Astron. Astrophys. Suppl. Ser.
Volume 128, Number 2, March I 1998
|Page(s)||397 - 407|
|Published online||15 March 1998|
Structure detection in low intensity X-ray images
CEA, DSM/DAPNIA, SAP, CEA-Saclay, F-91191 Gif-sur-Yvette Cedex, France
Accepted: 10 July 1997
In the context of assessing and characterizing structures in X-ray images, we compare different approaches. Most often the intensity level is very low and necessitates a special treatment of Poisson statistics. The method based on wavelet function histogram is shown to be the most reliable one. We also present a multi-resolution filtering method based on the wavelet coefficients detection. Comparative results are presented by means of a simulated cluster of galaxies.
Key words: X-rays: general / methods: data analysis / methods: statistical / techniques: image processing
© European Southern Observatory (ESO), 1998