Abstract: In this talk, I will present Bluebild, an
efficient algorithm to reconstruct continuous sky images directly on
the celestial sphere. The basic idea leverages an analytic,
operator-based framework to produce continuous images that can be
sampled up to the fundamental limit of the telescope. Unlike
discrete-based methods, it produces an accurate least-square estimate
of the underlying sky. Moreover, images are split in a multi-scale
energy decomposition to give many different viewpoints. Bluebild is
fast and easily parallelisable, and images can be shown in real-time
as observations progress. I will then introduce a form of beamforming
especially suited for improve accuracy while reducing data flow in
ASKAP.
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