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  1. Data Management
  2. DM-8831

Investigate using NMF for deblender

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

      Peter Melchior proposed using a non-negative matrix factorization (NMF) technique for deblending footprints by estimating SED's for the various galaxies. Through the conversation we outlined an algorithm to implement for the multi-color deblender that adds the constraint of symmetry from the SDSS deblender. This ticket involves reading the literature on NMF, developing the algorithm, and having it evaluated by others.

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            fred3m Fred Moolekamp added a comment -

            Based on a discussion from last week, it appears that NMF may solve some of our problems (in instances where the blended sources have different colors) but will not (likely) help in monochromatic galaxy clusters (where the sources all have nearly the same colors).

            However, the plugins for a multi-color deblender using NMF and those for another system (like the current SDSS deblender but with some form of color information added) will look very different, so Bob Armstrong and I agreed that it is best to further investigate the utility of using NMF to deblend footprint and compare that to the current deblender. A new ticket will be opened to code the NMF algorithm and test it against the current deblender.

            Show
            fred3m Fred Moolekamp added a comment - Based on a discussion from last week, it appears that NMF may solve some of our problems (in instances where the blended sources have different colors) but will not (likely) help in monochromatic galaxy clusters (where the sources all have nearly the same colors). However, the plugins for a multi-color deblender using NMF and those for another system (like the current SDSS deblender but with some form of color information added) will look very different, so Bob Armstrong and I agreed that it is best to further investigate the utility of using NMF to deblend footprint and compare that to the current deblender. A new ticket will be opened to code the NMF algorithm and test it against the current deblender.
            Hide
            fred3m Fred Moolekamp added a comment -

            Created DM-8959 To create an NMF plugin.

            Show
            fred3m Fred Moolekamp added a comment - Created DM-8959 To create an NMF plugin.

              People

              • Assignee:
                fred3m Fred Moolekamp
                Reporter:
                fred3m Fred Moolekamp
                Watchers:
                Fred Moolekamp
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