Camera Calibration
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Hello.
This is a new starling 2 drone. I am trying to calibrate the cameras, but it seems difficult. When chess board is placed inside rectangle, the rectangles doesn't fill most times, sometimes, i get detections, sometimes i don't. It took several minutes to get a 40% collection rate. Is the calibration supposed to be this difficult? or is there a technique to this? I have seen the video on the documentation website for this, and it was seamlessly easy. Please let me know if I am doing it wrongly?
Expecting your response soon. Thanks.
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Hello @taiwohazeez,
it seems your calibration pattern is significantly warped. It needs to be as straight as possible.
I personally like to perform calibration by displaying a pattern on an LCD screen (flat), which more or less guarantees it being straight. For a monocular calibration, the size of the box does not make any difference (no scale is recovered from the calibration). If you use that approach, then you actually have to move the camera as opposed to moving the pattern, unless you want to move the screen, which actually would be possible on a laptop. Watch out for reflections from screen and also sometimes setting manual exposure also helps (i won't go into detail how to do that here).
You could take your calibration sheet and glue it to a rigid flat surface, but even that can be tricky, since paper glue can cause wrinkles on paper, but those should not be as bad as the deformation seen in your screen shot.
Alex
