# Multiscale Shape and Detail Enhancement from Multi-light Image Collections

I have been working on a practical implementation in Matlab of the algorithm Raanan Fattal suggested in the following paper.

I couldn't understand the meaning of eq. 11 on page 5:

g is a gaussian, 1D function (See section 4.1, page 3). While in this equation no parameters are given. D(i,j) is a matrix and C(i,j) is a number.

Could anyone explain what it means in case it is just a writing method I don't recognize?

Thanks

What the authors meant is to create a matrix of Weights, ${U}^{\left( i, j \right)}$.