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  1. Data Management
  2. DM-9553

Investigate the best algorithm to compute derivatives for the Brighter-Fatter correction

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    • Story
    • Status: Done
    • Resolution: Done
    • None
    • ip_isr
    • None
    • 1
    • DRP S17-5
    • Data Release Production

    Description

      As noted in DM-9535, the method used to compute second derivatives in the Brighter-Fatter correction implementation can lead to significant (up to 1%, which is particularly significant for weak lensing considerations) differences in the trace radii of sources, with the differences becoming larger with brighter magnitudes (see figures in DM-9535). This ticket is to investigate the optimal algorithm to use for the Brighter-Fatter correction.

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            rearmstrlauren suggests that we assign this ticket to her, since she already has a fix on that branch, and have you act as reviewer. If you object, do shout!

            swinbank John Swinbank added a comment - rearmstr — lauren suggests that we assign this ticket to her, since she already has a fix on that branch, and have you act as reviewer. If you object, do shout!

            rearmstr, do you have time to review this?

            lauren Lauren MacArthur added a comment - rearmstr , do you have time to review this?

            Yep, I'll take a look.

            rearmstr Bob Armstrong added a comment - Yep, I'll take a look.

            Looks good.

            rearmstr Bob Armstrong added a comment - Looks good.

            Thanks rearmstr. I ran every combination of Jenkins and it passed all it currently can, i.e. through ci_hsc on all py2 os' (centos6&7 and OS X), but only lsst_distrib on py3 (since ci_hsc hasn't been py3'd yet).

            lauren Lauren MacArthur added a comment - Thanks rearmstr . I ran every combination of Jenkins and it passed all it currently can, i.e. through ci_hsc on all py2 os' (centos6&7 and OS X), but only lsst_distrib on py3 (since ci_hsc hasn't been py3'd yet).

            People

              rearmstr Bob Armstrong
              lauren Lauren MacArthur
              Bob Armstrong
              Bob Armstrong, John Swinbank, Lauren MacArthur
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                Updated:
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