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Paper: On the Combination of Undersampled Multiframes
Volume: 77, Astronomical Data Analysis Software and Systems IV
Page: 456
Authors: Adorf, H.-M.
Abstract: Some cameras with digital detectors, such as the Wide Field and Planetary Camera 2 onboard the Hubble Space Telescope, undersample the joint point spread function of telescope and camera optics. In order to overcome undersampling, two or more frames of the same field may be obtained which are shifted with respect to each other by fractions of a pixel. During data analysis such multiframes must be ``registered'' and ``combined''. This contribution investigates a novel method for merging undersampled multiframes based on projections onto convex sets (POCS). The method does not require a point-spread function; it can cope with missing data, and may incorporate prior knowledge such as non-negativity and band-limit constraints.
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