MOPEX User's Guide - IRSA

MOPEX User’s Guide
The program computes an asymmetrically skewed median for each pixel in the input image
using a rectangular window of Window X by Window Y pixe ls. It is achieved by omitting the
Outliers / Window highest pixels from each median window.
There is a minimum required number of good (not-NaN and not flagged by any mask) pixels
per median window Min Good Pixels In Window. If the number of good pixels is below this
threshold then the corresponding pixel in the output image is marked as a "missing" pixel.
When the median calculation is finished, the values of the marked pixels are interpolated
from the neighboring pixels for which the median has been found. In order to do so the
program scans around the pixel in question and accumulates values of good pixels. When the
number of accumulated values reaches or exceeds the minimum number given by the input
parameter Min Good Neighbors Number the program finds the average and stores this value
as the median for the pixel in question.
This module is run earlier in the APEX flow as Detect MedFilter. The input parameters for
Extract MedFilter should always be more aggressive than for Detect MedFilter (i.e. smaller
window size and number of outliers).
6.5.15 APEX Modules: Fit Radius
Command Line Equivalent: run_fit_radius
Default Output Directory: ; /Coadd-apex
De pe nds On: Detect or input user list
Relevant Pipelines: APEX Single Frame; APEX Multiframe
PURPOSE
This module determines a fitting area for each source in the detect table. If not run, the fitting
will be done for each detection using the fixed value of Fitting Area X,Y defined in the
Source Estimate module. The term "Fit Radius" is a little misleading, since all fitting is done
in a box, not a circle.
INPUT
None.
COMMAND LINE INPUT
&FIT_RADIUS
Point Source Ext ract ion (APEX) 142
APEX Modules