uniform_filter not working with NANs present?

Hi! I am trying to use ndimage's uniform_filter (for a simple local mean filtering) on a map-projected image that has NAN's at the border (basically the corners where the rotated map projected image does not fit into the rectangular grid). Is there a way, maybe in skimage, to use a uniform_filter on an array that contains NANs? ndimage' version does not cope with it correctly:

arr = array([np.nan, 1,2,3,4,5,np.nan]) arr

array([ nan, 1., 2., 3., 4., 5., nan])

nd.filters.uniform_filter(arr, 3)

array([ nan, nan, nan, nan, nan, nan, nan]) Cheers, Michael