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Ah, as usual, user error.

I was passing the number of squares in the format that findChessboard needs, using the inner corners.

`cv::Ptr<cv::aruco::charucoboard> board = cv::aruco::CharucoBoard::create(7, 5, 0.04f, 0.02f, dictionary);'

or indeed any chAruco board, needs the actual number of squares, in this case, 8 x 6.

Ah, as usual, user error.

I was passing the number of squares in the format that findChessboard needs, using the inner corners.

cv::Ptr<cv::aruco::CharucoBoard> board = cv::aruco::CharucoBoard::create(7, 5, 0.04f, 0.02f, dictionary);'
dictionary);