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This apparently does exist and is called OMR(Optical Music Recognition) software
It exists, but every bit of software I've tried has incredibly poor performance on anything except the absolute cleanest typset printed pieces.
I wonder if an AI can do that? It's obsoleted LeafSnap.
just tried with the free version of claude. It works a lot better than anything else I've tried but it's not perfect, averaging ~2 mistakes per 10 bars for a relatively simple score.
Seems strange that it's so hard to get right. I guess it's a bit like reading handwriting - subtle tiny differences?
Does it give you a midi file from a scanned musical piece?
It outputs ABC notation, not midi. MIDI isn't really the right format for sheet music.
Wikipedia has a section on how it works and at least to some degree also why it's hard: https://en.wikipedia.org/wiki/Optical_music_recognition#Approaches_to_OMR