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Table 3 Number of detected segments (NS d ) and percentage of connected segments (CS) for the ten test images

From: A variant of the Hough Transform for the combined detection of corners, segments, and polylines

  PPHT LSD HT3D
  NS d CS(%) NS d CS(%) NS d CS(%)
1 352 0 329 21 263 67
2 434 0 515 13 335 74
3 1847 0 751 17 912 69
4 2376 0 1274 15 1213 77
5 1655 0 838 13 907 63
6 2768 0 1034 20 1321 62
7 1079 0 1058 14 924 76
8 2622 0 1112 14 1269 62
9 1295 0 839 15 738 71
10 2194 0 1301 28 1355 77
  1. The percentage of connected segments is indicative of the ability of a segment detector to provide chains of segments corresponding to the polygonal image contours. According to this measure, the proposed method (HT3D) produces clearly better results than the other two approaches