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| Paper: |
Combining Undersampled Dithered Data -- A Review of the Options |
| Volume: |
172, Astronomical Data Analysis Software and Systems VIII |
| Page: |
337 |
| Authors: |
Hook, Richard N.; Pirzkal, Norbert; Fruchter, Andrew S. |
| Abstract: |
Many imaging systems in astronomy have pixels which are too large to adequat ely sample the image falling on them. It is widely known that ``dithering'' -- shifting by small amounts between exposures -- can allow some of this lost information to be recovered. This technique is extensively used for HST WFPC2 and NICMOS imaging and is proposed for other systems. Algorithms have been developed, by the authors and others, to allow the effective combination of such dithered, undersampled data. This paper describes a simple imaging model which allows the limits of dithered imaging to be readil y appreciated and briefly reviews available software. The virtues and drawbacks of different methods are presented as a guide to workers with dithered data. An example using HST NICMOS data is given. |
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