In the morning a group of us (Fergus, Schölkopf, Hirsch, Harmeling, myself) worked on the idea that Hirsch et al's lucky image deconvolution system could be used to combine and model any multi-exposure imaging. The system seems to work on pretty-much anything (as it should), although there are knobs to turn when it comes to engineering aspects (as in: batch vs online, how to initialize, multiplicative or additive update steps, parameterization of the image plane, etc). In the afternoon, Hirsch, Harmeling, and I specified the content of a publishable (in astronomy) paper making that point, with explicit demonstration of applicability to PanSTARRS, DES, and LSST. We spent a long time talking about what is the most assumption-free kind of model; Harmeling likes grids of pixels as models; I like grids of pixels plus floating Gaussians or delta-functions.
I also gave an informal seminar about work by Lang and me on Astrometry.net, web 2.0 stuff, the Open-Source Sky Survey, the Tractor, and other vapor-ware.
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