Changeset 27840 for branches/simtest_nebulous_branches/psphot/src/psphotSourceStats.c

Timestamp:

May 3, 2010, 8:50:52 AM (16 years ago)

Author:

eugene

Message:

updates from trunk

Location:

branches/simtest_nebulous_branches

Files:

• . (modified) (1 prop)
• psphot (modified) (1 prop)
• psphot/src (modified) (1 prop)
• psphot/src/psphotSourceStats.c (modified) (13 diffs)

branches/simtest_nebulous_branches/psphot/src

@@ -18 +18 @@
 psphotVersionDefinitions.h
 psphotMomentsStudy
+psphotPetrosianStudy
+psphotForced
+psphotMakePSF
+psphotStack

@@ -18 +18 @@
 psphotVersionDefinitions.h
 psphotMomentsStudy
+psphotPetrosianStudy
+psphotForced
+psphotMakePSF
+psphotStack

branches/simtest_nebulous_branches/psphot/src/psphotSourceStats.c

@@ -1 +1 @@
 # include "psphotInternal.h"
 
-psArray *psphotSourceStats (pmConfig *config, pmReadout *readout, pmDetections *detections) {
+// convert detections to sources and measure their basic properties (moments, local sky, sky
+// variance) Note: this function only generates sources for the new peaks (peak->assigned).
+// The new sources are added to any existing sources on detections->newSources.  The sources 
+// on detections->allSources are ignored.
+bool psphotSourceStats (pmConfig *config, const pmFPAview *view, bool setWindow)
+{
+    bool status = true;
+
+    // select the appropriate recipe information
+    psMetadata *recipe  = psMetadataLookupPtr (&status, config->recipes, PSPHOT_RECIPE);
+    psAssert (recipe, "missing recipe?");
+
+    int num = psMetadataLookupS32 (&status, config->arguments, "PSPHOT.INPUT.NUM");
+    psAssert (status, "programming error: must define PSPHOT.INPUT.NUM");
+
+    // loop over the available readouts
+    for (int i = 0; i < num; i++) {
+        if (!psphotSourceStatsReadout (config, view, "PSPHOT.INPUT", i, recipe, setWindow)) {
+            psError (PSPHOT_ERR_CONFIG, false, "failed to find initial detections for PSPHOT.INPUT entry %d", i);
+            return false;
+        }
+    }
+    return true;
+}
+
+bool psphotSourceStatsReadout (pmConfig *config, const pmFPAview *view, const char *filename, int index, psMetadata *recipe, bool setWindow) {
 
     bool status = false;
@@ -8 +33 @@
     psTimerStart ("psphot.stats");
 
-    // select the appropriate recipe information
-    psMetadata *recipe  = psMetadataLookupPtr (&status, config->recipes, PSPHOT_RECIPE);
-    assert (recipe);
+    // find the currently selected readout
+    pmFPAfile *file = pmFPAfileSelectSingle(config->files, filename, index); // File of interest
+    psAssert (file, "missing file?");
+
+    pmReadout *readout = pmFPAviewThisReadout(view, file->fpa);
+    psAssert (readout, "missing readout?");
+
+    pmDetections *detections = psMetadataLookupPtr (&status, readout->analysis, "PSPHOT.DETECTIONS");
+    psAssert (detections, "missing detections?");
+
+    // XXX TEST:
+    if (detections->allSources) {
+        psphotMaskCosmicRayFootprintCheck(detections->allSources);
+    }
+    if (detections->newSources) {
+        psphotMaskCosmicRayFootprintCheck(detections->newSources);
+    }
 
     // determine the number of allowed threads
@@ -19 +58 @@
 
     // determine properties (sky, moments) of initial sources
-    float OUTER    = psMetadataLookupF32 (&status, recipe, "SKY_OUTER_RADIUS");
-    if (!status) return NULL;
+    float OUTER = psMetadataLookupF32 (&status, recipe, "SKY_OUTER_RADIUS");
+    psAssert (status, "missing SKY_OUTER_RADIUS in recipe?");
+
+    // XXX this seems like an arbitrary number...
+    OUTER = PS_MAX(OUTER, 20.0); // XXX Guarantee that we can encompass the max moments radius
+
     char *breakPt  = psMetadataLookupStr (&status, recipe, "BREAK_POINT");
-    if (!status) return NULL;
+    psAssert (status, "missing BREAK_POINT?");
+
+    float INNER        = psMetadataLookupF32 (&status, recipe, "SKY_INNER_RADIUS"); psAssert (status, "missing SKY_INNER_RADIUS");
+    float MIN_SN       = psMetadataLookupF32 (&status, recipe, "MOMENTS_SN_MIN"); psAssert (status, "missing MOMENTS_SN_MIN");
+
+    // bit-masks to test for good/bad pixels
+    psImageMaskType maskVal = psMetadataLookupImageMask(&status, recipe, "MASK.PSPHOT");
+    psAssert (maskVal, "missing MASK.PSPHOT");
+
+    // bit-mask to mark pixels not used in analysis
+    psImageMaskType markVal = psMetadataLookupImageMask(&status, recipe, "MARK.PSPHOT");
+    psAssert (markVal, "missing MARK.PSPHOT");
 
     psArray *peaks = detections->peaks;
     if (!peaks) {
         psError(PS_ERR_UNEXPECTED_NULL, false, "No peaks found!");
-        return NULL;
+        return false;
     }
 
     // generate the array of sources, define the associated pixel
-    sources = psArrayAllocEmpty (peaks->n);
+    if (!detections->newSources) {
+        detections->newSources = psArrayAllocEmpty (peaks->n);
+    }
+    sources = detections->newSources;
+
+    // if there are no peaks, we save the empty source array and return
+    if (!peaks->n) {
+        return true;
+    }
 
     for (int i = 0; i < peaks->n; i++) {
@@ -40 +102 @@
         // create a new source
         pmSource *source = pmSourceAlloc();
+        source->imageID = index;
 
         // add the peak
@@ -53 +116 @@
         psArrayAdd (sources, 100, source);
         psFree (source);
+    }
+
+    if (!strcasecmp (breakPt, "PEAKS")) {
+        psLogMsg ("psphot", PS_LOG_INFO, "%ld sources : %f sec\n", sources->n, psTimerMark ("psphot.stats"));
+        psLogMsg ("psphot", PS_LOG_INFO, "break point PEAKS, skipping MOMENTS\n");
+        psphotVisualShowMoments (sources);
+        return true;
+    }
+
+    if (setWindow) {
+        if (!psphotSetMomentsWindow(recipe, readout->analysis, sources)) {
+            psError(PS_ERR_UNEXPECTED_NULL, false, "Failed to determine Moments Window!");
+            psFree(detections->newSources);
+            return false;
+        }
+    }
+
+    // if we have measured the window, we will be saving the modified version of these recipe values on readout->analysis
+    float SIGMA = psMetadataLookupF32 (&status, readout->analysis, "MOMENTS_GAUSS_SIGMA");
+    if (!status) {
+        SIGMA = psMetadataLookupF32 (&status, recipe, "MOMENTS_GAUSS_SIGMA");
+    }
+    float RADIUS = psMetadataLookupF32 (&status, readout->analysis, "PSF_MOMENTS_RADIUS");
+    if (!status) {
+        RADIUS = psMetadataLookupF32 (&status, recipe, "PSF_MOMENTS_RADIUS");
+    }
+
+    // threaded measurement of the source magnitudes
+    int Nfail = 0;
+    int Nmoments = 0;
+    int Nfaint = 0;
+
+    // choose Cx, Cy (see psphotThreadTools.c for overview of the concepts)
+    int Cx = 1, Cy = 1;
+    psphotChooseCellSizes (&Cx, &Cy, readout, nThreads);
+
+    psArray *cellGroups = psphotAssignSources (Cx, Cy, sources);
+
+    for (int i = 0; i < cellGroups->n; i++) {
+
+        psArray *cells = cellGroups->data[i];
+
+        for (int j = 0; j < cells->n; j++) {
+
+            // allocate a job -- if threads are not defined, this just runs the job
+            psThreadJob *job = psThreadJobAlloc ("PSPHOT_SOURCE_STATS");
+
+            psArrayAdd(job->args, 1, cells->data[j]); // sources
+
+            PS_ARRAY_ADD_SCALAR(job->args, INNER,   PS_TYPE_F32);
+            PS_ARRAY_ADD_SCALAR(job->args, MIN_SN,  PS_TYPE_F32);
+            PS_ARRAY_ADD_SCALAR(job->args, RADIUS,  PS_TYPE_F32);
+            PS_ARRAY_ADD_SCALAR(job->args, SIGMA,   PS_TYPE_F32);
+
+            PS_ARRAY_ADD_SCALAR(job->args, maskVal, PS_TYPE_IMAGE_MASK);
+            PS_ARRAY_ADD_SCALAR(job->args, markVal, PS_TYPE_IMAGE_MASK);
+
+            PS_ARRAY_ADD_SCALAR(job->args, 0, PS_TYPE_S32); // this is used as a return value for Nmoments
+            PS_ARRAY_ADD_SCALAR(job->args, 0, PS_TYPE_S32); // this is used as a return value for Nfail
+            PS_ARRAY_ADD_SCALAR(job->args, 0, PS_TYPE_S32); // this is used as a return value for Nfaint
+
+            if (!psThreadJobAddPending(job)) {
+                psError(PS_ERR_UNKNOWN, false, "Unable to launch thread job PSPHOT_SOURCE_STATS");
+                psFree (job);
+                psFree(detections->newSources);
+                return false;
+            }
+            psFree(job);
+        }
+
+        // wait for the threads to finish and manage results
+        if (!psThreadPoolWait (false)) {
+            psError(PS_ERR_UNKNOWN, false, "Failure in thread job PSPHOT_SOURCE_STATS");
+            psFree(detections->newSources);
+            return false;
+        }
+
+        // we have only supplied one type of job, so we can assume the types here
+        psThreadJob *job = NULL;
+        while ((job = psThreadJobGetDone()) != NULL) {
+            if (job->args->n < 1) {
+                fprintf (stderr, "error with job\n");
+            } else {
+                psScalar *scalar = NULL;
+                scalar = job->args->data[7];
+                Nmoments += scalar->data.S32;
+                scalar = job->args->data[8];
+                Nfail += scalar->data.S32;
+                scalar = job->args->data[9];
+                Nfaint += scalar->data.S32;
+            }
+            psFree(job);
+        }
+    }
+
+    psFree (cellGroups);
+
+    psLogMsg ("psphot", PS_LOG_INFO, "%ld sources, %d moments, %d faint, %d failed: %f sec\n", sources->n, Nmoments, Nfaint, Nfail, psTimerMark ("psphot.stats"));
+
+    psphotVisualShowMoments (sources);
+
+    if (detections->allSources) {
+        psphotMaskCosmicRayFootprintCheck(detections->allSources);
+    }
+    if (detections->newSources) {
+        psphotMaskCosmicRayFootprintCheck(detections->newSources);
+    }
+
+    return true;
+}
+
+// this function is currently only called by psphotCheckExtSources
+bool psphotSourceStatsUpdate (psArray *sources, pmConfig *config, pmReadout *readout) {
+
+    bool status = false;
+
+    psTimerStart ("psphot.stats");
+
+    // select the appropriate recipe information
+    psMetadata *recipe  = psMetadataLookupPtr (&status, config->recipes, PSPHOT_RECIPE);
+    assert (recipe);
+
+    // determine the number of allowed threads
+    int nThreads = psMetadataLookupS32(&status, config->arguments, "NTHREADS"); // Number of threads
+    if (!status) {
+        nThreads = 0;
+    }
+
+    // determine properties (sky, moments) of initial sources
+    float OUTER    = psMetadataLookupF32 (&status, recipe, "SKY_OUTER_RADIUS");
+    if (!status) return false;
+
+    OUTER = PS_MAX(OUTER, 20.0); // XXX Guarantee that we can encompass the max moments radius
+
+    char *breakPt  = psMetadataLookupStr (&status, recipe, "BREAK_POINT");
+    if (!status) return false;
+
+    for (int i = 0; i < sources->n; i++) {
+
+        pmSource *source = sources->data[i];
+        if (!source->peak) continue; // XXX how can we have a peak-less source?
+
+        // allocate space for moments
+        if (!source->moments) {
+            source->moments = pmMomentsAlloc();
+        }
+
+        // allocate image, weight, mask arrays for each peak (square of radius OUTER)
+        pmSourceDefinePixels (source, readout, source->peak->x, source->peak->y, OUTER);
+        source->peak->assigned = true;
     }
 
@@ -62 +275 @@
     }
 
+    // XXX how else could we get the window size in?
+    if (!psphotSetMomentsWindow(recipe, readout->analysis, sources)) {
+        psError(PS_ERR_UNEXPECTED_NULL, false, "Failed to determine Moments Window!");
+        return NULL;
+    }
+
     // threaded measurement of the source magnitudes
     int Nfail = 0;
@@ -82 +301 @@
             psThreadJob *job = psThreadJobAlloc ("PSPHOT_SOURCE_STATS");
 
+            // XXX: this must match the above
             psArrayAdd(job->args, 1, cells->data[j]); // sources
             psArrayAdd(job->args, 1, recipe);
@@ -136 +356 @@
 
     psArray *sources                = job->args->data[0];
-    psMetadata *recipe              = job->args->data[1];
-
-    float INNER        = psMetadataLookupF32 (&status, recipe, "SKY_INNER_RADIUS");
-    if (!status) return false;
-    float MIN_SN       = psMetadataLookupF32 (&status, recipe, "MOMENTS_SN_MIN");
-    if (!status) return false;
-    float RADIUS       = psMetadataLookupF32 (&status, recipe, "PSF_MOMENTS_RADIUS");
-    if (!status) return false;
-    float MIN_PIXEL_SN = psMetadataLookupF32 (&status, recipe, "MOMENTS_MIN_PIXEL_SN");
-    if (!status) return false;
-    float SIGMA        = psMetadataLookupF32 (&status, recipe, "MOMENTS_GAUSS_SIGMA");
-    if (!status) return false;
-
-    // bit-masks to test for good/bad pixels
-    psImageMaskType maskVal = psMetadataLookupImageMask(&status, recipe, "MASK.PSPHOT");
-    assert (maskVal);
-
-    // bit-mask to mark pixels not used in analysis
-    psImageMaskType markVal = psMetadataLookupImageMask(&status, recipe, "MARK.PSPHOT");
-    assert (markVal);
+
+    float INNER                     = PS_SCALAR_VALUE(job->args->data[1],F32);
+    float MIN_SN                    = PS_SCALAR_VALUE(job->args->data[2],F32);
+    float RADIUS                    = PS_SCALAR_VALUE(job->args->data[3],F32);
+    float SIGMA                     = PS_SCALAR_VALUE(job->args->data[4],F32);
+
+    psImageMaskType maskVal         = PS_SCALAR_VALUE(job->args->data[5],PS_TYPE_IMAGE_MASK_DATA);
+    psImageMaskType markVal         = PS_SCALAR_VALUE(job->args->data[6],PS_TYPE_IMAGE_MASK_DATA);
 
     // maskVal is used to test for rejected pixels, and must include markVal
@@ -166 +374 @@
     for (int i = 0; i < sources->n; i++) {
         pmSource *source = sources->data[i];
+
+        if (source->tmpFlags & PM_SOURCE_TMPF_MOMENTS_MEASURED) continue;
+        source->tmpFlags |= PM_SOURCE_TMPF_MOMENTS_MEASURED;
 
         // skip faint sources for moments measurement
@@ -194 +405 @@
         }
 
-        // measure basic source moments
-        status = pmSourceMoments (source, RADIUS, SIGMA, MIN_PIXEL_SN);
+        // measure basic source moments (no S/N clipping on input pixels)
+        status = pmSourceMoments (source, RADIUS, SIGMA, 0.0, maskVal);
         if (status) {
             Nmoments ++;
@@ -205 +416 @@
         BIG_RADIUS = PS_MIN (INNER, 3*RADIUS);
         psTrace ("psphot", 4, "retrying moments for %d, %d\n", source->peak->x, source->peak->y);
-        status = pmSourceMoments (source, BIG_RADIUS, 3.0*SIGMA, MIN_PIXEL_SN);
+        status = pmSourceMoments (source, BIG_RADIUS, 3.0*SIGMA, 0.0, maskVal);
         if (status) {
             source->mode |= PM_SOURCE_MODE_BIG_RADIUS;
@@ -219 +430 @@
 
     // change the value of a scalar on the array (wrap this and put it in psArray.h)
-    scalar = job->args->data[2];
+    scalar = job->args->data[7];
     scalar->data.S32 = Nmoments;
 
-    scalar = job->args->data[3];
+    scalar = job->args->data[8];
     scalar->data.S32 = Nfail;
 
-    scalar = job->args->data[4];
+    scalar = job->args->data[9];
     scalar->data.S32 = Nfaint;
 
@@ -231 +442 @@
 }
 
-# if (0)
-bool psphotSourceStats_Unthreaded (int *nfail, int *nmoments, psArray *sources, psMetadata *recipe) {
-
-    bool status = false;
-    float BIG_RADIUS;
-
-    float INNER    = psMetadataLookupF32 (&status, recipe, "SKY_INNER_RADIUS");
-    if (!status) return false;
-    float MIN_SN   = psMetadataLookupF32 (&status, recipe, "MOMENTS_SN_MIN");
-    if (!status) return false;
-    float RADIUS   = psMetadataLookupF32 (&status, recipe, "PSF_MOMENTS_RADIUS");
-    if (!status) return false;
-
-    // bit-masks to test for good/bad pixels
-    psImageMaskType maskVal = psMetadataLookupImageMask(&status, recipe, "MASK.PSPHOT");
-    assert (maskVal);
-
-    // bit-mask to mark pixels not used in analysis
-    psImageMaskType markVal = psMetadataLookupImageMask(&status, recipe, "MARK.PSPHOT");
-    assert (markVal);
-
-    // maskVal is used to test for rejected pixels, and must include markVal
-    maskVal |= markVal;
-
-    // threaded measurement of the sources moments
-    int Nfail = 0;
-    int Nmoments = 0;
-    for (int i = 0; i < sources->n; i++) {
-        pmSource *source = sources->data[i];
-
-        // skip faint sources for moments measurement
-        if (source->peak->SN < MIN_SN) {
-            continue;
-        }
-
-        // measure a local sky value
-        // the local sky is now ignored; kept here for reference only
-        status = pmSourceLocalSky (source, PS_STAT_SAMPLE_MEDIAN, INNER, maskVal, markVal);
-        if (!status) {
-            psErrorClear(); // XXX re-consider the errors raised here
-            Nfail ++;
-            continue;
-        }
-
-        // measure the local sky variance (needed if noise is not sqrt(signal))
-        // XXX EAM : this should use ROBUST not SAMPLE median, but it is broken
-        status = pmSourceLocalSkyVariance (source, PS_STAT_SAMPLE_MEDIAN, INNER, maskVal, markVal);
-        if (!status) {
-            Nfail ++;
-            psErrorClear();
-            continue;
-        }
-
-        // measure basic source moments
-        status = pmSourceMoments (source, RADIUS, SIGMA, MIN_PIXEL_SN);
-        if (status) {
-            Nmoments ++;
-            continue;
-        }
-
-        // if no valid pixels, or massive swing, likely saturated source,
-        // try a much larger box
-        BIG_RADIUS = PS_MIN (INNER, 3*RADIUS);
-        psTrace ("psphot", 4, "retrying moments for %d, %d\n", source->peak->x, source->peak->y);
-        status = pmSourceMoments (source, BIG_RADIUS, 3.0*SIGMA, MIN_PIXEL_SN);
-        if (status) {
-            Nmoments ++;
-            continue;
-        }
-
-        Nfail ++;
-        psErrorClear();
-        continue;
-    }
-
-    // change the value of a scalar on the array (wrap this and put it in psArray.h)
-    *nmoments = Nmoments;
-    *nfail = Nfail;
-
+// this function attempts to iteratively determine the best value for sigma of the moments weighting Gaussian
+// this function modifies the recipe values MOMENTS_SX_MAX, MOMENTS_SY_MAX, and PSF_CLUMP_GRID_SCALE, used by pmSourcePSFClump
+bool psphotSetMomentsWindow (psMetadata *recipe, psMetadata *analysis, psArray *sources) {
+
+    bool status;
+
+    float MIN_SN = psMetadataLookupF32 (&status, recipe, "MOMENTS_SN_MIN"); psAssert (status, "missing MOMENTS_SN_MIN");
+    float PSF_SN_LIM = psMetadataLookupF32(&status, recipe, "PSF_SN_LIM"); psAssert (status, "missing PSF_SN_LIM");
+    psF32 MOMENTS_AR_MAX = psMetadataLookupF32(&status, recipe, "MOMENTS_AR_MAX"); psAssert (status, "missing MOMENTS_AR_MAX");
+
+    // XXX move this to a config file?
+    # define NSIGMA 8
+    float sigma[NSIGMA] = {1.0, 2.0, 3.0, 4.5, 6.0, 9.0, 12.0, 18.0};
+    float Sout[NSIGMA];
+
+    // this sorts by peak->SN
+    sources = psArraySort (sources, pmSourceSortBySN);
+
+    // loop over radii:
+    for (int i = 0; i < NSIGMA; i++) {
+
+        // XXX move max source number to config
+        for (int j = 0; (j < sources->n) && (j < 400); j++) {
+
+            pmSource *source = sources->data[j];
+            psAssert (source->moments, "force moments to exist");
+            source->moments->nPixels = 0;
+
+            // skip faint sources for moments measurement
+            if (source->peak->SN < MIN_SN) {
+                continue;
+            }
+
+            // measure basic source moments (no S/N clipping on input pixels)
+            status = pmSourceMoments (source, 4*sigma[i], sigma[i], 0.0, 0xffff);
+        }
+
+        // choose a grid scale that is a fixed fraction of the psf sigma^2
+        float PSF_CLUMP_GRID_SCALE = 0.1*PS_SQR(sigma[i]);
+        float MOMENTS_SX_MAX = 2.0*PS_SQR(sigma[i]);
+        float MOMENTS_SY_MAX = 2.0*PS_SQR(sigma[i]);
+
+        // determine the PSF parameters from the source moment values
+        pmPSFClump psfClump = pmSourcePSFClump (NULL, NULL, sources, PSF_SN_LIM, PSF_CLUMP_GRID_SCALE, MOMENTS_SX_MAX, MOMENTS_SY_MAX, MOMENTS_AR_MAX);
+        psLogMsg ("psphot", 3, "radius %.1f, nStars: %d, nSigma: %5.2f, X,  Y: %f, %f (%f, %f)\n", sigma[i], psfClump.nStars, psfClump.nSigma, psfClump.X, psfClump.Y, sqrt(psfClump.X) / sigma[i], sqrt(psfClump.Y) / sigma[i]);
+
+        psMetadataAddS32 (analysis, PS_LIST_TAIL, "PSF.CLUMP.NREGIONS",  PS_META_REPLACE, "psf clump regions", 1);
+        psMetadata *regionMD = psMetadataLookupPtr (&status, analysis, "PSF.CLUMP.REGION.000");
+        if (!regionMD) {
+            regionMD = psMetadataAlloc();
+            psMetadataAddMetadata (analysis, PS_LIST_TAIL, "PSF.CLUMP.REGION.000", PS_META_REPLACE, "psf clump region", regionMD);
+            psFree (regionMD);
+        }
+        psMetadataAddF32 (regionMD, PS_LIST_TAIL, "PSF.CLUMP.X",  PS_META_REPLACE, "psf clump center", psfClump.X);
+        psMetadataAddF32 (regionMD, PS_LIST_TAIL, "PSF.CLUMP.Y",  PS_META_REPLACE, "psf clump center", psfClump.Y);
+        psMetadataAddF32 (regionMD, PS_LIST_TAIL, "PSF.CLUMP.DX", PS_META_REPLACE, "psf clump center", psfClump.dX);
+        psMetadataAddF32 (regionMD, PS_LIST_TAIL, "PSF.CLUMP.DY", PS_META_REPLACE, "psf clump center", psfClump.dY);
+
+        psphotVisualPlotMoments (recipe, analysis, sources);
+
+        Sout[i] = sqrt(0.5*(psfClump.X + psfClump.Y)) / sigma[i];
+    }
+
+    // we are looking for sigma for which Sout = 0.65 (or some other value)
+    float Sigma = NAN;
+    float minS = Sout[0];
+    float maxS = Sout[0];
+    for (int i = 0; i < NSIGMA; i++) {
+        minS = PS_MIN(Sout[i], minS);
+        maxS = PS_MAX(Sout[i], maxS);
+    }
+    if (minS > 0.65) Sigma = sigma[NSIGMA-1];
+    if (maxS < 0.65) Sigma = sigma[0];
+
+    for (int i = 0; i < NSIGMA - 1 && isnan(Sigma); i++) {
+        if (!isfinite(Sout[i]) || !isfinite(Sout[i+1])) continue;
+        if ((Sout[i] > 0.65) && (Sout[i+1] > 0.65)) continue;
+        if ((Sout[i] < 0.65) && (Sout[i+1] < 0.65)) continue;
+        Sigma = sigma[i] + (0.65 - Sout[i])*(sigma[i+1] - sigma[i])/(Sout[i+1] - Sout[i]);
+    }
+    psAssert (isfinite(Sigma), "did we miss a case?");
+
+    // choose a grid scale that is a fixed fraction of the psf sigma^2
+    psMetadataAddF32(analysis, PS_LIST_TAIL, "PSF_CLUMP_GRID_SCALE", PS_META_REPLACE, "clump grid", 0.1*PS_SQR(Sigma));
+    psMetadataAddF32(analysis, PS_LIST_TAIL, "MOMENTS_SX_MAX", PS_META_REPLACE, "moments limit", 2.0*PS_SQR(Sigma));
+    psMetadataAddF32(analysis, PS_LIST_TAIL, "MOMENTS_SY_MAX", PS_META_REPLACE, "moments limit", 2.0*PS_SQR(Sigma));
+    psMetadataAddF32(analysis, PS_LIST_TAIL, "MOMENTS_GAUSS_SIGMA", PS_META_REPLACE, "moments limit", Sigma);
+    psMetadataAddF32(analysis, PS_LIST_TAIL, "PSF_MOMENTS_RADIUS", PS_META_REPLACE, "moments limit", 4.0*Sigma);
+
+    psLogMsg ("psphot", 3, "using window function with sigma = %f\n", Sigma);
     return true;
 }
-# endif
+
+// if we use the footprints, the output peaks list contains both old and new peaks,
+// otherwise it only contains the new peaks.
+

@@ -18 +18 @@
 psphotVersionDefinitions.h
 psphotMomentsStudy
+psphotPetrosianStudy
+psphotForced
+psphotMakePSF
+psphotStack