Hi all, According to the wikipedia page on image moments, central moments and raw moments are related as in this link: <http://en.wikipedia.org/wiki/Image_moment#Central_moments> http://en.wikipedia.org/wiki/Image_moment#Central_moments I’ve been trying to examine these relationships using the skimage.measure module. I created an ellipse image as per the measure region properties example (<http://scikit-image.org/docs/dev/auto_examples/plot_regionprops.html#example...> http://scikit-image.org/docs/dev/auto_examples/plot_regionprops.html#example...) and rotated it. Then I ran the following script: from skimage.measure import regionprops, moments, moments_central from skimage.morphology import label props = regionprops(image) # where `image` is the rotated ellipse x_bar, y_bar = props.centroid raw_moments = moments(image) central_moments = moments_central(image, x_bar, y_bar) Now according to the wikipedia page, central_moments[2,0] should be equal to: raw_moments[2,0] - x_bar * raw_moments[1,0] But that’s not working out. In fact, the value yielded by the above formula is much larger than what skimage says it should be. What am I missing? Thanks! -- JD