I saw some python codes online for detecting aruco markers, and I combined them together. This is the code: https://github.com/czjczjczj1/aruco/blob/780d4e724494893d45c0e9f39605081378e8c54a/aruco_detection_test.py#L21-L22
I wanted to draw the x-, y-, z-axis too, but I got an error saying:
for i in range(len(tvecs)):
TypeError: object of type 'NoneType' has no len()
So why rvecs and tvecs are NoneType? How can I get two arrays?
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