/******************************** preanalyse *********************************
PROTO void preanalyse(int no, objliststruct *objlist, int analyse_type)
PURPOSE Compute basic image parameters from the pixel-list for each detection.
INPUT objlist number,
objlist pointer,
analysis switch flag.
OUTPUT -.
NOTES -.
AUTHOR E. Bertin (IAP & Leiden & ESO)
VERSION 28/11/2003
***/
void preanalyse(int no, objliststruct *objlist, int analyse_type)
{
objstruct *obj = &objlist->obj[no];
pliststruct *pixel = objlist->plist, *pixt;
PIXTYPE peak, cpeak, val, cval, minthresh, thresht;
double thresh,thresh2, t1t2,darea,
mx,my, mx2,my2,mxy, rv, tv,
xm,ym, xm2,ym2,xym,
temp,temp2, theta,pmx2,pmy2;
int x, y, xmin,xmax, ymin,ymax,area2, fdnpix, dnpix;
/*----- initialize stacks and bounds */
thresh = obj->dthresh;
if (PLISTEXIST(dthresh))
minthresh = BIG;
else
minthresh = 0.0;
fdnpix = dnpix = 0;
rv = 0.0;
peak = cpeak = -BIG;
ymin = xmin = 2*MAXPICSIZE; /* to be really sure!! */
ymax = xmax = 0;
/*----- integrate results */
for (pixt=pixel+obj->firstpix; pixt>=pixel; pixt=pixel+PLIST(pixt,nextpix))
{
x = PLIST(pixt, x);
y = PLIST(pixt, y);
val=PLISTPIX(pixt, dvalue);
if (cpeak < (cval=PLISTPIX(pixt, cdvalue)))
cpeak = cval;
if (PLISTEXIST(dthresh) && (thresht=PLISTPIX(pixt, dthresh))<minthresh)
minthresh = thresht;
if (peak < val)
peak = val;
rv += cval;
if (xmin > x)
xmin = x;
if (xmax < x)
xmax = x;
if (ymin > y)
ymin = y;
if (ymax < y)
ymax = y;
fdnpix++;
}
if (PLISTEXIST(dthresh))
obj->dthresh = thresh = minthresh;
/* copy some data to "obj" structure */
obj->fdnpix = (LONG)fdnpix;
obj->fdflux = (float)rv;
obj->fdpeak = cpeak;
obj->dpeak = peak;
obj->xmin = xmin;
obj->xmax = xmax;
obj->ymin = ymin;
obj->ymax = ymax;
if (analyse_type & ANALYSE_FULL)
{
mx = my = tv = 0.0;
mx2 = my2 = mxy = 0.0;
thresh2 = (thresh + peak)/2.0;
area2 = 0;
for (pixt=pixel+obj->firstpix; pixt>=pixel; pixt=pixel+PLIST(pixt,nextpix))
{
x = PLIST(pixt,x)-xmin; /* avoid roundoff errors on big images */
y = PLIST(pixt,y)-ymin; /* avoid roundoff errors on big images */
cval = PLISTPIX(pixt, cdvalue);
tv += (val = PLISTPIX(pixt, dvalue));
if (val>thresh)
dnpix++;
if (val > thresh2)
area2++;
mx += cval * x;
my += cval * y;
mx2 += cval * x*x;
my2 += cval * y*y;
mxy += cval * x*y;
}
/*----- compute object's properties */
xm = mx / rv; /* mean x */
ym = my / rv; /* mean y */
/*-- In case of blending, use previous barycenters */
if ((analyse_type&ANALYSE_ROBUST) && (obj->flag&OBJ_MERGED))
{
double xn,yn;
xn = obj->mx-xmin;
yn = obj->my-ymin;
xm2 = mx2 / rv + xn*xn - 2*xm*xn;
ym2 = my2 / rv + yn*yn - 2*ym*yn;
xym = mxy / rv + xn*yn - xm*yn - xn*ym;
xm = xn;
ym = yn;
}
else
{
xm2 = mx2 / rv - xm * xm; /* variance of x */
ym2 = my2 / rv - ym * ym; /* variance of y */
xym = mxy / rv - xm * ym; /* covariance */
}
/* Handle fully correlated x/y (which cause a singularity...) */
if ((temp2=xm2*ym2-xym*xym)<0.00694)
{
xm2 += 0.0833333;
ym2 += 0.0833333;
temp2 = xm2*ym2-xym*xym;
obj->singuflag = 1;
}
else
obj->singuflag = 0;
if ((fabs(temp=xm2-ym2)) > 0.0)
theta = atan2(2.0 * xym,temp) / 2.0;
else
theta = PI/4.0;
temp = sqrt(0.25*temp*temp+xym*xym);
pmy2 = pmx2 = 0.5*(xm2+ym2);
pmx2+=temp;
pmy2-=temp;
obj->dnpix = (obj->flag & OBJ_OVERFLOW)? obj->fdnpix:(LONG)dnpix;
obj->dflux = tv;
obj->mx = xm+xmin; /* add back xmin */
obj->my = ym+ymin; /* add back ymin */
obj->mx2 = xm2;
obj->my2 = ym2;
obj->mxy = xym;
obj->a = (float)sqrt(pmx2);
obj->b = (float)sqrt(pmy2);
obj->theta = theta*180.0/PI;
obj->cxx = (float)(ym2/temp2);
obj->cyy = (float)(xm2/temp2);
obj->cxy = (float)(-2*xym/temp2);
darea = (double)area2 - dnpix;
t1t2 = thresh/thresh2;
if (t1t2>0.0 && !prefs.dweight_flag)
{
obj->abcor = (darea<0.0?darea:-1.0)/(2*PI*log(t1t2<1.0?t1t2:0.99)
*obj->a*obj->b);
if (obj->abcor>1.0)
obj->abcor = 1.0;
}
else
obj->abcor = 1.0;
}
return;
}
/****************************** scanimage ************************************
PROTO void scanimage(picstruct *field, picstruct *dfield, picstruct *ffield,
picstruct *wfield, picstruct *dwfield)
PURPOSE Scan of the large pixmap(s). Main loop and heart of the program.
INPUT Measurement field pointer,
Detection field pointer,
Flag field pointer,
Measurement weight-map field pointer,
Detection weight-map field pointer,
OUTPUT -.
NOTES -.
AUTHOR E. Bertin (IAP)
VERSION 21/12/2011
***/
void scanimage(picstruct *field, picstruct *dfield, picstruct **pffield,
int nffield, picstruct *wfield, picstruct *dwfield)
{
static infostruct curpixinfo, *info, *store,
initinfo, freeinfo, *victim;
picstruct *ffield;
checkstruct *check;
objliststruct objlist;
objstruct *cleanobj;
pliststruct *pixel, *pixt;
picstruct *cfield, *cdwfield;
char *marker, newmarker, *blankpad, *bpt,*bpt0;
int co, i,j, flag, luflag,pstop, xl,xl2,yl, cn,
nposize, stacksize, w, h, blankh, maxpixnb,
varthreshflag, ontotal;
short trunflag;
PIXTYPE thresh, relthresh, cdnewsymbol, cdwthresh,wthresh,
*scan,*dscan,*cdscan,*dwscan,*dwscanp,*dwscann,
*cdwscan,*cdwscanp,*cdwscann,*wscand,
*scant, *wscan,*wscann,*wscanp;
FLAGTYPE *pfscan[MAXFLAG];
status cs, ps, *psstack;
int *start, *end, ymax;
/* Avoid gcc -Wall warnings */
scan = dscan = cdscan = cdwscan = cdwscann = cdwscanp
= dwscan = dwscann = dwscanp
= wscan = wscann = wscanp = NULL;
victim = NULL; /* Avoid gcc -Wall warnings */
blankh = 0; /* Avoid gcc -Wall warnings */
/*----- Beginning of the main loop: Initialisations */
thecat.ntotal = thecat.ndetect = 0;
/* cfield is the detection field in any case */
cfield = dfield? dfield:field;
/* cdwfield is the detection weight-field if available */
cdwfield = dwfield? dwfield:(prefs.dweight_flag?wfield:NULL);
cdwthresh = cdwfield ? cdwfield->weight_thresh : 0.0;
if (cdwthresh>BIG*WTHRESH_CONVFAC);
cdwthresh = BIG*WTHRESH_CONVFAC;
wthresh = wfield? wfield->weight_thresh : 0.0;
/* If WEIGHTing and no absolute thresholding, activate threshold scaling */
varthreshflag = (cdwfield && prefs.thresh_type[0]!=THRESH_ABSOLUTE);
relthresh = varthreshflag ? prefs.dthresh[0] : 0.0;/* To avoid gcc warnings*/
w = cfield->width;
h = cfield->height;
objlist.dthresh = cfield->dthresh;
objlist.thresh = field->thresh;
cfield->yblank = 1;
field->y = field->stripy = 0;
field->ymin = field->stripylim = 0;
field->stripysclim = 0;
if (dfield)
{
dfield->y = dfield->stripy = 0;
dfield->ymin = dfield->stripylim = 0;
dfield->stripysclim = 0;
}
if (nffield)
for (i=0; i<nffield; i++)
{
ffield = pffield[i];
ffield->y = ffield->stripy = 0;
ffield->ymin = ffield->stripylim = 0;
ffield->stripysclim = 0;
}
if (wfield)
{
wfield->y = wfield->stripy = 0;
wfield->ymin = wfield->stripylim = 0;
wfield->stripysclim = 0;
}
if (dwfield)
{
dwfield->y = dwfield->stripy = 0;
dwfield->ymin = dwfield->stripylim = 0;
dwfield->stripysclim = 0;
}
/*Allocate memory for buffers */
stacksize = w+1;
QMALLOC(info, infostruct, stacksize);
QCALLOC(store, infostruct, stacksize);
QMALLOC(marker, char, stacksize);
QMALLOC(dumscan, PIXTYPE, stacksize);
QMALLOC(psstack, status, stacksize);
QCALLOC(start, int, stacksize);
QMALLOC(end, int, stacksize);
blankpad = bpt = NULL;
lutzalloc(w,h);
allocparcelout();
/* Some initializations */
thresh = objlist.dthresh;
initinfo.pixnb = 0;
initinfo.flag = 0;
initinfo.firstpix = initinfo.lastpix = -1;
for (xl=0; xl<stacksize; xl++)
{
marker[xl] = 0 ;
dumscan[xl] = -BIG ;
}
co = pstop = 0;
objlist.nobj = 1;
curpixinfo.pixnb = 1;
/* Init cleaning procedure */
initclean();
/*----- Allocate memory for the pixel list */
init_plist();
if (!(pixel = objlist.plist = malloc(nposize=prefs.mem_pixstack*plistsize)))
error(EXIT_FAILURE, "Not enough memory to store the pixel stack:\n",
" Try to decrease MEMORY_PIXSTACK");
/*----- at the beginning, "free" object fills the whole pixel list */
freeinfo.firstpix = 0;
freeinfo.lastpix = nposize-plistsize;
pixt = pixel;
for (i=plistsize; i<nposize; i += plistsize, pixt += plistsize)
PLIST(pixt, nextpix) = i;
PLIST(pixt, nextpix) = -1;
/* Allocate memory for other buffers */
if (prefs.filter_flag)
{
QMALLOC(cdscan, PIXTYPE, stacksize);
if (cdwfield)
{
QCALLOC(cdwscan, PIXTYPE, stacksize);
if (PLISTEXIST(wflag))
{
QCALLOC(cdwscanp, PIXTYPE, stacksize);
QCALLOC(cdwscann, PIXTYPE, stacksize);
}
}
/*-- One needs a buffer to protect filtering if source-blanking applies */
if (prefs.blank_flag)
{
blankh = thefilter->convh/2+1;
QMALLOC(blankpad, char, w*blankh);
cfield->yblank -= blankh;
if (dfield)
field->yblank = cfield->yblank;
bpt = blankpad;
}
}
/*----- Here we go */
for (yl=0; yl<=h;)
{
ps = COMPLETE;
cs = NONOBJECT;
if (yl==h)
{
/*---- Need an empty line for Lutz' algorithm to end gracely */
if (prefs.filter_flag)
{
free(cdscan);
if (cdwfield)
{
if (PLISTEXIST(wflag))
{
free(cdwscanp);
free(cdwscann);
cdwscanp = cdwscan;
}
else
free(cdwscan);
}
}
cdwscan = cdwscann = cdscan = dumscan;
}
else
{
if (nffield)
for (i=0; i<nffield; i++)
{
ffield = pffield[i];
pfscan[i] = (ffield->stripy==ffield->stripysclim)?
(FLAGTYPE *)loadstrip(ffield, (picstruct *)NULL)
: &ffield->fstrip[ffield->stripy*ffield->width];
}
if (wfield)
{
/*------ Copy the previous weight line to track bad pixel limits */
wscan = (wfield->stripy==wfield->stripysclim)?
(PIXTYPE *)loadstrip(wfield, (picstruct *)NULL)
: &wfield->strip[wfield->stripy*wfield->width];
if (PLISTEXIST(wflag))
{
if (yl>0)
wscanp = &wfield->strip[((yl-1)%wfield->stripheight)*wfield->width];
if (yl<h-1)
wscann = &wfield->strip[((yl+1)%wfield->stripheight)*wfield->width];
}
}
scan = (field->stripy==field->stripysclim)?
(PIXTYPE *)loadstrip(field, wfield)
: &field->strip[field->stripy*field->width];
if (dwfield)
{
dwscan = (dwfield->stripy==dwfield->stripysclim)?
(PIXTYPE *)loadstrip(dwfield,
dfield?(picstruct *)NULL:dwfield)
: &dwfield->strip[dwfield->stripy*dwfield->width];
if (PLISTEXIST(wflag))
{
if (yl>0)
dwscanp = &dwfield->strip[((yl-1)%dwfield->stripheight)
*dwfield->width];
if (yl<h-1)
dwscann = &dwfield->strip[((yl+1)%dwfield->stripheight)
*dwfield->width];
}
}
else
{
dwscan = wscan;
if (PLISTEXIST(wflag))
{
dwscanp = wscanp;
dwscann = wscann;
}
}
if (dfield)
dscan = (dfield->stripy==dfield->stripysclim)?
(PIXTYPE *)loadstrip(dfield, dwfield)
: &dfield->strip[dfield->stripy*dfield->width];
else
dscan = scan;
if (prefs.filter_flag)
{
filter(cfield, cdscan, cfield->y);
if (cdwfield)
{
if (PLISTEXIST(wflag))
{
if (yl==0)
filter(cdwfield, cdwscann, yl);
wscand = cdwscanp;
cdwscanp = cdwscan;
cdwscan = cdwscann;
cdwscann = wscand;
if (yl < h-1)
filter(cdwfield, cdwscann, yl + 1);
}
else
filter(cdwfield, cdwscan, yl);
}
}
else
{
cdscan = dscan;
cdwscan = dwscan;
if (PLISTEXIST(wflag))
{
cdwscanp = dwscanp;
cdwscann = dwscann;
}
}
if ((check=prefs.check[CHECK_FILTERED]))
writecheck(check, cdscan, w);
}
trunflag = (yl==0 || yl==h-1)? OBJ_TRUNC:0;
for (xl=0; xl<=w; xl++)
{
if (xl == w)
cdnewsymbol = -BIG;
else
cdnewsymbol = cdscan[xl];
newmarker = marker[xl];
marker[xl] = 0;
curpixinfo.flag = trunflag;
if (varthreshflag)
thresh = relthresh*sqrt((xl==w || yl==h)? 0.0:cdwscan[xl]);
luflag = cdnewsymbol > thresh?1:0;
if (luflag)
{
if (xl==0 || xl==w-1)
curpixinfo.flag |= OBJ_TRUNC;
pixt = pixel + (cn=freeinfo.firstpix);
freeinfo.firstpix = PLIST(pixt, nextpix);
/*------- Running out of pixels, the largest object becomes a "victim" ------*/
if (freeinfo.firstpix==freeinfo.lastpix)
{
sprintf(gstr, "%d,%d", xl+1, yl+1);
warning("Pixel stack overflow at position ", gstr);
maxpixnb = 0;
for (i=0; i<=w; i++)
if (store[i].pixnb>maxpixnb)
if (marker[i]=='S' || (newmarker=='S' && i==xl))
{
flag = 0;
if (i<xl)
for (j=0; j<=co; j++)
flag |= (start[j]==i);
if (!flag)
maxpixnb = (victim = &store[i])->pixnb;
}
for (j=1; j<=co; j++)
if (info[j].pixnb>maxpixnb)
maxpixnb = (victim = &info[j])->pixnb;
if (!maxpixnb)
error(EXIT_FAILURE, "*Fatal Error*: something is badly bugged in ",
"scanimage()!");
if (maxpixnb <= 1)
error(EXIT_FAILURE, "Pixel stack overflow in ", "scanimage()");
freeinfo.firstpix = PLIST(pixel+victim->firstpix, nextpix);
PLIST(pixel+victim->lastpix, nextpix) = freeinfo.lastpix;
PLIST(pixel+(victim->lastpix=victim->firstpix), nextpix) = -1;
victim->pixnb = 1;
victim->flag |= OBJ_OVERFLOW;
}
/*---------------------------------------------------------------------------*/
curpixinfo.lastpix = curpixinfo.firstpix = cn;
PLIST(pixt, nextpix) = -1;
PLIST(pixt, x) = xl;
PLIST(pixt, y) = yl;
PLIST(pixt, value) = scan[xl];
if (PLISTEXIST(dvalue))
PLISTPIX(pixt, dvalue) = dscan[xl];
if (PLISTEXIST(cdvalue))
PLISTPIX(pixt, cdvalue) = cdnewsymbol;
if (PLISTEXIST(flag))
for (i=0; i<nffield; i++)
PLISTFLAG(pixt, flag[i]) = pfscan[i][xl];
/*--------------------- Detect pixels with a low weight ---------------------*/
if (PLISTEXIST(wflag) && wscan)
{
PLISTFLAG(pixt, wflag) = 0;
if (wscan[xl] >= wthresh)
PLISTFLAG(pixt, wflag) |= OBJ_LOWWEIGHT;
if (cdwscan[xl] >= cdwthresh)
PLISTFLAG(pixt, wflag) |= OBJ_LOWDWEIGHT;
if (yl>0)
{
if (cdwscanp[xl] >= cdwthresh)
PLISTFLAG(pixt, wflag) |= OBJ_LOWDWEIGHT;
if (xl>0 && cdwscanp[xl-1]>=cdwthresh)
PLISTFLAG(pixt, wflag) |= OBJ_LOWDWEIGHT;
if (xl<w-1 && cdwscanp[xl+1]>=cdwthresh)
PLISTFLAG(pixt, wflag) |= OBJ_LOWDWEIGHT;
}
if (xl>0 && cdwscan[xl-1]>=cdwthresh)
PLISTFLAG(pixt, wflag) |= OBJ_LOWDWEIGHT;
if (xl<w-1 && cdwscan[xl+1]>=cdwthresh)
PLISTFLAG(pixt, wflag) |= OBJ_LOWDWEIGHT;
if (yl<h-1)
{
if (cdwscann[xl] >= cdwthresh)
PLISTFLAG(pixt, wflag) |= OBJ_LOWDWEIGHT;
if (xl>0 && cdwscann[xl-1]>=cdwthresh)
PLISTFLAG(pixt, wflag) |= OBJ_LOWDWEIGHT;
if (xl<w-1 && cdwscann[xl+1]>=cdwthresh)
PLISTFLAG(pixt, wflag) |= OBJ_LOWDWEIGHT;
}
}
if (PLISTEXIST(dthresh))
PLISTPIX(pixt, dthresh) = thresh;
if (PLISTEXIST(var))
PLISTPIX(pixt, var) = wscan[xl];
if (cs != OBJECT)
/*------------------------------- Start Segment -----------------------------*/
{
cs = OBJECT;
if (ps == OBJECT)
{
if (start[co] == UNKNOWN)
{
marker[xl] = 'S';
start[co] = xl;
}
else
marker[xl] = 's';
}
else
{
psstack[pstop++] = ps;
marker[xl] = 'S';
start[++co] = xl;
ps = COMPLETE;
info[co] = initinfo;
}
}
/*---------------------------------------------------------------------------*/
}
if (newmarker)
/*---------------------------- Process New Marker ---------------------------*/
{
if (newmarker == 'S')
{
psstack[pstop++] = ps;
if (cs == NONOBJECT)
{
psstack[pstop++] = COMPLETE;
info[++co] = store[xl];
start[co] = UNKNOWN;
}
else
update (&info[co],&store[xl], pixel);
ps = OBJECT;
}
else if (newmarker == 's')
{
if ((cs == OBJECT) && (ps == COMPLETE))
{
pstop--;
xl2 = start[co];
update (&info[co-1],&info[co], pixel);
if (start[--co] == UNKNOWN)
start[co] = xl2;
else
marker[xl2] = 's';
}
ps = OBJECT;
}
else if (newmarker == 'f')
ps = INCOMPLETE;
else if (newmarker == 'F')
{
ps = psstack[--pstop];
if ((cs == NONOBJECT) && (ps == COMPLETE))
{
if (start[co] == UNKNOWN)
{
if ((int)info[co].pixnb >= prefs.ext_minarea)
{
sortit(field, dfield, wfield, cdwfield, &info[co], &objlist,
cdwscan, wscan);
}
/* ------------------------------------ free the chain-list */
PLIST(pixel+info[co].lastpix, nextpix) = freeinfo.firstpix;
freeinfo.firstpix = info[co].firstpix;
}
else
{
marker[end[co]] = 'F';
store[start[co]] = info[co];
}
co--;
ps = psstack[--pstop];
}
}
}
/*---------------------------------------------------------------------------*/
if (luflag)
update (&info[co],&curpixinfo, pixel);
else
{
if (cs == OBJECT)
/*-------------------------------- End Segment ------------------------------*/
{
cs = NONOBJECT;
if (ps != COMPLETE)
{
marker[xl] = 'f';
end[co] = xl;
}
else
{
ps = psstack[--pstop];
marker[xl] = 'F';
store[start[co]] = info[co];
co--;
}
}
}
if (prefs.blank_flag && xl<w)
{
if (prefs.filter_flag)
*(bpt++) = (luflag)?1:0;
else if (luflag)
dscan[xl] = -BIG;
if (dfield && luflag)
scan[xl] = -BIG;
}
/*--------------------- End of the loop over the x's -----------------------*/
}
/* Detected pixel removal at the end of each line */
if (prefs.blank_flag && yl<h)
{
if (prefs.filter_flag)
{
bpt = bpt0 = blankpad + w*((yl+1)%blankh);
if (cfield->yblank >= 0)
{
scant = &PIX(cfield, 0, cfield->yblank);
for (i=w; i--; scant++)
if (*(bpt++))
*scant = -BIG;
if (dfield)
{
bpt = bpt0;
scant = &PIX(field, 0, cfield->yblank);
for (i=w; i--; scant++)
if (*(bpt++))
*scant = -BIG;
}
bpt = bpt0;
}
}
cfield->yblank++;
if (dfield)
field->yblank = cfield->yblank;
}
/*-- Prepare markers for the next line */
yl++;
field->stripy = (field->y=yl)%field->stripheight;
if (dfield)
dfield->stripy = (dfield->y=yl)%dfield->stripheight;
if (nffield)
for (i=0; i<nffield; i++)
{
ffield = pffield[i];
ffield->stripy = (ffield->y=yl)%ffield->stripheight;
}
if (wfield)
wfield->stripy = (wfield->y=yl)%wfield->stripheight;
if (dwfield)
dwfield->stripy = (dwfield->y=yl)%dwfield->stripheight;
/*-- Remove objects close to the ymin limit if ymin is ready to increase */
if (cfield->stripy==cfield->stripysclim)
{
cleanobj = cleanobjlist->obj+cleanobjlist->nobj-1;
ontotal = 0;
for (i=cleanobjlist->nobj; i--; cleanobj--)
{
if (cleanobj->ycmin <= cfield->ymin)
{
/*-------- Warn if there is a possibility for any aperture to be truncated */
if ((ymax=cleanobj->ycmax) > cfield->ymax)
{
sprintf(gstr, "Object at position %.0f,%.0f ",
cleanobj->mx+1, cleanobj->my+1);
QWARNING(gstr, "may have some apertures truncated:\n"
" You might want to increase MEMORY_BUFSIZE");
}
else if (ymax>cfield->yblank && prefs.blank_flag)
{
sprintf(gstr, "Object at position %.0f,%.0f ",
cleanobj->mx+1, cleanobj->my+1);
QWARNING(gstr, "may have some unBLANKed neighbours:\n"
" You might want to increase MEMORY_PIXSTACK");
}
if ((prefs.prof_flag && !(thecat.ntotal%10)
&& thecat.ntotal != ontotal)
|| !(thecat.ntotal%400))
NPRINTF(OUTPUT, "\33[1M> Line:%5d "
"Objects: %8d detected / %8d sextracted\n\33[1A",
yl>h? h:yl, thecat.ndetect, thecat.ntotal);
ontotal = thecat.ntotal;
endobject(field, dfield, wfield, cdwfield, i, cleanobjlist);
subcleanobj(i);
cleanobj = cleanobjlist->obj+i; /* realloc in subcleanobj() */
}
}
}
if ((prefs.prof_flag && !(thecat.ntotal%10)) || !(yl%25))
NPRINTF(OUTPUT, "\33[1M> Line:%5d "
"Objects: %8d detected / %8d sextracted\n\33[1A",
yl>h?h:yl, thecat.ndetect, thecat.ntotal);
/*--------------------- End of the loop over the y's -----------------------*/
}
/* Removal or the remaining pixels */
if (prefs.blank_flag && prefs.filter_flag && (cfield->yblank >= 0))
for (j=blankh-1; j--; yl++)
{
bpt = bpt0 = blankpad + w*(yl%blankh);
scant = &PIX(cfield, 0, cfield->yblank);
for (i=w; i--; scant++)
if (*(bpt++))
*scant = -BIG;
if (dfield)
{
bpt = bpt0;
scant = &PIX(field, 0, cfield->yblank);
for (i=w; i--; scant++)
if (*(bpt++))
*scant = -BIG;
}
cfield->yblank++;
if (dfield)
field->yblank = cfield->yblank;
}
/* Now that all "detected" pixels have been removed, analyse detections */
ontotal = 0;
for (j=cleanobjlist->nobj; j--;)
{
if ((prefs.prof_flag && !(thecat.ntotal%10) && thecat.ntotal != ontotal)
|| !(thecat.ntotal%400))
NPRINTF(OUTPUT, "\33[1M> Line:%5d "
"Objects: %8d detected / %8d sextracted\n\33[1A",
h, thecat.ndetect, thecat.ntotal);
ontotal = thecat.ntotal;
endobject(field, dfield, wfield, cdwfield, 0, cleanobjlist);
subcleanobj(0);
}
endclean();
/*Free memory */
if (prefs.filter_flag && cdwfield && PLISTEXIST(wflag))
free(cdwscanp);
freeparcelout();
free(pixel); pixel = NULL;
lutzfree();
free(info); info = NULL;
free(store); store = NULL;
free(marker); marker = NULL;
free(dumscan); dumscan = NULL;
free(psstack); psstack = NULL;
free(start); start = NULL;
free(end); end = NULL;
if (prefs.blank_flag && prefs.filter_flag)
free(blankpad); blankpad = NULL;
return;
}
/****************************** extract **************************************/
int sep_extract(PIXTYPE *im, PIXTYPE *var, int w, int h,
PIXTYPE thresh, int minarea,
float *conv, int convw, int convh,
int deblend_nthresh, double deblend_mincont,
int clean_flag, double clean_param,
int *nobj, sepobj **objects)
{
static infostruct curpixinfo, *info, *store, initinfo, freeinfo, *victim;
objliststruct objlist, *finalobjlist;
pliststruct *pixel, *pixt;
char *marker, newmarker;
int co, i, j, flag, luflag, pstop, xl, xl2, yl, cn,
nposize, stacksize, maxpixnb, convn, status;
short trunflag;
PIXTYPE relthresh, cdnewsymbol;
PIXTYPE *scan,*cdscan,*cdwscan,*wscan,*dumscan;
float sum, *convnorm;
pixstatus cs, ps, *psstack;
int *start, *end, *survives;
status = RETURN_OK;
char errtext[80]; /* 80 should be more than enough */
pixel = NULL;
convnorm = NULL;
scan = wscan = cdscan = cdwscan = dumscan = NULL;
victim = NULL;
info = NULL;
store = NULL;
marker = NULL;
psstack = NULL;
start = end = NULL;
finalobjlist = NULL; /* final return value */
convn = 0;
sum = 0.0;
/* var is the image variance to use for thresholding, if available */
relthresh = var? thresh : 0.0;/* To avoid gcc warnings*/
objlist.dthresh = thresh;
objlist.thresh = thresh;
/*Allocate memory for buffers */
stacksize = w+1;
QMALLOC(info, infostruct, stacksize, status);
QCALLOC(store, infostruct, stacksize, status);
QMALLOC(marker, char, stacksize, status);
QMALLOC(dumscan, PIXTYPE, stacksize, status);
QMALLOC(psstack, pixstatus, stacksize, status);
QCALLOC(start, int, stacksize, status);
QMALLOC(end, int, stacksize, status);
if ((status = lutzalloc(w, h)) != RETURN_OK)
goto exit;
if ((status = allocdeblend(deblend_nthresh)) != RETURN_OK)
goto exit;
/* More initializations */
initinfo.pixnb = 0;
initinfo.flag = 0;
initinfo.firstpix = initinfo.lastpix = -1;
for (xl=0; xl<stacksize; xl++)
{
marker[xl] = 0 ;
dumscan[xl] = -BIG ;
}
co = pstop = 0;
objlist.nobj = 1;
curpixinfo.pixnb = 1;
/* Init finalobjlist (the return catalog) */
QMALLOC(finalobjlist, objliststruct, 1, status);
finalobjlist->obj = NULL;
finalobjlist->plist = NULL;
finalobjlist->nobj = finalobjlist->npix = 0;
/* Allocate memory for the pixel list */
plistinit(conv, var);
if (!(pixel = objlist.plist = malloc(nposize=MEMORY_PIXSTACK*plistsize)))
{
status = MEMORY_ALLOC_ERROR;
goto exit;
}
/*----- at the beginning, "free" object fills the whole pixel list */
freeinfo.firstpix = 0;
freeinfo.lastpix = nposize-plistsize;
pixt = pixel;
for (i=plistsize; i<nposize; i += plistsize, pixt += plistsize)
PLIST(pixt, nextpix) = i;
PLIST(pixt, nextpix) = -1;
if (conv)
{
/* allocate memory for convolved buffers */
QMALLOC(cdscan, PIXTYPE, stacksize, status);
if (var)
QCALLOC(cdwscan, PIXTYPE, stacksize, status);
/* normalize the filter */
convn = convw * convh;
QMALLOC(convnorm, PIXTYPE, convn, status);
for (i=0; i<convn; i++)
sum += fabs(conv[i]);
for (i=0; i<convn; i++)
convnorm[i] = conv[i] / sum;
}
/*----- MAIN LOOP ------ */
for (yl=0; yl<=h; yl++)
{
ps = COMPLETE;
cs = NONOBJECT;
/* Need an empty line for Lutz' algorithm to end gracely */
if (yl==h)
{
if (conv)
{
free(cdscan);
cdscan = NULL;
if (var)
{
free(cdwscan);
cdwscan = NULL;
}
}
cdwscan = cdscan = dumscan;
}
else
{
scan = im + yl*w;
if (var)
wscan = var + yl*w;
/* filter the lines */
if (conv)
{
convolve(im, w, h, yl, convnorm, convw, convh, cdscan);
if (var)
convolve(var, w, h, yl, convnorm, convw, convh, cdwscan);
}
else
{
cdscan = scan;
cdwscan = wscan;
}
}
trunflag = (yl==0 || yl==h-1)? SEP_OBJ_TRUNC:0;
for (xl=0; xl<=w; xl++)
{
if (xl == w)
cdnewsymbol = -BIG;
else
cdnewsymbol = cdscan[xl];
newmarker = marker[xl]; /* marker at this pixel */
marker[xl] = 0;
curpixinfo.flag = trunflag;
if (var)
thresh = relthresh * sqrt((xl==w || yl==h)? 0.0:cdwscan[xl]);
luflag = cdnewsymbol > thresh? 1: 0; /* is pixel above thresh? */
if (luflag)
{
/* flag the current object if we're near the image bounds */
if (xl==0 || xl==w-1)
curpixinfo.flag |= SEP_OBJ_TRUNC;
/* point pixt to first free pixel in pixel list */
/* and increment the "first free pixel" */
pixt = pixel + (cn=freeinfo.firstpix);
freeinfo.firstpix = PLIST(pixt, nextpix);
curpixinfo.lastpix = curpixinfo.firstpix = cn;
/* set values for the new pixel */
PLIST(pixt, nextpix) = -1;
PLIST(pixt, x) = xl;
PLIST(pixt, y) = yl;
PLIST(pixt, value) = scan[xl];
if (PLISTEXIST(cdvalue))
PLISTPIX(pixt, cdvalue) = cdnewsymbol;
if (PLISTEXIST(var))
PLISTPIX(pixt, var) = wscan[xl];
/* Check if we are running out of free pixels in objlist.plist */
/* (previously, the largest object became a "victim") */
if (freeinfo.firstpix==freeinfo.lastpix)
{
status = SEP_INTERNAL_ERROR;
sprintf(errtext, "Pixel stack overflow at position %d,%d.",
xl+1, yl+1);
put_errdetail(errtext);
goto exit;
/* NOTE: The above error was originally just a warning.
with the change to an error, the following code in this
if block is never executed.
TODO: should this just be a warning (or nothing?)
*/
/* loop over pixels in row to find largest object */
maxpixnb = 0;
for (i=0; i<=w; i++)
if (store[i].pixnb>maxpixnb)
if (marker[i]=='S' || (newmarker=='S' && i==xl))
{
flag = 0;
if (i<xl)
for (j=0; j<=co; j++)
flag |= (start[j]==i);
if (!flag)
maxpixnb = (victim = &store[i])->pixnb;
}
for (j=1; j<=co; j++)
if (info[j].pixnb>maxpixnb)
maxpixnb = (victim = &info[j])->pixnb;
if ((!maxpixnb) || (maxpixnb <= 1))
{
status = SEP_INTERNAL_ERROR;
goto exit;
}
freeinfo.firstpix = PLIST(pixel+victim->firstpix, nextpix);
PLIST(pixel+victim->lastpix, nextpix) = freeinfo.lastpix;
PLIST(pixel+(victim->lastpix=victim->firstpix), nextpix) = -1;
victim->pixnb = 1;
victim->flag |= SEP_OBJ_OVERFLOW;
}
/*------------------------------------------------------------*/
/* if the current status on this line is not already OBJECT... */
/* start segment */
if (cs != OBJECT)
{
cs = OBJECT;
if (ps == OBJECT)
{
if (start[co] == UNKNOWN)
{
marker[xl] = 'S';
start[co] = xl;
}
else
marker[xl] = 's';
}
else
{
psstack[pstop++] = ps;
marker[xl] = 'S';
start[++co] = xl;
ps = COMPLETE;
info[co] = initinfo;
}
}
} /* closes if pixel above threshold */
/* process new marker ---------------------------------------------*/
/* newmarker is marker[ ] at this pixel position before we got to
it. We'll only enter this if marker[ ] was set on a previous
loop iteration. */
if (newmarker)
{
if (newmarker == 'S')
{
psstack[pstop++] = ps;
if (cs == NONOBJECT)
{
psstack[pstop++] = COMPLETE;
info[++co] = store[xl];
start[co] = UNKNOWN;
}
else
update(&info[co], &store[xl], pixel);
ps = OBJECT;
}
else if (newmarker == 's')
{
if ((cs == OBJECT) && (ps == COMPLETE))
{
pstop--;
xl2 = start[co];
update (&info[co-1],&info[co], pixel);
if (start[--co] == UNKNOWN)
start[co] = xl2;
else
marker[xl2] = 's';
}
ps = OBJECT;
}
else if (newmarker == 'f')
ps = INCOMPLETE;
else if (newmarker == 'F')
{
ps = psstack[--pstop];
if ((cs == NONOBJECT) && (ps == COMPLETE))
{
if (start[co] == UNKNOWN)
{
if ((int)info[co].pixnb >= minarea)
{
status = sortit(&info[co], &objlist, minarea,
finalobjlist,
deblend_nthresh,deblend_mincont);
if (status != RETURN_OK)
goto exit;
}
/* free the chain-list */
PLIST(pixel+info[co].lastpix, nextpix) =
freeinfo.firstpix;
freeinfo.firstpix = info[co].firstpix;
}
else
{
marker[end[co]] = 'F';
store[start[co]] = info[co];
}
co--;
ps = psstack[--pstop];
}
}
}
/* end of if (newmarker) ------------------------------------------*/
/* update the info or end segment */
if (luflag)
{
update(&info[co], &curpixinfo, pixel);
}
else if (cs == OBJECT)
{
cs = NONOBJECT;
if (ps != COMPLETE)
{
marker[xl] = 'f';
end[co] = xl;
}
else
{
ps = psstack[--pstop];
marker[xl] = 'F';
store[start[co]] = info[co];
co--;
}
}
} /*------------ End of the loop over the x's -----------------------*/
} /*---------------- End of the loop over the y's -----------------------*/
/* convert `finalobjlist` to an array of `sepobj` structs */
if (clean_flag)
{
/* Calculate mthresh for all objects in the list (needed for cleaning) */
for (i=0; i<finalobjlist->nobj; i++)
{
status = analysemthresh(i, finalobjlist, minarea, thresh);
if (status != RETURN_OK)
goto exit;
}
QMALLOC(survives, int, finalobjlist->nobj, status);
clean(finalobjlist, clean_param, survives);
/* count surviving objects and allocate space accordingly*/
*nobj = 0;
for (i=0; i<finalobjlist->nobj; i++)
*nobj += survives[i];
QMALLOC(*objects, sepobj, *nobj, status);
/* fill */
j=0;
for (i=0; i<finalobjlist->nobj; i++)
if (survives[i])
convertobj(i, finalobjlist, (*objects) + j++, w);
}
else
{
int analysemthresh(int objnb, objliststruct *objlist, int minarea,
PIXTYPE thresh)
{
objstruct *obj = objlist->obj+objnb;
pliststruct *pixel = objlist->plist;
pliststruct *pixt;
PIXTYPE tpix;
float *heap,*heapt,*heapj,*heapk, swap;
int j, k, h, status;
status = RETURN_OK;
heap = heapt = heapj = heapk = NULL;
h = minarea;
if (obj->fdnpix < minarea)
{
obj->mthresh = 0.0;
return status;
}
QMALLOC(heap, float, minarea, status);
heapt = heap;
/*-- Find the minareath pixel in decreasing intensity for CLEANing */
for (pixt=pixel+obj->firstpix; pixt>=pixel; pixt=pixel+PLIST(pixt,nextpix))
{
/* amount pixel is above threshold */
tpix = PLISTPIX(pixt, cdvalue) - (PLISTEXIST(thresh)?
PLISTPIX(pixt, thresh):thresh);
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--;
}
obj->mthresh = *heap;
exit:
free(heap);
return status;
}
void analyse(int no, objliststruct *objlist, int robust, double gain)
{
objstruct *obj = &objlist->obj[no];
pliststruct *pixel = objlist->plist, *pixt;
PIXTYPE peak, val, cval;
double thresh,thresh2, t1t2,darea,
mx,my, mx2,my2,mxy, rv, rv2, tv,
xm,ym, xm2,ym2,xym,
temp,temp2, theta,pmx2,pmy2,
errx2, erry2, errxy, cvar, cvarsum;
int x, y, xmin, ymin, area2, dnpix;
preanalyse(no, objlist);
dnpix = 0;
mx = my = tv = 0.0;
mx2 = my2 = mxy = 0.0;
cvarsum = errx2 = erry2 = errxy = 0.0;
thresh = obj->thresh;
peak = obj->dpeak;
rv = obj->fdflux;
rv2 = rv * rv;
thresh2 = (thresh + peak)/2.0;
area2 = 0;
xmin = obj->xmin;
ymin = obj->ymin;
for (pixt=pixel+obj->firstpix; pixt>=pixel; pixt=pixel+PLIST(pixt,nextpix))
{
x = PLIST(pixt,x)-xmin; /* avoid roundoff errors on big images */
y = PLIST(pixt,y)-ymin; /* avoid roundoff errors on big images */
cval = PLISTPIX(pixt, cdvalue);
tv += (val = PLISTPIX(pixt, value));
if (val>thresh)
dnpix++;
if (val > thresh2)
area2++;
mx += cval * x;
my += cval * y;
mx2 += cval * x*x;
my2 += cval * y*y;
mxy += cval * x*y;
}
/* compute object's properties */
xm = mx / rv; /* mean x */
ym = my / rv; /* mean y */
/* In case of blending, use previous barycenters */
if ((robust) && (obj->flag & SEP_OBJ_MERGED))
{
double xn, yn;
xn = obj->mx-xmin;
yn = obj->my-ymin;
xm2 = mx2 / rv + xn*xn - 2*xm*xn;
ym2 = my2 / rv + yn*yn - 2*ym*yn;
xym = mxy / rv + xn*yn - xm*yn - xn*ym;
xm = xn;
ym = yn;
}
else
{
xm2 = mx2 / rv - xm * xm; /* variance of x */
ym2 = my2 / rv - ym * ym; /* variance of y */
xym = mxy / rv - xm * ym; /* covariance */
}
/* Calculate the errors on the variances */
for (pixt=pixel+obj->firstpix; pixt>=pixel; pixt=pixel+PLIST(pixt,nextpix))
{
x = PLIST(pixt,x)-xmin; /* avoid roundoff errors on big images */
y = PLIST(pixt,y)-ymin; /* avoid roundoff errors on big images */
cvar = PLISTEXIST(var)? PLISTPIX(pixt, var): 0.0;
if (gain > 0.0) { /* add poisson noise if given */
cval = PLISTPIX(pixt, cdvalue);
if (cval > 0.0) cvar += cval / gain;
}
/* Note that this works for both blended and non-blended cases
* because xm is set to xn above for the blended case. */
cvarsum += cvar;
errx2 += cvar * (x - xm) * (x - xm);
erry2 += cvar * (y - ym) * (y - ym);
errxy += cvar * (x - xm) * (y - ym);
}
errx2 /= rv2;
erry2 /= rv2;
errxy /= rv2;
/* Handle fully correlated x/y (which cause a singularity...) */
if ((temp2=xm2*ym2-xym*xym)<0.00694)
{
xm2 += 0.0833333;
ym2 += 0.0833333;
temp2 = xm2*ym2-xym*xym;
obj->flag |= SEP_OBJ_SINGU;
/* handle it for the error parameters */
cvarsum *= 0.08333/rv2;
if (errx2*erry2 - errxy * errxy < cvarsum * cvarsum) {
errx2 += cvarsum;
erry2 += cvarsum;
}
}
if ((fabs(temp=xm2-ym2)) > 0.0)
theta = atan2(2.0 * xym, temp) / 2.0;
else
theta = PI/4.0;
temp = sqrt(0.25*temp*temp+xym*xym);
pmy2 = pmx2 = 0.5*(xm2+ym2);
pmx2+=temp;
pmy2-=temp;
obj->dnpix = (LONG)dnpix;
obj->dflux = tv;
obj->mx = xm+xmin; /* add back xmin */
obj->my = ym+ymin; /* add back ymin */
obj->mx2 = xm2;
obj->errx2 = errx2;
obj->my2 = ym2;
obj->erry2 = erry2;
obj->mxy = xym;
obj->errxy = errxy;
obj->a = (float)sqrt(pmx2);
obj->b = (float)sqrt(pmy2);
obj->theta = theta;
obj->cxx = (float)(ym2/temp2);
obj->cyy = (float)(xm2/temp2);
obj->cxy = (float)(-2*xym/temp2);
darea = (double)area2 - dnpix;
t1t2 = thresh/thresh2;
/* debugging */
/*if (t1t2>0.0 && !PLISTEXIST(thresh)) */ /* was: prefs.dweight_flag */
if (t1t2 > 0.0)
{
obj->abcor = (darea<0.0?darea:-1.0)/(2*PI*log(t1t2<1.0?t1t2:0.99)
*obj->a*obj->b);
if (obj->abcor>1.0)
obj->abcor = 1.0;
}
else
{
obj->abcor = 1.0;
}
return;
}
/*
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, profflag, minarea, gainflag;
double tv,sigtv, ngamma,
esum, emx2,emy2,emxy, err,gain,backnoise2,dbacknoise2,
xm,ym, x,y,var,var2, profflux,proffluxvar;
float *heap,*heapt,*heapj,*heapk, swap;
PIXTYPE pix, cdpix, tpix, peak,cdpeak, thresh,dthresh;
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);
profflag = FLAG(obj.flux_prof);
gain = prefs.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 = profflux = proffluxvar = 0.0;
var = backnoise2 = field->backsig*field->backsig;
peak = -BIG;
cdpeak = -BIG;
thresh = field->thresh;
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);
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 (profflag && cdpix>0.0)
{
profflux += cdpix*pix;
proffluxvar += cdpix*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;
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
hmedian(heap, minarea);
h--;
}
}
/* Flagging from the flag-map */
if (PLISTEXIST(flag))
getflags(obj, pixel);
if (cleanflag)
{
obj->mthresh = *heap;
free(heap);
}
if (profflag)
{
obj->flux_prof = obj->fdflux>0.0? (float)(profflux/obj->fdflux) : 0.0;
obj->fluxerr_prof = obj->fdflux>0.0? (float)(proffluxvar/obj->fdflux):0.0;
}
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 profiles (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 -= 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)(prefs.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;
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;
}
