A multiscale regularized restoration algorithm for XMM-Newton data

Details A multiscale regularized restoration algorithm for XMM-Newton data A multiscale regularized restoration algorithm for XMM-Newton data

2001-06-07

arxiv.org/abs/astro-ph/0106138v1

Astronomy and Astrophysics

Astrophysics

To appear in the Proceedings of `Galaxy Clusters and the High Redshift Universe Observed in X-rays', XXIth Moriond Astrophysic

Scientific paper

We introduce a new multiscale restoration algorithm for images with few photons counts and its use for denoising XMM data. We use a thresholding of the wavelet space so as to remove the noise contribution at each scale while preserving the multiscale information of the signal. Contrary to other algorithms the signal restoration process is the same whatever the signal to noise ratio is. Thresholds according to a Poisson noise process are indeed computed analytically at each scale thanks to the use of the unnormalized Haar wavelet transform. Promising preliminary results are obtained on X-ray data for Abell 2163 with the computation of a temperature map.

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