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<strong>MOPEX</strong> User’s <strong>Guide</strong><br />
Not all of the output files above will be produced by Mosaic Combine. Many will only be<br />
produced if requested in either APEX Settings or Mosaic CoAdder.<br />
This module is only required in the APEX flow when running APEX Multiframe or APEX<br />
User List Multiframe. If a mosaic has previously been created using Mosaic then this module<br />
can be dropped from the APEX flow, and the mosaicking results used as input instead. Note<br />
that the APEX pipeline does not carry out any outlier rejection when combining the input<br />
images into a mosaic. In order to use an outlier rejection scheme, you must run Mosaic and<br />
use the output from Mosaic as input into APEX. See §6.3.1 for instructions on how to do this.<br />
6.5.14 APEX Modules: Extract MedFilter<br />
Command Line Equivalent: run_extract_medfilter<br />
Default Output Directory: ; /Medfilter-apex<br />
De pe nds On: Detect or input user list<br />
Relevant Pipelines: All<br />
PURPOSE<br />
This module is an instance of the same MedFilter that is run during outlier rejection in the<br />
Mosaic pipeline, and earlier in the APEX pipeline (before source detection). In this case, it<br />
performs the background subtraction of the image(s) that will be used for source extraction.<br />
In Multiframe pipe lines, those are the individual input images, and in Single Frame pipelines<br />
it is the mosaic image. There are two options: the Median case (default) and the Sbkg case,<br />
which uses a background estimate like that of SExtractor.<br />
INPUT<br />
Window X, Y: (int) the X, Y size in input pixels of the window used to compute the<br />
background value.<br />
Outlie rs / Window: (int) the number of high outlier pixe ls rejected from the X*Y window<br />
when computing the Median background. For a very crowded field, the fraction of rejected<br />
pixels should be higher than for a less crowded field. Values of a few percent should be<br />
acceptable for uncrowded fields. If Outliers / Window is set too high, the background will be<br />
under-estimated.<br />
Min Good Pixels in Window: (int) The minimum number of good (non-NaN, non-masked)<br />
pixels needed to compute the median. If insufficient good pixels are present, the background<br />
Point Source Extraction (APEX) 140<br />
APEX Modules
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