7. The method of claim 1 , wherein the first weighting factor is a function of a first diffusion parameter and the second weighting factor is a function of a second diffusion parameter.
7. The method of claim 1 , wherein the first weighting factor is a function of a first diffusion parameter and the second weighting factor is a function of a second diffusion parameter. 9. The method of claim 7 , wherein the first and second diffusion parameters are less than 1.