hu_moments

rlemasklib.RLEMask.hu_moments()

Compute the 7 Hu moment invariants [1].

Hu moments are shape descriptors derived from normalized central moments, invariant under translation, scale, and rotation. The first 6 are also invariant under reflection; the 7th changes sign under reflection.

Equivalent to cv2.HuMoments(cv2.moments(mask)).

Returns:

Array of shape (7,) containing the Hu moment invariants.

Return type:

np.ndarray

References

[1]

Ming-Kuei Hu. Visual pattern recognition by moment invariants. IRE Transactions on Information Theory, 8(2):179–187, 1962. doi:10.1109/TIT.1962.1057692.