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POST /api/detect-a4

Purpose: Calibrate measurement scale using A4 reference sheet Input: session_id (form field), file (image upload) Output:

{
  "mm_per_pixel": 0.2625,
  "message": "A4 detected and perspective corrected successfully."
}

POST /api/auto-measure

Purpose: Detect and measure all objects on A4 sheet Input: session_id (form field), file (image upload) Output:

{
  "objects": [
    {
      "id": 0,
      "width_mm": 85.4,
      "height_mm": 54.2,
      "area_mm2": 4629.3,
      "shape_type": "polygon",
      "polygon_points": [[x1,y1], [x2,y2]],
      "centroid": [400, 565],
      "angle_deg": 15.3,
      "circularity": 0.891
    }
  ],
  "count": 1,
  "selected_id": 0,
  "warped_b64": "data:image/png;base64,..."
}

POST /api/manual-distance

Purpose: Measure distance between two user-clicked points Input: session_id, points Output: {"distance_mm": 127.8}

POST /api/manual-polygon

Purpose: Measure area of user-drawn polygon Input: session_id, points Output: {"area_mm2": 8540.6}

GET /api/warped-frame/{session_id}

Purpose: Retrieve calibrated warped A4 image for manual mode overlay Output: PNG image (binary)

GET /api/warp-dims

Purpose: Get fixed warped image dimensions for frontend scaling Output: {"warp_width": 800, "warp_height": 1131}