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/* $Id: vimos_biascor.c,v 1.7 2015/08/07 13:07:15 jim Exp $
*
* This file is part of the VIMOS Pipeline
* Copyright (C) 2015 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
* $Author: jim $
* $Date: 2015/08/07 13:07:15 $
* $Revision: 1.7 $
* $Name: $
*/
/* Includes */
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <cpl.h>
#include "vimos_imaging_utils.h"
#include "vimos_mods.h"
#include <casu_fits.h>
#include <casu_utils.h>
#include <casu_stats.h>
/**@{*/
/*---------------------------------------------------------------------------*/
/**
\ingroup reductionmodules
\brief Correct input data for bias
\par Name:
vimos_biascor
\par Purpose:
Correct input data for bias
\par Description:
Two images are given -- one is the data for an observation, the
other is for a mean bias frame. The latter is subtracted from
the former. An overscan correction can also be done. If requested
the overscan and underscan regions can be trimmed. The modified
image replaces the input image.
\par Language:
C
\param infile
The input data image (overwritten by result).
\param biassrc
The input master bias image
\param overscan
If set, then the overscan correction is also done.
\param trim
If set, then the overscan and underscan regions are trimmed from
the image.
\param status
An input/output status that is the same as the returned values below.
\retval CASU_OK
if everything is ok
\retval CASU_FATAL
if image data fails to load or the image and the master bias have
different sizes.
\par QC headers:
None
\par DRS headers:
The following DRS keywords are written to the infile extension header
- \b BIASCOR
The name of the originating FITS file for the master bias image
- \b OSCOR_MED:
The value of the overscan correction applied (if requested)
- \b OSCOR_RMS:
The rms of the overscan correction applied (if requested)
- \b TRIMMED:
True if the input frame has been trimmed.
\author
Jim Lewis, CASU
*/
/*---------------------------------------------------------------------------*/
int vimos_biascor(casu_fits *infile, casu_fits *biassrc, int overscan,
int trim, int *status) {
cpl_propertylist *ehu;
cpl_image *im,*bm,*subset;
float *idata,*work,med,sig,oscor;
int npi,n,i,j,k,nx;
const char *fctid = "vimos_biascor";
/* Inherited status */
if (*status != CASU_OK)
return(*status);
/* See if this file has already been done */
ehu = casu_fits_get_ehu(infile);
if (cpl_propertylist_has(ehu,"ESO DRS BIASCOR"))
return(*status);
/* Get the images and check the dimension to make sure they match */
im = casu_fits_get_image(infile);
bm = casu_fits_get_image(biassrc);
if (casu_compare_dims(im,bm) != CASU_OK) {
cpl_msg_error(fctid,"Object and bias data array dimensions don't match");
FATAL_ERROR
}
/* If doing the overscan correction, then get the median of counts
in the overscan strip in both images */
if (overscan) {
idata = cpl_image_get_data(im);
nx = cpl_image_get_size_x(im);
npi = (overlim[1] - overlim[0] + 1)*(overlim[3] - overlim[2] + 1);
work = cpl_malloc(npi*sizeof(float));
n = 0;
for (j = overlim[2]; j <= overlim[3]; j++) {
for (i = overlim[0]; i <= overlim[1]; i++) {
k = (j-1)*nx + i - 1;
work[n++] = idata[k];
}
}
casu_medmad(work,NULL,n,&med,&sig);
sig *= 1.48;
freespace(work);
oscor = med -
cpl_propertylist_get_float(casu_fits_get_ehu(biassrc),
"ESO QC OSCAN_MED");
} else {
oscor = 0.0;
}
/* Just use the cpl image routines to do the arithmetic */
if (cpl_image_subtract(im,bm) != CPL_ERROR_NONE)
FATAL_ERROR
if (overscan) {
if (cpl_image_subtract_scalar(im,(double)oscor) != CPL_ERROR_NONE)
FATAL_ERROR
}
/* Trim the image if that has been requested */
if (trim) {
subset = cpl_image_extract(im,(cpl_size)(underlim[1]+1),
(cpl_size)underlim[2],
(cpl_size)(overlim[0]-1),
(cpl_size)underlim[3]);
casu_fits_replace_image(infile,subset);
}
/* Now put some stuff in the DRS extension... */
if (casu_fits_get_fullname(biassrc) != NULL)
cpl_propertylist_update_string(ehu,"ESO DRS BIASCOR",
casu_fits_get_fullname(biassrc));
else
cpl_propertylist_update_string(ehu,"ESO DRS BIASCOR",
"Memory File");
cpl_propertylist_set_comment(ehu,"ESO DRS BIASCOR",
"Image used for bias correction");
cpl_propertylist_update_float(ehu,"ESO DRS OSCOR",oscor);
cpl_propertylist_set_comment(ehu,"ESO DRS OSCOR",
"level of overscan correction applied");
if (overscan) {
cpl_propertylist_update_float(ehu,"ESO DRS OSCAN_MED",med);
cpl_propertylist_set_comment(ehu,"ESO DRS OSCAN_MED",
"median in overscan");
cpl_propertylist_update_float(ehu,"ESO DRS OSCAN_RMS",sig);
cpl_propertylist_set_comment(ehu,"ESO DRS OSCAN_RMS",
"rms in overscan");
}
cpl_propertylist_update_bool(ehu,"ESO DRS TRIMMED",trim);
cpl_propertylist_set_comment(ehu,"ESO DRS TRIMMED",
"Has image been trimmed?");
/* Get out of here */
GOOD_STATUS
}
/**@}*/
/*
$Log: vimos_biascor.c,v $
Revision 1.7 2015/08/07 13:07:15 jim
Fixed copyright to ESO
Revision 1.6 2015/06/25 11:54:07 jim
Fixed includes to casu
Revision 1.5 2015/01/29 12:07:30 jim
Modified comments
Revision 1.4 2013/11/21 09:39:08 jim
detabbed
Revision 1.3 2013/11/04 10:03:55 jim
Fixed overscan keyword for BIAS frame
Revision 1.2 2013/11/04 06:01:17 jim
changed name of qc parameters
Revision 1.1.1.1 2013-10-24 08:36:12 jim
Initial import
*/
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