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In applied mathematics, moment invariants are functions of the moments of an object chosen so they do not change (are invariant) when the object is transformed in various ways. They are used in image processing, computer vision, and related fields.
The most common types of moment invariants are invariant to movement of the object (translation) and size of the object (scale invariance). Invariance to orientation of the object (rotational invariance) can also be implemented.