What units does the "Camera Alignment" dialogue box use?

Hi all,
I was wondering, what units does the “Camera Alignment” dialogue box use? Is it pixels or millimeters or inches?
Thank you!

I measured the ‘dot matrix’ that gets printed out during the calibration process that I used to calibrate my camera, and the dots are 12mm in diameter, and 17mm apart both horizontal and vertical, and they are 9mm if you measure the diagonal.

But I really don’t think it matters … I believe the ‘Camera Alignment’ routine is looking for a pattern, so it can evaluate distortion.

Just my thoughts on this… but since I just use the software - not write or develop it … I could be mistaken.

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