Centroid

Notes:

Calculate the centroid and slopes for all apertures:
The structure of the return on the function is a row vector of slopes:
[s_x(0,0),.,s_x(0,N),.,s_x(M,0),.,s_x(M,N),s_y(0,0),.,s_y(0,N),.,s_y(M,0),.,s_y(M,N)]

Centroid calculation using thresholding method.

That Nx and Ny parameters are used in WFS, what are those parameter used for in WFS? I think I just follow them.
On the comment of the WFS code:
Nx = paramsSensor['Nx'] # Samples on the x-axis per lenslet