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DBE with axial symmetry?

Andrew Lecher
in PixInsight
I have some data collects where the focuser tube moved side-to-side after meridian flip.  After flat-field calibration, the images exhibit a symmetrical, circular pattern, but one side is darker and other is lighter.  

Is this a candidate for using DBE correction with axial symmetry perhaps using Adam's method with some modification?  

What I've tried so far, is using fixed values in an axial manner (as in the DBE workflow video), but one side is gets corrected correctly and the other side either over/under corrected depending values used.  It's like I need the axial symmetry, but only apply the correction on half the image.

Comments

  • BlockHeadBlockHead
    Yeah... sorry, I don't think that is going to work. You have symmetry breaking there. :)
    I fear you really will need to attack  with lots of samples. I suspect the original problem is that your flat field image isn't matching up with the image illumination- causing the bright one side and dark other side. 

    The best fix is creating matching flats. But... hopefully DBE can help you.
    -the Blockhead
  • Andrew Lecher
    I ended up leveraging the processes from your "DBE_Small_Scale" video where you had to deal with the bright "X" in the image.  Lots of samples with adjustments for tolerance, shadows relaxation and smoothing factor.  Took some trial and error, but it looks like I'll be able to "save" hours of data that may have been otherwise unusable. 
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