What are the second-moments of a region?

Question

I\'m currently working on replicating some of the functionality of Matlab\'s regionprops function in Octave. However, I have a bit of a hangup on a subset of the functional

Answer 1

I'm not exactly sure, but doesn't this refer to the statistical notion of moments (as in moment generating function):

Central Moments (moments about the mean):
   mu_k = E[(X − E[X])^k] ,    where E is the expected value

Thus the first four moments are respectively: {1, variance, skewness, kurtosis}.
But again I might be wrong ;)