MOPEX User's Guide - IRSA

N +
N
< Threshold _ Ratio
MOPEX User’s Guide
Equation 8.3
then their signs are flipped. If Threshold Ratio = 0.5, which is the default, the pixels within
each cluster will have the same sign.
The products of this step are the corrected dual detection maps (see Figure 8.10).
Figure 8.10: Suppose Threshold Ratio = 0.5. In Figure 4, cluster 2 has outlier fraction of
0.25, which is less than Threshold Ratio. The corrected dual map has all the pixe ls in cluste r
2 set positive. Cluster 5 in Figure 4 has an outlier fraction of 0.9, which is greater than
Threshold Ratio. The single positive pixel in cluster 5 has been set negative.
8.2.4 Box Outlier Detection
The fourth outlier detection 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 the temporal outlier. It
is implemented by the Mosaic Box Outlier module.
Basic Concepts in MOPEX 190
Out lier Det ect ion