Discrimination of point-like objects in astronomical images using surface curvature.

Details Discrimination of point-like objects in astronomical images using surface curvature. Discrimination of point-like objects in astronomical images using surface curvature.

Feb 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998a%26as..127..587l&link_type=abstract

Astronomy and Astrophysics Supplement, v.127, p.587-595

Astronomy and Astrophysics

Astrophysics

7

Techniques: Image Processing, Comets: General, P/Halley, Sun: Corona

Scientific paper

We present a method for the discrimination of point-like objects in astronomical images using surface curvature. The principal curvatures k_1 and k_2 are calculated using a local quadric approximation to the log of the intensity of the original image. The analysis of the (k_1, k_2) diagram allows to easily separate various shapes and to establish a criterion for discrimination. A mask is then generated and the invalid pixels are replaced by a local, pyramidal interpolation using a non-linear, multiresolution method. We present two applications, the discrimination and removal of stars from the dust tail of comet P/Halley observed while it was crossing the Milky Way, and the removal of cosmic ray impacts from images of the solar corona obtained with a space-coronagraph.

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