How do I obtain FFT of nabla operator F(▽）?
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I would like to write a matlab program that solves a least squares problem by using FFT(Fast Fourier Transform), but I don't know how to computes this in matlab:F(▽^T▽),where F means FFT,and ▽ is applied on an M×N image.
Waiting for your kindly help,
Thank you in advance.