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In page Optical music recognition:
"Optical music recognition is frequently underestimated due to the seemingly easy nature of the problem: If provided with a perfect scan of typeset music, the visual recognition can be solved with a sequence of fairly simple algorithms, such as projections and template matching. However, the process gets significantly harder for poor scans or handwritten music, which many systems fail to recognize altogether. And even if all symbols would have been detected perfectly, it is still challenging to recover the musical semantics due to ambiguities and frequent violations of the rules of music notation (see the example of Chopin’s Nocturne). Donald Byrd and Jakob Simonsen argue that OMR is difficult because modern music notation is extremely complex.[1]
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