Power Spectrum Extended: Preliminary results
Résumé
We propose, in the framework of short-exposure high-angular-resolution imaging (Lucky Imaging, speckle techniques), a simple improvement of the original Labeyrie's speckle interferometry technique. This new method, denoted as Power Spectrum Extended, allows to perform direct imaging of extended objects in the case of post-adaptive optics images and/or small diameter telescopes. The algorithm works in the Fourier domain. It combines informations from the average power spectrum of an ensemble of images with phase information estimated from an ad hoc shift-and-add process. It can be used together with a Lucky Imaging selection process. Preliminary results are presented, with application to images of both an astronomical object and an artificial satellite.