# Accurate Extraction of Cableways Based on the LS-PCA Combination Analysis Method
## 3 Experiment and Results
### Experimental Results and Analysis
\begin{table}
\begin{tabular}{c c c c c} \hline \hline \multirow{2}{*}{**Data Name**} & **Sample** & **Number of** & **Number of Real** & **Accuracy** \\  & **Number** & **Extracted Points** & **Points** & **Rate/\%** \\ \hline \multirow{4}{*}{Group One} & 1-1 & 1764 & 1873 & 94.18 \\  & 1-2 & 1634 & 1766 & 92.53 \\  & 1-3 & 1572 & 1711 & 91.88 \\  & 1-4 & 4951 & 5452 & 90.81 \\  & 1-all & 12,027 & 10,802 & 89.81 \\ \hline \multirow{4}{*}{Group Two} & 2-1 & 303 & 322 & 94.10 \\  & 2-2 & 204 & 238 & 85.71 \\  & 2-3 & 248 & 288 & 86.11 \\  & 2-4 & 1573 & 1695 & 92.80 \\  & 2-all & 2328 & 2543 & 91.54 \\ \hline \multirow{4}{*}{Group Three} & 3-1 & 185 & 226 & 81.86 \\  & 3-2 & 342 & 385 & 88.83 \\ \cline{1-1}  & 3-3 & 311 & 329 & 94.53 \\ \cline{1-1}  & 3-4 & 1620 & 1778 & 91.11 \\ \cline{1-1}  & 3-all & 2458 & 2718 & 90.43 \\ \hline \hline \end{tabular}
\end{table} 
Table 3: Statistical table showing the accuracy rate of ropeway point cloud segmentation and extraction. Figure 7: Data analysis chart: (**a**) represents the proportion of each sample within each group; (**b**) shows the change in extraction accuracy in each group. result, underline indicates the suboptimal result, the arrow pointing up indicates that the larger the value is, the better, and the arrow pointing down indicates the smaller the value is, the better). To facilitate the comparison of the extraction effects of different methods, a data analysis chart is generated, as shown in Figure 8. We found that our proposed method provides better results in terms of cable extraction accuracy and extraction time consumption. The data processing of the above three groups of test samples was carried out using the self-adaptive high-precision segmentation and extraction algorithm presented in this paper. However, despite the differences in scene complexities among the groups of samples, the proposed method has a good segmentation effect, a high level of statistical accuracy, and is capable of accurately extracting the ropeway. Compared to other methods, the \begin{table}
\begin{tabular}{c c c c c c} \hline \hline \multirow{2}{*}{**Name**} & \multicolumn{5}{c}{**Accuracy Rate/\% \(\uparrow\)**} \\ \cline{2-6}  & **RF** & **GBDT** & **SVM** & **VBF-Net** & **OURS** \\ \hline Number-1 & 68.52 & **92.88** & 67.74 & 78.30 & 92.52 \\ Number-2 & 75.44 & 80.39 & 72.13 & 73.62 & **95.08** \\ Number-3 & 76.09 & 67.08 & 43.66 & 65.05 & **83.43** \\ Number-4 & 86.38 & 84.26 & 78.55 & 86.82 & **92.18** \\ Number-5 & 75.20 & 67.24 & 73.03 & 64.93 & **85.27** \\ \hline \hline \end{tabular}
\end{table} 
Table 4: Accuracy statistics of cable extraction for five groups of samples by different methods (bold indicates the optimal result, underline indicates the suboptimal result, the arrow pointing up indicates that the larger the value is, the better, and the arrow pointing down indicates the smaller the value is, the better). Figure 8: Processing results of different methods when processing sample data: (**a**) extraction accuracy; (**b**) time-consuming. \begin{table}
\begin{tabular}{c c c c c c} \hline \hline \multirow{2}{*}{**Name**} & \multicolumn{5}{c}{**Time/ms \(\downarrow\)**} \\ \cline{2-5}  & **RF** & **GBDT** & **SVM** & **VBF-Net** & **OURS** \\ \hline Number-1 & 54.81 & 55.92 & 73.49 & 45.01 & **28.48** \\ Number-2 & 73.25 & 65.63 & 65.33 & 38.69 & **33.25** \\ Number-3 & 37.61 & 34.84 & 29.34 & **19.92** & 25.11 \\ Number-4 & 87.62 & 70.22 & 67.20 & 83.53 & **42.74** \\ Number-5 & 78.23 & 47.50 & 39.41 & 40.63 & **37.29** \\ \hline \hline \end{tabular}
\end{table} 
Table 5: Time-consuming statistics of cable extraction for five groups of samples by different methods (bold indicates the optimal result, underline indicates the suboptimal result, the arrow pointing up indicates that the larger the value is, the better, and the arrow pointing down indicates the smaller the value is, the better). method presented in this paper has the advantage of being able to adjust the segmentation parameters adaptively as well as extract cableways fast and accurately.