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Filter page (Source Extraction)
The Filter page of the
Source Extraction Properties set inclusion
limits on basic source properties measured by the
Extract Sources command. After objects are
detected, their properties are computed. Values set in this dialog
are used to filter out objects that do not fall inside the selected
limits. For example, settingArea Min
= 2 assures that sources having a single pixel are not includes in
the final tabulation of source data. Conversely, if you only want
to detect single pixels, uncheck Area
Min and set Area Max = 2. Only
items that are checked are used.
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Filter Properties
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Area
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Sets limits for the source area, measured in
pixels.
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Ellipticity
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Sets limits for the ellipticity, or the value
1 – b/a, where b is the minor axis and a is the major axis.
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Peak
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Sets limits for the peak pixel value, as a
percentage of the range found in the detection area.
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Spacing
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Sets the minimum distance between sources,
measured in pixel units between their centers. When two sources are
closer than this distance, one or both will be deleted, depending
on the Spacing Rejection Strategy.
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Spacing Rejection Strategy
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Selects the method used to discard sources
according to the Spacing parameter:
Discard both sources:
All sources within Spacing pixels are
discarded.
Discard Greater
Source: Uses the Source
Comparison property to compare sources and discards the one
of greater value.
Discard Lesser Source:
Uses the Source Comparison property to
compare sources and discards the one of lesser value.
Discard next source:
Discards the next detected source if it satisfies the Spacing condition. Sources are usually detected
according to row order in the image.
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Source Comparison
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Selects the property used for comparing source
pairs closer than Spacing using the
Greater and Lesser strategies.
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Related Topics
Extract Sources command
Source Extraction Properties
Mira Pro x64 8.83 User's Guide, Copyright Ⓒ 2026 Mirametrics, Inc.
All Rights Reserved.
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