The LMI 3D scanner has three configurations:
The scanner needs to be re-calibrated every time the position of the camera's change.
It does not need to be recalibrated after moving or rotating / tilting the scanner.
Follow these steps carefully and in the right order.
Estimated time: 30 minutes
The scan-quality of the new configuration depends on the precision the calibration is completed.
Set the camera configuration (close, mid, far).
Secure one camera with one hand, while you unscrew it with the other hand.
Relocate it to another spot. Make sure both camera's will be positioned symmetrically and secure them again firmly.
set projector zoom (physical knob only)
Make sure the 3D scanner is connected to the laptop: 1 HDMI cable, and 2 blue USB cables.
Start up the projector.
Start FlexScan3D
Go to the Scanners tab
Set projector pattern to focus. The projector should show a crosshair-pattern.
Choose a calibration card and attach the feet so it can stand up on it's own.
Always treat the calibration cards with care.
Test that the two camera's are working: wave your hand in front of them, and check if the camera images on the laptop show the movement.
If one of the camera's doesn't work. Disable and then reenable this button.
If the camera is not recognised, restart FlexScan3D and try again.
With the projector pattern still set to focus, turn the white side of the calibration card to the cameras.
Align the center mark (bullseye) of the projection to the vertical red line in the camera view by moving the calibration card away or toward the scanner.
Mark this distance with some tape.
Set the projector focus. (Look at the actual calibration card, not the images from the cameras)
Set the projector pattern to white
Turn the calibration card so that the checkered side faces the cameras.
Loosen the screws on the focus ring (the smallest of the two) of both camera’s. Just a full turn should be enough.
Hover the mouse over the camera view. A window pops up with a section of the image in 100%. Set the camera focus while looking at this popup window for sharpness.
Fasten the lock screw without moving the focus ring.
Expose the image of the cameras well by changing the projector brightness.
Try to minimise under and over exposure on the calibration card.
Match the size of the squares of the calibration card.
Make sure sensible Filter values are set. (no documentation found on where the values are measured from. Possibly the CCD location of the camera's).
Click “Reset Calibration” to remove the previous calibration
Capture shots of the calibration board. Move the calibration board to a different place for the next capture. Stay within the camera image as this will result in an invalid capture. It's not necessary to overlap the board with previous captures. Take your time and be patient.
Try the following:
You will need 40 or more images for a good quality calibration.
When you feel ready, click calibrate
After a successful calibration, go to the projects tab to start 3D scanning