Code I: Known PSF

In image restoration, the PSF is usually regarded as known. For this standard case, the ideas of § 2 lead to the following optimization problem: the quantities and are determined by maximizing the objective function

Here denotes the reduced log-likelihood of the observed image and is given by

with

The regularization parameter controls the weight given to the regularization of , and the Lagrange multiplier allows overall flux conservation to be imposed.