3 papers
math.NA2026
Robust Model-Based Iteration for Passive Gamma Emission Tomography
Tommi Heikkilä, Sara Heikkinen, Riina Rimppi +1
Passive Gamma Emission Tomography (PGET) is an IAEA-approved technique for verifying spent nuclear fuel assemblies prior to geological disposal. Reconstructing the emission and att…
math.NA2025
Regularization with optimal space-time priors
Tatiana A. Bubba, Tommi Heikkilä, Demetrio Labate +1
We propose a variational regularization approach based on a multiscale representation called cylindrical shearlets aimed at dynamic imaging problems, especially dynamic tomography.…
math.NA2025
MultiResolution Low-Rank Regularization of Dynamic Imaging Problems
Tommi Heikkilä
MultiResolution Low-Rank decomposition is formulated for regularization of dynamic image sequences. The decomposition applies a local low-rank decomposition on a sequence of discre…