Calibrating cameras with OpenCV for smaller scenes


We’d like to use our ZED Mini camera in an underwater scene (small tank approx. 150 x 50 cm) and understand it will need re-calibrating. However, the documentation says to use a checkerboard of at least A3 size.

Is this relative? I.e., if we are only looking at a scene with max. distance of 150 cm, would a much smaller checkerboard suffice?

Indeed you will need to recalibrate.
either by using the provided tool called ZEDCalibration or by using the ability of the SDK to load an opencv calibration file:

With this later option the size of the pattern is not really a constraint as long as you have enough images.

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