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Effective Image Differencing with ConvNets for Real-time Transient Hunting

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arxiv 1710.01422 v1 pith:E7YQA3ZJ submitted 2017-10-04 astro-ph.IM cs.CV

classification astro-ph.IMcs.CV
keywords imagesubtractionreal-timetransientartifactsdetectiondifferencingfast
verification ladder T0 review T1 audit T2 compute T3 formal
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Large sky surveys are increasingly relying on image subtraction pipelines for real-time (and archival) transient detection. In this process one has to contend with varying PSF, small brightness variations in many sources, as well as artifacts resulting from saturated stars, and, in general, matching errors. Very often the differencing is done with a reference image that is deeper than individual images and the attendant difference in noise characteristics can also lead to artifacts. We present here a deep-learning approach to transient detection that encapsulates all the steps of a traditional image subtraction pipeline -- image registration, background subtraction, noise removal, psf matching, and subtraction -- into a single real-time convolutional network. Once trained the method works lighteningly fast, and given that it does multiple steps at one go, the advantages for multi-CCD, fast surveys like ZTF and LSST are obvious.

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  1. The classification of real and bogus transients using active learning and semi-supervised learning

    astro-ph.IM 2024-12 conditional novelty 4.0 of 10

    RB-C1000, a pipeline combining active learning and semi-supervised pseudo-labeling, achieves roughly 98.8% real/bogus classification accuracy on new ZTF datasets using only 1,000 labels.

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