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astro-informatics / purify

Next-generation radio interferometric imaging.
https://astro-informatics.github.io/purify
GNU General Public License v2.0
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How to suppress wave around point source and some extended noise on the background? #270

Open castleKing1997 opened 5 years ago

castleKing1997 commented 5 years ago

I got better result with a smaller value of measurements_sigma. But the result is till not so good. There are some wave structure around point source and some extended noise on the background. I have uploaded the images here. Is there till any parameter needed updating in the configure file?

Luke-Pratley commented 5 years ago

It looks like the measurements_sigma might be too small and it could be over fitting. There might be errors that are at the noise level you are trying to image at.

With the last release the measurements_sigma value has not been using the correct units of Jy, so it is hard to set. This should be fixed in the next release, but I have been held since I just handed in my PhD Thesis. Sorry!

You might get a bit better results if you have relVarianceConvergence: 1e-3 change to relVarianceConvergence: 1e-4.

Also, maybe you don't need the wide-field imaging algorithms on if you don't have a big w term?