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. 2019 Mar 23;21(3):318. doi: 10.3390/e21030318

Table 6.

Comparison of Kapur’s entropy and Otsu methods based on WOA-DE algorithm.

Images K PSNR SSIM FSIM
Otsu Kapur Otsu Kapur Otsu Kapur
Image1 4 20.3428 17.7781 0.5798 0.4681 0.7771 0.734
6 22.6702 24.977 0.6815 0.6559 0.8458 0.8197
8 24.0516 28.6092 0.7446 0.8033 0.9122 0.8798
10 25.2164 30.6687 0.7898 0.833 0.9225 0.9039
12 26.1897 32.2054 0.8059 0.8672 0.926 0.9271
Image2 4 18.459 18.6558 0.608 0.5266 0.7582 0.7151
6 20.9182 22.2481 0.7095 0.652 0.8245 0.7921
8 24.5622 24.8821 0.8164 0.7361 0.8684 0.8435
10 25.7585 27.9116 0.8421 0.8064 0.8878 0.8745
12 28.4144 29.8805 0.8964 0.8505 0.917 0.9041
Image3 4 17.5776 20.8247 0.6971 0.7109 0.6972 0.7182
6 22.7555 23.6059 0.7431 0.7592 0.7469 0.7619
8 27.8967 26.0132 0.7948 0.8036 0.795 0.8017
10 29.5405 29.0184 0.8341 0.8433 0.8322 0.8329
12 31.6891 32.6886 0.8633 0.8729 0.8619 0.8646
Image4 4 19.0015 23.013 0.6151 0.612 0.7012 0.6484
6 24.4296 26.9872 0.7631 0.7188 0.8129 0.7665
8 27.9781 29.7682 0.8434 0.7953 0.8793 0.8415
10 32.0713 31.7603 0.8888 0.8456 0.9193 0.8907
12 33.9227 33.096 0.9194 0.8767 0.9431 0.9203
Image5 4 23.4509 23.4495 0.8082 0.7231 0.8469 0.7925
6 27.2396 27.2417 0.8948 0.8286 0.9142 0.8716
8 29.6073 29.5852 0.926 0.8903 0.9415 0.9229
10 31.5024 31.4704 0.9345 0.919 0.9585 0.9452
12 32.9105 32.782 0.9457 0.9429 0.9672 0.9614
Image6 4 19.2192 20.597 0.6626 0.5995 0.7712 0.7443
6 23.4934 25.4883 0.8061 0.7587 0.8673 0.8562
8 27.6467 28.6898 0.8732 0.8427 0.9192 0.9136
10 29.7289 31.292 0.9104 0.9002 0.9416 0.9489
12 32.0406 32.7058 0.9384 0.9227 0.9599 0.9615
Image7 4 18.9474 23.2367 0.7898 0.8494 0.848 0.9012
6 23.6742 26.6481 0.8938 0.9136 0.9198 0.9469
8 26.8294 29.1886 0.9383 0.9422 0.9513 0.9671
10 30.559 31.2154 0.9626 0.9648 0.9728 0.9773
12 32.9021 32.7203 0.9781 0.9726 0.9828 0.9834
Image8 4 20.3695 19.4801 0.5372 0.4881 0.786 0.7807
6 23.4982 25.5717 0.6365 0.7043 0.8643 0.8705
8 25.5399 27.8173 0.7326 0.7823 0.9007 0.9102
10 27.2326 30.6727 0.8174 0.8479 0.9228 0.9361
12 30.4945 32.0442 0.8483 0.8849 0.943 0.9514
Image9 4 20.5858 22.1696 0.6759 0.6581 0.8498 0.8671
6 25.1403 26.3449 0.7465 0.7492 0.9174 0.9197
8 28.672 29.2954 0.7938 0.8082 0.9476 0.9524
10 30.9026 31.126 0.8711 0.8716 0.9664 0.9661
12 32.5855 32.9878 0.9012 0.8757 0.9761 0.9764
Image10 4 20.2121 22.6128 0.7399 0.7551 0.8312 0.8499
6 24.9168 27.0397 0.8128 0.8355 0.9075 0.9179
8 29.1254 29.5441 0.8865 0.8649 0.9503 0.947
10 30.9532 31.447 0.9196 0.8774 0.9641 0.9645
12 32.5129 32.8351 0.9284 0.8923 0.9729 0.9734
Rank 2(11) 1(39) 2(29) 1(21) 1(25) 1(25)