# Hu Moments

TODO:

* <https://learnopencv.com/shape-matching-using-hu-moments-c-python/#:~:text=Definition%20Hu%20Moments%20%28or%20rather%20Hu%20moment%20invariants%29,the%207th%20moment%E2%80%99s%20sign%20changes%20for%20image%20reflection.>
* <https://zhuanlan.zhihu.com/p/117344473>
* <https://www.researchgate.net/publication/224146066_Analysis_of_Hu's_moment_invariants_on_image_scaling_and_rotation>
* <https://learnopencv.com/find-center-of-blob-centroid-using-opencv-cpp-python/>

M(i,i) = sum(x, sum(y, (x^i)*(y^i) * I(x, y)))