EoRImaging / FHD

Fast Holographic Deconvolution
BSD 2-Clause "Simplified" License
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Adding robust filter #271

Closed nicholebarry closed 2 years ago

nicholebarry commented 2 years ago

This is an implementation of robust/Briggs weighting for images, where robust_param is used to encode the robust scaling. It ranges from -2 to 2, where -2 is close to uniform weighting and 2 is close to natural weighting. Below are simulations of point sources in dirty Stokes I for robust weightings of -2, -1, 0, 1, and 2 (no noise).

Here is a locked DS9 tiled image:

Screen Shot 2021-09-30 at 2 14 04 pm

And again, oversaturated

Screen Shot 2021-09-30 at 2 13 33 pm

And a gif of the automatically made FHD images image

The extreme ends look correct (-2 ~ uniform, 2 ~ natural), but I have no frame of reference for in-between values. It would be great if someone experienced in what robust weighting looks like could advise if this is the normal behaviour.