Inversion method for the restoration of chopped and nodded images

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Abstract
We present an iterative inversion method for the restoration of chopped and nodded images, typical of thermal IR astronomy with ground based telescopes. The method computes the smallest solution subjected to the constraint of positivity. The restored images exhibit artifacts, related to the chopping amplitude, which can be predicted by looking at the mathematical structure of the problem. However these effects can be strongly reduced by combing a few images taken with different chopping/nodding throws of small amplitude. Preliminary results on synthetic data are very promising. Restored images show high cosmetic quality and a typical restoration error smaller than 10 percent. We also present restorations of real images taken at the UKIRT telescope with the MAX camera. The availability of an image restoration method for mid-IR images would have a major impact on the telescope design and observing strategy at these wavelengths.

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