SYNOPSIS

esorex fors_img_screen_flat [OPTIONS] FILE.sof

DESCRIPTION

After bias subtraction, the input flat field frames are combined using the given stack method. The combined frame is finally normalised dividing it by its large scale illumination trend. The large scale trend is obtained by applying a median filter with a large kernel. To avoid boundary effects, the median filter is applied only to the specified region.

The overscan regions, if present, are removed from the result.

Input files:

  DO category:               Type:       Explanation:         Required:
  SCREEN_FLAT_IMG            Raw         Screen flat field    Y
  MASTER_BIAS                Raw         Master bias          Y

Output files:

  DO category:               Data type:  Explanation:
  MASTER_SCREEN_FLAT_IMG     FITS image  Master screen flat field

OPTIONS

--stack_method <str>

Frames combination method (str; default: 'average'). The full name of this option for the EsoRex configuration file is fors.fors_img_screen_flat.stack_method [default = average].

--minrejection <long>

Number of lowest values to be rejected (long; default: 1). The full name of this option for the EsoRex configuration file is fors.fors_img_screen_flat.minrejection [default = 1].

--maxrejection <long>

Number of highest values to be rejected (long; default: 1). The full name of this option for the EsoRex configuration file is fors.fors_img_screen_flat.maxrejection [default = 1].

--klow <float>

Low threshold in ksigma method (float; default: 3.0). The full name of this option for the EsoRex configuration file is fors.fors_img_screen_flat.klow [default = 3.0].

--khigh <float>

High threshold in ksigma method (float; default: 3.0). The full name of this option for the EsoRex configuration file is fors.fors_img_screen_flat.khigh [default = 3.0].

--kiter <long>

Max number of iterations in ksigma method (long; default: 999). The full name of this option for the EsoRex configuration file is fors.fors_img_screen_flat.kiter [default = 999].

--xradius <long>

Median filter x radius (unbinned pixels) (long; default: 50). The full name of this option for the EsoRex configuration file is fors.fors_img_screen_flat.xradius [default = 50].

--yradius <long>

Median filter y radius (unbinned pixels) (long; default: 50). The full name of this option for the EsoRex configuration file is fors.fors_img_screen_flat.yradius [default = 50].

--degree <long>

Degree of fitting polynomial (long; default: -1). The full name of this option for the EsoRex configuration file is fors.fors_img_screen_flat.degree [default = -1].

--sampling <long>

Sampling interval for fitting (long; default: 100). The full name of this option for the EsoRex configuration file is fors.fors_img_screen_flat.sampling [default = 100].

Note that it is possible to create a configuration file containing these options, along with suitable default values. Please refer to the details provided by the 'esorex --help' command.

VERSION

fors_img_screen_flat 5.3.5

AUTHOR

Jonas M. Larsen <[email protected]>

LICENSE

This file is currently part of the FORS Instrument Pipeline Copyright (C) 2002-2011 European Southern Observatory

This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA