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Thread: A new technique for enhancing image detail

  1. #1
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    Default A new technique for enhancing image detail



    Hi all,
    I've been developing a new method, using the Sobel Operator, to bring-out image detail, I have done a quick-'n-dirty How-To video:vimeo.com/314357401.

    By the way, as far as I can tell, only PI has the necessary implementation of the Sobel Operator. If some other pgm does too, let me know, please.

    I also have a couple more example, posted on astrobin:
    astrobin.com/388624
    astrobin.com/388653

    Suggestion? Comments? Questions? just let me know!

    Alex

    P.S. The constant comment that PI is difficult to learn is just not true. I had at least as much struggle learning CS6 as I did with PI. I now use both, but PI is where the heavy lifting is done with the most rigorous and modern algorithms, tailored to astro-images. CS6 adds some frills, when I want them.
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    Default Re: A new technique for enhancing image detail

    Hey Alex,
    Interesting idea. I hadn't heard of that operator before. I'll study your video later and get back to you.
    Stu
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    Default Re: A new technique for enhancing image detail

    I will research this S. operator, not so sure how this works. But PI is not easy because that is the common and usual impression. PI has a different interface which is different and not intuitive. It has no manual which should not occur if you pay so much for it. Imagine buying a camera without a manual etc. I got stuck with DBE and found it did not work well with some images. ABE did not work so well either - nothing about how to adjust parameters. I don't want to drain money++ to 3rd party websites. I think it should be free.
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    Default Re: A new technique for enhancing image detail

    The Sobel operator is in the AIP4WIN software too, and it's briefly discussed in the book. Wiki being what it is nowadays, it's got a more detailed description!

    The Handbook of Astronomical Image Processing with AIP4Win Software by Richard Berry and James Burnell
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    Default Re: A new technique for enhancing image detail

    Interesting Alex.
    It looks like:
    1) You are taking the first derivative of the image in all four directions.
    2) Combining the four derivative images in various ways.
    3) Using these combined images either as Luminance or to simply modulate the RGB image?

    I think!?!

    You seem to have a good feel for this process. I have to admit it looks rather intimidating to me. I was hoping to see a complete flow of how to use it, but, didn't come away feeling that was done.

    All that said, a couple of your finished examples showed amazing details that were not at all evident from the normal processing.

    Thanks for sharing. Hope I have the guts to give it a try.

    Steve
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    Default Re: A new technique for enhancing image detail

    Thanks for the comments. I'm still working the details of the "best" approach to implementing it. Steve, yes you have the idea. I take the four directions, combine using
    ( (max(W, ~E))^2 + (max(N, ~S))^2 )*.5 . That's my current method...nothing rigorous underpinning the approach, I'm afraid.

    Alex
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