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  1. Request For Comments
  2. RFC-630

Change background handling defaults in imageDifference.py

    Details

    • Type: RFC
    • Status: Implemented
    • Resolution: Done
    • Component/s: DM
    • Labels:
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      Description

      Image differencing tests with DECam and HSC have identified problems with background subtraction using the default ip_diffim configs (DM-20555, DM-20484).

      While investigation of these issues is ongoing, the performance improvements from adjusted configuration parameters are notable: ~15% reduction in false positives in DECam, and even larger in HSC. Accordingly we suggest changing the defaults.

      If accepted, this RFC would change to the following default configurations in imageDifference.py:

      config.differencer.subtract['al'].kernel.active.spatialBgOrder = 2
      config.differencer.doAddCalexpBackground = False
      

      The current defaults are 0 and True.

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              • Assignee:
                ebellm Eric Bellm
                Reporter:
                ebellm Eric Bellm
                Watchers:
                Eric Bellm, John Parejko, John Swinbank, Krzysztof Findeisen, Meredith Rawls, Zeljko Ivezic
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