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  1. Data Management
  2. DM-10332

Test deblender with exact positions

    Details

    • Type: Story
    • Status: Done
    • Resolution: Done
    • Fix Version/s: None
    • Component/s: meas_deblender
    • Labels:
      None

      Description

      Peter Melchior and I believe that the main failure of the current deblender is due to the difference between a sources peak position and its integer position in the pixel grid, which causes the symmetry operator to fail. In DM-10189 we created a translation operator that can shift the position of the peak to a fractional position and before we implement a solution to fit this position (DM-10310) it will be advantageous to check use the exact position (known in a simulated image) and see if this resolves the problem.

      There is no reason to proceed with DM-10310 until we are sure that better positions and the translation operator will improve the deblender performance.

      Since this ticket requires re-writing the functions that calculate the likelihood, this will also include updating the intensity matrix ({S}} in the NMF code) so that each source is in the center pixel. This suggestion by Jim Bosch allows each source to use the same monotonicity and symmetry operators, whose calculation were one of the more time consuming parts of the new deblender. It should also make optimization easier once parts of the code are ported to C++.

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            fred3m Fred Moolekamp added a comment -

            Hi Peter, do you mind reviewing the ticket for using exact positions?

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            fred3m Fred Moolekamp added a comment - Hi Peter, do you mind reviewing the ticket for using exact positions?
            Hide
            pmelchior Peter Melchior added a comment -

            works as advertised

            Show
            pmelchior Peter Melchior added a comment - works as advertised

              People

              • Assignee:
                fred3m Fred Moolekamp
                Reporter:
                fred3m Fred Moolekamp
                Reviewers:
                Peter Melchior
                Watchers:
                Fred Moolekamp, Peter Melchior
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                • Created:
                  Updated:
                  Resolved:

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