Fig. 1. Leaves produce a mesh edge that affects the line results. (a) Original image; (b) Canny edge; (c) line detected result

Fig. 2. Steps of line detection in sorted edge points

Fig. 3. Steps of line detection in unsorted edge points

Fig. 4. Algorithm operation flow chart

Fig. 5. Efficiency comparison of two kinds of algorithms. (a) Time consumption comparison of each group of experiments; (b) time ratio of each group of experiments

Fig. 6. Straight line detection on a sorted edge image. (a) Analog image; (b) PPHT results; (c) our algorithm results

Fig. 7. Resistance of two algorithms to the boundary polymerization. (a) Original image; (b) Canny edge; (c) PPHT results; (d) our algorithm results

Fig. 8. Comparison of a building image detection results. (a) Original image; (b) Canny edge; (c) PPHT results; (d) our algorithm results

Fig. 9. Comparison of algorithm effect on a large picture. (a) Canny edge; (b) PPHT results; (c) our algorithm results