6. The method as set forth in claim 5 , wherein each iteration of the estimating uses the estimated integrals of the previous iteration of the estimating as initial values and the estimating updates the estimated integrals only for the two smaller soft bin regions generated by the splitting.
5. The method as set forth in claim 2 , wherein the adjusting comprises: splitting a selected soft bin region into two smaller soft bin regions that together span the selected soft bin region wherein the splitting is performed in accordance with a binary decision tree defining the soft bin regions.