[MEI-L] Tools/libraries to find staves in scanned sheet music

[Urs Liska]

Hi Johannes

Am Donnerstag, den 30.04.2020, 09:57 +0200 schrieb Johannes Kepper:
> Hi Urs,
> 
> you could use the Measure Detector (
> https://measure-detector.edirom.de/), 

Thank you for this link.

> which automatically generates an MEI file with measure positions. You
> may preview those boxes by clicking on a file name after the file has
> been recognized. 

This is obviously a great tool that will help me to (maybe finally)
implement a long-standing wish of mine for pimping up the Frescobaldi
manuscript viewer (
https://github.com/frescobaldi/frescobaldi/issues/923#issuecomment-621697927
).

> However, it doesn't tell you how many staves will need to go in
> there, so this approach needs some more steps in a toolchain before
> you get your results, 

I have the impression that the tool is focused on something else, and I
don't know whether  it is worth exploring it in the direction I need
(especially because I'm sure there are other existing tools that *do*
look for the same thing I do).

What I need is the exact position of all the stafflines to overlay
generated stafflines. Eventually you should be able to switch/blend
between empty staves, original score and hopefully a score completed by
the teacher/students.


> but they will depend on your preferred tools and so on. I'm sure
> other approaches are equally possible… 

The preferred tools are not the most important part. Having an MEI file
like the one from the measure-detector would surely be a good starting
point for arbitrary tools.

Best
Urs

> 
> All best,
> jo
> 
> > Am 30.04.2020 um 09:41 schrieb Urs Liska <ul at openlilylib.org>:
> > 
> > Dear MEI,
> > 
> > I am investigating ways to produce empty staves/barlines to overlay
> > over scanned sheet music. The use case is creating teaching/testing
> > sheets for music theory and aural training classes (so the target
> > repertoire would be mostly common western notation).
> > 
> > My first approach was to create a Scribus script that draws staff-
> > and
> > barlines from rectangles that have been drawn over the systems.
> > While
> > this works surprisingly well it is still a tedious work for longer
> > and
> > full scores.
> > 
> > AFAIK the detection of staff- and barlines is basically a solved
> > challenge in OMR. Could somebody point me towards the potentially
> > easiest approach I should explore? Algorithms, libraries, ready-to-
> > use
> > tools?
> > 
> > What I need is something that analyses (multipage) sheet music from
> > image or PDF files and produces a structured text file with all the
> > relevant coordinates, or anything from which I can instruct some
> > tool
> > (whether Inkscape, Scribus, LilyPond or whatever) to generate the
> > empty
> > sheet music to overlay over the scanned score.
> > 
> > Thank you for any pointers
> > Urs
> > 
> > PS: Do you agree with me that trying to somehow *remove* the
> > musical
> > content from a scanned image is a much less promising approach?
> > 
> > 
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