 0.8955 | 0.9035 | |
| 9 | 0.9063 | 0.9052 | 0.8784 | 0.9056 | 0.9130 | 0.9059 | 0.9138 | |
| 10 | 0.9146 | 0.9171 | 0.8940 | 0.9128 | 0.9240 | 0.9171 | 0.9230 | |
| CT-image2 | 7 | 0.9147 | 0.9092 | 0.8887 | 0.9143 | 0.9185 | 0.9153 | 0.9245 |
| 8 | 0.9275 | 0.9261 | 0.9109 | 0.9263 | 0.9300 | 0.9274 | 0.9348 | |
| 9 | 0.9378 | 0.9347 | 0.9141 | 0.9374 | 0.9416 | 0.9374 | 0.9444 | |
| 10 | 0.9453 | 0.9446 | 0.9129 | 0.9444 | 0.9511 | 0.9464 | 0.9523 | |
| CT-image3 | 7 | 0.9219 | 0.9199 | 0.8759 | 0.9209 | 0.9270 | 0.9249 | 0.9303 |
| 8 | 0.9356 | 0.9359 | 0.9015 | 0.9350 | 0.9371 | 0.9364 | 0.9443 | |
| 9 | 0.9463 | 0.9422 | 0.9172 | 0.9446 | 0.9494 | 0.9467 | 0.9526 | |
| 10 | 0.9536 | 0.9532 | 0.9271 | 0.9525 | 0.9578 | 0.9550 | 0.9605 | |
| CT-image4 | 7 | 0.9168 | 0.9092 | 0.8900 | 0.9105 | 0.9215 | 0.9148 | 0.9276 |
| 8 | 0.9323 | 0.9309 | 0.8977 | 0.9309 | 0.9327 | 0.9317 | 0.9402 | |
| 9 | 0.9450 | 0.9408 | 0.9148 | 0.9437 | 0.9492 | 0.9460 | 0.9531 | |
| 10 | 0.9535 | 0.9522 | 0.9196 | 0.9522 | 0.9593 | 0.9539 | 0.9595 | |
| CT-image5 | 7 | 0.7591 | 0.7748 | 0.7418 | 0.7626 | 0.7607 | 0.7568 | 0.7629 |
| 8 | 0.7710 | 0.7935 | 0.7326 | 0.7824 | 0.7769 | 0.7725 | 0.7731 | |
| 9 | 0.7849 | 0.8163 | 0.7696 | 0.8036 | 0.7935 | 0.7864 | 0.7913 | |
| 10 | 0.7975 | 0.8491 | 0.7745 | 0.8107 | 0.8173 | 0.8021 | 0.8057 | |
| CT-image6 | 7 | 0.8856 | 0.8856 | 0.8574 | 0.8837 | 0.8890 | 0.8848 | 0.8872 |
| 8 | 0.9060 | 0.9104 | 0.8695 | 0.9063 | 0.9119 | 0.9108 | 0.9250 | |
| 9 | 0.9207 | 0.9172 | 0.8815 | 0.9232 | 0.9251 | 0.9194 | 0.9348 | |
| 10 | 0.9279 | 0.9272 | 0.9080 | 0.9319 | 0.9357 | 0.9299 | 0.9393 | |
| CT-image7 | 7 | 0.7447 | 0.7407 | 0.7029 | 0.7418 | 0.7487 | 0.7386 | 0.8484 |
| 8 | 0.7811 | 0.7704 | 0.7062 | 0.7826 | 0.7885 | 0.7856 | 0.8799 | |
| 9 | 0.8101 | 0.8059 | 0.7543 | 0.8127 | 0.8239 | 0.8067 | 0.9031 | |
| 10 | 0.8399 | 0.8441 | 0.7731 | 0.8304 | 0.8521 | 0.8469 | 0.9250 | |
| CT-image8 | 7 | 0.9291 | 0.9281 | 0.9040 | 0.9285 | 0.9315 | 0.9273 | 0.9263 |
| 8 | 0.9426 | 0.9421 | 0.9129 | 0.9396 | 0.9496 | 0.9394 | 0.9389 | |
| 9 | 0.9575 | 0.9597 | 0.9198 | 0.9588 | 0.9588 | 0.9598 | 0.9599 | |
| 10 | 0.9641 | 0.9648 | 0.9270 | 0.9650 | 0.9654 | 0.9655 | 0.9654 | |
| CT-image9 | 7 | 0.8585 | 0.8517 | 0.8228 | 0.8542 | 0.8620 | 0.8583 | 0.8670 |
| 8 | 0.8786 | 0.8719 | 0.8429 | 0.8733 | 0.8870 | 0.8754 | 0.8813 | |
| 9 | 0.9036 | 0.9009 | 0.8623 | 0.8964 | 0.9172 | 0.9041 | 0.9085 | |
| 10 | 0.9240 | 0.9111 | 0.8700 | 0.9206 | 0.9346 | 0.9267 | 0.9321 | |
| CT-image10 | 7 | 0.8711 | 0.8610 | 0.8456 | 0.8655 | 0.8752 | 0.8665 | 0.8656 |
| 8 | 0.9060 | 0.8969 | 0.8729 | 0.9044 | 0.9150 | 0.9095 | 0.9198 | |
| 9 | 0.9247 | 0.9258 | 0.8818 | 0.9261 | 0.9284 | 0.9266 | 0.9357 | |
| 10 | 0.9322 | 0.9372 | 0.9163 | 0.9348 | 0.9368 | 0.9335 | 0.9412 |