ratt-ru / bullseye

A GPU-based facet imager
GNU General Public License v2.0
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Fix Normalization issue #35

Closed bennahugo closed 9 years ago

bennahugo commented 9 years ago

Investigating.. probably need to normalize convolution weights...

bennahugo commented 9 years ago

Yup... so far I've come across three causes: the convolution function must integrate to unity, I didn't normalize the IFFT by N^2 and i forgot the channel averaging term. We still have a factor depending on the number rows it seems.

cyriltasse commented 9 years ago

I went into those troubles too! I think you should devide by the (i) support of the CF (ii) the N**2, and (iii) the sum of the weights (which is the number of visibilities if the weight is one for each visibility).

bennahugo commented 9 years ago

Thanks cyril will check that one out.

o-smirnov commented 9 years ago

Cool, so are you getting "identical" results to lwimager now?