Changing camera resolution should invalidate calibration

[funnbot]

The camera calibration should store the resolution it was calibrated at, and if changed in the UI, should invalidate the calibration.
Calibrations could potentially be saved as well, Allowing for an array per camera that is identified by its resolution.

Are there other values that should invalidate the calibration?

[ju1ce]

When changing resolution, it should be possible to calculate new calibration values, as only the ratios change. Automatically calculating this could be a good improvement to usability. Other settings shouldnt invalidate the calibration.

As for the calibration itself, it should be possible to automatically detect the quality of calibration and warn the user/reject the calibration in case it is not good enough. Personally, i couldnt find apropriate metrics to do this reliably: the reprojection error is not enough in some cases.

Other stuff that could be included:

• Calculating camera trajectory to ensure a variety of views
• Checking whether the grid is in aproximately correct position
• Checking calibration confidence values

[funnbot]

Maybe this isn't a concern, but could changing the resolution cause the image to be cropped?

[funnbot]

some SO questions on camera calibration correctness
https://stackoverflow.com/questions/18052337/how-to-verify-that-the-camera-calibration-is-correct-or-how-to-estimate-the-er
https://stackoverflow.com/questions/12794876/how-to-verify-the-correctness-of-calibration-of-a-webcam

Apparently reprojection error is the best available, besides some visual inspection, very difficult to tell.