Two problems related to WF/PC imagery have been addressed: restoration in the presence of undersampling and restoration in the presence of a space-variant point-spread function.
It has been argued that the process of Richardson-Lucy (RL) restoration with
subsampling is not fully understood in the presence of
undersampling and that further work is required. A POCS-based variant of the
RL-algorithm with subsampling has been
suggested for further examination. Also an alternative model-based
algorithm for detecting irregular random missing data such as
cosmic ray (CR) hits has been proposed. The algorithm is based on a
spatially adaptive, dynamic -
clipping, which should
be optimal, at least for single-pixel CR-hits.
A novel, easily parallelizable algorithm for faithful image rotation has been stated. It is based on a sequence of three successive shears which in turn can efficiently be implemented using fast Fourier transforms (FFTs). The rotation algorithm is required within a joint restoration of multiple rotated WF/PC frames.
Finally a novel algorithm has been proposed for restoring full-frame WF/PC images distorted by a space-variant point spread function (SV-PSF). The algorithm is efficient and parallelizable. The algorithm allows several interesting generalizations which promise to either increase performance or restoration quality or both.
With these algorithms a comprehensive full-frame SV-PSF restoration of single or multiple WF/PC frames now appears to be feasible.