Changes between Version 6 and Version 7 of Background_Oversubtraction

Timestamp:

Mar 8, 2011, 5:06:48 PM (15 years ago)

Author:

eugene

Comment:

--

Background_Oversubtraction

@@ -5 +5 @@
 Here are some images to illustrate the problem, and the improvements:
 
-||  [[Image(detfilter.cnp.ims.jpg, 500px)]] || [[Image(detfilter.cnp.bck.jpg, 500px)]] ||
-||  [[Image(detfilter.cnp.bks.jpg, 500px)]] || [[Image(detfilter.cnp.det.jpg, 500px)]] ||
+||  [[Image(detfilter.cnp.ims.jpg, 800px)]] || [[Image(detfilter.cnp.bck.jpg, 800px)]] ||
+||  [[Image(detfilter.cnp.bks.jpg, 800px)]] || [[Image(detfilter.cnp.det.jpg, 800px)]] ||
 
 The upper-left image shows o5579g0223o.XY63 after detrending, but without background subtraction.  The image has been somewhat smoothed to enhance the visibility of the background variations.  Note that the variations in the background in this image are caused by clouds (and can be seen in earlier and later images from the same night).  The background ranges from ~1000 counts (black) to ~1300 counts (light yellow).
@@ -26 +26 @@
 ||  [[Image(detfilter.cnp.v0.jpg, 1000px)]] ||
 
-The image above shows a portion of the CNP image from above.  The red boxes mark all sources detected in the image; the blue boxes mark those sources which passed the above filter.  It is clear that this cut rejects a large fraction of the detections coming from the poor background subtracted region.  
+The image above shows a portion of the CNP image from above.  The red boxes mark all sources detected in the image; the blue boxes mark those sources which passed the above filter.  It is clear that this cut rejects a large fraction of the detections coming from the poor background subtracted region.  (It may be difficult to tell, but all bright stars are identified in the good sample).
 
 || [[Image(detfilter.md04.v0.jpg, 1000px)]] ||
-|| [[Image(detfilter.md04.v0.jpg, 1000px)]] ||
+|| [[Image(detfilter.md04.v1.jpg, 1000px)]] ||
 
-The above 2 images show portions of another exposure, this time of MD04.  Again, the red boxes mark all detections, while the blue boxes show the 'good' objects after filtering.
+The above 2 images show portions of another exposure, this time of MD04.  Again, the red boxes mark all detections, while the blue boxes show the 'good' objects after filtering.