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Is there any way to save storage on similar images? (lemmy.pe1uca.dev)

submitted 2 months ago by [email protected] to c/[email protected]

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So, I'm selfhosting immich, the issue is we tend to take a lot of pictures of the same scene/thing to later pick the best, and well, we can have 5~10 photos which are basically duplicates but not quite.
Some duplicate finding programs put those images at 95% or more similarity.

I'm wondering if there's any way, probably at file system level, for the same images to be compressed together.
Maybe deduplication?
Have any of you guys handled a similar situation?

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[–] [email protected] 0 points 2 months ago* (last edited 2 months ago)

Yeah. I understand. But first you have to cluster your images so you know which ones are similar and can then do the deduplication. This would be a powerful way to do that. It's just expensive compared to other clustering algorithms.

My point in linking the paper is that "the probe" you suggested is a 20 year old metric that is well understood. Using normalized compression distance as a measure of Kolmogorov Complexity is what the linked paper is about. You don't need to spend time showing similar images will compress more than dissimilar ones. The compression length is itself a measure of similarity.