| | Selection | | The 1st selection used in Guo et al. [12] with | The 2nd selection used in the proposed method with | The 3rd selection with | | Pairs (, ) | The number of black pixels | Pairs (, ) | The number of black pixels | Pairs (, ) | The number of black pixels | | | | | | |
| | (0, 1) | 322 | 352 | (0, 4) | 389 | 641 | (0, 8) | 389 | 734 | | (2, 3) | 320 | 354 | (1, 5) | 391 | 725 | (1, 9) | 391 | 826 | | (4, 5) | 386 | 540 | (2, 6) | 364 | 757 | (2, 10) | 364 | 884 | | (6, 7) | 545 | 547 | (3, 7) | 421 | 712 | (3, 11) | 421 | 873 | | (8, 9) | 611 | 758 | (8, 15) | 734 | 672 | (4, 15) | 641 | 672 | | (10, 11) | 801 | 668 | (9, 14) | 826 | 675 | (5, 14) | 725 | 675 | | (12, 13) | 672 | 674 | (10, 12) | 884 | 711 | (6, 12) | 757 | 711 | | (14, 15) | 672 | 672 | (11, 13) | 873 | 741 | (7, 13) | 712 | 741 |
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