A new family of non--linear filters for background subtraction of wide--field surveys

Abstract

In this paper the definitions and the properties of a newle dedicated set of high-frequency filters based on smoothing-and-clipping are briefly described. New applications for reduction of wide--field 2048x2048 CCD spectral and direct images of a new deep survey KISS (KPNO International Spectral Survey) are also presented. The developed software is available both as a C subroutine and as an installed MIDAS environment command.

8 pages with 2 Postscript figures. The text with full figures obtainable from this http URL http://193.125.89.73/~akn/cont_with_figures.ps.gz