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3d - MATLAB - What are the units of Matlab Camera Calibration Toolbox

When showing the extrinsic parameters of calibration (the 3D model including the camera position and the position of the calibration checkerboards), the toolbox does not include units for the axes. It seemed logical to assume that they are in mm, but the z values displayed can not possibly be correct if they are indeed in mm. I'm assuming that there is some transformation going on, perhaps having to do with optical coordinates and units, but I can't figure it out from the documentation. Has anyone solved this problem?

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If you marked the side length of your squares in mm, then the z-distance shown would be in mm.


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