Hey there, I wasn't sure where to ask this question, maybe there is somewhere more appropriate?
Anyways, I have transferred some old super 8 film footage to HD. Everything looks great as it was shot. However, some footage has what appears as maybe a smudge or dirt that is on the lens. Actually it's all over the lens, like a soft bubbly blobby pattern. For the most part, especially if the camera is moving and it isn't too bright a scene then it isn't that noticeable. They are most apparent when looking at a sky or any plain uniform surface. Also, the pattern doesn't change.
I've dealt with this before with some success of applying an inverted monochromatic image of a still frame of the blob/dirt pattern, but in this case, there is never a perfect shot of solid color that I could use or easily assemble.
Here's my big dream filter.
Has anyone heard of software or technology that can review X amount of footage (with the fixed pattern of dirt artifacts) and calculate a clean plate to be used to remove these artifacts?
I know this is a long long shot, and it may be more of an academic endeavor. Maybe I need to go to a different forum.
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For simple things, like a dust spot on the lens or a hair in the film gate in the camera or transfer machine, you can use Delogo. Here's a tutorial I produced showing how to remove a simple sensor dust spot on a video taken with a digital SLR camera:
Tutorial on Delogo Filter for Virtualdub
You need to provide a sample of what you are trying to fix, but if it is a smudge, like a greasy fingerprint on the lens, I think you are totally out of luck. The reason I say this is that the result of such a smudge is very likely too large to be replaced by using adjacent pixels (which is what Delogo does), and it is almost the equivalent of an out-of-focus video, for which no fix exists.
Last edited by johnmeyer; 29th Jun 2020 at 19:20. Reason: typo
For large solid spots you could make a map of what never changes over several shots. But you will still have to infill.
Last edited by jagabo; 30th Jun 2020 at 07:37.
Thanks for all the replies!
johnmeyer's DeLogo at first look at the interface looked promising. However, as you mention it isn't effective with large greasy fingerprint spots. Which I would say is the case with my footage, except maybe more than several finger spots or whatever they are.
jagabo's solution of separate masks based on the 'clean plates' I can locate thru the entire video is probably the best I can do at the moment. Unfortunately, I cannot assemble the partial plates to one single image, since each 'clean plate' has varying existing gradients or slight textures, cloud wisps, its all imperfect, but likely better than nothing.
I would still love to hear if there are other people's solutions. Thank you.