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/* $Id: vmmosfringes.c,v 1.2 2013-03-25 11:43:04 cgarcia Exp $
*
* This file is part of the VIMOS Pipeline
* Copyright (C) 2002-2004 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 Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/*
* $Author: cgarcia $
* $Date: 2013-03-25 11:43:04 $
* $Revision: 1.2 $
* $Name: not supported by cvs2svn $
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <string.h>
#include <pilmemory.h>
#include <pilmessages.h>
#include <cpl_msg.h>
#include <piltranslator.h>
#include "vmimage.h"
#include "vmwindowtable.h"
#define MAX_COMMENT_LENGTH (80)
int
VmSpFringCorr(VimosImage **mosImages, VimosWindowTable **winTables,
int mosCount, int pixels, int interpolate)
{
char task[] = "VmSpFringCorr";
int xStart = 0;
int xEnd = 0;
int j, i, imaX, imaY;
int left,right;
int badObjects;
int startFound;
float valEnd,valStart,m,value;
VimosImage *meanSkyImage = NULL;
VimosImage **subMosImages = NULL;
VimosWindowObject *object;
VimosWindowSlit *wSlit = NULL;
/* char comment[MAX_COMMENT_LENGTH]; */
/* int startPixelSub = 0; */
/* float startWLenSub=7700.; */
/* float wLenStart,wLenInc; */
/* double dValue; */
subMosImages = (VimosImage **)pil_calloc(mosCount, sizeof(VimosImage *));
if (!subMosImages) {
cpl_msg_error(task, "Failure creating list of 2D sky images");
return EXIT_FAILURE;
}
for (i = 0; i < mosCount; i++) {
subMosImages[i] = duplicateImage(mosImages[i]);
wSlit = winTables[i]->slits;
while(wSlit) {
object = wSlit->objs;
while(object) {
for(imaX=0; imaX<subMosImages[i]->xlen; imaX++){
left=right=1;
/* starting end ending pixel */
xStart = wSlit->specStart + object->objStart - pixels;
xEnd = wSlit->specStart + object->objEnd + pixels;
/* check pixels */
if(xStart-2<0) {
left=0;
xStart=0;
}
if(xEnd+2>wSlit->specEnd) {
right=0;
xEnd=wSlit->specEnd;
}
if(interpolate) {
valStart=valEnd=0.;
/* simple linear interpolation */
if (left) {
for(j=xStart-2; j<=xStart; j++)
valStart += subMosImages[i]->data[imaX + j*subMosImages[i]->xlen];
valStart/=3;
value = valStart;
m = 0.;
}
if (right) {
for(j=xEnd+2; j>=xEnd; j--)
valEnd += subMosImages[i]->data[imaX + j*subMosImages[i]->xlen];
valEnd/=3;
value = valEnd;
m = 0.;
}
if(left && right) {
m = (valEnd-valStart)/((float)(xEnd)-(float)(xStart));
value = valStart;
}
for(imaY=xStart; imaY<=xEnd; imaY++)
subMosImages[i]->data[imaX + imaY*subMosImages[i]->xlen] = m*(imaY-xStart) + value;
}
else
for(imaY=xStart; imaY<=xEnd; imaY++)
subMosImages[i]->data[imaX + imaY*subMosImages[i]->xlen] = -32000.;
}
object=object->next;
}
if (wSlit->next) wSlit = wSlit->next;
else {
while(wSlit->prev) wSlit = wSlit->prev; /* rewind wSlit */
break;
}
}
}
/* compute mean sky image */
meanSkyImage = frCombMedian(subMosImages,mosCount,1);
/* Masking of blue wavelenght. FIXME - should be applicated? */
/*
readDoubleDescriptor(winTables[0]->descs, pilTrnGetKeyword("WlenStart"),&dValue, comment);
wLenStart = (float) dValue;
readDoubleDescriptor(winTables[0]->descs, pilTrnGetKeyword("WlenInc"),&dValue, comment);
wLenInc = (float) dValue;
startPixelSub = (startWLenSub - wLenStart) / wLenInc;
for (i=0; i< meanSkyImage->xlen; i++)
for (j=0; j< meanSkyImage->ylen; j++)
if(i<startPixelSub-1) meanSkyImage->data[i+j*meanSkyImage->xlen] = 0.0;
*/
if(!interpolate) {
/* eventually interpolate in regions covered by the object in all
exposures that contains -32000 values even after the combination
FIXME - to be verified */
badObjects=0;
while(wSlit) {
object = wSlit->objs;
while(object) {
for(imaX=0; imaX<meanSkyImage->xlen; imaX++){
startFound = 0;
if(!imaX) {
for(j=wSlit->specStart; j<=wSlit->specEnd; j++){
/* check if a -32000 region exist */
if(meanSkyImage->data[imaX + j*meanSkyImage->xlen] == -32000 && !startFound) {
xStart=j-1;
startFound=1;
}
if(meanSkyImage->data[imaX + j*meanSkyImage->xlen] != -32000 && startFound) {
xEnd=j;
break;
}
}
if(startFound) badObjects++;
}
if(startFound) {
valStart = meanSkyImage->data[imaX + xStart*meanSkyImage->xlen];
valEnd = meanSkyImage->data[imaX + xEnd*meanSkyImage->xlen];
/* again simple linear interpolation */
m = (valEnd-valStart)/((float)(xEnd)-(float)(xStart));
for(imaY=xStart+1; imaY<xEnd; imaY++)
meanSkyImage->data[imaX + imaY*meanSkyImage->xlen] = m*(imaY-xStart) + valStart;
}
}
object=object->next;
}
wSlit=wSlit->next;
}
if(badObjects) cpl_msg_warning(task,"%d objects has been interpolated in central regions", badObjects);
}
/* finally subtract residual image from input images */
for (i = 0; i < mosCount; i++)
imageArithLocal(mosImages[i], meanSkyImage, VM_OPER_SUB);
/* cleaning */
for (j = 0; j < mosCount; j++)
deleteImage(subMosImages[j]);
pil_free(subMosImages);
return EXIT_SUCCESS;
}
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