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After many hours of fiddling round with Registax wavelet settings to process my own solar system images, I've always been curious as to how it actually works. In doing so I've put together my own image sharpening program which does something similar to Registax wavelets. For comparison, I've also added some general purpose deconvolution techniques which you'll probably be familiar with from other image processing software (like Wiener inverse filtering, Richardson-Lucy, etc). In choosing a point spread function to deconvolve with, one suprising result was that the typical stack outputs from Autostakkert work best with a Lorentz point spread function (with a minor modification). Deconvolving with a Gaussian point spread function doesn't really work. Deep-sky images seem to deconvolve best with a Moffat point spread function (which is to be expected - it's already well established that star profiles in long exposures are best approximated with a Moffat function).
On the whole, it's unlikely that you can sharpen solar system images much more in this program than you already can in Registax. You can see results from Registax wavelet (sharpening layers), inverse filtering (e.g. Wiener), and iterative deconvolution (e.g. Landweber) below. They all give very similar results. In all the techniques there's a similar trade-off between less noise but less detail vs more noise but more detail.
There are some quick start notes on the first page of the Readme here:
There are some examples of deconvolved images here (move mouse over image to see before/after):
Image credits are on the hyperlinks
The Windows download is here:
Example solar system tifs to experiment with are here:
And the project page is here (with Source code in the src folder)
If anyone finds it useful, do post here how it compares to other tools you use for solar system image sharpening.
The download and the source code are free, you can use it unrestricted for any purpose. The OpenCV and OpenCVCSharp components which my program use have licence information at the end of the Readme.pdf.
Just bought a Bresser 8 inch Dob and a BST star guider 8mm eyepiece. This will sound stupid, but will the telescope come with dust caps?By OptymsticAlpaca
Also, are there any other accessories that would be a good idea to get? I already have a few astronomy books.
I’m completely new to Astrophotography and am just in the process of choosing my new rig.
does anyone living locally in Hertfordshire have any recommendations for the best areas with the least light pollution around Hemel Hempstead way?
I’m thinking Ashridge / Ivanhoe so it gets you high enough so leave the worse of light pollution behind - I tried taking some shots from my back garden and it was just consumed by yellow colour cast 😩
Any ideas I would grateful - found a thread on Hertfordshire skies but it favoured towards the east of Hertfordshire whereas I’m more West way.
I currently have a Canon T6 with a Opteka 500mm f8 lens ($87) that I use for lunar and solar photography. I recently purchased a full frame Canon EOS R and am thinking about getting a 800mm f11 Canon RF lens ($899). Will the quality on the new canon lens be significantly better than my Opteka lens? Is it worth the upgrade? Also, should I use my new full frame or my crop sensor (1.6 factor) to shoot? I want to get the best quality possible.
I am thinking about buying a Celestron Nexstar 6se to use for astrophotography at a very beginner level. I am thinking about using a ZWO ASI224MC as it seems a good option. I have a few questions about how to setup/use it - here they are:
1.) Do you just screw it on where the eyepiece is usually at?
2.) Do you just have the cable going to a computer where you have stacking spect where that stacks the photos it takes?
3.) Does it automatically take photos of planets and DSO’s?
4.) Does it need any filters to get color on nebulae as those are they primary things I want to photograph
Thats all, as you can see I am a beginner to astrophotography and just want to know how to use the camera to take decent pictures.