Hi,
Per resolution distortion is a legacy behavior, for SDK version < 3.5.
The distortion is the same for every resolution so a new field was added, if it is available it overwrites per resolution distortion. It is an extend (more coefficient) of the per resolution distortion.
If you want more information about them you can take a look at this documentation:
https://docs.opencv.org/4.x/d9/d0c/group__calib3d.html#ga7dfb72c9cf9780a347fbe3d1c47e5d5a
we follow the same convention.
Our self calibration does not update the distortion.
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