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ok, that's a bit tricky ;)

fourierDescriptor() expects a list of points, that would be a rank 1, 2 channel array.

if you started like this:

a = np.array([[12, 11], [10, 9]])

you'll have to reshape it:

 b = a.reshape(3,1,2)

also, it needs float or double type, not int currently (that's a bug), so, another conversion:

c = np.asarray(b, np.float32)

now you can calculate proper fourierDescriptors:

cv2.ximgproc.fourierDescriptor(c)

array([[[11., 10.]],

       [[ 1.,  1.]]], dtype=float32)

ok, that's a bit tricky ;)

fourierDescriptor() expects a list of points, that would be a rank 1, 2 channel array.

if you started like this:

a = np.array([[12, 11], [10, 9]])

you'll have to reshape it:

 b = a.reshape(3,1,2)
a.reshape(2,1,2)

also, it needs float or double type, not int currently (that's a bug), so, another conversion:

c = np.asarray(b, np.float32)

now you can calculate proper fourierDescriptors:

cv2.ximgproc.fourierDescriptor(c)

array([[[11., 10.]],

       [[ 1.,  1.]]], dtype=float32)