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Hello, The short story is, my house location isnt't good for astrophotography, there isn't much I can do from my backyard but on the front and sides of the house where I'd have a better FOV I would have power lines running through most of my shots hence the question in the title. Would it be possible to remove them in processing ? |
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| Because your target will be moving with respect to the position of the power lines in each frame I would have thought you may be able to use a rejection algorithm in stacking to reject the power lines - much as you would for satellite trails. That said, I have never tried this! |
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| If you can see them in your images (do you?) then the answer is no, you can't. |
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Not sure with PI, but with PS it's ease. Just use one of the tool options, spot healing brush/healing brush/remove tool, or the clone stamp tool with a small brush size and pixel size. That is if you see them. |
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| I don't know if I see them because I havent tried yet. Tonight will be my first usable night since November, I didn't want to risk wasting it but I will give a try. I will have to sooner or later so I might as well do it now. |
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| If you do see them and they don't come out in calibration, just bring your stacked color image into photoshop and use one of those tools. May take some trial and error but should work. |
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Sooooooo. I can't show it here because I was using the asiair preview mode and I forgot to save a copy before unplugging everything but I do see the lines. In fact they are huge in the shots. There is no way they can be removed. I should have tried before asking here. I didn't expect them to be so big because I forgot to consider the zooming factor of the 135mm lens. This was so obvious.....I do feel kinda stupid now. |
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Eric Gagne: Do you have some example frames, preferably sampled from the beginning, middle and end of your imaging sequence? Power lines wouldn't be static within your frames. Because you would normally be tracking (there might be a few edge cases where you would not), the power lines should actually move from frame to frame. With that movement should come the ability to statistically identify them and eliminate them, at least hopefully. It would depend on how much they move frame to frame. With dithering they should move more and more randomly, which could help eliminate them. Mainly, if the power lines can be identified within each frame as "outliers" (well beyond some statistical mean) for most of the pixel values across all your frames, then they can be statistically "rejected" as part of image integration. That would be the easiest way to take care of them, if you can. If they cannot be identified and rejected statistically, then you might have to get more clever with their removal. If they are very out of focus and blurred, then in a sense they could be considered an aspect of the overall LP gradient. PixInsight just received a new type of gradient removal tool, that might be of some use here. Since it identifies and rejects larger-scale factors, a localized gradient caused by some OOF power lines might be identified and eliminated. |
