Changeset 6427 for trunk/psphot/src/psphotBasicDeblend.c

Timestamp:

Feb 14, 2006, 6:33:17 AM (20 years ago)

Author:

eugene

Message:

mods to change from threshold above sky to S/N thresholds

File:

• trunk/psphot/src/psphotBasicDeblend.c (modified) (3 diffs)

trunk/psphot/src/psphotBasicDeblend.c

@@ -2 +2 @@
 
 // 2006.02.07 : no leaks
-bool psphotBasicDeblend (psArray *sources, psMetadata *config, psStats *sky) { 
+bool psphotBasicDeblend (psArray *sources, psMetadata *config) { 
 
     int N;
@@ -18 +18 @@
     float NSIGMA   = psMetadataLookupF32 (&status, config, "DEBLEND_SKY_NSIGMA");
     if (!status) NSIGMA = 5.0;
-
-    float minThreshold = NSIGMA*sky->sampleStdev;
 
     // we need sources spatially-sorted to find overlaps
@@ -83 +81 @@
         // generate source contour (1/4 peak counts)
         // set the threshold based on user inputs
-        threshold = FRACTION * (source->peak->counts - source->moments->Sky) + source->moments->Sky; 
-        threshold = PS_MAX (threshold, minThreshold);
+        
+        // threshold is fraction of the source peak flux
+        // image is background subtracted; source->moments->Sky should always be 0.0
+        threshold = FRACTION * source->moments->Peak;
+        // threshold is no less than NSIGMA above the local median sigma?
+        threshold = PS_MAX (threshold, NSIGMA*source->moments->dSky);
 
         // generate a basic contour (set of x,y coordinates at-or-below flux level)