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Paper: Dithering, Sampling and Image Reconstruction
Volume: 216, Astronomical Data Analysis Software and Systems IX
Page: 521
Authors: Hook, R. N.; Fruchter, A. S.
Abstract: Many astronomical cameras (and spectrographs) are now routinely operated in a dithered mode - with small shifts between multiple exposures. Such dithering offers many advantages, particularly for the case in which the original detector pixels are too large to adequately sample the point-spread function of the image falling on them, but can pose a difficult image combination problem. We will describe the factors which affect the information content of dithered images and their characteristics. There are now several methods available for reconstructing a ``super image" of the sky from a set of such dithered images. The different algorithms, including the ``Drizzling" method developed by the authors, the method proposed recently by Tod Lauer, and more conventional approaches based on image interpolation will be compared and contrasted and examples of their use on real data given. Finally some comments about future developments, both of cameras and algorithms will be made.
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