There is a formula for moment of a contour image
Time is a characteristic of the circuit, the combined (summed) with all pixels of the contour. Point (p,q) is defined as:

Here p is the order of x, q is the order of y, where the order means, so to speak, the power to which the corresponding component is taken in the amount with other displayed.
But I do not quite understand what the formula mean X and U. that is, which they should have values.
People in the know, please explain. The Internet is nothing but the same formula and the same explanation is not found.