Calibration Guide

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Calibration Guide

  1. 1. CALIBRATION
  2. 2. Calibration is required to calculate scene configuration for each camera: 1. Position in 3D space 2. Orientation 3. (optional) Field of view (if you don’t know FOV for your camera) 3 Z Y 1 2 X
  3. 3. Calibration in iPi DMC is based on glowing marker tracking in 3D space You can use a flashlight with Mini Maglite in candle its reflector removed, or mode is recommended other small glowing object
  4. 4. Step 1: run iPiRecorder and • turn on Calibration mode checkbox (for Sony PS Eye cameras) • or set Exposure to reasonably small value (for DirectShow-compatible web cameras)
  5. 5. Image from cameras should look dim in calibration mode
  6. 6. Step 2: record calibration video a. Start video recording b. First couple of seconds of calibration video should contain background only (no marker) c. Then move slowly the marker through your entire capture volume (front-top-right- bottom-left-back-top-right-bottom-left)
  7. 7. Start from top and move the marker in a descending No marker! spiral motion 00:02 00:04 00:06 00:08 00:10 00:12 00:14 00:16 00:18 00:20 00:22 00:24
  8. 8. Move the marker in a descending spiral motion 00:26 00:28 00:30 00:32 00:34 00:36 00:38 00:40 00:42 00:44 00:46 00:48
  9. 9. Marker should always be visible in all cameras and never obscured by human body 00:50 00:52 00:54 00:56 00:58 01:00 01:02 01:04 01:06 01:08 01:10 01:12
  10. 10. d. Put the marker to the ground at each corner and at the center of capture volume Capture Volume 
  11. 11. Step 3: stop recording and check recorded video At least first two seconds of video does not contain marker There is no motion blur (image of marker looks like a round spot rather than an ellipse or a luminescent line) Marker is always visible in all cameras and never obscured by human body
  12. 12. Step 4: process calibration video in iPiStudio • Please refer to the video tutorial: Calibration_Tutorial.mp4
  13. 13. Resulting scene should look like this: Green points designate correctly detected 3D marker positions. Red points designate misdetected marker positions. 10-20% of red points should be considered normal. Calibration should work correctly if you have at least 70% of green points.
  14. 14. Step 5: mark ground points (at least three) Go to frame where marker is on the ground and press Mark as ground button
  15. 15. The system uses ground points to calculate ground plane. You need to define at least 3 ground points.
  16. 16. #1 measure vertical distance between optical axis of camera and ground Step 6: set scene scale based on the measured camera height
  17. 17. Note: Height of camera can be used only if ground is marked. If ground plane is not defined, use distance between camera #1 and #2 to set scene scale #1 #2
  18. 18. Step 7: save result into *.scene.xml file Click here to save scene parameters to XML file

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