  It has been shown that local algorithms based on grey-scale images sometimes
lead to asymptotically unbiased estimators for surface area and integrated mean
curvature. This paper extends the results to estimators for Minkowski tensors.
In particular, asymptotically unbiased local algorithms for estimation of all
volume and surface tensors and certain mean curvature tensors are given. This
requires an extension of the known asymptotic formulas to estimators with
position dependent weights.
