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

[Thomas Weber]

SharpEye has a text output format which gives the staff positions quite precisely – at least if there is no rotation of the page involved (which is a requirement for your use case anyway).  But the output format is not very well documented.


Am 30.04.20 um 10:45 schrieb 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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