Extreme value and Haar series estimates of point process boundaries
  We present a new method for estimating the edge of a two-dimensional bounded set, given a finite random set of points drawn from the interior. The estimator is based both on Haar series and extreme values of the point process. We give conditions for various kind of convergence and we obtain remarkably different possible limit distributions. We propose a method of reducing the negative bias, illustrated by a simulation. 
St\'ephane Girard and Pierre Jacob
stat.ME math.ST stat.TH