AI-powered building extraction from floor plans using Meta's SAM
Upload PNG/JPG images • Convert PDF to PNG externally
📁 Step 1: Upload Floor Plan
Upload a PNG, JPG, or PDF of your floor plan
🖼️
Drag & drop or click to upload
Supported: PNG, JPG, PDF (first page)
🎯 Step 2: Draw Bounding Box & Refine
Fast & Precise Workflow:
✅ Fast: Draw bbox in 2 seconds (80% accurate)
✅ Precise: Refine with 2-5 clicks (100% accurate)
✅ Easy: Simple two-step process
✅ Draw a box around your building: Click and drag to create a bounding box. SAM2 will extract exactly what's inside the box!
💡 Higher = cleaner geometry with fewer points
✅ Draw a box around your region of interest. SAM will find multiple objects inside your box for you to choose.
✅ Click on the image to add points around your building (at least 3).
➕ Left click to add points • ↩️ Undo to remove last • 🧹 Clear to start over • ✅ Segment to run.
🎯 Point Prompts: Click on the image to add positive (+) points (include) and negative (-) points (exclude).
Example: Place positives on outer walls; place negatives on rooms/text to exclude.
0 positive, 0 negative
✅ Smart Building Envelope Detection: Automatically detects the outer boundary of your building using multiple AI methods.
🏢 Perfect for finding the red outline in architectural plans.
✂️ Optional: Draw a crop box to focus on a specific area, or leave as-is to analyze the full image.
🚀 Click Continue when ready!
✨ Add/Remove Mode (Like Meta's SAM Demo)
How to use:
Make sure "Add Mask +" is selected (orange)
Hover over building → orange preview appears
Click to ADD that area to selection
To remove parts: Click "Remove Area -" (red)
Click unwanted areas → they disappear from selection
Click "Confirm" when happy with selection!
💡 Tip: Use "Large" to select entire buildings with one click!
No areas selected yet. Click to start!
📐 Grid Snapping
Snap vertices to grid for cleaner edges
💡 Tip: Start with 10px. Increase for simpler shapes, decrease for more detail.
🎯 Bbox + Refine Mode - Best of Both Worlds!
Why This is Best:
✅ Fast: Draw bbox in 2 seconds (80% accurate)
✅ Precise: Refine with 2-5 clicks (100% accurate)
✅ Easy: Simple two-step process
✅ Professional: Industry-standard workflow
📦 Step 1: Draw Bounding Box
Draw a rough box around the building (doesn't need to be perfect!)
✅ Step 2 of 2: Refine the Mask
Initial mask created! Now add/remove areas to make it perfect:
Hover over areas to add or remove
📐 Grid Snapping
Snap vertices to grid for cleaner edges
💡 Tip: Start with 10px. Increase for simpler shapes, decrease for more detail.
🤖 Step 3: AI Segmentation
SAM is analyzing your floor plan...
This may take 12-25 seconds (finding 50-100+ objects) ⚡
🏢 Step 4: Select the Building
Click on the object that represents your building
⚠️ Tip: The LARGEST object is usually the main building. Avoid selecting text, legends, parking areas, or annotations. If you don't see the right building, go back and try cropping more precisely.