taskGNU Astronomy Utilities - Tasks: task #15820, Labeled image showing pixels above...


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task #15820: Labeled image showing pixels above half maximum

Submitter:  Mohammad Akhlaghi <makhlaghi>
Submitted:  Tue 24 Nov 2020 11:56:51 AM UTC
Should Start On:  Tue 24 Nov 2020 12:00:00 AM UTC Should be Finished on:  Tue 24 Nov 2020 12:00:00 AM UTC
Category:  MakeCatalog Priority:  5 - Normal
Item Group:  Enhancement Status:  None
Privacy:  Public Assigned to:  None
Percent Complete:  0% Open/Closed:  Open
Effort:  0.00

Tue 24 Nov 2020 11:56:51 AM UTC, original submission:  

Currently all the measurements at half maximum have their own separate column/option. Therefore the number of measurements at half maximum are not too many. However, this part of the object's pixels an interesting region for any type of measurements. For example we may want to measure the ellipticity of the source at half the maximum, or any other MakeCatalog measurement.

But adding parallel options/columns will un-necessarily complicate both the source of the program and also the user (the list of options will double!).

So the best way forward is to generate a new labeled image, where for each object, only those that are within the half-maximum are preserved (with their original values) and the others are set to zero (for the objects) and -1 (for the clumps).

The new labeled images can then be fed into a second call to MakeCatalog to any possible measurement directly over this region.

This labeled image can also be used to further clean the sources.

Mohammad Akhlaghi <makhlaghi>
Group administrator


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