Physics – Optics
Scientific paper
Oct 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aipc..860..377h&link_type=abstract
INFORMATION OPTICS: 5th International Workshop on Information Optics (WIO'06). AIP Conference Proceedings, Volume 860, pp. 377-
Physics
Optics
Filters, Zone Plates, And Polarizers, Image Processing
Scientific paper
In this paper we address the common problem of the detection and identification of compact sources, such as stars or far galaxies, in Astronomical images. The common approach, that consist in applying a matched filter to the data in order to remove noise and to search for intensity peaks above a certain detection threshold, does not work well when the sources to be detected appear in large number over small regions of the sky due to the effect of source overlapping and interferences among the filtered profiles of the sources. A new class of filter that balances noise removal with signal spatial concentration is introduced, then it is applied to simulated astronomical images of the sky at 857 GHz. We show that with the new filter it is possible to improve the ratio between true detections and false alarms with respect to the matched filter. For low detection thresholds, the improvement is ~ 40%.
González-Nuevo Joaquin
Herranz Diego
López-Caniego Marcos
Luis Sanz José
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