MOPEX User's Guide - IRSA

MOPEX User’s Guide
This module does Multiframe Temporal Outlier detection (§8.2.2) on the interpolated input
images. The interpolated input frames are stacked, and for each pixe l position in the
interpolated grid, the trimmed mean and standard deviation of the pixel values in the stack is
calculated. The pixel values outside of the user-specified asymmetrical multi-sigma
thresholds are classified as outliers. This method detects both moving objects and radhits. It is
not meant to be used in the cases of shallow coverage.
The thresholds - Bottom Threshold and Top Threshold - can be set to 0, which is the default.
In this case, the decision of declaring a particular pixel an outlier is put off until running the
Mosaic RMask module. The advantage of doing it this way is that the user can experiment
with different thresholds for outliers in the Mosaic RMask module, without having to rerun
the Mosaic Outlier module.
5.6.15 Mosaic Modules: Mosaic Box Outlier
Command Line Equivalent: run_mosaic_box_outlier
Default Output Directory: /BoxOutlier-mosaic
De pe nds On: Mosaic Interpolate
Important Notes: Using this module does not mean that MOPEX will automatically use the
results for outlier detection. In order to use the results from this module, you must set Use Box
Outlier For Rmask in the Mosaic RMask module and set the RMask Fatal Mask Bit Pattern in
the Initial Setup module to use bit 3. Note that this is not the same as setting it to a value of 3. See
§8.11: Fatal Mask Bit Patterns for more information.
PURPOSE
This module uses the Box Outlier rejection method to flag bad pixels (see §8.2.4). The
method is designed to use both the temporal and spatial information like the Dual Outlier, but
it uses the statistical analysis of the kind used by Multiframe Temporal Outlier. In the
identification of temporal outliers, neighboring pixels are utilized to ensure the correct
classification.
INPUT
Box Size X(Y) direction: (int) The X (Y) size of the box of neighboring pixels used for
outlier detections.
Mosaicking (mosaic.pl) 76
Mosaic Modules