analyse.c

/*
*				analyse.c
*
* Do measurements on detections.
*
*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
*
*	This file part of:	SExtractor
*
*	Copyright:		(C) 1993-2016 IAP/CNRS/UPMC
*
*	License:		GNU General Public License
*
*	SExtractor 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 3 of the License, or
*	(at your option) any later version.
*	SExtractor 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 SExtractor. If not, see <http://www.gnu.org/licenses/>.
*
*	Last modified:		16/11/2016
*
*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/

#ifdef HAVE_CONFIG_H
#include        "config.h"
#endif

#include	<math.h>
#include	<stdio.h>
#include	<stdlib.h>
#include	<string.h>

#include	"define.h"
#include	"key.h"
#include	"globals.h"
#include	"prefs.h"
#include	"fits/fitscat.h"
#include	"back.h"
#include	"dgeo.h"
#include	"check.h"
#include	"assoc.h"
#include	"astrom.h"
#include	"plist.h"
#include	"flag.h"
#include	"growth.h"
#include	"image.h"
#include	"photom.h"
#include	"psf.h"
#include	"profit.h"
#include	"retina.h"
#include	"som.h"
#include	"weight.h"
#include	"winpos.h"

static obj2struct	*obj2 = &outobj2;
extern profitstruct	*theprofit,*thedprofit;

/********************************* analyse ***********************************/
void  analyse(picstruct *field, picstruct *dfield, int objnb,
		objliststruct *objlist)

  {
   objstruct	*obj = objlist->obj+objnb;

/* Do photometry on the detection image if no other image available */
  obj->number = ++thecat.ndetect;
  obj->bkg = (float)back(field, (int)(obj->mx+0.5), (int)(obj->my+0.5));
  obj->dbkg = 0.0;
  if (prefs.pback_type == LOCAL)
    localback(field, obj);
  else
    obj->sigbkg = field->backsig;
  obj->dsigbkg = dfield? dfield->backsig : field->backsig;

  examineiso(field, dfield, obj, objlist->plist);

/*&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&*/
/* Put here your calls to custom functions related to isophotal measurements.
Ex:

compute_myparams(obj); 

*/

/*&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&*/


  return;
  }


/***************************** examineiso ********************************/
/*
compute some isophotal parameters IN THE MEASUREMENT image.
*/
void  examineiso(picstruct *field, picstruct *dfield, objstruct *obj,
		pliststruct *pixel)

  {
   checkstruct		*check;
   pliststruct		*pixt;
   int			i,j,k,h, photoflag,area,errflag, cleanflag,
			pospeakflag, minarea, gainflag;
   double		tv,sigtv, ngamma,
			esum, emx2,emy2,emxy, err,gain,backnoise2,dbacknoise2,
			xm,ym, x,y,var,var2, threshfac;
   float		*heap,*heapt,*heapj,*heapk, swap;
   PIXTYPE		pix, cdpix, tpix, peak,cdpeak, thresh,dthresh,minthresh;
   static PIXTYPE	threshs[NISO];


  if (!dfield)
    dfield = field;

/* Prepare computation of positional error */
  esum = emx2 = emy2 = emxy = 0.0;
  if ((errflag=FLAG(obj.poserr_mx2)))
    {
    dbacknoise2 = dfield->backsig*dfield->backsig;
    xm = obj->mx;
    ym = obj->my;
    }
  else
    xm = ym = dbacknoise2 = 0.0;	/* to avoid gcc -Wall warnings */

  pospeakflag = FLAG(obj.peakx);
  gain = field->gain;
  ngamma = field->ngamma;
  photoflag = (prefs.detect_type==PHOTO);
  gainflag = PLISTEXIST(var) && prefs.weightgain_flag;

  h = minarea = prefs.ext_minarea;

/* Prepare selection of the heap selection for CLEANing */
  if ((cleanflag = prefs.clean_flag))
    {
    if (obj->fdnpix < minarea)
      {
      obj->mthresh = 0.0;
      cleanflag = 0;
      heapt = heap = NULL;		/* to avoid gcc -Wall warnings */
      }
    else
      {
      QMALLOC(heap, float, minarea);
      heapt = heap;
      }
    }
  else
    {
    obj->mthresh = 0.0;
    heapt = heap = NULL;		/* to avoid gcc -Wall warnings */
    }


/* Measure essential isophotal parameters in the measurement image... */
  tv = sigtv = 0.0;
  var = backnoise2 = field->backsig*field->backsig;
  peak = -BIG;
  cdpeak = -BIG;
  thresh = field->thresh;
  minthresh = (PLISTEXIST(var))? BIG : thresh;
  threshfac = field->backsig > 0.0 ? field->thresh / field->backsig : 1.0;
  dthresh = dfield->dthresh;
  area = 0;
  for (pixt=pixel+obj->firstpix; pixt>=pixel; pixt=pixel+PLIST(pixt,nextpix))
    {
    pix = PLIST(pixt,value);
    if (pix>peak)
      peak = pix;

    cdpix=PLISTPIX(pixt,cdvalue);
    if (pospeakflag && cdpix>cdpeak)
      {
      cdpeak=cdpix;
      obj->peakx =  PLIST(pixt,x) + 1;
      obj->peaky =  PLIST(pixt,y) + 1;
      }
    if (PLISTEXIST(var))
      {
      var = PLISTPIX(pixt, var);
      thresh = threshfac*sqrt(var);
      if (thresh < minthresh)
        minthresh = thresh;
      }

    if (photoflag)
      {
      pix = exp(pix/ngamma);
      var2 = pix*pix*var;
      }
    else
      var2 = var;

    if (gainflag && pix>0.0 && gain>0.0)
      var2 += pix/gain*var/backnoise2;

    sigtv += var2;
    if (pix>thresh)
      area++;
    tv += pix;
    if (errflag)
      {
      err = dbacknoise2;
      if (gain>0.0 && cdpix>0.0)
        err += cdpix/gain;
      x = PLIST(pixt,x) - xm;
      y = PLIST(pixt,y) - ym;
      if PLISTEXIST(dgeo) {
        x -= PLISTPIX(pixt, dgeox);
        y -= PLISTPIX(pixt, dgeoy);
      }
      esum += err;
      emx2 += err*x*x;
      emy2 += err*y*y;
      emxy += err*x*y;
      }

/*-- Find the minareath pixel in decreasing intensity for CLEANing */
    if (cleanflag)
      {
      tpix = PLISTPIX(pixt, cdvalue) - (PLISTEXIST(dthresh)?
		PLISTPIX(pixt, dthresh):dthresh);
      if (h>0)
        *(heapt++) = (float)tpix;
      else if (h)
        {
        if ((float)tpix>*heap)
          {
          *heap = (float)tpix;
          for (j=0; (k=(j+1)<<1)<=minarea; j=k)
            {
            heapk = heap+k;
            heapj = heap+j;
            if (k != minarea && *(heapk-1) > *heapk)
              {
              heapk++;
              k++;
              }
            if (*heapj <= *(--heapk))
              break;
            swap = *heapk;
            *heapk = *heapj;
            *heapj = swap;
            }
          }
        }
      else
        fqmedian(heap, minarea);
      h--;
      }
    }

/* Flagging from the flag-map */
  if (PLISTEXIST(flag))
    getflags(obj, pixel);

/* Flag and count pixels with a low weight */
  if (PLISTEXIST(wflag))
    weight_count(obj, pixel);

  if (cleanflag)
    {
    obj->mthresh = *heap;
    free(heap);
    }

  if (errflag)
    {
     double	flux2;

    flux2 = obj->fdflux*obj->fdflux;
/*-- Estimation of the error ellipse moments: we re-use previous variables */
    emx2 /= flux2;	/* variance of xm */
    emy2 /= flux2;	/* variance of ym */
    emxy /= flux2;	/* covariance */

/*-- Handle fully correlated profile
s (which cause a singularity...) */
    esum *= 0.08333/flux2;
    if (obj->singuflag && (emx2*emy2-emxy*emxy) < esum*esum)
      {
      emx2 += esum;
      emy2 += esum;
      }

    obj->poserr_mx2 = emx2;
    obj->poserr_my2 = emy2;
    obj->poserr_mxy = emxy;
    }
 
  if (photoflag)
    {
    tv = ngamma*(tv-obj->fdnpix*exp(obj->dbkg/ngamma));
    sigtv /= ngamma*ngamma;
    }
  else
    {
    tv -= obj->fdnpix*obj->dbkg;
    if (!gainflag && gain > 0.0 && tv>0.0)
      sigtv += tv/gain;
    }

  obj->npix = area;
  obj->flux = tv;
  obj->fluxerr = sigtv;
  obj->peak = peak;
  obj->thresh = minthresh - obj->dbkg;
  obj->peak -= obj->dbkg;

/* Initialize isophotal thresholds so as to sample optimally the full profile*/

  if (FLAG(obj.iso[0]))
    {
     int	*iso;
     PIXTYPE	*thresht;

    memset(obj->iso, 0, NISO*sizeof(int));
    if (prefs.detect_type == PHOTO)
      for (i=0; i<NISO; i++)
        threshs[i] = obj->thresh + (obj->peak-obj->thresh)*i/NISO;
    else
      {
      if (obj->peak>0.0 && obj->thresh>0.0)
        for (i=0; i<NISO; i++)
          threshs[i] = obj->thresh*pow(obj->peak/obj->thresh, (double)i/NISO);
      else
        for (i=0; i<NISO; i++)
          threshs[i] = 0.0;
      }
    for (pixt=pixel+obj->firstpix; pixt>=pixel; pixt=pixel+PLIST(pixt,nextpix))
      for (i=NISO,iso=obj->iso,thresht=threshs;
		i-- && PLIST(pixt,value)>*(thresht++);)
        (*(iso++))++;
    }

/* Put objects in "segmentation check-image" */

  if ((check = prefs.check[CHECK_SEGMENTATION]))
    for (pixt=pixel+obj->firstpix; pixt>=pixel; pixt=pixel+PLIST(pixt,nextpix))
      ((ULONG *)check->pix)[check->width*PLIST(pixt,y)+PLIST(pixt,x)]
		= (ULONG)obj->number;

  if ((check = prefs.check[CHECK_OBJECTS]))
    for (pixt=pixel+obj->firstpix; pixt>=pixel; pixt=pixel+PLIST(pixt,nextpix))
      ((PIXTYPE *)check->pix)[check->width*PLIST(pixt,y)+PLIST(pixt,x)]
		= PLIST(pixt,value);

/* Compute the FWHM of the object */
  if (FLAG(obj.fwhm))
    {
     PIXTYPE	thresh0;

    thresh0 = obj->peak/5.0;
    if (thresh0<obj->thresh)
      thresh0 = obj->thresh;
    if (thresh0>0.0)
      {
       double	mx,my, s,sx,sy,sxx,sxy, dx,dy,d2, lpix,pix, b, inverr2, sat,
		dbkg, d, bmax;

      mx = obj->mx;
      my = obj->my;
      dbkg = obj->dbkg;
      sat = (double)(field->satur_level - obj->bkg);
      s = sx = sy = sxx = sxy = 0.0;
      for (pixt=pixel+obj->firstpix;pixt>=pixel;pixt=pixel+PLIST(pixt,nextpix))
        {
        pix = PLIST(pixt,value)-dbkg;
        if (pix>thresh0 && pix<sat)
          {
          dx = PLIST(pixt,x) - mx;
          dy = PLIST(pixt,y) - my;
          if PLISTEXIST(dgeo) {
            dx -= PLISTPIX(pixt, dgeox);
            dy -= PLISTPIX(pixt, dgeoy);
          }
          lpix = log(pix);
          inverr2 = pix*pix;
          s += inverr2;
          d2 = dx*dx+dy*dy;
          sx += d2*inverr2;
          sxx += d2*d2*inverr2;
          sy += lpix*inverr2;
          sxy += lpix*d2*inverr2;
          }        
        }
      d = s*sxx-sx*sx;
      if (fabs(d)>0.0)
        {
        b = -(s*sxy-sx*sy)/d;
        if (b<(bmax = 1/(13*obj->a*obj->b)))	/* to have FWHM # 6 sigma */
          b = bmax;
        obj->fwhm = (float)(1.6651/sqrt(b));
/*----- correction for undersampling effects (established from simulations) */
        if (obj->fwhm>0.0)
          obj->fwhm -= 1/(4*obj->fwhm);
        }
      else
        obj->fwhm = 0.0;
      }
    else
      obj->fwhm = 0.0;
    }

  return;
  }


/******************************* endobject **********************************/
/*
Final processing of object data, just before saving it to the catalog.
*/
void	endobject(picstruct *field, picstruct *dfield, picstruct *wfield,
		picstruct *dwfield, picstruct *dgeofield,
		int n, objliststruct *objlist)
  {
   objstruct		*obj;
   checkstruct		*check;
   double		rawpos[NAXIS],
			analtime1;
   int			i,j, ix,iy,selecflag, newnumber,nsub;

   if (prefs.psf_flag)
     thepsf->build_flag = 0;	/* Reset PSF building flag */
   if (prefs.dpsf_flag)
     thedpsf->build_flag = 0;	/* Reset PSF building flag */

  if (FLAG(obj2.analtime))
    analtime1 = counter_seconds();
  else
    analtime1 = 0.0;		/* To avoid gcc -Wall warnings */

  obj = &objlist->obj[n];

/* Current FITS extension */
  obj2->ext_number = thecat.currext;

/* Source position */
  obj2->sposx = (float)(obj2->posx = obj->mx+1.0); /* That's standard FITS */
  obj2->sposy = (float)(obj2->posy = obj->my+1.0);
  obj2->pos_dgeox = obj->dmx;
  obj2->pos_dgeoy = obj->dmy;

/* Integer coordinates */
  ix=(int)(obj->mx+0.49999);
  iy=(int)(obj->my+0.49999);

/* Association */
  if (prefs.assoc_flag)
    obj2->assoc_number = do_assoc(field, obj2->posx, obj2->posy);

  if (prefs.assoc_flag && prefs.assocselec_type!=ASSOCSELEC_ALL)
    selecflag = (prefs.assocselec_type==ASSOCSELEC_MATCHED)?
		obj2->assoc_number:!obj2->assoc_number;
  else
    selecflag = 1;

  if (selecflag)
    {
/*-- Paste back to the image the object's pixels if BLANKing is on */
    if (prefs.blank_flag)
      {
      pasteimage(field, obj->blank, obj->subw, obj->subh,
		obj->subx, obj->suby);
      if (obj->dblank)
        pasteimage(dfield, obj->dblank, obj->subw, obj->subh,
		obj->subx, obj->suby);
      }

/*------------------------- Error ellipse parameters ------------------------*/
    if (FLAG(obj2.poserr_a))
      {
       double	pmx2,pmy2,temp,theta;

      if (fabs(temp=obj->poserr_mx2-obj->poserr_my2) > 0.0)
        theta = atan2(2.0 * obj->poserr_mxy,temp) / 2.0;
      else
        theta = PI/4.0;

      temp = sqrt(0.25*temp*temp+obj->poserr_mxy*obj->poserr_mxy);
      pmy2 = pmx2 = 0.5*(obj->poserr_mx2+obj->poserr_my2);
      pmx2+=temp;
      pmy2-=temp;

      obj2->poserr_a = (float)sqrt(pmx2);
      obj2->poserr_b = (float)sqrt(pmy2);
      obj2->poserr_theta = theta*180.0/PI;
      }

    if (FLAG(obj2.poserr_cxx))
      {
       double	xm2,ym2, xym, temp;

      xm2 = obj->poserr_mx2;
      ym2 = obj->poserr_my2;
      xym = obj->poserr_mxy;
      obj2->poserr_cxx = (float)(ym2/(temp=xm2*ym2-xym*xym));
      obj2->poserr_cyy = (float)(xm2/temp);
      obj2->poserr_cxy = (float)(-2*xym/temp);
      }

/* ---- Aspect ratio */

    if (FLAG(obj2.elong))
      obj2->elong = obj->a/obj->b;

    if (FLAG(obj2.ellip))
      obj2->ellip = 1-obj->b/obj->a;

    if (FLAG(obj2.polar))
      obj2->polar = (obj->a*obj->a - obj->b*obj->b)
		/ (obj->a*obj->a + obj->b*obj->b);

/*-- Express positions in FOCAL or WORLD coordinates */
    if (FLAG(obj2.mxf) || FLAG(obj2.mxw))
      astrom_pos(field, obj);

    obj2->pixscale2 = 0.0;	/* To avoid gcc -Wall warnings */
    if (FLAG(obj2.mx2w)
	|| FLAG(obj2.win_mx2w)
	|| FLAG(obj2.poserr_mx2w)
	|| FLAG(obj2.winposerr_mx2w)
	|| FLAG(obj2.poserrmx2w_psf)
	|| FLAG(obj2.poserrmx2w_prof)
	|| FLAG(obj2.prof_flagw)
	|| ((!prefs.pixel_scale) && FLAG(obj2.area_flagw))
	|| ((!prefs.pixel_scale) && FLAG(obj2.fwhmw_psf)))
      {
      rawpos[0] = obj2->posx;
      rawpos[1] = obj2->posy;
      obj2->pixscale2 = wcs_jacobian(field->wcs, rawpos, obj2->jacob);
      }

/*-- Express shape parameters in the FOCAL or WORLD frame */
    if (FLAG(obj2.mx2w))
      astrom_shapeparam(field, obj);
/*-- Express position error parameters in the FOCAL or WORLD frame */
    if (FLAG(obj2.poserr_mx2w))
      astrom_errparam(field, obj);

    if (FLAG(obj2.npixw))
      obj2->npixw = obj->npix * (prefs.pixel_scale?
	field->pixscale/3600.0*field->pixscale/3600.0 : obj2->pixscale2);
    if (FLAG(obj2.fdnpixw))
      obj2->fdnpixw = obj->fdnpix * (prefs.pixel_scale?
	field->pixscale/3600.0*field->pixscale/3600.0 : obj2->pixscale2);

    if (FLAG(obj2.fwhmw))
      obj2->fwhmw = obj->fwhm * (prefs.pixel_scale?
	field->pixscale/3600.0 : sqrt(obj2->pixscale2));

/*------------------------------- Photometry -------------------------------*/

/*-- Convert the father of photom. error estimates from variance to RMS */
    obj2->flux_iso = obj->flux;
    obj2->fluxerr_iso = sqrt(obj->fluxerr);

    if (FLAG(obj2.flux_isocor))
      computeisocorflux(field, obj);

    if (FLAG(obj2.flux_aper))
      for (i=0; i<prefs.naper; i++)
        computeaperflux(field, wfield, obj, i);

    if (FLAG(obj2.flux_auto))
      computeautoflux(field, dfield, wfield, dwfield, obj);

    if (FLAG(obj2.flux_petro))
      computepetroflux(field, dfield, wfield, dwfield, obj);

/*-- Growth curve */
    if (prefs.growth_flag)
      makeavergrowth(field, wfield, obj);

/*--------------------------- Windowed barycenter --------------------------*/
    if (FLAG(obj2.winpos_x))
      {
      compute_winpos(field, wfield, dgeofield, obj);
/*---- Express positions in FOCAL or WORLD coordinates */
      if (FLAG(obj2.winpos_xf) || FLAG(obj2.winpos_xw))
        astrom_winpos(field, obj);
/*---- Express shape parameters in the FOCAL or WORLD frame */
      if (FLAG(obj2.win_mx2w))
        astrom_winshapeparam(field, obj);
/*---- Express position error parameters in the FOCAL or WORLD frame */
      if (FLAG(obj2.winposerr_mx2w))
        astrom_winerrparam(field, obj);
      }

/*---------------------------- Peak information ----------------------------*/
    if (obj->peak+obj->bkg >= field->satur_level)
      obj->flag |= OBJ_SATUR;
/*-- Express positions in FOCAL or WORLD coordinates */
    if (FLAG(obj2.peakxf) || FLAG(obj2.peakxw))
      astrom_peakpos(field, obj);

/*-- Check-image CHECK_APERTURES option */

    if ((check = prefs.check[CHECK_APERTURES]))
      {
      if (FLAG(obj2.flux_aper))
        for (i=0; i<prefs.naper; i++)
          sexcircle(check->pix, check->width, check->height,
		obj->mx, obj->my, prefs.apert[i]/2.0, check->overlay);

      if (FLAG(obj2.flux_auto))
        sexellips(check->pix, check->width, check->height,
	obj->mx, obj->my, obj->a*obj2->kronfactor,
	obj->b*obj2->kronfactor, obj->theta,
	check->overlay, obj->flag&OBJ_CROWDED);

      if (FLAG(obj2.flux_petro))
        sexellips(check->pix, check->width, check->height,
	obj->mx, obj->my, obj->a*obj2->petrofactor,
	obj->b*obj2->petrofactor, obj->theta,
	check->overlay, obj->flag&OBJ_CROWDED);
      }

/* ---------------------- Star/Galaxy classification -----------------------*/
    if (FLAG(obj2.fwhm_psf) || (FLAG(obj2.sprob) && prefs.seeing_fwhm==0.0))
      {
      obj2->fwhm_psf = (prefs.seeing_fwhm==0.0)?
				psf_fwhm(thepsf)*field->pixscale
				: prefs.seeing_fwhm;
      if (FLAG(obj2.fwhmw_psf))
        obj2->fwhmw_psf = obj2->fwhm_psf * (prefs.pixel_scale?
		field->pixscale/3600.0 : sqrt(obj2->pixscale2));
      }

    if (FLAG(obj2.sprob))
      {
       double	fac2, input[10], output, fwhm;

      fwhm = (prefs.seeing_fwhm==0.0)? obj2->fwhm_psf : prefs.seeing_fwhm;

      fac2 = fwhm/field->pixscale;
      fac2 *= fac2;
      input[j=0] = log10(obj->iso[0]? obj->iso[0]/fac2: 0.01);
      input[++j] = field->thresh>0.0?
		  log10(obj->peak>0.0? obj->peak/field->thresh: 0.1)
		 :-1.0;
      for (i=1; i<NISO; i++)
        input[++j] = log10(obj->iso[i]? obj->iso[i]/fac2: 0.01);
      input[++j] = log10(fwhm);
      neurresp(input, &output);
      obj2->sprob = (float)output;
      }

/*&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&*/
/*-- Put here your calls to "BLIND" custom functions. Ex:

    compute_myotherparams(obj); 

--*/

/*&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&*/

    newnumber = ++thecat.ntotal;
/*-- update segmentation map */
    if ((check=prefs.check[CHECK_SEGMENTATION]))
      {
       ULONG	*pix;
       ULONG	newsnumber = newnumber,
		oldsnumber = obj->number;
       int	dx,dx0,dy,dpix;

      pix = (ULONG *)check->pix + check->width*obj->ymin + obj->xmin;
      dx0 = obj->xmax-obj->xmin+1;
      dpix = check->width-dx0;
      for (dy=obj->ymax-obj->ymin+1; dy--; pix += dpix)
        for (dx=dx0; dx--; pix++)
          if (*pix==oldsnumber)
            *pix = newsnumber;
      }
    obj->number = newnumber;

/*-- SOM fitting */
    if (prefs.somfit_flag)
      {
       float    *input;

      input = thesom->input;
      copyimage(field,input,thesom->inputsize[0],thesom->inputsize[1],ix,iy);

      if (thesom->nextrainput)
        {
        input += thesom->ninput-thesom->nextrainput;
        *(input) = (obj->mx+1)/field->width;
        *(input+1) = (obj->my+1)/field->height;
        }

      som_phot(thesom, obj->bkg, field->backsig,
        (float)field->gain, obj->mx-ix, obj->my-iy,
        FLAG(obj2.vector_somfit)?outobj2.vector_somfit:NULL, -1.0);
      obj2->stderr_somfit = thesom->stderror;
      obj2->flux_somfit = thesom->amp;
      outobj2.fluxerr_somfit = thesom->sigamp;
      }

    if (FLAG(obj2.vignet))
      copyimage(field,outobj2.vignet,prefs.vignetsize[0],prefs.vignetsize[1],
	ix,iy);

    if (FLAG(obj2.vigshift))
      copyimage_center(field, outobj2.vigshift, prefs.vigshiftsize[0],
		prefs.vigshiftsize[1], obj->mx, obj->my);

    if (dgeofield) {
      if (FLAG(obj2.vignet_dgeox) && FLAG(obj2.vignet_dgeoy)
	&& prefs.vignet_dgeoxsize[0] == prefs.vignet_dgeoysize[0]
	&& prefs.vignet_dgeoxsize[1] == prefs.vignet_dgeoysize[1])
        dgeo_copy(dgeofield, outobj2.vignet_dgeox , outobj2.vignet_dgeoy,
		prefs.vignet_dgeoxsize[0],prefs.vignet_dgeoxsize[1], ix,iy);
      else {
        if (FLAG(obj2.vignet_dgeox)) 
          dgeo_copy(dgeofield, outobj2.vignet_dgeox, NULL,
		prefs.vignet_dgeoxsize[0],prefs.vignet_dgeoxsize[1], ix,iy);
        if (FLAG(obj2.vignet_dgeoy)) 
          dgeo_copy(dgeofield, NULL, outobj2.vignet_dgeoy,
		prefs.vignet_dgeoysize[0],prefs.vignet_dgeoysize[1], ix,iy);
      }
    }

/*----- Pre-compute mags in case they are needed for PSF dependency */
    if (prefs.psffit_flag || prefs.prof_flag)
      computemags(field, obj);

/*------------------------------- PSF fitting ------------------------------*/

    nsub = 1;
    if (prefs.psffit_flag)
      {
      if (prefs.dpsffit_flag)
        double_psf_fit(thepsf, field, wfield, obj, thedpsf, dfield, dwfield);
      else
        psf_fit(thepsf, field, wfield, obj);
      obj2->npsf = thepsfit->npsf;
      nsub = thepsfit->npsf;
      if (nsub<1)
        nsub = 1;
      }

/*----------------------------- Profile fitting -----------------------------*/
#ifdef USE_MODEL
    if (prefs.prof_flag)
      {
      profit_fit(theprofit, field, wfield, dgeofield, obj, obj2);
/*---- Express positions in FOCAL or WORLD coordinates */
      if (FLAG(obj2.xf_prof) || FLAG(obj2.xw_prof))
        astrom_profpos(field, obj);
/*---- Express shape parameters in the FOCAL or WORLD frame */
      if (FLAG(obj2.prof_flagw))
        astrom_profshapeparam(field, obj);
/*---- Express position error parameters in the FOCAL or WORLD frame */
      if (FLAG(obj2.poserrmx2w_prof))
        astrom_proferrparam(field, obj);
      if (prefs.dprof_flag)
        profit_dfit(theprofit, thedprofit, field, dfield, wfield, dwfield, obj,
		obj2);
      }
#endif
/*--- Express everything in magnitude units */
    computemags(field, obj);

/*-------------------------------- Astrometry ------------------------------*/

/*-- Edit min and max coordinates to follow the FITS conventions */
    obj->xmin += 1;
    obj->ymin += 1;
    obj->xmax += 1;
    obj->ymax += 1;

/*-- Go through each newly identified component */
    for (j=0; j<nsub; j++)
      {
      if (prefs.psffit_flag)
        {
        obj2->x_psf = thepsfit->x[j];
        obj2->y_psf = thepsfit->y[j];
        if (FLAG(obj2.xf_psf) || FLAG(obj2.xw_psf))
          astrom_psfpos(field, obj);
/*------ Express position error parameters in the FOCAL or WORLD frame */
        if (FLAG(obj2.poserrmx2w_psf))
          astrom_psferrparam(field, obj);
        if (FLAG(obj2.flux_psf))
          obj2->flux_psf = thepsfit->flux[j]>0.0? thepsfit->flux[j]:0.0; /*?*/
        if (FLAG(obj2.mag_psf))
          obj2->mag_psf = thepsfit->flux[j]>0.0?
		prefs.mag_zeropoint -2.5*log10(thepsfit->flux[j]) : 99.0;
        if (FLAG(obj2.fluxerr_psf))
          obj2->fluxerr_psf= thepsfit->fluxerr[j];
        if (FLAG(obj2.magerr_psf))
          obj2->magerr_psf =
		(thepsfit->flux[j]>0.0 && thepsfit->fluxerr[j]>0.0) ? /*?*/
			1.086*thepsfit->fluxerr[j]/thepsfit->flux[j] : 99.0;
        if (j)
          obj->number = ++thecat.ntotal;
        }

      if (FLAG(obj2.analtime) && !j)
        obj2->analtime = (float)(counter_seconds() - analtime1);

      FPRINTF(OUTPUT, "%8d %6.1f %6.1f %5.1f %5.1f %12g "
			"%c%c%c%c%c%c%c%c\n",
	obj->number, obj->mx+1.0, obj->my+1.0,
	obj->a, obj->b,
	obj->flux,
	obj->flag&OBJ_CROWDED?'C':'_',
	obj->flag&OBJ_MERGED?'M':'_',
	obj->flag&OBJ_SATUR?'S':'_',
	obj->flag&OBJ_TRUNC?'T':'_',
	obj->flag&OBJ_APERT_PB?'A':'_',
	obj->flag&OBJ_ISO_PB?'I':'_',
	obj->flag&OBJ_DOVERFLOW?'D':'_',
	obj->flag&OBJ_OVERFLOW?'O':'_');
      writecat(n, objlist);
      }
    }
  else
    {
/*-- Treatment of discarded detections */
/*-- update segmentation map */
    if ((check=prefs.check[CHECK_SEGMENTATION]))
      {
       ULONG	*pix;
       ULONG	oldsnumber = obj->number;
       int	dx,dx0,dy,dpix;

      pix = (ULONG *)check->pix + check->width*obj->ymin + obj->xmin;
      dx0 = obj->xmax-obj->xmin+1;
      dpix = check->width-dx0;
      for (dy=obj->ymax-obj->ymin+1; dy--; pix += dpix)
        for (dx=dx0; dx--; pix++)
          if (*pix==oldsnumber)
            *pix = 0;
      }
    }

/* Remove again from the image the object's pixels if BLANKing is on ... */
/*-- ... and free memory */

  if (prefs.blank_flag && obj->blank)
    {
    if (selecflag)
      {
      if (prefs.somfit_flag && (check=prefs.check[CHECK_MAPSOM]))
        blankcheck(check, obj->blank, obj->subw, obj->subh,
		obj->subx, obj->suby, (PIXTYPE)*(obj2->vector_somfit));

      }
    blankimage(field, obj->blank, obj->subw, obj->subh,
		obj->subx, obj->suby, -BIG);
    free(obj->blank);
    if (obj->dblank)
      {
      blankimage(dfield, obj->dblank, obj->subw, obj->subh,
		obj->subx, obj->suby, -BIG);
      free(obj->dblank);
      }
    }

  /* Clean (zero) all measurements */
  zerocat();

  return;
  }