Characterization of adaptive optics point spread function for anisoplanatic imaging. Application to stellar field deconvolution

The point spread function (PSF) of an adaptive optics system evolves in the Field Of View (FOV). This variation strongly limits the conventional decon volution methods for the processing of wide FOV images. A theoretical expre ssion of this PSF variation is derived. This expression is both validated o n simulations and experimental data. It is then applied to the a posteriori processing of stellar fields. Using the available prior information about the object (point-like sources), this technique allows the restoration of t he star parameters (positions and intensities) with a precision much better than the conventional methods, in a FOV much larger than the isoplanatic f ield.