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Line Segment Detector Online — Detect Lines & Wireframe (LSD)

A line segment detector finds straight edges in an image and returns them as clean, sub-pixel line segments — far tidier than raw Hough output and the basis of wireframe extraction, vanishing-point and layout analysis, document/whiteboard de-skew, and architectural structure detection. Upload a photo and the LSD-style detector traces every straight segment; view them overlaid on a dimmed photo or as a pure wireframe on black.

All processing runs locally in your browser. Your files never leave your device — no upload, no server, no signup required.

Frequently Asked Questions

How is this different from the Hough transform?

Hough votes for infinite lines and needs careful thresholds; this LSD-style FastLineDetector grows line support regions directly from the gradient field, returning discrete, sub-pixel-accurate segments with endpoints and almost no tuning — much cleaner for wireframes and structure.

What can I use line detection for?

Wireframe extraction, vanishing-point and room-layout estimation, document/whiteboard deskewing, lane and building-edge detection, and as structural features for alignment and matching.

What do the views show?

Overlay draws the detected segments in green over a dimmed copy of your photo so you can see what matched; wireframe draws them on black for a clean line-art / structural map.

Is my image uploaded anywhere?

No. Detection runs in your browser via OpenCV compiled to WebAssembly.

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