Line Segment Detector
Detect straight line segments / extract a wireframe with a sub-pixel LSD detector: cleaner than Hough, no threshold tuning. Classic CV, in-browser.
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.
How to Use Line Segment Detector
- Upload an image: Upload one of the formats listed by the tool (JPG, PNG, WebP) and wait for the local preview.
- Adjust settings and process: Adjust the available controls, then run the selected image processing workflow in your browser.
- Review and download: Review the result, then download it in one of the formats offered by this tool.
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.