NOTE ✦ CW-LP — Culvert Wireframe Line Parser Training-free pipeline for box-culvert joint-line detection. Inline math Rm×n\mathbb{R}^{m\times n}Rm×n and a display block: MProj-IoU=1N∑i=1N∣P^i∩Pi∣∣P^i∪Pi∣\mathrm{MProj\text{-}IoU} = \frac{1}{N}\sum_{i=1}^{N}\frac{|\hat P_i \cap P_i|}{|\hat P_i \cup P_i|} MProj-IoU=N1i=1∑N∣P^i∪Pi∣∣P^i∩Pi∣