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An experiment in super-resolution, part 2

Image

Expand image

About this observation
Observer
Paul Leyland
Time of observation
11/11/2018 - 01:55
Object
ES 1128
Observing location
Tacande Observatory
Equipment
0.4m Dilworth-Relay
SBIG-8 with AO-7 autoguider
No filter
Exposure
75 seconds in four subs of 5, 10, 20, 40s

https://britastro.org/node/19348 shows my first, quick, and dirty attempt at super-resolution.  Since then I've implemented the CLEAN deconvolution algorithm.  See https://en.wikipedia.org/wiki/CLEAN_(algorithm) for an introduction and links to further reading.  2000 iterations with a gain of 0.1, followed by a 2-pixel radius Gaussian blur of the CLEAN map and the re-addition of the residuals produced the image above.

It's markedly better than the Richardson-Lucy reconstruction produced earlier, even though it started with exactly the same raw image and PSF.  The signal to noise ratio is much better, the limiting magnitude is better and there is clear sky between the components of the double star.

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