Hi, i'm a novice in Opencv world, in the default.xml file to set the parameters for the calibration with a set of photos already acquired i set the number of raws and columns and the kind of pattern (symmetrical circle grid). I tried to change the "square size" but i noted no differencies. Is there a way to force the calcutor to acquire a photo with some missing parts of a raw of circles? Thanks for your help, forgive me for my bad english :)