Fourier Transform, Optical Computing, Free Space Optics.
a global factor, this step is similar for the two algorithms. Denoting with an index 2 the 2D FT of the array A​ and by ​an index 1 the array made of the 1D FTs of its lines, we have, for each ​(j,k), where ​// denotes the Euclidean division, and Using one of these algorithms, one can thus