Exact Reconstruction and Reconstruction from Noisy Data with Anisotropic Total Variation

SIAM Journal on Mathematical Analysis, Volume 56, Issue 3, Page 2938-2967, June 2024.
Abstract. It is well-known that point sources with sufficient mutual distance can be reconstructed exactly from finitely many Fourier measurements by solving a convex optimization problem with Tikhonov-regularization (this property is sometimes termed superresolution). In the case of noisy measurements one can bound the reconstruction error in unbalanced Wasserstein distances or weak Sobolev-type norms. A natural question is to what other settings the phenomenon of superresolution extends. We here keep the same measurement operator but replace the regularizer to anisotropic total variation, which is particularly suitable for regularizing piecewise constant images with horizontal and vertical edges. Under sufficient mutual distance between the horizontal and vertical edges we prove exact reconstruction results and [math] error bounds in terms of the measurement noise.