fisheye
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checkboard cali
why not set checkboard's size_per_grid ?
DIM, K, D = get_K_and_D((6,9), '')
(6,9) is width and high, but not have grid size, exp. 50mm. "objp" don't consider grid size?
yes, 映射的过程, 和size无关, 棋盘格矫正方案, 重点在于点到点的映射