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DM-55328: Write a difference image deblender - #478

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isullivan wants to merge 14 commits into
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tickets/DM-55328
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isullivan wants to merge 14 commits into
mainfrom
tickets/DM-55328

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@isullivan

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Peaks within detected footprints are clustered, and then the clusters are tested with a gaussian mixture model to allow artifacts around bright stars to be pulled into the central cluster. A test is applied to linear features to catch and keep long trailed sources together in the same footprint.

Cluster detected peaks by single-linkage on their positions, ignoring
polarity so dipole lobes group together. Isolated positive peaks can then
be extracted as their own diaSources.
Extract isolated positive peaks out of multi-peak footprints into new
footprints, leaving the remainder on the original source.
Drop the SourceDeblendTask subtask and deblend merged footprints by
extracting isolated positive peaks, flagging affected records is_deblended.
Use a smaller check on the actual size of the footprint spans, and a larger limit on the enclosing bbox.
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