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MURE denoise in CMOS

Kristi Kuenstler
in PixInsight
So I was just listening to recent Adam Block discussion of MURE denoise on recent narrowband videos and he said it doesn't play well with CMOS cameras. I have been struggling with this FOREVER! I am running an ASI 6200. MURE denoise looks great right after you do it. But as soon as you run DBE the images look atrocious. Like unusable!  So after hearing Adam say that I went back on the pics I was processing and undid MURE and reran DBE and images look fine again. I had been thinking I was screwing up DBE somehow but I think it's the MURE. So my question is, what routine is best to run for denoise with a CMOS and at what point in the process?

Comments

  • BlockHeadBlockHead
    Just to be clear- DBE isn't doing anything to make things worse...it is just allowing you to see the issue more easily by making the background more uniform. Typically this more uniform background comes with a greater stretch... with more contrast so you can see more stuff. This is GOOD for faint stuff. This is BAD for noise stuff.

    Concerning when to do the noise reduction- it depends on this and that. I just don't think there is a good general answer. It depends on your data, on the object- is the noise mostly in color or luminance? All kinds of stuff it depends. I can certainly say things like TGVDenoise a little in the linear state- more maybe MLT with the removal of layer 1 ... perhaps with a light mask... but I always fear that people walk away with a recipe that simply will not work in general. 

    I think the better approach is to look at the noise and decide if it needs to be tamed early on. If you will be brightening the image aggressively later because the subject is faint you KNOW the noise will only be brightened so incrementally doing something while linear is a good idea. But what if the noise looks OK at the moment in linear and the object is bright? Then it is better to wait to tackle it when you can see it more easily in the stretched stages. 

    Anyway..those are my morning thoughts...

    -the Blockhead
  • Kristi Kuenstler
    Thank You!

  • Euripides
    As soon as WBPP included the ability to create R,G,B output files, I gave a try to Mure and it works fine for me.

    You certainly have to find your parameters, for example on the G I have to decrease the Variance Scale even to 0.3 to have a good output, while on R I go up to 0.8.

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